How to Repair a Flat Asphalt Roof

What You'll Need
Utility knife
Measuring tape

Repairing a flat asphalt roof can be an easy task to accomplish. These roofs are saturated in liquid asphalt, and they don't have a steep pitch. They can easily be damaged by water but can be repaired by the homeowner, and this can save money. Read the steps below, to know what you are doing when repairing the roof, and take precautions to wear the necessary protection:

Step 1 - Measuring

Get your measuring tape and measure the damaged areas. This way, you will know exactly how much of the shingle to cut in order to have the best patch fit. Once this is done set the measuring tape to the side since it may be used at a later time.

Step 2 - Cutting Damaged Areas

Cut the damaged areas by using a sharp utility knife. Cut around the areas in a square shaped fashion, and make sure that all of the damage is removed. Also, be sure to wear work gloves while performing this task, to avoid any cuts or injury. The damage may have been caused by water, mold or other build up.

Step 3 - Removal

Remove the areas that have been cut out, and get your roofing cement in order. Take the roofing cement, and apply it on the area that held the damaged material. Also, force the roofing cement under the existing roofing. Use a putty knife to do this job.

Step 4 - Cutting New Patches

Take a sharp knife and cut a patch from a shingle. Make sure that the patch is the same size as the area that was removed previously.

Step 5 - Replacing

Take the new patch and apply it onto the area which held the removed damage. Press down firmly on the new patch, and let it bond with the cement. Give it a few minutes to work with the cement, to guarantee a tight fit. After this, take your hammer and nails, and firmly nail the edges of the shingle down. Take up the roofing cement again, and apply it over the top of the patch, to secure the bond. Smooth out the edges with the putty knife.

Step - 6 - Second patch

Pick up your utility knife and cut a second patch out of the shingle. This patch will be at least 2 inches larger on all sides than the first patch. Place the second patch over the first patch. Firmly press down on the second patch to make it bond with the first one.

Step - 7 - Final nailing

Once it has dried, hammer the nails into the edges of the second patch, to keep it firmly in its place. Cement the entire second patch with the roofing cement, and smooth out the edges again with the knife. Finally, let the new patches sit in place for a while, and then gently pull on them, to see that they are secured.