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Steel beams for large cavity - two vs one


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My plans have dragged on a bit...but I'm hopeful to start this Spring.

 

I've received the SE drawings for extension we have planned and have a query about the beam design for the ground floor.  The current design is single beams with a plate as required.

 

The left hand beam will support the original cavity walls, which have a 50mm cavity, and a bedroom upstairs. The beam on the right will support a new wall that will go all two floors up to form the wall for the dormer. This will have a 200mm cavity.  Just thinking about making the build easier and minimising cold bridging - would it be better to have two single beams, especially for the one on the right?

Screenshot 2025-01-08 at 14.38.27.png

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It’s normal for a SE to specify a hit and miss plate 

He or she is trying to save you money 

Ask him to change the drawing if you don’t mind the extra cost 

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56 minutes ago, NandM said:

.... making the build easier and minimising cold bridging ....

 

I don't know how to quantify the additional costs associated with cold bridging in such a small area : and I bet nobody else  can either.  Treat yourself: forget about it. 

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