Fantastic..... I'm a bit further down the road with my, almost identical build. If ever the phrases, "the Devil is in the detail" and "planning is everything" come to the fore...... this is it...... So many peeps in the trade can't get their heads around this.....
Trade just haven't spent enough time figuring out what works well and what doesn't work well with warm roofs. They will get there, but it's early days. So good to see Robin sharing his ideas for how to do it well. The energy efficiency of the finished home is well worth the ttime spent getting the design right.
@@andrewpritchard5328 In the Military It was the 7P`s = "Perfect - Pre - Planning - Prevents - Piss -Poor -Performance." and if you failed at a task it was the 4 F`s = "Found it, Flaked it, Failed it, Fuck it." 👍🤔
Any thing to think about if mounting PV on a warm roof? Can you do a vid on the fixings that go through the external rafters? Calculating the spacings, the length, the angle they're inserted, figuring out the local wind factors...?
Really enjoy your videos, it's great from an architects point of view to see someone who is great at what they do and highlights where buildability issues crop up - super useful as it's hard to predict these issues on a drawing board.
Robin love the video, amazing craftsmanship detail detail detail love it, but how on earth do you even price a job this size, a video on how you price a job like this would be beneficial, amazing 👍💪
I would class this as a Hybrid roof because you have introduced a ventilation on top of the insulation, a warm roof for me is when the finish product is fitted directly to the insulation.
@@davidscott3292 It can be done, with the primary battens nailed through the insulation. One must be mindful of the fixing detail as the 150mm insulation doesn't really 'support' the fixing so the weight of the tiles and wind uplift calcs must be considered.
Great to see quality work with well thought out detail. Keep posting these informative and knowledgeable vids. I’m sure younger people entering the trade benefit from your years of experience. Devil is in the details! Unfortunately customers are sometime persuaded that Price is the crucial element. Quality work, strong detailing lasts longer and is more efficient over time. 👏
Robin that's great work pir is a hard material to get precise so many don't but that must have been an impossible job to price measuring cutting fitting tapig and then battons hope whoever lives there appreciated the detail
Wonderful to see and thank you for sharing. My only gripe is that the dormers are being done as a cold roof, which is a shame given the insulation levels to the rest of the roof, but it certainly doesn't detract from the precision work you have here, it's great to see!
Another great video Robin. If only we could clone you a few thousand times we'd have a chance of the new builds lasting something like the length of time the Victorians expected and also only costing a few hundred pounds a year to heat. Every job I do I find myself asking, how would Robin do this ? Bravo Robin and keep up the great work.
I'm a bit of a fanatic too. A building control officer said to me once, "come on we're not building a spaceship". We I think we are now..! Every insulation,and membrane manufacturers specification are different.... Easy to get headaches these days
Outstanding! Congratulations on your success. In my opinion that is a world leading structure. In your follow up video could you go into the cross flow ventilation to the rafter. You mentioned an over fascia vent which i imagine is purely for the counter lath. Your soffit i imagine is going to be vented on the eaves and you have a detail in the ridge to complete the ventilation down to the rafter.
A master piece of a structure. Well done Robin.I believe you should express all your lineal dimensions,in it's imperial equivalent for the benefit of USA subscribers.
Great video, as usual. I’d love to see Robin move more into the biobased sphere. By now we all know the benefits of phase shifting, thermal inertia, etc, that PIR lacks. And the circularity that is lacking here. With such a craftsman at work, Robs efforts would be put to better use, making better buildings. If only the designer and client and material supplier would take the same fanatical approach, it would yield so much more. Come on Rob! Expand into real green building, it’s an exiting field with so much development still going on and innovation at much higher pace than the regular building practices.
Kinda strange seal everything up ,warm roof then go and add cold air albeit above insulation ,cold side it’s all getting a mine field to understand but great work as always
Hi Robin. I hope you registered the IP for the attachment for the ISC240. Then you can sell the license to Festool. Should be pretty easy to manufacture out of plastic/metal plate, but I would leave them to figure that out and just get them to pay you a license for each one sold. Easy money. Might not be as much as manufactoring it yourself but the pennies add up to pounds.
