Exterior support be...
 
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BISF Exterior support beam

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Good afternoon 

we are looking at doing a 2 story extension to the rear of our BISF however I was wondering if anyone has done this? Also does anyone know if the rear supporting beams are horizontal and all one across the total width of the house? 

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@hells6482

You would need to install additional RSJs' to support any stanchions that are removed during your build. A good structural engineer should be able to provide the correct detail and specifications.

The outermost support stanchions of a BISF house are primarily vertical.

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