I am going to extend a house with a 16-degree slope. The span is 7m, and the "roof trusses" will rest on the walls of the long sides, so no ridge at all if you understand what I mean. It involves straight planks between the walls.
Is laminated wood necessary in such a situation, or is it sufficient to use heavy planks, like 45x220 or similar?
Any link to a good site where you can calculate dimensions. Ideally, I want to set cc120, but can go denser if it means avoiding laminated wood.
Is laminated wood necessary in such a situation, or is it sufficient to use heavy planks, like 45x220 or similar?
Any link to a good site where you can calculate dimensions. Ideally, I want to set cc120, but can go denser if it means avoiding laminated wood.
I suppose you'll have to reconsider after reading the response I received. There are many knowledgeable people on the subject here in the Forum.
http://www.byggahus.se/forum/showthread.php?t=41393
http://www.byggahus.se/forum/showthread.php?t=41393
Here you can find excellent design programs for glulam and kertobalk. You can print out a nice report to bring to the building consultation saturnus2 
.
http://www.moelventoreboda.se/index.asp?menuItem=L9
http://www.martinsons.se/default.asp?id=13332&PTID=&refid=13339
I myself, like Styx, am looking for a similar design program but for regular construction timber. Does anyone know of such a program? There should at least be tables to "translate" between K-timber and glulam?
.http://www.moelventoreboda.se/index.asp?menuItem=L9
http://www.martinsons.se/default.asp?id=13332&PTID=&refid=13339
I myself, like Styx, am looking for a similar design program but for regular construction timber. Does anyone know of such a program? There should at least be tables to "translate" between K-timber and glulam?
Had almost suspected that it required glulam..
The thing is that it's not my own house, but my sister's. There was already the same type of wing (as the one that is to be built now) and in it are just regular planks, 45x220 (I think it was), so that's why I started to wonder if it would be enough..
The thing is that it's not my own house, but my sister's. There was already the same type of wing (as the one that is to be built now) and in it are just regular planks, 45x220 (I think it was), so that's why I started to wonder if it would be enough..
It becomes twice as strong, i.e., it can handle double the bending moment. If the load is on both, they do not need to be joined at all, at least not from a strength perspective. You achieve exactly the same effect by laying the beams twice as close, e.g., cc 600 instead of 1200. I still don't think it will work, possibly in the ultimate limit state (i.e., the risk of the beam breaking) but not in the serviceability limit state (deformations) as the deflection will be far too large. But you would have to calculate it to know for sure.
/Lars