Reducing Cold Bridging RSJ

[BruceK]

Good morning all.

We're doing a stable conversion and, to give us more space upstairs, have decided to use steel beams to replace the attic trusses shown on our original drawings. Building Control seem happy with most of the calculations we've submitted but our structural engineer has indicated we need a universal column (203 x 203 x 46 UC) to use as a lintel spanning a 4 metre opening for bifolding doors in an outside 9" solid wall. The problem is that because the beam supports the full width of the wall (as well as the end of a beam supporting the floor above) there's no room to do much about insulating it from either side. How would you suggest overcoming the problem of cold bridging in a case like this? Building Control have understandably asked for this information and I've no idea how to reply. They also want to know how the steel is treated and weather protected. Your advice would be much appreciated. Thankyou

[Temp]

Can you use two narrower beams side by side..

 

http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15148

 

Although read the thread as there are issues.

Edited October 17, 2020 by Temp

[Temp]

How is the wall itself being insulated?

[PeterW]

As @Temp said - you will need to insulate the walls so how do you plan to do that ..?

 

I am also interested how using steels will get you more space than an attic truss - are you going for a steel purlin arrangement with thinner rafters..??