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Old 11-03-2008, 11:36 AM   #16
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Deck Joist Spacing


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Originally Posted by udlooz View Post
They recommend 24" for vinyl sheets and 36" for polycarb

We rarely get 2" of snow per year here, so snow load is not likely

We do get 60 mph winds occasionally
Well 2 inches of snow can weigh a lot especially if it is high water content. Average is 15-20 pounds per sq ft. While there is little danger of the polycarb breaking it can rip out the nails holding it in.

High winds will get under your roofing and act as a kite. It could rip that up if you don't have it secured enough.

I would call the manufacturer and ask them what they recommend.

Maybe just putting in enough nails would do the job for both wind and snow.

The problem with snow is the support holding the panels on. Even though you don't get a lot of snow and it sounds like it is rare all it takes is one good snow to have your roof on the deck.

At the very least if it does snow be at home so your can shovel off the snow.

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Old 11-03-2008, 01:41 PM   #17
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Deck Joist Spacing


If you had sunk those 4x4's into the concrete 2 feet or so like a pole barn then I might think about putting a roof on, Maybe. But being you didn't you just used wood to concrete connectors. This deck is not safe for a roof. Snow load or not. A small gust of wind will level it. If you don't understand what bracing is for and how it will prevent the roof and post from falling sideways someone will need to show you because it is a little difficult to explain over a computer in laymans terms. See if you understand from this drawing.
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Last edited by James Con; 11-03-2008 at 01:47 PM.
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Old 11-03-2008, 11:54 PM   #18
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Deck Joist Spacing


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Originally Posted by James Con View Post
If you had sunk those 4x4's into the concrete 2 feet or so like a pole barn then I might think about putting a roof on, Maybe. But being you didn't you just used wood to concrete connectors. This deck is not safe for a roof. Snow load or not. A small gust of wind will level it. If you don't understand what bracing is for and how it will prevent the roof and post from falling sideways someone will need to show you because it is a little difficult to explain over a computer in laymans terms. See if you understand from this drawing.
I wasnt going to do a peaked roof, I was going to do a pitched flat roof with polycarb sheets, I assumed the rigidity of the 4x6 corner posts, which are anchored to 80 lbs. of concrete would support that. The 4x4's were more for load bearing, as they are sitting on dek-blocks anchored with simpson connectors.

Should I use lattice instead?
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Old 11-04-2008, 12:29 AM   #19
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Deck Joist Spacing


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Originally Posted by udlooz View Post
I wasnt going to do a peaked roof, I was going to do a pitched flat roof with polycarb sheets, I assumed the rigidity of the 4x6 corner posts, which are anchored to 80 lbs. of concrete would support that. The 4x4's were more for load bearing, as they are sitting on dek-blocks anchored with simpson connectors.

Should I use lattice instead?
Flat roof, pitched roof it really doesn't matter. You are creating a sail with the roof. It probably sounds like I'm picking on your deck but I'm just trying to give you some advice I edited one of your pics about the concrete anchored 4x6 post. The concrete anchored 4x6 would be fine for the deck but your now putting weight up in the air above which is gonna create leverage on the concrete mounted 4x6. ( side to side movement) The only thing I could say is finish it the way you were and see if it's stable. If not, You might want to put some braces along the back.
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Last edited by James Con; 11-04-2008 at 12:45 AM.
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Old 11-05-2008, 07:42 PM   #20
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Deck Joist Spacing


James, I see what you are saying now, it just didn't make sense before. All construction has stopped until this weekend when I can add some additional floor joists.

I have some 2" well pipe in 10 ft. sticks, I am thinking about setting one of those on each side in concrete and attaching the 4x6 post to it or the roof frame. It may be a bit unsightly but I don't want this thing flying away like you said.

This is well pipe (irrigation) not thin tubing, I would compare it to black pipe or rigid conduit.

Could you point me towards the braces? Also, I was going to use knee joints on each 4x6 and 4x4 to support the roof, does that help prevent lateral movement?

Thanks for all the advice, sometimes here I feel like people expect me to hire a pro for everything, and not DIY - I don't feel like you are picking on me

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