Excellent insulation values, though missing a key component for the envelope, vapor diffusion. Typically in cooler climate zones vapor pressure drive is outward. The interior OSB is enough of a vapor restrictor to inhibit this outward drive. The foil faced exterior is a vapor barrier on the wrong side, inhibiting outward vapor diffusive drying. And does very little to control heat transfer. Cold climate research shows the exterior radiant barrier only reduces heat transfer by 2%, though blocks vapor on the cold side. More important to stop air flow with continuous membranes that are permeable and liquid water tight.
Lovely work again Robin. Lots of work to do from the looks of it, how many guys would you have working with you on the joinery on a job like this? Thanks
Beautiful work! Shame to cover it up with the plasterboard and tiles 😂 Have a look into types of roofing underlays (LR, HR and Vapour permeable membrane which is commonly referred to as breather membrane). Will help clarify the requirements for ventilation (under membrane or under roof covering) and best way to install (onto insulation or above counterbattens). Membrane manufacturers such as Proctor have online webinars to help explain.
Robin, With a tight house like this, will a heat exchanger ventilation unit be installed? Thanks for the videos, I am not in the business but I still enjoy watching any master practice his craft. Plus, you seem like a nice guy.
Thing of beauty. So nice to not see steel in the two roofs I’ve seen you do on RUclips. I’ve tried to convince two contractors I work with to investigate your method and they’ve dismissed it as too expensive. Wonder what your response to that would be.
@@ukconstruction Simple for someone like your self but unfortunately I've never seen anything close to your stuff when I have a nosey at local roofing works. A breakdown of the costs when it's completed would be very interesting 👌
Actually just did a bit of searching and you can get an eaves closure piece that fits under the GRP valley at eaves level, looks very neat but like most things it might be a bugger to fit in real life.
I contacted building control to ask what my local regulations are (as I moved up the other end of the country) I was told work done would need to be to the Building Regulations 2010 as would be applicable anyway in the England.
Hi Robin, beautiful work as ever! I have a 50 degree pitched warm roof to insulate and wondered how you calculate your hip and valley compound cut angles?
Your parietooccipital cortex should have been working 24/7 on this project. What an inspirational dedication. BTW, what about chimneys? None in the project?
Any thing to think about if mounting PV on a warm roof? Do the fixings need to go through to the internal rafters? Can you do a general vid on the fixings that go through the insulation rafters? Calculating the spacings, the length, the angle they're inserted, figuring out the local wind factors...?
I’m assuming the rows of PIR aren’t glued / foamed to each other, with just seam taping outside won’t you get a slim cold spot at the joints that will be a condensation point for any vapour that works through?
We fit these tight together and the gap is minute as we are simply laying straight in a brick format, it is key that you start dead straight and parallel to the ridge!!
Great video. We were trying to look for information or videos on warm roof construction and couldn’t find anything as comprehensive as this. In the end we went for a standard between and under rafter method due to this lack of information. However, the main things that held us back are as follows: Are the fixings driven in perpendicular to the roof or at a 30 or 60 degree angle? Once the battens are on, can they still support the weight of people walking/working on the roof? What was the reason for opting for insulation over and between, why not just go over the rafters only? Could there not be problems with interstitial condensation affecting the rafters?
Somewhere in the system we have to have a cost/benefit discussion on residential insulation. Is all the costs of additional insulation worth it for the benefits which are measured in fractions of a watt. You would need scientific equipment to actually measure it. I doubt i would ever recoup these costs in lower bills. I am certainly not having a pop at you Robin, your work appears very high quality and I understand that you as a Tradesman follow the drawings as expediently as possible to make a living. Perhaps In a few years time i wont be able to enter my house because it is stuffed full of insulation and I have to sleep in the garage.. (I hope this is a joke..) More is not necessarily better.. 25mm of PIR does 80% of the insulating (From manufacturers blurb) The next 25mm adds another 5% diminishing..
Great video again Robin. I must admit I do miss your little music intro !! Because you have not used osb sheeting did you have to use more trusses ? Last time I did a roof the osb formed part of the loading specs etc so just wondered how this roof works specs wise thanks
Noce work looks much nicer thsn taking down lath and plaster and going home like a chimney sweep. Im thinking of looking into something like the hilti air cleaner to catch the airborne dust
Thanks for this detailed example, Robin, really appreciate the legwork you've done to make sense of the application spec differences. I've heard that PIR tends to shrink over time (due to things like off-gassing?). How is this accounted for in your 0.11 U value target & the design of the job? I've read about shrinkage anywhere between 1-2%.
The Use of Gapo Tape will allow for the minor shrinkage of PIR. Most boards by the time they make it onto site will have had enough time since manufacture to do any shrinkage or most of it, I have used some old stored sheets of PIR probably about 5 years old and they measured exactly 2400 by 1200 so no movement there, hope that helps
I notice you have diagonal braces to strengthen the roof. If you wanted to plasterboard the loft space, would it be safe to remove these or would it mean you need a rigid sarking? For example a layer of osb on top of the rafters before the top layer of insulation, similar to a warm flat roof construction and your gable ends?
Hi Robin, great video, been watching a few as looking at a build in future. Quick question of warm vs cold roofs - if identical 200mm total (2 x 100mm) pir was used between rafters and either above or below rafters depending on if warm/cold roof, is either better from a energy conservation standpoint. I was wondering if colder than air temps due to heat lost via radiation in night sky on exposed rafters vs covered insulated rafters alters anything or if it did wether it’s negligible. Cheers!
@Robin amazing work and attention to detail. The passion you have for your craft is so clear. I’m renovating my house, with a warm roof planned in, and I’m nearing the point where I need to find contractors (technical drawings nearly done). Based on your videos, my project probably doesn’t meet your minimum size requirements. Do you have any recommendations on how to find trustworthy tradespeople? I’ve been bitten a few times by the typical websites used to find trades people. What’s your thoughts on FMB for example?
I've been a subscriber for years now Robin, You're a Brilliant Chippie and (Nearly) always make very interesting video's .... But this whole Anal approach to Insulation by the Construction, Boat & Campervan Build - Plus! DIY Communities is bordering on a Mental Illness Pandemic .... Do You ever take a step back, look at the situation and THINK! - "Are We being 'Played' Here?" ..... Like 'Smart-Motorways' ... I think We ARE!! .........
There's no question at all that were being completely played with these crazy ridiculous regulations , I'm a contracts manager & we mostly do new builds for housing association & the specifications are quite stupid now & the cost has gotten way out of hand
How do the rafters dry out with with a vapour barrier above on the insulation and below on the plasterboard ? I appreciate this is the recommended method but it seems like ideal conditions for rot to set in.
Another universe compared to our 1970s bish bash bosh house, LBC Tudors laid frog down on weak mortar, no cavity wall insulation but loads of rubbish & mortar droppings, old tar roofing felt, paramount internal walls with the matching door linings/above door everglade glass panel. Rather have masonary over timbers & osb walls though, maybe a modern version of a cavity wall and then wet plastered/floated inside to prevent air leakage.
Scottish Building Regulations are already very different, but are changing again in January 2025, to full “Passive House” standard. Whether developer build, affordable homes or social housing.
@ukconstruction are you taking on the role of Principle Designer (under the BSA 2022) on projects like this? Seems you are making key decisions about how to comply with the B'Regs which would normally sit with the architect, but at no point mention them. I'm not saying that's incorrect, just curious as there has been a lot of confusion & mixed advice on how to navigate this new system post Oct 2023.
The house has a sweater. What I thought in the British climate zone, you would dry an envelope to the outside - given the exterior tight insulation, and a tight barrier material covering the interior wall, moisture is trapped.
Brilliant video on modern insulated homes. Some detail. Robin i see the counter batton at the ridge are staggered. So the rafter are not in the same line? As in spacings. From the front are different to the back if you understand me.
