We are working on an extension of a single-story house with a basement and need to create an opening in the outer wall of 3.6 meters. The drawing doesn't quite match as the opening should be as large as the extension, but the dimensioning, done by a structural engineer, is based on the correct length. The beam will be glued laminated timber 115*315 and the columns 115*115. The engineer assumed that the basement wall is made of concrete, but it turns out to be made of concrete block, 230mm. Do you think the basement wall can withstand the load from the columns or does the basement wall need to be reinforced in some way? One idea I have is to place the columns on the sill which is 50*145 to spread out the point loads from the columns, but remove the 74*95 sill to reduce the risk of indentation in the horizontal timber. Does that sound reasonable?
I can't reach the engineer now and would like to get the beam installed during the Christmas holidays, so any advice would be appreciated.
Without being a designer, I believe that a 230 mm concrete block wall should handle the load without any problems. Especially with a pressure-equalizing sill. For that matter, the 74 x 95 sill should definitely remain to help distribute over a longer/larger area.
I think it's important to get this completely right without taking chances, so wait until you've reached the designer.
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