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Old 05-08-2019, 12:36 PM   #1
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Building a desk with roof covering


Hi DIYers!
I am planning to build my first deck! I am a little intimidated with building the covered portion of the deck. My question is the support structure. I will digging 24" down with concrete footing using 8"x8"x12' beams for the post and 8"x8"x20' for the roof (header beams?). Do you think I need a beam in the middle of the header beams since it's 20' foot long? Also (separate question) do you think there is enough post to support the deck?
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Old 05-08-2019, 01:35 PM   #2
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Re: Building a desk with roof covering


Adding to a deck or to the house. Posts are the vertical members that hold up beams.

20 ft is to far for most beams and an 8x8 would seldom be used as a horizontal beam.
The bottom of the footing has to be below frost depth for your area the size of the footing should depend on the load for the deck and the roof and any loads on them like snow and the quality of the soil at the bottom of the hole. The concrete pier on top of the footing can be a smaller round up to above ground level.
The size of the beams also depends on the applied loads.
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Old 05-08-2019, 02:11 PM   #3
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Re: Building a desk with roof covering


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Originally Posted by Nealtw View Post
Adding to a deck or to the house. Posts are the vertical members that hold up beams.

20 ft is to far for most beams and an 8x8 would seldom be used as a horizontal beam.
The bottom of the footing has to be below frost depth for your area the size of the footing should depend on the load for the deck and the roof and any loads on them like snow and the quality of the soil at the bottom of the hole. The concrete pier on top of the footing can be a smaller round up to above ground level.
The size of the beams also depends on the applied loads.
This will be added to the deck as a stand alone structure 10' away from the house, but attached to the deck. We rarely get frost in my area but code is 18" for my area. The load will be the roof rafters, OSB boards and shingles (<=700kg), and it never snow in my area. What size horizontal beams do you suggest for the roof? 8"x10"? or do I need more posts at center?
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Old 05-08-2019, 02:19 PM   #4
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Re: Building a desk with roof covering


I clicked on this because I wanted to see why a desk would need a roof. Doing paperwork outside? One letter difference between desk and deck.
Aaaaanyway....you should look up the span charts and load tables. Don't just guess which it kinda seems like you're doing here by choosing 8"x8" for a beam, or do you mean post?
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Old 05-08-2019, 02:27 PM   #5
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Re: Building a desk with roof covering


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Originally Posted by phentium3 View Post
This will be added to the deck as a stand alone structure 10' away from the house, but attached to the deck. We rarely get frost in my area but code is 18" for my area. The load will be the roof rafters, OSB boards and shingles (<=700kg), and it never snow in my area. What size horizontal beams do you suggest for the roof? 8"x10"? or do I need more posts at center?
Normally we do just have 2 ply 2x10s meeting on a center post. The roof design would best be with trusses so you don't need any center support for that. Are you going for a certain look with big posts and beams?
If you are going for permits, they will correct your plan for footing size if they don't like what you plan for.
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Old 05-08-2019, 03:02 PM   #6
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Re: Building a deck with roof covering


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Normally we do just have 2 ply 2x10s meeting on a center post. The roof design would best be with trusses so you don't need any center support for that. Are you going for a certain look with big posts and beams?
If you are going for permits, they will correct your plan for footing size if they don't like what you plan for.
I wanted to keep it uniform with the posts, but was concern if it can hold without more posts at center, the roof will be an A-frame trusses system. I can increase the size of the foot to 24" wide and 36" deep.
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Old 05-08-2019, 03:28 PM   #7
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Re: Building a deck with roof covering


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I wanted to keep it uniform with the posts, but was concern if it can hold without more posts at center, the roof will be an A-frame trusses system. I can increase the size of the foot to 24" wide and 36" deep.

Can you find a picture similar to what you want.
And to clarify I brought a picture of footing and pier
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Old 05-08-2019, 03:50 PM   #8
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Re: Building a desk with roof covering


Not sure how you arrived at 8x8 beams, but 20' span is pretty long. Usually you would get into some LAMs to span that and just box them out decoratively. But the roof is the contributing factor. One sidenote, I have been dinged when trying to use pergola columns integral to the support of the deck. Sometimes site inspectors like to see roof structures independent of the deck support, because its hard for them to figure out regardless of the engineering put into drawings.

Your pier spacing from furthest out goes 7'o.c., then 4'o.c., to 5'o.c. why?
Your building dept. might have a brochure giving you good starting points on structure sizing and footings, but it might be a good idea to get an engineer on board being both a little green and in the Bay Area.
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Old 05-08-2019, 03:52 PM   #9
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Re: Building a deck with roof covering


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Originally Posted by Nealtw View Post
Can you find a picture similar to what you want.
And to clarify I brought a picture of footing and pier
I only have a picture of the footing for the deck and do not have a drawing for the roof support. But I would assumed it's something close to it.
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Old 05-08-2019, 04:28 PM   #10
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Re: Building a deck with roof covering


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I only have a picture of the footing for the deck and do not have a drawing for the roof support. But I would assumed it's something close to it.
Usually the roof has an over hang so we bring the posts about a foot from the corners and let the railing of the deck run passed them on the outside
Less posts for the deck itself and the joists can be hung off the other deck
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Old 05-08-2019, 04:37 PM   #11
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Re: Building a desk with roof covering


A frame like this?
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Old 05-08-2019, 04:40 PM   #12
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Re: Building a desk with roof covering


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A frame like this?
Yes, exactly with a lower pitch.
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Old 05-08-2019, 04:52 PM   #13
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Re: Building a desk with roof covering


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Yes, exactly with a lower pitch.
Not a job for a beginner.
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Old 05-08-2019, 06:38 PM   #14
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Re: Building a desk with roof covering


I think you should go discuss your plan with the building permit office.

Some jurisdictions in the Bay Area have height limits on accessory structures.

As an example, I wouldn't see that deck and an A-frame roof happening in a community that has a ridge line height limit of 16 feet on an accessory structure.

You also may have lot coverage limits to worry about.

Better to find out up front rather than wasting a lot of time trying to design something they won't let you build.

That roof structure is going to need a permit, whether the deck does or not.
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Old 05-09-2019, 01:10 PM   #15
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Re: Building a desk with roof covering


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Originally Posted by Oso954 View Post
I think you should go discuss your plan with the building permit office.

Some jurisdictions in the Bay Area have height limits on accessory structures.

As an example, I wouldn't see that deck and an A-frame roof happening in a community that has a ridge line height limit of 16 feet on an accessory structure.

You also may have lot coverage limits to worry about.

Better to find out up front rather than wasting a lot of time trying to design something they won't let you build.

That roof structure is going to need a permit, whether the deck does or not.
I am trying to avoid the city and permits. My neighbors will not see the structure (I have a lot of trees), maybe I should just stick to building just the deck. So I am confident there would not be any complaints into the permit office. I will talk to a structural engineers about my plan for the covering and see what he thinks.
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