3,425 views ·
2 replies
3k views
2 replies
Shifting a load-bearing interior wall 3.60m?
Load-bearing interior wall of 3.6 meters should be replaced with glulam or I/H-Beam. I have consulted with a construction store and used some online calculator that calculated this. The house is 1.5 stories with 9-meter roof trusses (House width). All parties agree that I should have at least 115 x 315 for it not to sag. As an alternative, I was also given a wider model ? x 270. How tall would a corresponding I/H-Beam need to be, and what is the approximate price for one at a "regular scrap dealer"? Is it enough to stand on 95x95, (alternatively 2 pcs 120x45) or should there be something else at the ends?
EDIT I:
The neighbor, who has an identical house, has a 90 x 220 glulam in the same place where I will have mine. It has been there for almost ten years without the slightest sag, so 115 x 315 suddenly feels oversized. Opinions?
EDIT II:
Are two or three parallel beams (e.g., 42 x 225) better than one thicker one?
EDIT I:
The neighbor, who has an identical house, has a 90 x 220 glulam in the same place where I will have mine. It has been there for almost ten years without the slightest sag, so 115 x 315 suddenly feels oversized. Opinions?
EDIT II:
Are two or three parallel beams (e.g., 42 x 225) better than one thicker one?
Last edited:
johansjostrand said:
It will be the same bending resistance (Wx/Wy) as long as you don't compromise on the height or width. The formula is: bxh^2/6.
If the lumber is graded according to the regulations, there is no reason to use multiple parallel beams to achieve the same bending resistance.
If it is ungraded or rough-sawn lumber, it is better to use multiple parallel beams and combine them than a homogeneous profile of the same dimension. In the first case, you protect against potential weaknesses in the lumber, which do not align with the other beams in the profile.
_____________________
Byggaren
A 90 x 270 is mounted... Hmm... One should have had a meter of snow on the roof now so it "settled" properly. I braced the trusses so they bowed with 8 props. Then I sawed off the support legs at a "slightly too high level". Hammered them in and lowered the trusses again. The support legs naturally rest on the masonry basement wall below. Is there any risk that something could happen now?
Click here to reply