Sizing glulam beam, relieving, hole cutting in outer wall Hajom sliding section

[wasseng]

Having trouble finding sizing tools, any tips or anyone knowledgeable here who can provide advice on the dimensions of glulam?

Planning to make an opening for a sliding glass door of 7.60m
The sliding door (Hajom) has 2 supporting pillars and I was thinking of adding additional supporting 90x90 glulam pillars around the door.

Checked the wood guide but couldn't figure out if I need to go up to beams as high as 90x360/90x405. If so, I don't have space between the door and the ceiling.

The sliding door, as mentioned, has two supporting pillars so the width isn't 7.6m between the pillars... maybe I'm overestimating.

The beam will support the load from 6 rafters c/c 120 with a span of 8m (truss rafters/W-truss rafters), snow zone 1 (western Skåne)

Best regards / Joakim

 

[fb35523]

If you can handle the load from the trusses in another way, you can significantly reduce the beam dimension. This can be done in the attic by having them supported by another beam there, but it can be a complicated operation in itself. Alternatively, you can work with double beams side by side. It's probably an outer wall, so you can have an outer and an inner beam each taking half the load, maybe even a third one between them, but then you might lose too much in insulation. A steel beam that supports the trusses and a much lighter wooden beam for attaching the sliding section is another option. Think creatively!

 

[wasseng]

The beam is 215mm deep, so there is clearly room to place a wider beam than 90, but I hope I can reduce the dimension to something lower than 90x360 since the section, as mentioned, has supporting columns.

Absolutely right to think creatively; one option for me is to lay the reinforcement in the attic against the rafters. I can easily access the attic since there's only cladding on the short side. However, I will have to tear down a lot of shelves (and the framework for the shelves) if I choose that option.

If I still need the larger dimensions of laminated beams that don't actually fit, it will have to be a steel beam, but it will be really heavy and the risk for the builders is significant when it needs to be installed.

I would appreciate some help with the dimensioning of the laminated beam, as mentioned, as the first option.

 

[largab]

The section is 215mm deep, so there is definitely room to install a wider beam than 90, but I hope I can reduce the size to something smaller than 90x360 since the section, as mentioned, has load-bearing columns.

Absolutely right to think creatively, one option for me is to lay the support construct on the attic against the trusses. I can easily access the attic as there are only panels on the short side. However, I'd have to tear down a lot of shelves (and the shelf framework) if I choose that option.

If I still need larger sizes of glued laminated timber that doesn't really fit, it will have to be a steel beam, but it will be really heavy and poses a significant risk to the builders when it needs to be installed.

As I mentioned, I would appreciate some help with sizing a glued laminated timber beam as the first option.

But what is the maximum clear span? It is that which determines the dimensions. The load-bearing columns in the section should carry the load, shouldn't they!?

 

[wasseng]

But what is the max free span? That's what determines the dimension. The load-bearing pillars in the section should bear the load, right!?

Yes, exactly, they should bear the load.
If I interpret the drawing correctly, it's 3790mm between the two load-bearing pillars in the section, so I assume that = free span.

If I check the wood guide, then perhaps a 90x180 laminated beam might be enough... but this is really not my expertise...