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Yes, I imagine those things will drive variances. So if you assume a decent but not faultless job of that sort of detailing. Do the EST look too pessimistic, how close to the building reg values could you expect with a reasonable attention to detail?

I asked a similar question over in the plumbing forum but no takers on answering this aspect. I'm looking at using wet UFH in the extended area of our kitchen / family room. I am concerned about UFH output vs heat loss. There is a lot of glass, plus there is an existing area of the old...

Looking at my rough heat loss calcs there are 4 big drivers of the overrun. 1) Old area opened up that presently has old solid floor and no heating (exclude that and treat in isolation for now, as it may need different heat solution) 2) Glazing area even at 1.3 - 1.5 manufacturer overall U...

Using a private inspector. He has plans hasn't raised anything yet. All the building elements are designed to meet building regs u values. But the amount of glass pushes up heat loss and I wonder whether 100w/m2 will be enough. It is short of rough heat loss calcs I made.. Edit: it is made a...

Is there a way to reliably calculate the maximum output possible out of a wet underfloor heating system? Can it take into account a maximum floor temp of 27C? It would be on a gas boiler, so flow temp can be set as required. This is for an extension, the net floor area available for UFH piping...

Thanks. I'm not building it, feel I should now after this thread, but I feel out of control unless I can at least understand what is proposed is being built and it being doable for the builder and a decent solution. Like others have commented, that is what the plan should really show - I have...

Mmmm. Yes, thinking back to start of thread you already told me that. I forgot that was you! It does look a lot more logical and better separated having the two distinct roof spaces and not dealing with all the extra work to get the warm deck extended, for what, in my design case maybe an extra...

Well at least you appear to get on and have a good communication line through to your builder and designer! Yes, that false pitch timber detail you appear to have started with looks much the same. So even though you may not be an expert, but have improved you sand castles somewhat, what have...

Aha got you thanks for your reply. Back to thinking about this whilst lying in bed!!

Yes, I feel less worked up about it now, I just still feel even if a timber upstand is say 1.4 u value against 1.2 or or 1.3 for the roof light. It is still the worst performing element which probably makes it most susceptible to condensation even if the overall performance hit is not that...

Yes ok. I just found a website that allowed selection of materials and while it seems pretty generic in that all the timber types I selected came up with the same U value for same thickness, it was exactly what you said. http://www.changeplan.co.uk/u_value_calculator.php An 18mm plywood...

Thanks. Yes other posters mentioned lantern but it is a roof light shown in the section and that is what we are using. I've looked at quite a few and as I say, most have fairly similar kerb profile requirements between 75 and 100mm before plasterboard. See for example vitral attached which is...

I could post the full plans up briefly in PDF then take down or PM anyone interested. I just wouldn't want this post to get to the designer before he had had a chance to sort out and before I have got an improved set in place. There are a lot of detailing issues but most appear around the...

Yes, I'm totally with you. I really want to see the issues and iron them out, there are a few more than even raised here. Like there is another steel sitting on top of the steel shown above the rear elevation where the false pitch is. It is very very tight there. It will need chamfering, but...

Ok. interesting. Yes, that what I was thinking about the back of the strut for the pitch upstand, although to be fair he hasn't shown it or called out in text that it is formed in anything!! So another detail required.... What I was really referring to, when I asked you about the insulation...

Yes exactly. Most of the flat roof lights (5 degree pitch) seem to be about 90mm allowance including plasterboard. So 75mm without. So it is either a ply box section or as woody says timber with 25mm... My box section would seem higher performance , but maybe not worth it for another 25mm pir...

Yes full plans. Although I' m probably using private but his plans do get through local authority. But as pointed out and also the things I am adjusting for in my mind, like firrings, roof pitch, no box gutter detail other than some text, there are a lot of things that should be tidied up.

I know about the 150mm upstand. In plans it is roughly 150mm. When I was talking about 90mm I was more talking about the width of upstand which you are terming cill width I think. I was just thinking if you made a 18mm ply box section with segment uprights you could get up to 50mm board in...

Thanks for you interest and reply. Really do appreciate all the input. Sorry, my lack of roof detail experience may show, I do not know what seggy ridge is, depsite a google search! The reason why plain tiles are used is to match existing roof pitch and elevation finish. I'll upload some more...

It would solve my problems fairly easily if it is sound. It is not that different to what the designer has drawn. Just eliminating the air gap with insulation. Effectively the ceiling level insulation and any top up fill just becomes a continuous extension of the warm roof insulation between...