Lean-to

[CanuckGT]

Did a search here and really didn't come up with much on lean to's

I built a 28x38' x10' garage last summer and bought enough tin to do my garage roof as well as a lean to this summer.

I would like to know how deep into the ground I need my support beams, what size,bracing,cement,etc from anyone who has built one before.

I plan on doing the 38' length and going out from meaves enough for a 15' sheet of tin to cover the roof.

BTW,I am in Alberta,Canada

 

[Toomanytools?]

Look at this on google

You need to dig poles past frost level in your area, I'm guessing at least 4 to 6 foot.


https://www.google.com/search?hl=en...urce=og&sa=N&tab=wi&ei=Hh5FUbWAN8rArQGnuoCoCA

 

[nehog]

Does your building have a floating slab or footers below the frost level. If floating, then don't anchor the posts you are adding to below frost level, the slab will move up with frost, and stress things. If below the frost level footings were used, then put the posts down as far as the building footings, or deeper.

For sizing of the wood, you need to compute the snow loads based on ground snow load numbers and build for that number. For example, around here ground snow is specified as 70 inches, so we build for that number. You compute the weight of the snow load (usually in pounds per square foot, since I'm in the USA with it's archaic measurements system), add the weight of the roofing, and that defines the roof load. The vertical pieces you can probably get away with 4x4 or 6x6, depending on spacing and length. You will want to cross brace both the verticals and the roof to prevent twisting in the wind.

 

[5lima30]

I built a 14'x16' lean-to on the back of my garage. I used 4"x6" PT posts w/ 4"x4" corner braces. I used 2"x8" for the rafters which are 24" OC. The purlins are rough sawn full 1"x4" acros the rafters. We don't get the snow load that you do but it has survived several storms with 60-70 mph winds. My posts are about 30" deep sitting on packed gravel and back filled with gravel. Around here with our rock/clay soil you don't use concrete. The floor is crushed gravel. YMMV.

 

[REPO]

FYI, Goodon builds their pole buildings in Alberta and puts the posts 6' in the ground and packs them in with WASHED 3/4" crush stone. My 54'x100' has never moved an inch.

 

[CanuckGT]

Does your building have a floating slab or footers below the frost level. If floating, then don't anchor the posts you are adding to below frost level, the slab will move up with frost, and stress things. If below the frost level footings were used, then put the posts down as far as the building footings, or deeper.

Thanks for the reply, my garage floor is a floating slab, now I am not sure what you mean in the above quote? Don't anchor posts? Don't they have to be anchored ?
One good wind and it would be gone! Or do you mean anchored to the garage structure?

3/4 crush, no cement?

 

[REPO]

No cement around the posts. Drill holes 7 feet deep, put 1foot of he washed 3/4 crush, put the poles in the holes, square them up, and fill the holes with washed 3/4 crush.
Concrete poured around the posts will hold water and rot the posts much quicker.

My big shop is in a high wind location and has not moved ever. Email the Goodon rep in Alberta and let him explain how they do all their shops. They have built hundreds in Alberta.