Browse Forums Building Standards; Getting It Right! 1 May 05, 2010 1:54 pm Hi there, I was hoping someone with more skills in frame/truss design could look over my efforts of designing frames and trusses for our garage. We're pretty much ok with the wall frames, just going studs at 600 centres, having a PA door in one wall. The front wall with the garage doors is a bit more tricky. We were thinking solid timber lintels, or is there a better option for this? The main thing I was wondering about was the bracing within the trusses. Does the following look ok? I based it on how the house frames had been done. Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ And at each end we were going to use a dropped chord truss with outriggers to get our eaves. Something like the following, again based on the house trusses. Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ We're looking at 600 spacings on the trusses, and the plan is to line them up with the studs in the walls (I'll need to fix up the studs around the PA door). Does this spacing look ok? We were going to line it with gyprock eventually (direct to bottom chord). And will probably use steel top hat battens on the roof. Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Am I on the right track here? Is there major things missing? Any thoughts/suggestions? Am I wasting my time and being tight not getting a draftsman to do it for us? Thanks for taking the time to look. Cheers, Pete viewtopic.php?f=38&t=8824 Re: 6x6m garage frames (timber) 2May 05, 2010 3:49 pm The trusses would need to be designed by a truss firm or a structural engineer. The plaster will fix directly to the bottom chord at 600 centres but it may be more economical to run at 900 & batten out for the plaster. (You'd have to do the sums) Peter Clarkson - AusDesign Australia www.ausdesign.com.au This information is intended to provide general information only. It does not purport to be a comprehensive advice. Re: 6x6m garage frames (timber) 3May 05, 2010 10:47 pm Hi Peter, a timber lintel will be suitable for that application particularly because you have that post in the center and being on the gable end it wont actually be carrying roof load so it will be a smallish beam. Your drawings are good, all though your truss manufacturer may alter your web layout but that one you have is adequate. They will also want to know the roof pitch and how much overhang you need. That's the correct drawing with the outriggers and the verge truss. The trusses don't have to line up with the studs but would be more structurally sound if you did. Your plans are fine, you should see some of the mud maps I have seen. Re: 6x6m garage frames (timber) 4May 10, 2010 1:24 pm I have just built a 6.2m x 11.4m extension and built the trusses myself using 250 x 45mm oregon beams, my building surveyor passed them ok my design for our cathedral ceilings had the large cross beam with one vertical beam in the middle and the two diagonal baoms all attached via large gan nail plates. In the original plans I did not call them roof 'trusses' rather roof 'beams' so that I did not require truss manufacturer to build. I have had a structural engineer check them and he says they are bomb proof and my spacing is around 1200 centres between beams. In memory I think that you can use 200mm timer to span over 6m. But dont quote me on that. Re: 6x6m garage frames (timber) 5May 11, 2010 5:13 pm Thanks for all your replies guys. I've emailed the plans to the inspector to get his thoughts on them and we'll see what happens from there. I've also been looking at the roof building manual and have been thinking of pitching it with rafters and a ridge beam. Kinda like what foc1 has done (is that right?) Thanks nomad for the lintel info too, and we'll do some sums regarding truss spacings and battening for ceilings. Cheers, Pete viewtopic.php?f=38&t=8824 That sucks! Hope it all works out. Good to move away from steel anyway for all your reasons, but it's also thermally poor. 16 17875 If this is a custom build then I would expect the builder to set out the door frame closer to the wall to avoid the gap between architrave and the wall and or specify… 9 8316 |