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This is easily one of the very best explanations of the differences, advantages and disadvantages between dual and triple pane glass that I have ever seen on you tube or elsewhere.

I want the sound proofing from extra panes. I am even considering a triple outside plus storm windows inside for a room or two where I want to make noise any time of the day or night without disturbing neighbors. Thanks for the warning about the specialized glass for sound proofing. I didn't know I could get a different one designed for it without it being custom made.

When installing a timber sash window in an old property, do you sit the frame directly onto the stone/brick sill?

this is BS, triple is way better than double. just make sure you put argon gas in between sheets

Think you missed some important points, triple glazing you have two seals so increased failure rate, much heavier so hinges and runners won't last as long, also won't let as much light in the room. But for things like aluminium bi-folds on new builds you'll probably need triple glazing to meet building regs U-values.

Accoya is a scam it's just crap timber soaked in vinigar. The only timber aclimitised to the British weather is Douglas fir It's been used hundreds of years and is still about

I'm a Norwegian Woodworker (I've got a substack!) and this is one of the most truthful woodworking videos I've seen in a long time. I agree with every point you make. I've made and copied all sorts of windows and doors these last thirty years, and have come to exactly the same conclusions you have. As they say: Great minds think alike :-) There is a lot to learn by studying where and how older stuff failed. In Norway we often use 'tight' & 'fat' pine for windows, and they can easily last 100 years if well made. This is the first video of yours that I've stumbled across, but I like what I see of the shop in the background: Looks like someone who takes their business seriously. I'll subscribe and be back for more -- I can learn things here!

Great two videos it’s a shame it’s had soo little views I make windows and doors at my work and my boss refuses to use anything other than sapele or meranti as that’s what he’s used for 40 years. I look forward to being able to make the switch over once he retires.

Hi, what paint you use for Accoya made windows, and how often it needs repainting during the life of the window?

The issue that has not come up is that U-values are proportionate. That means a U-value of 0.5 loses half of the heat per hour of 1. Likewise, a low spec double glazing of 3 could would mean a 6 fold improvement in heat loss for top spec triple glazing, but only about 2 fold for low spec double glazing. Our 2003 detached house has dry fill cavity wall with a U-value of around 0.6. The other issue to consider is that upgrading your heating would be less impactful if you use much better levels of insulation. I’ve communicated with several window companies, and they just don’t seem to know the science behind their products, with one asking “what is a U-value?” My response was that I couldn’t understand how anyone could make an informed choice without knowing that. Finally, top spec triple glazing (U=<0.6) is an absolute fortune, compared to the local/ national ‘White Gold’ type companies. I was quoted >£50k for our home. I’ve not taken this forward, because despite huge increases in fuel costs, it’s still cheaper to pay it as we’re only really talking about 4 months of the year

We went tripled glazing as the cost difference wasn't that much but we figured that to the layman 'triple glazing' is going to be an increased selling point should we ever move.

Very good ty

I hope his day job isn't being a sales rep for windows cos he was fair negative, especially regarding triple glaze!

Very interesting thank you

last 5 seconds of the vid he finally talks about what the title says he would

This was interesting. Watched the whole thing. It's apparent you love what you do. Will be on the lookout for such material as a remodel contractor in rain-prone western WA state.

Hi Andrew. great video showing you and your work team doing beautiful work. Hope I didn't come across as self centred previously asking question after question as if you were there purely to answer my questions. Didn't mean it like that. So easy to get caught up in our own projects. Anyway, appreciate your videos just for the inspiration alone.Thanks, and take care.

Hi Andrew. I'm planning on replacing the newly framed windows I hope to make, using the Accoya treated timber you have suggested, and reuse the old panels of glass from my existing windows, which are standard 4mm annealed glass, and install those panels as the inner pane of the newly framed double glazed windows. it seems to be fairly standard to use 4mm annealed glass in double glazed windows, other than in those application where laminated, or toughened glass is needed for safety reasons; I'm talking about the inner pane here, as the exterior panels most often needs to be treated for U Values due to regulations, or toughened for security. Can you think of any reasons why this may not be a good idea to reuse the surplus of glass one may have left over from the previous windows. I have tried googling this question but am unable to get google to even understand my question, let alone answer it. Thanks again for baring with me on this one. thanks Andrew. take care. Jude.

