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Hello I know this topic has already been extensively covered on the forum but there is however a slight variation which i am looking for a solution please.I have spoken to two builders who cannot provide a suitable explantation. Overview Proposed new build extension (drawing below) with 3600mm x 2100mm opening to accommodate bi-fold doors. I have been advised to have a rsj installed above the doors due to weight of roof design. 450mm thick wall construction details as follows (photograph below) Outer 150mm facing in natural stone 100mm block 50mm void 50mm insulation 100mm block The drawing (below) is from an architect.He has not provided a drawing where to position an rsj above the intended bi-fold door. Speaking to a couple of builders they suggest a wide steel plate be welded to a rsj in order to achieve the required width . My questions are - Although feasible - this would not stop thermal bridging? - Where would the bi fold doors sit in relation to the stone / block work - would this also be an issue? Any advise or comments would be appreciated. Thank you very much for any assistance
