Terrain Guru Needed

[Allen42ACJ]

Snow loads tables have this taken in to account.
A wet heavy snow will not fall off a roof unless it is extremely steep.
12' span is still a 12' span no matter what the pitch.
Measure the vertical on a rafter at different pitches.
The number gets bigger as the pitch increases but the rafter gets longer to.
So it comes out the same.

The ladder idea is,you would not want to use one level extended all the way as a bridge,but standing up it is stronger because of gravity..
Just works in one way unless you are racing soap box cars..

[daydreamer]

The ladder idea is,you would not want to use one level extended all the way as a bridge,but standing up it is stronger because of gravity..

What? stronger because of gravity..., I don't think so.

Let's try, load, span, deflection and to much of either equals disaster.

[Allen42ACJ]

See if this helps.
2 different pitches.The vertical rafter depth is different,so the steeper longer rafters are bigger where gravity is pulling from,straight down.
So a longer rafter is just as strong as the shorter one.

The span is how far the rafter is covering,half the house in this case..
When you figure for the weight that can go on,snow load,what falls off is not figured in..

I might not be the best one to explain it..
Try asking the question on CT..

[daydreamer]

I personally think that using a truss is better than ceiling joist and rafters. And I agree with Larry when he said, "Truss manufacturers are the experts in this design and know all about slopes and snow loads for each area."

If anyone is interested in how to determine joist and rafter sizes you may want to check out this website. http://www.planhelp.com/public/98.cfm

Look for Span Calculator by the American Wood Council in the article.

[daydreamer]

Original topic - Terrain Guru Needed

Latest discussion - roofing loads

Synopsis - Hijacked trainwreck thread

[Deirdre]

Allen,

What is that funny little gnome, cat, or sourpuss thing doing under your signature block. He looks so pissed. Are you starting a new year with a sour outlook already; it's only the eighth day of the new year.

[Allen42ACJ]

Dee
I hope not,I was just playing and it is a work in progress..

I don't think they figure snow will fall off so a steep pitch was to be as strong as a low pitch.
The rafter size does not get small 2x8 to a 2x6..But they do get longer..

[Allen42ACJ]

There are different snow loads for different places like you said.
I forgot what we are even talking about now..
Does pitch matter?
Post the question on Chief Talk and see what is said..

[Larry]

I gonna' make a pitch to check with the local authorities, always. Nobody wants a snow job from an uninformed user.