Remove the cover and then nail the old shingles back down again.
How to lay shingles over an existing roof.
Doing it now will make it easier to keep the reroofing job clean.
If you nick or tear the old flashing piece then go buy a new one.
Use the chalk line to mark the line at that spot across the roof.
Use your chalk and tape measure to mark about 12 inches up on the roof for the first set of shingles.
Continue marking lines every five inches up to the roof ridge.
You re better off removing the old roof.
How to do it.
The uncut shingle should hang a quarter of an inch over the roof edge.
You need to tear off the roof and install a new one.
But if the current roof is curling this isn t possible.
Repeat this on both sides of the roof.
We discuss the nesting method which helps minimize an uneven appear.
How to install a roof over an existing roof determine the feasibility.
In this video we provide details on how to install roof shingles over existing shingles.
Remove the ridge caps.
Every 5 inches make a new mark until you get to the rop of the roof.
Use a flat pry bar or roofing shovel to pry.
Install new shingles to the lower edge of the opening.
Position one of the uncut shingles on top of a trimmed shingle.
Use the chalk line to snap a straight line vertically every 6 inches.
The condition of the existing roof is critical.
Cut the existing shingles and pry up carefully.
Mark the location of the top of the uncut shingle on the felt.
So if there are already two layers the choice is made for you.
Current shingles are curling or in bad shape the new shingle roof should lay flat on your old one.