@ukconstruction thanks for the reply Robin . I understand now what you did. Brilliant video as always. I'm still waiting for the gazebo with the beautiful roof your going to cut. 👌🇮🇪
I would be very interested in the difference between this and the Gapotape you used on the big build as we have followed that route. Theis warm roof would not have worked for our project as the roof height would have needed to be higher. I wish our builder had your eye for precision as we had to remove all of the PIR he had installed and refit it to some sort of stnadard using gapotape.
I think it's all madness... the price of insulation is madness... no wonder people run out of money building houses its madness.. warm deck is too expensive...even pricing up all the extra sprockets and stuff and extra time is more money.... I have done gutex on top of rafters before which is woodfibre insulation from Germany that was 16years ago.. now I put 50mm pir full sheets across the under side of the rafter with 200mm of metac high density insulation between rafters and tape all the joints of the pir to have it air thight and counter batten then normal slabs... less hassle..
Hi Robin, I love your videos, you have tremendous skill and knowledge. I have planning permission to build a new house very similar to this one, just a bit bigger, particularly upstairs. I’m not a builder I’m a retired mechanic who has done various building projects. I have been researching Insulated Concrete Formwork for the walls because I could assemble the main structure myself with help from my son. There’s a company in Cornwall called R Wall, they make a very clever system. Also I’m thinking of using SIPs for the roof, I want to achieve Passivehous standards. Whilst the cost of materials may be more I think it would save a lot of labour, any thoughts on this system ? Thanks in advance.
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This isn’t building….. it’s engineering! Robin, you are a master and thank you for sharing your skills and expertise with us!
Good building incorporates good engineering and that is what is mostly missing in house building.
An absolutely fantastic Robin Clevett video. Such high quality information. Thanks
Robin's understatement of the week, "I'm a bit of a fanatic".
It says "chippy" on your back, but you are so much more. Exceptional work!
Fantastic..... I'm a bit further down the road with my, almost identical build. If ever the phrases, "the Devil is in the detail" and "planning is everything" come to the fore...... this is it...... So many peeps in the trade can't get their heads around this.....
Trade just haven't spent enough time figuring out what works well and what doesn't work well with warm roofs. They will get there, but it's early days. So good to see Robin sharing his ideas for how to do it well. The energy efficiency of the finished home is well worth the ttime spent getting the design right.
perfect planning prevents piss poor performance . The 6 P's
@@andrewpritchard5328 In the Military It was the 7P`s = "Perfect - Pre - Planning - Prevents - Piss -Poor -Performance."
and if you failed at a task it was the 4 F`s = "Found it, Flaked it, Failed it, Fuck it."
👍🤔
Any thing to think about if mounting PV on a warm roof?
Can you do a vid on the fixings that go through the external rafters? Calculating the spacings, the length, the angle they're inserted, figuring out the local wind factors...?
The quality on show here is legendary!
Amazing job Robin, Well Insulated roof once again, keep up the good work 👍😃
Thanks again!
You are incredible Robin. Outstanding work, as always!
That’s very impressive Robin. Really beautiful work, they’ll get the dividends back in the future when they rarely have to use the heating!
Really enjoy your videos, it's great from an architects point of view to see someone who is great at what they do and highlights where buildability issues crop up - super useful as it's hard to predict these issues on a drawing board.
Gosh 😅 this is Art !!!
I feel honoured to watch your videos, excellence and dedication!
Thank you so much 😀
Outstanding workmanship Robin, very thoughtful construction and detailing. I’d love a roof like that! 🙂
Thank you kindly
Some grilled chicken and watching the master at work! Life’s good !! 😂, absolutely incredible as usual! Well done rob .
Robin is a genius!
Robin love the video, amazing craftsmanship detail detail detail love it, but how on earth do you even price a job this size, a video on how you price a job like this would be beneficial, amazing 👍💪
Great point! will do a video in the future
I would class this as a Hybrid roof because you have introduced a ventilation on top of the insulation, a warm roof for me is when the finish product is fitted directly to the insulation.
