[saleen21]

Hello figure I would ask the experts here and get some recommendation and advice on my current project.

I plan on adding an overhead to my existing patio and coming off the house to do so.

I'm looking to cover my 18'Wx20'D patio and coming off /extending the current roof line of house. the current pitch of existing roof line looks to be about 2x12 pitch.

I plan on adding ledger board on house to attach the rafters, I will use six 6"x6" post for the support three out from house 10' across and then three more at perimeter 20' across. I will then have 4"x6" post resting ontop of the 6"x6" post.

I plan on using 2"x6" for the rafters on 16" centers extending from the ledger board on house and resting on the 4"x6" post. Then use 7/16" OSB sheathing with H clips.

I guess my question I have is using 2x6 on 16" centers overkill or too much and if current roof height on house is 11' Height what would be finished roof height 20' out at a 2x12 pitch.

Any questions suggestions, recommendations would be greatly appreciated.

I attached pics of what I'm working with

 

[joecaption]

Live in an area where there's snow?
Not a great plan how your suggesting doing it.
You can not and should not just attach it to the fachia.
What your suggesting is going to end up with an almost flat roof.
Post need to be sitting on piers which would need to be cut into the slab.
The pitch on that porch looking thing is already to low a slope.

 

[Oso954]

+1 to what joe said.

It will also be low enough at the far end to block the view from those windows unless you are squatting down. All you will see is roof if you are standing.

It will also block most of the natural light in the back of the house.

You got so many design concerns with this project, I would strongly suggest that you hire an architect to design it for you.

 

[joecaption]

Or go with a Pegola instead.

 

[ron45]

How many times have we seen this.??
Lets get the roof on this sucker....
Then we can skip all that other bull crap....?

 

[ChuckF.]

Look at your neighbor's house, he has a ridge that meets his roof at a right angle and goes straight back, with a much more attractive pitch. That's the right way to do this. It's a big job to do it right. Or, as Joe says, go with a freestanding pergola.

 

[craig11152]

skip the 2-12 pitch. Go with a 1/4-12 or 1/2-12 pitch. That will give you more head room. 20 feet of 2/12 will drop 40 inches. 20 feet of a 1/4 will drop 5 inches. 20 feet of a 1/2 will drop 10 inches. I did something very similar to my house 15 years ago. No regrets. When I step out my back door instead of rain and snow I have a 16x20 screened in space where I can fire up my gas grill in January during a snow storm.

 

[saleen21]

I live in Louisville Ky, snow is very unpredictable, this past year we got maybe 3-4" at most in one snow fall, besides aesthetic looks, structurally not sure what issue is if I continue current roof line, and I'm not even exactly sure what roof pitch is but if my measurements are correct I got close to 3/12 (2.75) and about a 20-25 deg angle. Here might be better pic from side. (not sure why pics are sideways)

 

[craig11152]

snow is simply not a big issue despite earlier comments from people who don't see much snow. Believe it or not states with heavy snow have plenty of flat roofs.
For what you want to do you need to have a flat roofing product and minimal pitch so as not to lose too much headroom as you move away from the house.