1.   All new shingle roofs need sun to melt the tar between the layers and make them stick together.

2.   And with new shingles and no nearby trees, the lichen is less likely to grow.

3.   As a rule, such a project involves ripping everything off and putting up all new shingles.

4.   A contractor suggested putting up new shingles.

5.   A. The added weight of the new shingles might increase the bow.

6.   After these nails are cut off you will be able to slide out the damaged shingle, then tap a new shingle up in its place.

7.   But if you do not do all the house, you will want the new shingles to match the old.

8.   Cut the new shingles at the top to make them butt up against the bottom of the fourth row.

9.   Eventually, Freeman said, he would like every house to be equipped with new solar shingles, which look like conventional shingles but generate electricity.

10.   Finish the job by dabbing roofing cement under the new shingle.