Hybrid is where there is a gap between the cold insualtion and the warm risking interstitial condensation.
As I see it, a 'warm roof' would have all the insulation above the rafters. How you would/could do that I don't know.
@@davidscott3292 It can be done, with the primary battens nailed through the insulation. One must be mindful of the fixing detail as the 150mm insulation doesn't really 'support' the fixing so the weight of the tiles and wind uplift calcs must be considered.
Great to see quality work with well thought out detail. Keep posting these informative and knowledgeable vids. I’m sure younger people entering the trade benefit from your years of experience. Devil is in the details! Unfortunately customers are sometime persuaded that Price is the crucial element. Quality work, strong detailing lasts longer and is more efficient over time. 👏
Robin that's great work pir is a hard material to get precise so many don't but that must have been an impossible job to price measuring cutting fitting tapig and then battons hope whoever lives there appreciated the detail
Loved that vid. So neat, tidy and well thought out. Great care taken. Fantastic
Wonderful to see and thank you for sharing. My only gripe is that the dormers are being done as a cold roof, which is a shame given the insulation levels to the rest of the roof, but it certainly doesn't detract from the precision work you have here, it's great to see!
Love the idea of the sprocket. I've been looking at warm roof design for a while but never see this detail.
Great looking build. Good to hear the reasons for the different insulation cutting methods as well
Glad you like it
Another great video Robin. If only we could clone you a few thousand times we'd have a chance of the new builds lasting something like the length of time the Victorians expected and also only costing a few hundred pounds a year to heat. Every job I do I find myself asking, how would Robin do this ? Bravo Robin and keep up the great work.
I'm a bit of a fanatic too. A building control officer said to me once, "come on we're not building a spaceship". We I think we are now..! Every insulation,and membrane manufacturers specification are different....
Easy to get headaches these days
Brilliant video again Robin! I’ve learned so much and looking forward to the next one. Thanks mate 👍👍
Your wee jigs are a great addition.
Glad you like them!
We've just finished a warm roof on an old oak barn, we done the same as you. Out the felt ontop of the counter battens
Attention to Detail on PIR......Love it
It's beautiful....like a teapot!
Always incredible work Robin 👌
Thank you very much!
Outstanding! Congratulations on your success. In my opinion that is a world leading structure.
In your follow up video could you go into the cross flow ventilation to the rafter. You mentioned an over fascia vent which i imagine is purely for the counter lath. Your soffit i imagine is going to be vented on the eaves and you have a detail in the ridge to complete the ventilation down to the rafter.
Great videos and out on his own in construction.
I like it, especially for that type of build 👍
Wow, that looks like some tricky work going on there. You do make it look easy though. Thanks for sharing.
Great vid Robin , bet that Festool insulation saw got a good workout
Absolutely
Exemplory work. Lucky Clients!
A master piece of a structure. Well done Robin.I believe you should express all your lineal dimensions,in it's imperial equivalent for the benefit of USA subscribers.
I try John!!
I know Rob you are a gentleman
that's such a nice roof, i would just leave it open from the inside, so can look at it every night 👌😁
I don’t no what to say about that other than slightly insane and also amazing ,I’m torn
Great workmanship really impressive
Thank you! Cheers!
Great video, as usual. I’d love to see Robin move more into the biobased sphere. By now we all know the benefits of phase shifting, thermal inertia, etc, that PIR lacks. And the circularity that is lacking here. With such a craftsman at work, Robs efforts would be put to better use, making better buildings. If only the designer and client and material supplier would take the same fanatical approach, it would yield so much more. Come on Rob! Expand into real green building, it’s an exiting field with so much development still going on and innovation at much higher pace than the regular building practices.
I am always looking into this!!
Kinda strange seal everything up ,warm roof then go and add cold air albeit above insulation ,cold side it’s all getting a mine field to understand but great work as always
I wish I knew half of what you know regarding building your top of the game mate
You need to get a new shirt, changing chippy to craftsman on your back, how you can setout and cut in 3D (with a PIR offset), is amazing.
