If I screw and glue three 45x220 and use these as a glulam beam, how much load can I expect to support in the middle of the beam if I have a span of 470cm? Might I need additional height on the joists to handle the span?
Is there any reason why you don't buy glulam directly? Byggmax has cheap glulam that is often in stock:
http://www.byggmax.com/se-sv/prod/virke-obeh-tra/reglar-stomme/limtra-balk-pelare/default.aspx
If you are going to do this, you should use a genuine construction adhesive like Cascosinol, and then it won't be cheaper than buying glulam directly.
http://www.byggmax.com/se-sv/prod/virke-obeh-tra/reglar-stomme/limtra-balk-pelare/default.aspx
If you are going to do this, you should use a genuine construction adhesive like Cascosinol, and then it won't be cheaper than buying glulam directly.
The reason is no bigger than that I have a bunch of 220
r lying around at home, but I might have to bite the bullet and buy some proper glulam instead.
r lying around at home, but I might have to bite the bullet and buy some proper glulam instead.What are you going to use the beams for?
The question of how much you can load is actually not relevant. Wooden constructions are never loaded up to the breaking point. It's the sway and deflection that set the limit, long before the breaking point is reached. You must also have a substantial margin, for defects in the wood, insect attacks, rot, etc.
The question of how much you can load is actually not relevant. Wooden constructions are never loaded up to the breaking point. It's the sway and deflection that set the limit, long before the breaking point is reached. You must also have a substantial margin, for defects in the wood, insect attacks, rot, etc.
Yes, it's true, deflection is probably the problem for me in this case. I will have the beam to switch off a ridge beam at the outermost part of a porch. It will be an open construction, so I don't want a W-shaped truss for aesthetic reasons. The ridge beam has a 2.5 m free span to the outer wall of the house and 4 m long rafters, c/c 120. Roof pitch 27 degrees.