Rain, wind, and snow can do serious damage to a roof. If your roof has not received attention recently, it may contain shingles that are cracked or worn and may even be missing some shingles. If you do not need a new roof yet, replace the missing or damaged shingles to protect your home and pay less than having a professional do it.
You will need:
Step 1: Loosen the set of shingles that rest just above any damaged shingles, using the putty knife and pry bar to pry these apart from the damaged shingles.
Step 2: Gently remove damaged shingles by rocking them back and forth.
Step 3: Lift the edge of the good shingle and remove nails from the exterior of your roof with the pry bar. Put the wood under this tool to keep from damaging any nearby shingles. If you are unable to remove a nail, pound it in with the hammer so the nail head is flush with your roof.
Step 4: Cover the nail heads that were hammered flush, using the roofing cement, caulk gun, and putty knife. Between each shingle and the wooden frame of the roof is a felt layer. Apply a thin layer of roofing cement to all rips in the felt. Remove excess cement with the rag.
Step 5: Start with the lowest shingle that requires replacement. Align the new shingle with those above it. Use the hammer and galvanized nails to attach this shingle. The general rule is to use four nails per asphalt shingle but refer to the shingle manufacturer instructions for further information. Put the nails ¾- inch higher than the tabs on the shingle. Repeat this step for each shingle that requires replacement, until reaching the final set.
Step 6: Find the shingle directly above the last one requiring replacement and pry its edge up with the pry bar. Slide a new shingle into place over the damaged one and secure it with the hammer and nails. Place a small amount of roofing cement where the new and old shingles meet. Each shingle has a cement strip but the roofing cement offers additional adhesion.