Hi Robin. I hope you registered the IP for the attachment for the ISC240. Then you can sell the license to Festool. Should be pretty easy to manufacture out of plastic/metal plate, but I would leave them to figure that out and just get them to pay you a license for each one sold. Easy money. Might not be as much as manufactoring it yourself but the pennies add up to pounds.
Market is small. probably cost me more in fees that I would get back. I have one that we have prototyped that is adjustable so keep tuned!!
Excellent insulation values, though missing a key component for the envelope, vapor diffusion. Typically in cooler climate zones vapor pressure drive is outward. The interior OSB is enough of a vapor restrictor to inhibit this outward drive. The foil faced exterior is a vapor barrier on the wrong side, inhibiting outward vapor diffusive drying. And does very little to control heat transfer. Cold climate research shows the exterior radiant barrier only reduces heat transfer by 2%, though blocks vapor on the cold side.
More important to stop air flow with continuous membranes that are permeable and liquid water tight.
Lovely work again Robin. Lots of work to do from the looks of it, how many guys would you have working with you on the joinery on a job like this? Thanks
Beautiful work! Shame to cover it up with the plasterboard and tiles 😂
Have a look into types of roofing underlays (LR, HR and Vapour permeable membrane which is commonly referred to as breather membrane). Will help clarify the requirements for ventilation (under membrane or under roof covering) and best way to install (onto insulation or above counterbattens). Membrane manufacturers such as Proctor have online webinars to help explain.
Robin,
With a tight house like this, will a heat exchanger ventilation unit be installed?
Thanks for the videos, I am not in the business but I still enjoy watching any master practice his craft. Plus, you seem like a nice guy.
An artist. Wonderful.
Excellent video robin
Thing of beauty. So nice to not see steel in the two roofs I’ve seen you do on RUclips. I’ve tried to convince two contractors I work with to investigate your method and they’ve dismissed it as too expensive. Wonder what your response to that would be.
Mind blowing work 🤯(I have a feeling the roof comes with an equally mind blowing price tag 😆)
No mate simple work and just to current regs, at the end I will do a cost for it
@@ukconstruction Simple for someone like your self but unfortunately I've never seen anything close to your stuff when I have a nosey at local roofing works. A breakdown of the costs when it's completed would be very interesting 👌
Actually just did a bit of searching and you can get an eaves closure piece that fits under the GRP valley at eaves level, looks very neat but like most things it might be a bugger to fit in real life.
I contacted building control to ask what my local regulations are (as I moved up the other end of the country) I was told work done would need to be to the Building Regulations 2010 as would be applicable anyway in the England.
Great job Robin. I always think of you as the thinking man's chippy and this job proves it😂
Amazing. Do roofers like it if you send them a Robin Clevitt video and say "quote for that"? (I assume RC is booked up for years in advance)
Hi Robin, beautiful work as ever! I have a 50 degree pitched warm roof to insulate and wondered how you calculate your hip and valley compound cut angles?
In USA they have termed it (Monopoly Framing). With a house this tight you will incorporate an air handling unit?
Seriously impressive ❤
Stunning work as ever Chap.... Thermal bridging from fixings and Any metal work?
Fairly minimal and taken into consideration by the Insulation manufacturer when calculating the values
Your parietooccipital cortex should have been working 24/7 on this project. What an inspirational dedication. BTW, what about chimneys? None in the project?
Any thing to think about if mounting PV on a warm roof? Do the fixings need to go through to the internal rafters?
Can you do a general vid on the fixings that go through the insulation rafters? Calculating the spacings, the length, the angle they're inserted, figuring out the local wind factors...?
I'm planning a self build with a mono pitch roof... Sadly, I won't have the opportunity to compete with Robin's cut precision 😳🥵😂
Membrane over the counter Batton for me also :-)
Proper job.
I’m assuming the rows of PIR aren’t glued / foamed to each other, with just seam taping outside won’t you get a slim cold spot at the joints that will be a condensation point for any vapour that works through?
We fit these tight together and the gap is minute as we are simply laying straight in a brick format, it is key that you start dead straight and parallel to the ridge!!
