60 year old ranch house. Looking to extend the main roofline to make a 2x2 four car garage, at 90 degrees from the main roofline. No other option by space for an entirely free standing garage in another area. Could separate them slightly, at best, but code is for it to be attached in that event as well.

Using an architect and structural engineer, so they "should" think of everything and answer every question. I'm concerned about tying a new structure into an existing, well settled structure and how we can keep the old and new roof together, smooth and even.

How old is the existing roof and do you plan on replacing?

You may want to make the new garage roof higher or lower than the house to create two separate roofs. This can eliminate and seams and blending of shingles without adding the cost to put a new roof on the house.

Wild Ass Guess (WAG): Unless you tie the new foundation into the existing foundation your carport roof will move at the whim of the earth underneath it. This will be especially true if you live in an area where the ground freezes.

And that’s why the Professional Engineer (PE) gets paid the big bucks.

Yes, planning on replacing entire roof, as that also has renewed areas of rot.

I'll be sure to quiz them on the freeze/thaw cycle.

quote:

Originally posted by gpbst3:
How old is the existing roof and do you plan on replacing?

You may want to make the new garage roof higher or lower than the house to create two separate roofs. This can eliminate and seams and blending of shingles without adding the cost to put a new roof on the house.

I have no clue about structural engineering but this idea would be great so you can have some height to the garage and install a 4 post lift for me to rent some space for my GTO if you don’t have a full extra bay.
I am flat out of space and miss a working space in the garage. My back pad has zero shade, is an absolute wind tunnel, and have to jockey 3 trucks around if I am to do any work but sure beats nowhere to work.

All kidding aside looking forward to this project. Lots of renovations and add ons lately over in your area that are really creative.

quote:

Originally posted by gpbst3:

You may want to make the new garage roof higher or lower than the house to create two separate roofs.....

I agree. I did this when building my shop which is 38' wide plus 18' for the carport for two reasons. First a 60' long straight roof is kind of unattractive IMO. Second the terrain naturally sloped down hill to the right. Good luck on your project keep us updated.

Just did a project with this -https://www.skylifthardware.com/ - Used 4x12x16 -Not sure if it meets your application.
Good Luck

quote:

Using an architect and structural engineer, so they "should" think of everything and answer every question.

I'd let the experts do their job and not worry too much about it. This type of addition is pretty common. I've not seen any issues crop up in similar situations if done by competent people... We don't have a deep frost line here though.

Did it on my home. Foot print changed from am “L”to a “T”. Ridge of addition intersected original ridge at 90*. Full basement under both. A good foundation is obviously the best solution.

Your footings will be deeper than the frost line, whatever that may be in your area. That will prevent freeze/thaw movement wrt the house being connected to the addition. Here in UT that depth is min 32”