/ d say 7-8" deep RSJ is what you want and a crane to install it./q
A crane?! Meh he
Think of all those trendy fold away multiple French windows that fools want these days (for opening 10 days a year...) I can't see a crane being requi red or appropriate to install the equally long beams above them? beams that will have to take more load hence be even heavier than my rqmnts?
Nah several blokes & several milk crates....
Jim K
Agreed. The last one (20') took two of us and a skate board!
No crane necessary - 7" is 178x102x19 so for 6m about 120kg, 8" is
203x102x23, so about 140kg. Remember that with suitable temporary rests you need only lift one end at a time so an easy 2-person lift, one if fit.
Aha just the man!
Care to give us a demo of superbeam to guide my garage re-roof plse? :>)
Others who offered seem preoccupied currently...
Details upthread....
Cheers Jim K
I've done my bit in getting to a "spec" where sensible responses can be posted.
Not getting at you personally, but a lot of posters looking for help fail to give even the most basic detail.
If you want advice on snow loading you had better tell us where you are.
pfft! can't or won't?
;>)
Jim K
Assuming 6.5m span and beam taking half of 6m span flat roof, gives a roof load of say 3.75kN/m plus an engine load at centre of 500kg/5kN, assuming an unrestrained beam you'd be looking at a 254x146x37 but if the beam can be considered to be restrained - not unreasonable if joists cross beam and there is some form of blocking or runners either side of the top flange a
203x133x25 would be ok: decent margin strength-wise but deflection (26mm) probably as large as you'd want to go - though remember this assumes full snow load and engine and most of the time neither of these will be applied.But this isn't advice - if in doubt you need advice from someone who has seen the job or at least a plan.
Thanks for the advice Tony - understood.
Currently over the 6m width there are two 6.5m span poorly plywood "beams" in there - well propped up...
First at ~2.4m in, then another at ~4.8m (then 1.2m to the other side wall)
I was thinking to replace with steels and rebuild/repair the flat roof on top... presumably that would change things re steel specs?
(ALternative would be to run 6m span at 90degrees to existing but would be more work)
Thanks again
Cheers Jim K
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