Help with patio roof

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  #1  
Old 08-24-19, 12:55 PM
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Help with patio roof

I am trying to rebuild my patio roof.
It is currently just a slatted flat trellis type cover.
I want to replace all the rafters and hangers, use OSB sheathing, composite asphalt tile.
Existing patio:
posts are 4 x 4
joists are 4 x 10 at 10' horizontal span
rafters are 2 x 6 at 7' from eave to joist, 24" on center

Questions are:
In order to get 1/4" to 12" slope and stay under clay tile of roof I want to notch the joist 2" at each rafter, effectively turning it into 4 x 8.
I also want to overhang the rafters past the joist 30" to extend shade.
I live in High Desert of California. Little rain, no snow.
Is this do-able?

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Last edited by PJmax; 08-24-19 at 01:21 PM. Reason: resized pictures
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  #2  
Old 08-24-19, 02:22 PM
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You can't just notch the outboard end of the joists to get slope. This puts a tremendous stress on the joist/ledger board/house frame connection. Don't now the building code but I would not make a roof with joists on 24 inch centers. Depressions between joists could be greater than the slope (quarter inch/foot). In the pics, the thickness of joists and rafters look the same. I would re-frame the roof before adding sheathing and shingles..
 
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Old 08-24-19, 04:52 PM
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The very top lumber you see is just 1 by 1 lattice pieces. The second pic shows the joist. It is 4 x 10.
My intention is to re-frame the whole patio leaving only the posts and the 4 x 10 joist. I can't remove it as it ties into a header inside the wall. I have considered taking the rafters all the way to the Stucco and bolting a new ledger to the face of the wall. I can't think of any other way of getting the slope without cutting into my roof, which has clay tile.
Any way of getting the slope without cutting the roof?
lowering the support at the exterior edge, is the only way I can see.
A 4 x 8 is not enough for a 10 foot span?
what about the 2 x 6 rafters at 12 inches.

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Last edited by PJmax; 08-26-19 at 09:16 PM. Reason: reoriented/resized pictures
  #4  
Old 08-25-19, 04:57 PM
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Sorry, but I am confused. Your latest pics show a different patio construction (at least how the patio is connected to dwelling) when compared to the earlier pics. Are you talking about roofing one or both? If one, which one?
 
  #5  
Old 08-26-19, 07:28 PM
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Thanks for checking out the post. They are all of the same patio cover. It is really more of a trellis now. Trying to make it a covered patio.
I will explain the current framing.
The outer support is a 4 x 10 attached to a header in the wall, and on two posts at 10 feet apart.
On top of the 4 x 10, and attached to the eave fascia are 2 x 6 rafters at 24 on center with 7 foot span from fascia to 4 x 10.
On to of 2 x 6 rafters are 1 x 1 light weight strips.
I want to remove the strips, replace the 2 x 6 material, and sheath the top with 7/16 OSB and composite asphalt tile.
Here is a bigger picture.
My issue is getting the 1/4 to 12" slope. The 2 x 6's are now level.

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Last edited by PJmax; 08-26-19 at 09:18 PM. Reason: resized picture
  #6  
Old 08-27-19, 05:47 AM
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The fascia board is carrying half the weight of the patio lattice with no vertical support. Replacing the lattice with a finished roof will result in the fascia board carrying more weight. Since the fascia is only supported at the rafter tails, it will separate at some weight unless supported vertically to footings. The only way I see of getting a sloped patio roof is to build a free standing patio frame (to support a roof)starting underneath the present roof overhang.
 
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Old 08-27-19, 12:36 PM
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Thanks, I was afraid the fascia would be the weak spot. I will rethink whole idea. My friend suggested breaking stucco and attaching to side of house trusses on top of exterior wall top plate. I will investigate that route.
 
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