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.
 
  • Floor plan of a modular Nässjuhus Norrlandshus home, highlighting rooms like kitchen, bathroom, and bedrooms. Walls for a potential door opening are marked in red.
  • Diagram showing cross-section of a wall with a masonite beam labeled "Masonitebalk H 200 B" and notes on using anchor nails and angle supports.
  • Blueprint diagram of a wall section with masonite beams labeled "MASONITEBALK" and laminated wood beam labeled "LIMTRABALK" at the top.
  • Draft blueprint of a residential building, highlighting a load-bearing wall section planned for a door opening, with marked area for modification.
I can't see how I can edit my first post so I'm writing a reply:

I want to clarify that there are two masonite beams in the doorway since there is one per section. So in my world, if I place one (or even two) 45x170 studs that support both beams, the support should be more than sufficient.

I found in the app Lathunden that lightweight beams of type H200 can handle a free length of 1.66m (if you want to maintain 5.0 kN/m²).
 
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