Below 40 f shingles are brittle and crack easily when hammered or bent.
Roof asphalt shingle installation.
Although placing new roofing over old may be allowed by some codes roofovers tend to be inferior and won t last as long as a roof installed over stripped sheathing.
To install asphalt shingles start by installing underlayment and new flashing on the roof.
Use your chalk and tape measure to mark about 12 inches up on the roof for the first set of shingles.
Once you ve done that cut your shingles to size if they re not already.
Continue to chalk additional guidelines based on the width of the shingle through at least four courses rows across the roof.
Starting at the bottom of the roof map out a guideline with chalk.
While the asphalt shingles will be the primary water shedding roof layer there are many benefits to installing a roof underlayment.
Then begin nailing the shingles to the roof working in rows and starting at the edge of the roof.
Installation temperature requirements for asphalt shingle roofs ideally shingles should be installed at temperatures ranging from 40 f to 85 f.