I want to create an opening approximately 500mm in a load-bearing wall. I will be filing a building notification, but I need a bit of help regarding whether I need to contact a structural engineer or not.
I live in a Nässjuhus Norrlandshus constructed of modules (see image 1). The load-bearing beams are made of masonite beams (image 2), except where the kitchen opening is. There, there's a glulam beam (image 3).
Where I plan to open up the wall, there is a masonite beam at the top and 45x70 studs with c/c 60 from floor to ceiling. On one side of the opening, I will keep the existing studs, and on the other side, I will install new studs (image 4). The opening will be approximately 135cm. Can a masonite beam support a span of 135cm?
I have spoken with a neighbor who built an identical house at the same time ours was built. He says just to go ahead, but I would like another opinion.