Hi all had some great help of tony 1851 and jeds when i ask rsj help
so rsj size is sorted
have a lean to conservatory, with a tile roof running at 18 deg
question about rafters to rs j now
trying to save a bit of high
can i bolt a timber beam to the web of the rsj and fit the rafters...
that's very true,
and thanks to all you guys for helping me,
clearly the SE i used went way over the top on his vaules
so the beams were too much!!!!
anyway all sorted and thanks again
hi well just a safty margin. working on
figures of yours and mine
tiles 0.1
batton 0.01
felt 0.01
raf 0.2
cel 0.15 mine say 0.35 which looks high
0.47
if i stick with 0.75 LL mine 0.6
would give me 1.22 total so your right moving to 1.35
is a safety margin
well thanks guys looks like i need to get a set of SE calculations look a bit over the top the set i have
using a LL 0.75
and a DL 0.47 with what i have but take it up to 0.85
instead of the 1.27 he used
hi am i being thick but using the formula just making sure i read it right ?
for uc 203/203/52
0.0063*1.87*6^3/5259
im getting
0.0004838745
must be doing something wrong ?
steel tables say 5259
but what about area of roof?
ie 24 sq mts come in to this ?
thanks for that looking at the calculations i have he say deflection is 4mm
and need to stay under 8mm, a pair of 203/133/30 would give me 7.5mm deflection which is too close for a 6mt span
what deflection would i expect with a 203/203/52 ?