Roof/Truss Questions

[ludakris04]

Hello,

I am starting to plan out my garage extension and have been talking with a contractor. What I have in my head and what he is saying arent matching up. So I thought I would ask you guys about what I am thinking and if it is correct.

So, Behind my garage, I want to go straight back about 16x18. I was planning on a header along the house and rafters coming off that to the outside wall. Thought this was the easiest way.
The hickup in it all is that I have a small section of roof that hangs over where I want the rafters to go. This section is the sofit side and about 4 rafters. MY thought was that these could be braced vertically where they are on the support wall, and the ends could be cut off.
The contractor wants to run the roof off of this roof and the full 18'. This would cause the interior walls to be shorter (8') to gain enough slope.

am I missing something? Hopefully I explained it correctly.
The first pic is the back of the garage and you can see the roof I am talking about to the right.
Second is inside the attic showing how the rafters are.

Thanks for any input..

 

[Broncoman75]

Well I think you could do what you are saying, but it looks like there are a few issues with your plan that you would need to figure out.
1) looks like your AC fan will need to be moved and the dryer vent. Not sure if there is anything else going on in that corner (what is the white pipe coming out?)
2) in your first photo of the back of the house it looks like you have those 4 trusses and about 8' of a room above where you are talking about extending toward the rear correct? you will need a beam/header to support the above if you are taking the back wall of the garage out.
3) I don't see why your idea of cutting the truss tails off wouldn't work, but you either will have a shallow roof pitch than the rest of your roof, to make the top go under the upstairs windows, or you will have to have a shorter outside wall for your rafters to sit on..
is this what you are thinking?
<a href="http://s426.photobucket.com/user/Broncoman75/media/photo_zps57613847.jpg.html" target="_blank"><img src="http://i426.photobucket.com/albums/pp343/Broncoman75/photo_zps57613847.jpg" border="0" alt=" photo photo_zps57613847.jpg"/></a>

 

[ludakris04]

yes, the A/C, Furnace intake, and sump pump outlet, will be moved to the end of the wall. The garage will stop where the 4' bump out starts.
There will be a beam of some sort in that wall to support the upper room.
But that is what I am thinking, with a shallow pitch roof. I have thought possibly a metal roof because of the pitch, but would prefer shingles to match.
Instead of trusses for the roof I was thinking 2x10 or 2x12's

 

[finn]

You need room beneath the bedroom windows or moisture will infiltrate and rot the frame. That reduces the slope, which causes other issues.

My personal opinion is that what you are proposing will screw up the aesthetics of a nice suburban house and screw up the resale value. I doubt you will get a permit, either.

If your heart is set on a shop, consider moving.

I went through this dilemma myself.

 

[akpolaris]

you will need to vent that roof somehow of will have mildew. your plan looks like it will result in a valley where the present roof connects. Also getting those windows flashed may be problematic.

 

[DekeT]

You need room beneath the bedroom windows or moisture will infiltrate and rot the frame. That reduces the slope, which causes other issues.

My personal opinion is that what you are proposing will screw up the aesthetics of a nice suburban house and screw up the resale value. I doubt you will get a permit, either.

If your heart is set on a shop, consider moving.

I went through this dilemma myself.

Agreed, this plan does not even look good on paper.

 

[Daniel Dudley]

If you give yourself 4'' under the window, it should work. I have certainly seen worse. You can run a shallow pitch like that no problem. You just can't use asphalt shingles.

 

[ludakris04]

If you see that other roof coming off the back, there are already widows above that, no problem. My question was basically about the truss tails. The garage will be 16' wide. I think I can get a 2.5:12 or 3:12 pitch if I go a little shorter on the outside wall. Currently it's almost 11' tall.
As far as aesthetics, there is an optional study that can go there (18x10), so it's not too far off. Also I have no neighbors behind, and side won't see it either.



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[Broncoman75]

If you see that other roof coming off the back, there are already widows above that, no problem. My question was basically about the truss tails. The garage will be 16' wide. I think I can get a 2.5:12 or 3:12 pitch if I go a little shorter on the outside wall. Currently it's almost 11' tall.
As far as aesthetics, there is an optional study that can go there (18x10), so it's not too far off. Also I have no neighbors behind, and side won't see it either.



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regarding cutting off the truss tails, yes you could do that to do what you are thinking of, but we are all trying to warn you that it could lead to less than desirable consequences.. Like how you tie the small roof on the right into the one you are proposing to add? if you do shingles you might get away with ice and water shield over the new roof + in the valley where it meets the existing but you should check with the codes in your area. If you want to do a metal roof I don't know how you would address the above issue.

Here is an idea, are you an a subdivision where you can drive by another house like yours that has the study option you mention? Look at how they did it maybe it will give you some ideas to go off of.

 

[mygarageone]

I would think , you local permitting agency and plan review will have the final say on this issue .
Best check with them first .
And if your builder does what you want and you have problems later , who are you going to blame ?