Hi again. Excuse me for asking what may appear naive silly questions but thats OK as I am not a woodworker, but love timber. I'm hoping to make the windows for my home very soon. Fingers crossed that I can get it together to do such a thing. Timber is my favourite medium. The point you made about how internal windows sashes tend to shrink as they dry out. Would in cured timbers avoid any more shrinkage in the timber. Also, assuming one has the skill , would a dove tail joint be a better method in joining a timber window over a straight edge connection. Hope you make many more of these videos. Take care and thank you, and greetings from Australia.

Hi. just found your site tonight and already gone through most of your videos. A thought just occurred to me, why not seal the end cut of the timber surface, that have the open grain. I guess if that would work somebody would have done it centuries ago. So I'm just wondering if you can explain why sealing the open cut of the timber grain wouldn't work in stopping a lot of that absorption of moisture. thanks again.

hi. great videos. thanks. just a question about the spacer and the seal. I am going to try and have a go at making my own double glazed timber windows. With the spacer, could Accoya timber be used, as it is extremely stable as you've pointed out, could it be used as a spacer. And as I have no access to hot melt butyl, could other sealants be used such as silicon. Also, just about the timber framing of a window using Accoya, does it matter what type of joint is used. Would a dowel joint be OK using another species of timber, or would it be best to use the Accoya timber even in a dowel for the joint connection. Thanks very much for this series of videos on timber windows. brilliant.

In my opinion the two differences i found is its slightly warmer with triple glazing and the biggest difference is the sound you can barely hear noise through triple glazing

Very well done, informative video. Thanks for posting it.

Sounds like hes trying hard to sell double glazing.

I attended the homeshow in Scotland and they done a talk on tripple glazing with data slides. They said that anyone selling tripple glazed claiming its better sound reduction than double, it isnt, very marginally it is but the human ear would not tell the difference.

I'm not a rep for Rationel, but I have seen their products in use and still performing well after 20 years. How do they achieve this kind of performance? I believe they use softwoods. Also what about laminated timber construction?

If there wasn't a cartel operating in the UK which restrict the supply of Accoya more people would use it. They restrict the supply which keeps the price at a premium. I enjoyed the video but I think you are being a bit bias. By the way Accoya is not a "green" enviormentally friendly timber, the carbon footprint that timber travels from harvesting to processing to customer is horrific. European Oak can and does last for well over 100yrs and the jury is out as to whether Accoya will last as long. It's also brittle and can be damaged far easier than Oak. You repeated that Oak joints on the old doors had opened up due to the Oak not being stable which again is only part of the story. How often was the old doors maintained and I've seen some very poorly made Oak doors which moved not because of the oak be "unstable" but due to poor construction techniques. I do use Accoya for certain jobs like Bi-folds etc but as I say the cost if ridiculous.

very informative.

Very informative, thank you. Will triple glazing stop the condensation that builds up on the bottom of the glass? Our double glazing pushing 30 yrs old , I’m looking to renew it & looking for the best option.

Great video, very informative. The only thing I would have liked to have had some info on is how important is spacer size when it comes to triple glazing? As far as I understand it, triple glazing needs a sufficient spacer to be effective. Not sure how much of this is correct. Thanks

Excellent concise clear summary of the pros and cons of both double and triple glazing according to circumstances 👍 thanks!

Great video and very informative. What’s your experience with screws and locking mechanisms. I was told we would have to specify stainless screws and paint inside the lock rebates or they will corrode?

Thanks for this video. Very informative and thought provoking 👍🏻

what struck me when using accoya was how clear it was, virtually no knots , virtually no cracks at board ends, so very little waste before you start, straight as an arrow, hard though, i had to predrill all screwholes even on supposedly self drilling screws. we got a grant for our community garden and i chose accoya for all the raised beds and the pergola, i also built the most expensive compost bins known to man , so i hope the 50 year guarantee holds up ;o)

"Now let's check out this SEVEN YEAR old field trial" *mic drop* Love it, great video. Thanks! Currently looking at getting accoya timber sash reinstalled and this is pretty reassuring.

Great video, thank you for taking the time to make this. Always welcome to see more long term results if you have those.

Just curious, how does Accoya compare to thermowoods?

Very interesting. Thanks

Fantastic to see Accoya windows looking so good 5 years on. Excellent choice, and great work Andrew Jaynes joinery!