JackofAll Posted February 13, 2023 Posted February 13, 2023 Hi, Engineer has speced 25mm thick phonotherm 200 for the thresholds of the doors to create a thermal break. Had to look up product and see its just like a piece of wood so my question is this, how is that fixed to the concrete in an insulated raft. I see that the upstands need to be recessed to accommodate the board. Could it be as simple as sinking several long screws in back of board to set in the concrete?
IanR Posted February 13, 2023 Posted February 13, 2023 I take it your threshold is over the EPS upstand? and the suggestion is to recess the EPS and lay the Phonotherm over to spread the load? I used a GRP "L" profile, and yes, added screws to the "L" Pofile that were then captured in the slab when poured. Like this:
JackofAll Posted February 13, 2023 Author Posted February 13, 2023 (edited) 3 hours ago, IanR said: I take it your threshold is over the EPS upstand? and the suggestion is to recess the EPS and lay the Phonotherm over to spread the load? I used a GRP "L" profile, and yes, added screws to the "L" Pofile that were then captured in the slab when poured. Like this: Thanks @IanR The threshold is indeed over the EPS upstand but just looking at the drawing, see attached, the width at the top of the upstand is only 50mm in comparison to that in your drawing. The GRP L profile looks the same job just different material, though it comes in 3m lenghts which maybe cheaper than having to buy two lengths of phonotherm as i only see it in 2.4m lengths. Edited February 13, 2023 by JackofAll
IanR Posted February 13, 2023 Posted February 13, 2023 Looks to me that with the narrow 50mm of EPS under the threshold, yours would benefit from the higher U Value that I assume Phonotherm has, over GRP, to minimise the thermal bridge. Your EPS former also angles down at 45° on its inner wall, from the threshold, so an L profile would leave a small void. I'd stay as specified. Assuming it needs to be in place before the pour, I guess it needs sticking to the EPS to stop it floating away? Can I ask whose raft that is?
JackofAll Posted February 13, 2023 Author Posted February 13, 2023 32 minutes ago, IanR said: Looks to me that with the narrow 50mm of EPS under the threshold, yours would benefit from the higher U Value that I assume Phonotherm has, over GRP, to minimise the thermal bridge. Your EPS former also angles down at 45° on its inner wall, from the threshold, so an L profile would leave a small void. I'd stay as specified. Assuming it needs to be in place before the pour, I guess it needs sticking to the EPS to stop it floating away? Can I ask whose raft that is? @IanRAs in who designed it?
IanR Posted February 13, 2023 Posted February 13, 2023 Yeah, who designed/Engineered it. There's more and more people offering them and I don't recognise the former profiles, so am "just interested".
JackofAll Posted February 13, 2023 Author Posted February 13, 2023 10 minutes ago, IanR said: Yeah, who designed/Engineered it. There's more and more people offering them and I don't recognise the former profiles, so am "just interested". Tanner Structural Design 1
IanR Posted February 13, 2023 Posted February 13, 2023 1 minute ago, JackofAll said: Tanner Structural Design Ah, OK, I got a quote from TSD also, but profiles were a bit different to yours, but it was 7 or 8 years ago now.
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