Roof framing

[BigMike62]

We close on our new house Wednesday. I already have approval from the Architectural Review Board in the 'hood to put a 10'x12' addition on the back of the garage for a shed. It has to have a hip roof that blends with the existing hip roof. I'm trying to draw up how I'm going to stick build everything. The additional has to blend into the house like it is continuous. I've build big sheds from scratch but never added onto a house. The roof is going to overlap on top of the current roof on two sides. Here are some pictures of what I'm doing. Once the two sides are framed, I'll attach base boards on the roof for the trusses to attach. Once the roof is framed, cover with OSB. Install valley flashing and use tar under the valley shingles. Unlike the picture that is hack-photoshopped, the shed roof will be above the current roof. Or, should have the shed roof angle in under the soffits? The main thing the board stressed when approving, it can't look like a shed was added and has to look like an addition to the house. Sounds easy enough LOL. Suggestions are welcome!

 

[jar944]

I would try to avoid two flat/dead valleys like in your picture

 

[Firebrick43]

I agree with Jar944 completely. Dead valleys will guantee a rotted roof decks and leaks inside your home.

The only decent way I see is to take the roof deck I marked below and build a new deck parrallel to to it further down the roof so it will cover your addition.

 

[The Tool Tyrant]

I believe Firebrick is correct in what he is describing. Since the new shed rear wall is inline with the existing wall, the CORRECT design is basically shifting the existing hip/ valley to the right. Being as the new shed adds overall width, the ridge will naturally be higher than it is currently, and will still terminate into the main roof hip. The existing rear hip will 'disappear' as it will blend into the new roof. The existing slope on the left side of the existing ridge will extend to meet the new ridge.
I wish my computer skills were better so I could draw it out, but trust me, I've cut many a conventional roofs in my life.

 

[coldh2o]

I believe Firebrick is correct in what he is describing. Since the new shed rear wall is inline with the existing wall, the CORRECT design is basically shifting the existing hip/ valley to the right. Being as the new shed adds overall width, the ridge will naturally be higher than it is currently, and will still terminate into the main roof hip. The existing rear hip will 'disappear' as it will blend into the new roof. The existing slope on the left side of the existing ridge will extend to meet the new ridge.
I wish my computer skills were better so I could draw it out, but trust me, I've cut many a conventional roofs in my life.

Yes, another vote for this approach.

 

[billconner]

Om on board with concept, just wish I could see a drawing that doesn't end up with a flat spot on top.

 

[bakmopar]

How old are the existing shingles? Siding? Hopefully getting it to match is not an issue.

 

[coldh2o]

Om on board with concept, just wish I could see a drawing that doesn't end up with a flat spot on top.

No flat spot, just an extension of the existing ridge and valley.

But it is a lot of roof work for a small addition.

 

[Firebrick43]

No flat spot, just an extension of the existing ridge and valley.

But it is a lot of roof work for a small addition.

Thank you for rendering that. I actually tried drawing lines to show it but it never came out close to being right.

 

[manwithtools]

But it is a lot of roof work for a small addition.

Yes it is and given todays prices, there is a good chance the OP is going to be shocked how much this little storage area will cost! I would not be surprised to see numbers north of $20 - 25k.

 

[mike93lx]

Yes it is and given todays prices, there is a good chance the OP is going to be shocked how much this little storage area will cost! I would not be surprised to see numbers north of $20 - 25k.

North is right...

Hire that out and I bet the quotes are closer to 50k than 20k

 

[coldh2o]

The other option is maintain the existing ridge and create a new hip and valley. It won't match the existing roof pitch(es) and the framing would be pretty funky. Cheaper though.

 

[billconner]

I would work toward a different design that the HOA would accept. Something that looked like a sunroom or conservatory, and not disturb existing roof. Panels, not windows if you prefer. It's getting to be relentless roof and clapboards.

 

[yatg]

Might be better off putting it at the right end of that wall. Would have a roofline similar to the current bumpout on the left. No matter what you do, the $/sqft cost on this is going to be huge.

 

[BigMike62]

Thanks for everyone's input. I'm planning to to frame the roof more like the picture attached. This is a house under construction that they added an addition after it was already framed.