Great video. We were trying to look for information or videos on warm roof construction and couldn’t find anything as comprehensive as this. In the end we went for a standard between and under rafter method due to this lack of information. However, the main things that held us back are as follows:
Are the fixings driven in perpendicular to the roof or at a 30 or 60 degree angle?
Once the battens are on, can they still support the weight of people walking/working on the roof?
What was the reason for opting for insulation over and between, why not just go over the rafters only? Could there not be problems with interstitial condensation affecting the rafters?
Somewhere in the system we have to have a cost/benefit discussion on residential insulation.
Is all the costs of additional insulation worth it for the benefits which are measured in fractions of a watt.
You would need scientific equipment to actually measure it. I doubt i would ever recoup these costs in lower bills.
I am certainly not having a pop at you Robin, your work appears very high quality and I understand that you as a Tradesman follow the drawings as expediently as possible to make a living.
Perhaps In a few years time i wont be able to enter my house because it is stuffed full of insulation and I have to sleep in the garage.. (I hope this is a joke..)
More is not necessarily better.. 25mm of PIR does 80% of the insulating (From manufacturers blurb) The next 25mm adds another 5% diminishing..
nice one. such a neat job.
Thank you very much!
Great video again Robin. I must admit I do miss your little music intro !! Because you have not used osb sheeting did you have to use more trusses ? Last time I did a roof the osb formed part of the loading specs etc so just wondered how this roof works specs wise thanks
Superb job
Thank you Martin
Noce work looks much nicer thsn taking down lath and plaster and going home like a chimney sweep. Im thinking of looking into something like the hilti air cleaner to catch the airborne dust
Thanks for this detailed example, Robin, really appreciate the legwork you've done to make sense of the application spec differences. I've heard that PIR tends to shrink over time (due to things like off-gassing?). How is this accounted for in your 0.11 U value target & the design of the job? I've read about shrinkage anywhere between 1-2%.
The Use of Gapo Tape will allow for the minor shrinkage of PIR. Most boards by the time they make it onto site will have had enough time since manufacture to do any shrinkage or most of it, I have used some old stored sheets of PIR probably about 5 years old and they measured exactly 2400 by 1200 so no movement there, hope that helps
I notice you have diagonal braces to strengthen the roof. If you wanted to plasterboard the loft space, would it be safe to remove these or would it mean you need a rigid sarking? For example a layer of osb on top of the rafters before the top layer of insulation, similar to a warm flat roof construction and your gable ends?
Any chance you can do a video on buying timber please? What types there, grades, what to look out for and what different use cases are?
Proper job 💪
Hi Robin, great video, been watching a few as looking at a build in future. Quick question of warm vs cold roofs - if identical 200mm total (2 x 100mm) pir was used between rafters and either above or below rafters depending on if warm/cold roof, is either better from a energy conservation standpoint. I was wondering if colder than air temps due to heat lost via radiation in night sky on exposed rafters vs covered insulated rafters alters anything or if it did wether it’s negligible. Cheers!
insane regulations
@Robin amazing work and attention to detail. The passion you have for your craft is so clear.
I’m renovating my house, with a warm roof planned in, and I’m nearing the point where I need to find contractors (technical drawings nearly done). Based on your videos, my project probably doesn’t meet your minimum size requirements. Do you have any recommendations on how to find trustworthy tradespeople? I’ve been bitten a few times by the typical websites used to find trades people.
What’s your thoughts on FMB for example?
I've been a subscriber for years now Robin, You're a Brilliant Chippie and (Nearly) always make very interesting video's .... But this whole Anal approach to Insulation by the Construction, Boat & Campervan Build - Plus! DIY Communities is bordering on a Mental Illness Pandemic .... Do You ever take a step back, look at the situation and THINK! - "Are We being 'Played' Here?" ..... Like 'Smart-Motorways' ... I think We ARE!! .........
