It is a sign to replace the roof if your roof is more than 20 years old and most of the shingles are damaged or badly worn. However, if your roof is basically sound and is at a relatively shallow pitch that you're comfortable working on, the repairs can be handled independently. Generally, these are three most common ones shingle roof repair: replacing damaged shingles; gluing down a badly curled shingle, and repairing shingles that have cracked. It is highly recommended that always make roof repairs on a warm, dry afternoon. The reason is that the shingles will be suppler and less likely to crack. As on the roof is already a dangerous place, it is advised never climb onto a roof that's wet, icy or covered with morning dew.
Basically, to do this, you need to replace the whole thing of part of a shingle is missing. Firstly, it is better to check for any leftover shingles from the last time the roof was worked on, if you are luckily you may find some from the builder or the roofer who handled the job left some behind. Another alternative is to purchase a bundle at a home center or lumberyard ($15 to $20 per square—100 sq. ft.—of standard three-tab shingles). Choose the closest one whenever you cannot find suitable shingles.
The required tool for replacing a damaged shingle requires a flat pry bar, a utility knife, a hammer, and a handful of 11/4-in. roofing nails. Each shingle is initially secured with four nails; when the next shingle course above is installed, however, its nails also pass through the top edge of the shingles in the course below.
Begin removing the first row of nails by sliding the pry bar under the shingle immediately above the damaged one and smoothly lifting it to free it from the sealer strip. You'll see the first row of nails beneath.
Slip the pry bar under the damaged shingle and pry upward. Once the nail pops up about 1/4 in., remove the pry bar, press the shingle down and pull out the nail. Repeat this procedure for the remaining three nails. Then push the pry bar under the shingle straight above the damaged one and take out the second row of nails the same way. After yanking all eight nails, pull out the damaged shingle.
You may not be able to pry out the second row of nails without cracking a shingle if the existing shingles are brittle. In that case, tear out the damaged shingle and cut V-notches in the replacement to fit around the four nails. Slide the new shingle up into place and secure it with four nails.
Fix Curled Corners
The asphalt shingles corners often begin to curl downward or upward, as it gets older. You can forestall the inevitable curling by gluing down the curled section if you notice a shingle starting to curl.
Under the corner, use a caulking gun to apply a dab of roofing sealant (about $4 per 10-oz. tube). Weigh it down with a brick (right), and leave the weight in place for at least 24 hours until the sealant dries.
Repair Cracked Shingles
You don't have to replace a shingle is simply cracked or torn, the best way is just repaired it. Under the crack, the work starts by applying a thick bead of roofing sealant. Press the shingle down and apply a second bead of sealant on top of the crack. Then spread the sealant with a putty knife.
In order to camouflage the repaired cracked shingles, firstly check the gutter for an accumulation of colored granules that have washed down the roof from the shingles. Then gather some into a small cup and sprinkle them over the sealant to mask the repair.
In general, a single torn shingle or a small hole in flashing, you can usually handle with a little DIY experience and some basic tools. In other situations, it is necessary to call for a roofer's expertise, especially if you can't fix the problem quickly and completely. It is advisable to call a pro in as soon as possible because the water damage spreads quickly, even from a small leak. In this case, a licensed roofer is best when there are multiple leaks, that it cannot be fixed and managed. If the leak is wicking across framing members or along walls, making it difficult for to trace the actual source, it is the sign that you need to call professional to step in. Furthermore, if the repair you made is not holding. The leak entails significant damage to roofing surface or flashed areas. For the shingles roof repair, it can cost in average $750.