It probably shouldn't be any sort of RSJ, but should be a cavity lintel. This would minimise the thermal bridging and look right.
But that's not where you are!
But that's not where you are!
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Is it okay to fill the cavity between 2 RSJ (running parallel) with Expanding foam
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Something tells me a cavity lintel won't look right, perhaps it was the O.P.....
At the O.P....
Cold bridging can be minimised using thermaline plasterboard foam fixed onto the reveals....
On the inside the I beam is covered with a insulated plasterboard. This external wall is the old style double brick wall without a cavity. It's interesting to see that in those days they used to put a brick across both layers as a tie and now we use butterfly wires.
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Maybe not as strong as a single skin, no. However, the latest reg’s cavity wall (150mm) are very stable, when built correctly.
Where does cavity come from?
OP has a notionally solid wall built as 2 stretcher skins which is NOT as strong as a proper fully bonded wall.
I was just commenting on cavity walls. Our SE and i had a chat about them recently.
Yes. I did say that too. I talked about 'stability' and from an SE (wind load etc) point of view.
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