There's no question at all that were being completely played with these crazy ridiculous regulations ,
I'm a contracts manager & we mostly do new builds for housing association & the specifications are quite stupid now & the cost has gotten way out of hand
Hi Robin. When we do warm flat roofs we have to put the vcl between the bottom deck and the pir. Where are you putting the vcl in your pitched roof?
How do the rafters dry out with with a vapour barrier above on the insulation and below on the plasterboard ?
I appreciate this is the recommended method but it seems like ideal conditions for rot to set in.
Never done a warm roof. How do you fix the insulation to the top of the Spars? Tac them, then fix a vertical lat on top through it and into the Spar?
nice work a little different from the big build, Another question where is Ed did he start his own company?
Robin, Do you seal the PIR external joints with tape as you did at the top please?
Yes Peter
Another universe compared to our 1970s bish bash bosh house, LBC Tudors laid frog down on weak mortar, no cavity wall insulation but loads of rubbish & mortar droppings, old tar roofing felt, paramount internal walls with the matching door linings/above door everglade glass panel. Rather have masonary over timbers & osb walls though, maybe a modern version of a cavity wall and then wet plastered/floated inside to prevent air leakage.
Great video!!!
Cheers Sam!!
Scottish Building Regulations are already very different, but are changing again in January 2025, to full “Passive House” standard. Whether developer build, affordable homes or social housing.
So no affordable housing then :)
@@xbgo1856we're doing it in Wales now aswell , the spec of housing association builds are ridiculous,
Would love a step by step video on how you make the jigs for the festool saw robin 🙏🏻
OK Liam will sort something
@@ukconstruction top man
Incredible
😊
This chap knows his, "shit-from-his-shovel."
Not half bad - that.
@ukconstruction are you taking on the role of Principle Designer (under the BSA 2022) on projects like this? Seems you are making key decisions about how to comply with the B'Regs which would normally sit with the architect, but at no point mention them. I'm not saying that's incorrect, just curious as there has been a lot of confusion & mixed advice on how to navigate this new system post Oct 2023.
The house has a sweater. What I thought in the British climate zone, you would dry an envelope to the outside - given the exterior tight insulation, and a tight barrier material covering the interior wall, moisture is trapped.
Brilliant video on modern insulated homes. Some detail. Robin i see the counter batton at the ridge are staggered. So the rafter are not in the same line? As in spacings. From the front are different to the back if you understand me.
Bang on Paul, the set up on both sides is different, that is why the lattice ridge beam works so well
@ukconstruction thanks for the reply Robin . I understand now what you did. Brilliant video as always. I'm still waiting for the gazebo with the beautiful roof your going to cut. 👌🇮🇪
coming soon Paul
I would be very interested in the difference between this and the Gapotape you used on the big build as we have followed that route. Theis warm roof would not have worked for our project as the roof height would have needed to be higher. I wish our builder had your eye for precision as we had to remove all of the PIR he had installed and refit it to some sort of stnadard using gapotape.
Robin, have you done any full spec Passive House??
I think it's all madness... the price of insulation is madness... no wonder people run out of money building houses its madness.. warm deck is too expensive...even pricing up all the extra sprockets and stuff and extra time is more money.... I have done gutex on top of rafters before which is woodfibre insulation from Germany that was 16years ago.. now I put 50mm pir full sheets across the under side of the rafter with 200mm of metac high density insulation between rafters and tape all the joints of the pir to have it air thight and counter batten then normal slabs... less hassle..
A £200,000 roof with 200 year payback🤢
Hi Robin, I love your videos, you have tremendous skill and knowledge. I have planning permission to build a new house very similar to this one, just a bit bigger, particularly upstairs. I’m not a builder I’m a retired mechanic who has done various building projects. I have been researching Insulated Concrete Formwork for the walls because I could assemble the main structure myself with help from my son. There’s a company in Cornwall called R Wall, they make a very clever system. Also I’m thinking of using SIPs for the roof, I want to achieve Passivehous standards. Whilst the cost of materials may be more I think it would save a lot of labour, any thoughts on this system ? Thanks in advance.
just looking at the craftsmanship of the woodwork, it seems a crime to cover it in plasterboard
now that`s a warm roof