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walkereng, Consultant
Category: Structural Engineering
Satisfied Customers: 2446
Experience:  Over 30 years of Structural Engineering experience.
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# Shingling a roof. The roof isn't square. How do I lay

### Customer Question

Shingling a roof. The roof isn't square. How do I lay straight chalk lines?
Submitted: 8 months ago.
Category: Structural Engineering
Expert:  walkereng replied 8 months ago.

I can help

Customer: replied 8 months ago.
Hi
Expert:  walkereng replied 8 months ago.

Off course, you have to start at the eave of your roof with your shingles and lay out your chalk lines parallel to your eave and work your way to the ridge.

Any un-squareness will have to be taken into consideration at the ridge, when you put the ridge caps shingles on.

Customer: replied 8 months ago.
Don't my chalk lines need to be square?
Expert:  walkereng replied 8 months ago.

Your chalk lines will be square with the your starting point, the eave, and will be square to each other all the way up to the ridge.

The only part that will not be square is your last chalk line relative to your roof ridge.

Customer: replied 8 months ago.
This roof isn't square. I was going to measure the ridge then divide by 2. Then measure the roof at the eves and divide by2 then snap a chalk line then using a t square to snap a chalk line parallel to the ridge
Customer: replied 8 months ago.
Then start the 6" chalk lines
Expert:  walkereng replied 8 months ago.

You really just need keep the horizontal chalk lines parallel to your eave and the trim the edges as you go.

I guess I do not know the actual extent of the roof not being square, can you give me an idea?

Customer: replied 8 months ago.
I'll take measurements
Expert:  walkereng replied 8 months ago.

Ok, let me know. No hurry.

Expert:  walkereng replied 8 months ago.

Let me know when you come back online.