Browse Forums Owner Builder Forum 1 Apr 22, 2009 8:16 am Hi I’m extending out from my house and need some advice on the size of beam needed to span a 4 mtr room and supporting a roof, i have used a recycled 145x70 Oregon beam and I’m concerned that it might not hold the weight? Here are a few pics, any advice would be much appreciated. appreciaated. Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Re: Beam size 3Apr 22, 2009 2:18 pm The roof load in this application isn't very much as its iron (approx 11kgm2), but if you are itending on putting some highlight windows in the opening betwen the 140x70 and the top plate you need to know what weight the windows are? Secondly oregon of that size would have a structual rating of F5,F7 Douglas Fir Oregon (unseasoned) In your application here you could be seen to be using this as either a lintel or a hanging beam. As per AS1684.4-2006 Timber framing code the spans are as follows for 4m with rafters at 600-1200mm centres and a Roof Load Width (RLW) of approx 2.4m Oregon is not recommended for that span As for any lintel or hanging beam you need a minimum of 35mm supportt on each end I would recommend a LVL and clad it oregon if you want to match exsisting The other thing is you need to do is, have your oregon stress graded, then it may be able to be used in conjuction with the timber framing code. Ben LEADING THE WAY IN BUILDING AND CONSTRUCTION BUILDERSEDGE PTY LTD Re: Beam size 4Apr 22, 2009 8:56 pm Thanks for the replies. I’m not sure what to do about it. Not too keen on replacing it. I’m thinking of screwing a beam to the back side going around the rafters as well as making it into a truss. Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ I wasn’t thinking of adding windows but more along the lines of glasing the openings. That might add strength or possibly be a bad idea. The front rafters are 1.5 the pitched rafters are 2.3 and that span is 3.6 from memory, I worked out about 300kg each side of the ridge beam going of the weight of the iron, pine boards and rafters. The ridge beam is supported at each end of the 4mtr span so that should take a bit of the weight. As i said not too sure what to do but i know i know i can’t leave it as it is. Re: Beam size 5Apr 23, 2009 6:45 pm Why not use an Oregon LVL13 - they are available up to 460mmx85mm. That way it will match in with the rest of it without the need for veneering. Re: Beam size 6Apr 23, 2009 6:47 pm Surely this beam would have been detailed in the structural drawings required for council approval of the extension? Electrical Engineer... Don't hold that against me... And keen owner builder... Mainly the building part!! Hello everyone, After some suggestions and ideas about how to put a concrete path around the drop edge beam area on our new build. We are required to have a concrete path… 0 12872 The distance between my DEBs varies from 4.1m at the narrowest to 8.1m at the widest. 5 27307 |