I am planning to move a doorway in the load-bearing wall to make a slightly larger bedroom on one side in the basement. My plan is to brick up the existing doorway with masonry blocks and then open up a 170cm hole in another location, see picture... red is what I am closing off, blue is what I intend to open. The idea is to support with a glulam beam, but it is difficult to know the dimensions. The house is 7.20x13.20 meters and the load-bearing wall runs through the middle of the house. The house is single-story with a basement. I've been told that it should work with two glulam posts 90x90 and a beam of 90x225.
Is there anyone knowledgeable who has some good advice?
90x225 beam and 90x90 posts are sufficient if the span is only 1.7 meters. It matters that there are trusses because then there are no roof loads on the center wall.
90x225 beam and 90x90 posts are sufficient if the span is only 1.7 meters. It's significant that they are truss rafters because there are no roof loads on the heart wall.
Thank you very much for the answer. A quick follow-up question though. The truss rafters I have are divided on their lower part (the studs that form the attic floor), joined with nail connections. Does that make any difference regarding roof load on the heart wall?
Just noticed something I've overlooked. Right where I'm supposed to open up, the joist rests entirely on one outer wall and the heart wall due to the staircase below. I don't know how it's supported at the staircase. I should probably bring in an engineer after all, as I'm worried about under-dimensioning even if I over-dimension.
If it is a correctly dimensioned truss construction, it only rests on the outer walls, even if it doesn't look that way. But it's always best with suspenders and a belt.
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