NandM Posted February 29 Share Posted February 29 My SE has specified using steels plates to give the RSJs the width they need to support the 400mm external facing cavity walls. Would the external-facing leaf of bricks cause a cold bridge via the top plate? As the RSJ's are within the thermal envelope - except for the support above, I'm wondering what can be done to minimise it....if it is an issue. (Beams 1, 3 & potentially 5) Link to comment Share on other sites More sharing options...
Dave Jones Posted March 1 Share Posted March 1 We have a 6M opening, I had the SE spec vertical fillets at 600 centres that were welded to stich the outler L shaped and internal box section steel. That was can fill the gaps with PIR. Overboarded with 25mm PIR backed plasterboard. Best compromise I could come up with and still guarantee zero flex in the middle to pinch the doors. 1 Link to comment Share on other sites More sharing options...
Mr Punter Posted March 1 Share Posted March 1 I have used Marmox blocks for the first course on top of the steel plate. Probably better than nothing. Link to comment Share on other sites More sharing options...
Conor Posted March 1 Share Posted March 1 Ask the SE if the beam can be moved in so it sits over the inner leaf, and the plate extension out to take the outer leaf. This will greatly reduce the crossectional area that's bridging. The plate will likely need to be thicker. Link to comment Share on other sites More sharing options...
ETC Posted March 1 Share Posted March 1 4 hours ago, Conor said: Ask the SE if the beam can be moved in so it sits over the inner leaf, and the plate extension out to take the outer leaf. This will greatly reduce the crossectional area that's bridging. The plate will likely need to be thicker. Or change it to two beams - one for each leaf. 2 Link to comment Share on other sites More sharing options...
George Posted March 1 Share Posted March 1 25mm thick top plate! Bloomin' heck. Switch to two beams, one for each leaf. Put in a row of thermoblocks if you want but it's not a major cold bridge so long as you can get 50mm PIR around it. 1 Link to comment Share on other sites More sharing options...
Canski Posted March 1 Share Posted March 1 44 minutes ago, George said: 25mm thick top plate! Bloomin' heck. Switch to two beams, one for each leaf. Put in a row of thermoblocks if you want but it's not a major cold bridge so long as you can get 50mm PIR around it. I had a design like this for mine. I switched to 2 beams bolted together because they were easier to handle on my own and less cold bridging. 1 Link to comment Share on other sites More sharing options...
saveasteading Posted March 1 Share Posted March 1 7 minutes ago, Canski said: 2 beams bolted together That's the most elegant solution, and easy to handle. then stuff all spaces with mineral wool. the heat transfer through he bolts is tiny but you could cap the ends if you wanted, to avoid a cold spot. The bolts make the whole thing into one mechanism so it is stiffer horizontally. Link to comment Share on other sites More sharing options...
joe90 Posted March 1 Share Posted March 1 Yes although I used concrete beams I used one per leaf so NO cold bridge Link to comment Share on other sites More sharing options...
mjc55 Posted March 12 Share Posted March 12 On 01/03/2024 at 16:03, joe90 said: Yes although I used concrete beams I used one per leaf so NO cold bridge What was the opening size? Link to comment Share on other sites More sharing options...
joe90 Posted March 12 Share Posted March 12 9 hours ago, mjc55 said: What was the opening size? Can’t remember exactly but about 3m 1 Link to comment Share on other sites More sharing options...
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