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6 answers

Again it would help to know the span of the beams.. the exact size of the beams et cetera.

More commentary about snow on roofs.. snow on roofs can add weight.. but the most cave-ins that I have analysed is that.. first there was snow.. the roof handled the added weight.. next there was rain.. ka fricking boom!

Snow acts like a big absorbent sponge when rained on. If you have a flat roof, apartments, retail stores, restaurants, exit the building when the snow is piled high on the roof and it begins to rain on it.

Pitched roofs are best for heavy snow.. it tends to just slide off.

2006-12-27 03:22:54 · answer #1 · answered by Anonymous · 0 0

Need more info:
- dimensions of of joist beams - thickness, depth and span between supports
- type of roofing material (tar & gravel, etc.

You can also look up span tables for dimensional lumber.
The Western Wood Products Association publishes its Wood Use book for about $80. They also offer a dimensional lumber span booklet where you can look up the tables for the joists in your application. It's located under Publications, Tech Notes, Spans < http://www.wwpa.org/ > Registration is required.

Note that a roof with a deflection criteria of L/360 has the most rigid roof, while L/180 is the least rigid.

2006-12-26 08:20:11 · answer #2 · answered by Tom-SJ 6 · 0 0

In addtion to the length of the joists or beams, the dimensional size of the joists is needed. Are they 2x6's, 2x8's, 2x10's? Are you looking for the "snow load" or are you planning to build some structure on the roof?

2006-12-26 09:06:25 · answer #3 · answered by Anonymous · 0 0

when u install a flat roof system u have to look at it as if it were now a floor system..........

2 x 10 syp( southern yellow pine)= 16' 1"
2 x 12 syp = 17'

so looking at it as a floor system its 40 lbs per sq ft live load and 20 lbs per sq ft dead load....

u can remove the live load( ur weight per sq ft) and just use the dead load, but have to add snow load, if needed in ur area..

i would figure 30 lbs per sq ft.........

these r clear span.......( where the 2 x touches the wall at both ends)


lic. gen. contractor

2006-12-26 09:17:19 · answer #4 · answered by bigg_dogg44 6 · 1 0

how many square feet is the roof

2006-12-26 08:05:48 · answer #5 · answered by george e 3 · 0 0

it really depends on the length of the ceiling joists

2006-12-26 07:39:52 · answer #6 · answered by ticketoride04 5 · 0 0

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