How do I measure my roof?

Old 01-23-02, 10:39 AM
Visiting Guest
Posts: n/a
How do I measure my roof?

How do I measure my roof? It is 15'3" to the point on two sides; 16' on a third side; then we have an add on roof on the fourth side. The fourth side is only showing Eight feet of its roof. The add on's measuerments are 11'6" on all three sides and the top ridge is 14'6".

How do I measure these triangle shapes? How do I calculate how many bundles of shingles to buy? What is a square?
Old 01-24-02, 07:48 AM
Mike Swearingen's Avatar
Banned. Rule And/Or Policy Violation
Join Date: Dec 1999
Location: Northeastern NC On The Albemarle Sound
Posts: 10,701
Upvotes: 0
Received 1 Upvote on 1 Post

A roofing square is 100 square feet, or a 10' X 10' area.
Depending on the shingles, there may be three to five bundles per square.
The easy way to get the square footage of a triangle is to measure the two longest sides, and multiply length X width (which will give you a square or rectangle, or double the triangle) divided by 2.
For instance, 16' X 15.25' = 244 Sq. Ft./2= 122 Sq. Ft. or 1-1/4 squares of shingles.
The add-on roof, if I understand you, is 11.5' X 16.5' or 190 Sq. Ft., or two squares of shingles.
Always allow about 10% extra for trim and waste when buying shingles.
Good Luck!

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