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I expect the concrete floor is part of a newer extension. We have the same mix of suspended floor and block and beam concrete. In teh barn where we had a previous garden office we retained the bit of concrete slab, rather than dig up and dump on landfill, and used the glass beads to top it up to the right height. So I think it would work for an overall foundation. I found this link, but I think there will be a lot more if you want to go exploring. endeavourcentre.org/first-ever-poraver-foundation/ Another option to look into is HempCrete. again a quick search threw up this but I'm sure there's a lot more about. www.ukhempcrete.com/faqs/#:~:text=What%20can%20hempcrete%20be%20used,%2C%20ceilings%2C%20and%20roof%20insulation. And finally, you could use ground screws. We used them for the remainder of our new garden barn. I think I've posted a short here on YT showing them being put in place and you can see more here: nomoredigging.co.uk/ground-screw-installers/thames-valley-england/ground-screws?NMD+Thames+Valley+(London)+%5BPM%5D&hsa_acc=6347209486&hsa_cam=20647719552&hsa_grp=&hsa_ad=&hsa_src=x&hsa_tgt=&hsa_kw=&hsa_mt=&hsa_net=adwords&hsa_ver=3&gad_source=1&gbraid=0AAAAAC8ibK9GR6xMSYY6EnqO01h1XerQd&gclid=EAIaIQobChMI1NP-g8m2iQMVuKFQBh0UFCRCEAAYASAAEgLF0vD_BwE Hope this helps.

Hiya- so pleased the video has been useful. We put on the second layer of airtightness membrane for 'belt and braces'. We realised that we hadn't sealed the lower layer of membrane so there were gaps where it met the wall and also didn't seal each layer together so while it wouldn't allow air through the membrane itself, there was still space for air to come through at the joins. We went for the second layer after having an airtightness test which showed that air was still coming through, So we added the extra layer rather than lift the insulation up again and sealed it on at the floor/wall join as shown. Also sealed each layer to each other using contega tape. (since learned that there is a sticky layer at the edge of the membrane so it's actually very easy to join all the layers together) If you don't want to do that just make sure there are no gaps in the underlying layer. Hope it goes well

@@ecorenovationhome thanks that is so helpful. Just to clarify, may I ask what the cause of the gaps were on the lower layer? Was it just not sealed against the joist and wall properly? From your experience, do you recommend adding a second top layer of breathable membrane over the insulation material, before putting the floorboards back down? I also wondered if you could share the change in temperature you've experienced and do the floorboards feel warmer? One anxiety I have with this whole process is that it may cause condensation in and around the joists - have you had this experience at all? thanks again for such an important video!

@@benjaminh860 The reason for the gaps was that it is just really hard to get a tight seal between the membrane and the wall when you are creating the slings for the insulation. Plus for us, at that point we still had no plaster on the wall - it was just bare brick - so it would have been almost impossible to create an airtight seal. By putting a later of airtight membrane on top of the insulation we were able to create a tight seal. We used Contega tape to seal wall to floor and on the joins where the different pieces of the membrane met. Can't really talk about change in temperature, but we are certainly warmer. Having retrofitted the whole house (Victorian, 120 years old) we are now saving 75% of our energy usage, so it has made a significant difference. Re condensation: this shouldn't be a problem. The membrane is airtight but also breathable, so any water vapour can move right through the structure. (just in case you're not familiar with breathability, it actually refers to vapour permeable or vapour open. Daft label really!)So air can't get through but vapour can. Hope that answers? Shout if not.,

@@ecorenovationhome aww thank you! I really love your channel and I find it more valuable listening to people who have actually done this and can feedback their experiences, rather than trusting tradespeople. If you ever decide to, a video on the changes you made to get a tighter seal would be amazing and very welcome. Like an update video? Thank you again, you have been so helpful!

@@benjaminh860 Thanks - you must be reading my mind! I'm working on the script for a video on airtightness right now, So shouldn't be too long.

Thank you! Glad it was helpful.

Maybe you should take your own advice? You've only got 3 subscribers!! I'm not one of them and never will be. Judith is doing just fine and I don't think she will need your help, reaching her audience! Stop spamming other ppl's videos!

​@@mindymindytc1384If you notice I'm not a content creator, I don't even make videos. I am an SEO specialist. I am always active in serving my esteemed friends. I commented after seeing the problem of your channel. You can see the proof if you want. Thanks 🎉🎉

Thanks very much. It's really helpful to hear that - keeps me going!

This is where we got it from. I expect there are other outlets. unitylime.co.uk/shop/brand/geocell/expanded-glass-lightweight-beads/

@@ecorenovationhome this link leads to a 404 page, no product

@@feketegabor4629 Hiya- copied it again, emailed it to myself and it worked, so fingers crossed unitylime.co.uk/shop/brand/geocell/expanded-glass-lightweight-beads/

The glass beads are mixed with water and natural lime. So the beads essentially are in place of the sand.

@@ethanbeebe6193 get the word out - maybe someone can start one?

@@ecorenovationhomelisten the (US) doesn’t deserve this. The minute this opens at any state people are going to abuse it and take advantage of it. (Stealing and eating directly from the bin) . Ex. Wawa’s free air tire 🛞. For no reason people cut them off. Been to several locations with the exact same issue .

For real i would love this so so much!!!

@@racheljohnson6723 The refill shops here in the UK have been started by independents. One of our supermarkets did pilot it and I think it's still being trialed. So if you're looking for a business idea................

Thank you - that's an accolade!

Well done sorting it out! The architect who supported me writing the book made very clear that insulation without airtightness would be disappointing. Draughts get through the merest slither. Did you redo it?

There are issues with the cans, but on the basis this is one off fun activity for the Beaver Scouts, much less of a risk than walking alongside a busy road, I think.

Hiya - the joists go into the brickwork of the walls and there is a small brick wall across the middle of the room to support the joists.

@@ecorenovationhome Is there a chance that damp could rise up the bricks and into the timber?

@@kingquinn3897 Yes. To avoid that the joists sit above the damp proof course, so it blocks any rising moisture and above the air bricks to stop condensation.

@@ecorenovationhome Thanks for that. But was the damp proof put in all existing buildings when they were built or is this something that has to be added now?

@@kingquinn3897 my understanding is that a DPC was out into older houses. Often layers of slate. I know we had that (1901) We also had an injected DPC added.

Hi Matthew - yes, the same membrane is used for both. It's a breathable, airtight membrane. It will usually need to be breathable since it is primarily houses built before 1930 that have suspended floors and they were all built as breathable systems. Hope that answers?

It does thank you, I’ve seen other systems where the bottom is airtight and breathable but the top is not breathable. The reason given is to prevent moisture condensing. To me that doesn’t make sense as you’d trap in moisture and the underfloor vents should take care of any moisture. This approach seems to make more sense.

@@matthewdeakin8266 Totally agree with you. That makes no sense. Full breathability is what will stop moisture condensing.

I think it works well but there are concerns. Not so good for the environment. Need to make sure your insurance covers it. Some mortgages lenders don’t like it - so worth remembering that if you’re going to sell. How is it working?

Thank you. It is pretty special on so many levels. Really easy to use, plus it was a big attraction to my kids friends, so they always wanted to visit! And now my grandkids all love it.

Now that one would never have occurred to me but you’re quite right 😂😂

New to RUclips! Still learning the ropes and this one got away 😂😂. Il have another go

HAHAHAHAHAH

New to RUclips. I’ll try again😂😂

Great idea.

To hide a very thin person??????

@@ecorenovationhome this confirms that you are not a united states citizen XD

@@Napll3YTgot it!

@@ecorenovationhome to hide my good friends smith and Wesson

@@Foreverylike 🤣

Underfloor heating is fine over insulation. Kingspan is not your best option. Suspended floors move and it won't move with it, so you'll end up with draughts coming through. Plus it uses toxic chemicals so not good for health in a well insulated airtight home. We discovered a product called Econna Board which went on top of the joists/ insulation. It is tongue and groove which means better for airtightness and it has grooves for the UFH pipes. No idea about the providers here, but this link will give you an idea of what I mean. www.warmup.co.uk/underfloor-heating/water/econna-joisted-floor Hope that helps. Let me know if you have more questions. You can read more about it in my book if that would be of any help amzn.to/3EOBHjM It's a lay persons summary of the whole retrofit process, so you have enough of the basics to talk sensibly with the builders (who don't know a lot more than we do!)

Well there you go - I didn’t know you would have a suspended floor in an 80’s house! We’re all learning🤣🤣. There are so many different firms if insulation now. It amazes me. Wood fibre is just one of the sustainable options. Just take a look on this site to see what’s possible unitylime.co.uk/product-category/insulation/ This site shows the formal way of doing what we did ourselves and talks about reasons for different types of insulation. Let me know what you think. www.ecologicalbuildingsystems.com/post/best-practice-approach-insulating-suspended-timber-floors