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Old 06-01-2020, 10:35 AM   #1
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Carport Roof construction


Hello, I plan on attaching a Carport to the side of my house using hangers for the rafters screwed to the facia. The carport is 21 feet in length and 11 feet wide and due to the current house roof drip edge it only leaves me approx 4 1/2 inch to attach the hangers, so if I'm using 2x6's the hangers will hang approx 1 1/4 lower than the facia board so might look weird. So my question is, should I replace the facia board with 1x6 board and let the board hang down a bit from the soffit but the 2x6 hangers will look flush or can I use 2x4 lumber for the rafters at 12" ctrs and just sister every other? I'm keep the slop standard at 1/4 inch per foot, so roughly 3 inch slope over the entire width.
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Old 06-01-2020, 12:15 PM   #2
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Re: Carport Roof construction


Important Q: What kind of roof will you put on the rafters?
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Old 06-01-2020, 12:23 PM   #3
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Re: Carport Roof construction


You should be able to use 2x4s at 12 or even 16. Other factors though- Snow load, wind load, roofing material (weight). I'm thinking carport, light weight roof.
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Old 06-01-2020, 12:33 PM   #4
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Re: Carport Roof construction


so that fascia is nailed into the end grain of the 16 rafters with 2 nails each. So you expect 32 nails into end grain is going to hold up 1/2 the weight of the roof and snow loads and what ever wind loads. Good luck with that.
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Old 06-01-2020, 12:34 PM   #5
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Re: Carport Roof construction


Thanks for responding, we do get a lot of snow at times but for the roof I was thinking either Plywood and Shingles or just Clear/White Corrugated PVC to allow light to still shine in since we do have a Window on that side of the house as well.
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Old 06-01-2020, 12:37 PM   #6
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Re: Carport Roof construction


Quote:
Originally Posted by matrixebiz View Post
Thanks for responding, we do get a lot of snow at times but for the roof I was thinking either Plywood and Shingles or just Clear/White Corrugated PVC to allow light to still shine in since we do have a Window on that side of the house as well.
Tell us about the roof on the house. including pitch and maybe a picture.
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Old 06-01-2020, 12:40 PM   #7
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Re: Carport Roof construction


Quote:
Originally Posted by Nealtw View Post
so that fascia is nailed into the end grain of the 16 rafters with 2 nails each. So you expect 32 nails into end grain is going to hold up 1/2 the weight of the roof and snow loads and what ever wind loads. Good luck with that.
So should I remove the Facia and re-install it with 3 inch screws into the existing rafters instead?
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Old 06-01-2020, 12:44 PM   #8
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Re: Carport Roof construction


Here is a picture of the side
Attached Thumbnails
Carport Roof construction-house.jpg  

Last edited by matrixebiz; 06-01-2020 at 01:07 PM.
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Old 06-01-2020, 01:06 PM   #9
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Re: Carport Roof construction


I would open the edge of the roof, cut off the tails and set the rafters on the wall.
Attached Thumbnails
Carport Roof construction-mat-4.png  
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Old 06-01-2020, 01:09 PM   #10
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Re: Carport Roof construction


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Originally Posted by Nealtw View Post
I would open the edge of the roof, cut off the tails and set the rafters on the wall.
Okay so basically removing the soffit area so the carport 2x4's will be sitting on the wall? I would have to put something to stop the critters from entering the main roof
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Old 06-01-2020, 01:12 PM   #11
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Re: Carport Roof construction


Quote:
Originally Posted by matrixebiz View Post
Okay so basically removing the soffit area so the carport 2x4's will be sitting on the wall?
Well, the 2x8 rafters would be sitting on the wall, yes.
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Old 06-01-2020, 01:48 PM   #12
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Re: Carport Roof construction


My carport is basically free standing on its own posts, but its roof connects to the house.

The old version had the house's eave extended to meet the almost flat carport roof. That area rotted out prematurely.

When I re-did the house roof, I jacked up the car-port, and extended the rafters to reach onto the house's wall.. like Nealtw suggests. Its only about a 6' span between the first posts and the house wall (porch/breezeway) and the car parks in the 9' wide spot beside it.

I cut and fit soffit vent strips into each rafter bay to keep out the critters.
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Old 06-01-2020, 01:58 PM   #13
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Re: Carport Roof construction


Okay, thanks for the advise, sounds like a solid plan
Can you attach a picture of it so I can get a visual of the final outcome? Thx
@Nealtw - What tails are getting cut off? Where my current roof is shingled onto?

Last edited by matrixebiz; 06-01-2020 at 02:00 PM.
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Old 06-01-2020, 02:05 PM   #14
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Re: Carport Roof construction


Quote:
Originally Posted by matrixebiz View Post
Okay, thanks for the advise, sounds like a solid plan
Can you attach a picture of it so I can get a visual of the final outcome? Thx
@Nealtw - What tails are getting cut off? Where my current roof is shingled onto?
The house rafters stick out about 18" to the gutter. you just cut them off flush with the outside of the wall.

Where on you house are you going to start. Right at the corner or?
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https://www.fema.gov/media-library-d...6/chapter7.pdf
figure 7-14
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Old 06-01-2020, 02:10 PM   #15
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Re: Carport Roof construction


Yes and go the the whole width of that section which stops just after the window and just before a side door into the house that is not shown there.
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