Planning to build a kind of storage in Attefall size.
It will have a pitched roof with a ridge beam and rafters perpendicular to the walls.
The span of the beam will be 6.7 m.
The building's width will be 3.6 m.
It will have tongue and groove boards, roofing felt, and possibly sheet metal on the roof.
Is it even feasible to make such a beam myself with studs and plywood or plyfa?
I was thinking of having, for example, 50x200 Triple layer, 400 mm high plywood or plyfa in the middle, and 50x200 again.
The joints can be staggered with lots of screws and glue.
The reason I'm even considering and not buying glued laminated timber directly is that I have timber, and I can get a few sheets for free.
An 8 m glued laminated beam (with overhang) I can't transport home myself on a trailer, so there will also be quite a lot in delivery cost.
I would have bought glulam. With an almost 7-meter span, it needs to be a substantial piece. I have the same construction but with "only" a 4.8-meter span. It's a 66x315 beam!
It can certainly be manufactured yourself but I'm not sure how you envision the construction. A sketch would be useful!
Here's an image, roughly how I thought if I were to make my own. Hope it shows what I mean.
Then glue and screw everything with sturdy screws.
I don't know what would be best with the plywood that's 12 mm thick but stronger, or plywood that comes in thicker dimensions. I also don't know which glue adheres to plywood, regular wood glue doesn't work in any case.
I don't think I can get hold of a used beam, unfortunately.
Here is a picture, roughly how I'm thinking if I were to make my own. Hopefully, it's clear what I mean.
Then glue and screw everything with sturdy screws.
I'm not sure what would be best with the plywood that's 12 mm thick but stronger, or plywood that comes in thicker dimensions. I don't know which glue would adhere to plywood either, regular wood glue certainly won't in any case.
I don't think I'll be able to get my hands on any used beams unfortunately.
I would use P30 rated construction plywood at least 15mm thick, preferably thicker. Double on both sides. So a total of 4 layers. Staggered joints!
I assume you mean a box construction? Or do you mean that your 200 high beams should stand directly on each other so that the total height becomes 400mm? I don't think that height will be enough, have you calculated that?
Regular wood glue (PVA) is fine provided you have good surface contact.
The reason I talked about 8 m was because the glulam beams at the building supply store were that length.
The building will be 6.7 m long inside and 7 m outside.
7 meters plus I was thinking of having at least 30 cm? overhang on each side.
Sure, maybe it could be possible to make all the overhang with the tongue and groove boards. But if you have the option, it's just as well to let the beam overhang, or at least part of the beam.
If I do it with panels, I make it 2.4 m x 3 = 7.2 m
I hadn't planned to make a box beam where joists are horizontal and panels are vertical. Instead, I thought to have all parts vertical as they should provide the best load-bearing capacity, right? Thus, the beam will be different heights, 400 mm in the middle where I planned to put plywood, and 200 mm where the joists go.
Just saw the calculation that kerto would need to be 600 high. I don't have room for that height, as it would leave too little space in the loft.
Got another idea now. If I make a box beam 400 high, with horizontal 50x150 on top and bottom and 400 mm high plywood on each side (see image). If I then make trusses inside the box, wouldn't that become very strong?
Note that there will be a joint on each "stud length" and two joints on each "plywood length".
Wouldn't it be easier for you to make your own glulam beam if you have plenty of timber? The plywood required probably costs almost as much as a purchased glulam beam. I figure that a glulam beam l40c with the dimensions 90x405 should be sufficient, slightly depending on the snow zone.
have access to some records for free. I don't think I have that much extra timber. I can also get short pieces to make trusses for free. Glulam 90x400 should be enough otherwise 90x450... is snow zone 2.5.
I let the wall plates protrude as support for the outermost rafters...
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