The fundamental question is whether you think I should start this on my own, or if I should try to find someone who wants to calculate it and then a carpenter for the job.
Conditions:
-1/5 story house from '58 built in timber
-Load-bearing central wall (2"4 CC 60)
-Existing opening is 150cm and supported by a 3"9.
-One of the posts has been replaced with a turned piece.
-On the upper floor, there is an even larger arch, so it primarily supports the floor frame.
The planned intervention is to remove the pillar and widen the arch by 60cm. Workflow:
-Secure on both sides.
-Remove the pillar and existing beam.
-Brace a 2"4 on the existing wall stud to have something to lay the glulam beam on.
-Lift up a 90*315 glulam beam (or similar, i.e., oversized)
-Done!
Should I start on my own? Anything particular I need to consider?
Attaching construction drawings for load-bearing walls, upper floor plan, truss, and the construction of the truss directly above the arch, which thus consists of 2 dormers:
I made a calculation on byggbeskrivningar.se. 90*270 glulam seems to be appropriately over-dimensioned. However, the support length (52mm) is tight on the already existing support (2"4), and for the side pillar, I could only choose one glulam, I had hoped to manage with a 95*45.
On the other hand, I think my case should result in less load than the example since I have a load-bearing interior wall (around the staircase) that takes some of the floor load, and I have dormers above the archway, so the roof trusses should carry less load than in the calculation.
You can fix this yourself if you are moderately handy. Make sure no one is on the upper floor before you are done. I recommend using 9x9 pillars, but ordinary lumber is sufficient for the pillar. The transition is well-proportioned. I would like to add that normally a building notice is required for structural changes.
You can fix this yourself if you are reasonably handy. Make sure no one is upstairs before you are done. I recommend using 9x9 posts, though regular wood is sufficient for the post. The bracing is generously dimensioned. I should add that normally a construction notification is required for structural changes.
Ah, then I need to finish in one day since the bedroom is upstairs
I actually consider myself more than reasonably handy, I do all the renovations myself (try to stay away from the electrical work of course) but haven't made any major alterations to load-bearing parts before.
90*90 for the support structure, I assume? There's already a 2"4 wall stud on each side of the opening, so the post will be screwed to that regardless.
I am aware that a construction notification is required. These structural calculations from the internet should suffice as documentation, right?
In the picture, I think the opening looks to be more than 2m.
Today it is 201cm if I exclude the cladding. If I need to have 90*90 posts on each side, it will end up 13cm narrower, i.e., 188. This further contributes to the overdimensioning
It is not possible to saw out in the existing wall to get a larger bearing? A 2 by 4 that is firmly screwed into the existing wall will suffice otherwise. It is the bearing that becomes a bit weak.
Is it not possible to cut into the existing wall so you get a larger support? A 2x4 that's securely screwed into the existing wall will suffice otherwise. It's the support that seems a bit weak
The problem is that it stops at existing load-bearing studs. The alternative is to cut these away and rest the glulam beam on it as well. In that case, it would be enough to attach a 95*45 on one side to get about 100mm support on each side.
Feel free to get a stamp and press it a bit before you install the beam, so you avoid sagging from the start.
Don't forget that the transfer from the support to the floor below must be good. Preferably over multiple beams or down against the wall under the floor if it exists.
Feel free to get a prop and do some testing with it before you install the beam, so you avoid sagging from the start.
Don't forget that the transfer from the support to the floor below must be good. Preferably over several studs or down to the wall under the floor if possible.
I plan to prop at 4 points on each side and have 2*45mm studs both in the floor and ceiling to distribute the load. Should be enough to tighten a bit?
Everything will rest the same way as now. I guess there's a floor joist under the wall that the studs stand on. This joist lies directly against the concrete.
So the building notification has been submitted! Do you think the building office will approve this drawing I threw together in paint/openoffice along with the calculation above?
You need at least 45*120 for the beam to be really useful other than for taking point loads.
2 pieces of 45*90 will probably work as well, but 45*45 bends too easily.
