Attaching lean-to roof to existing barn

Old 05-14-13, 03:36 AM
Thread Starter
Join Date: Sep 2005
Location: USA
Posts: 125
Received 0 Upvotes on 0 Posts
Attaching lean-to roof to existing barn

This was originally posted in the garage/car port section but the discussion evolved into a roofing question. I want to add a lean-to shelter along the length of an existing barn. The best option, given the height involved, is to attach to the existing 12/12 barn roof. The barn is fairly new with laminated shingles.

The question I had was the procedure to shingle up the new lean-to and blend into the existing barn roof. I am guessing that I need to lift the shingles on the barn (without damaging them) and somehow make sure that my new shingling job terminates in exactly the right spot to go under the existing barn shingles. How would I accomplish this?

Old 05-14-13, 06:10 AM
Join Date: Feb 2006
Location: USA
Posts: 6,380
Received 63 Upvotes on 55 Posts
Lean to Roof

You have a challenge, but not impossible. The reveal on most shingles is around 5 inches. What is the reveal on your shingles?

Once you determine the exact reveal measurement, then the bottom edge of the first course on the new roof needs to be a multiple of that measurement from the bottom edge of the existing shingles.

You will need to remove the starter shingle on the existing roof so the last course of new shingles will lay flat.

The pros will follow.

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: