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!
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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