1.   A. The zinc strips are tucked under the second-to-top course of shingles, exposed several inches.

2.   A. The zinc strips were developed, I believe, in the South, where algae, moss, and mold are rampant.

3.   I was advised to install zinc strips.

4.   On the market are zinc strips that can be inserted under the highest layer of shingles on a roof.

5.   Rainwater runs down over this zinc strip, picks up minute particles of the mold-inhibiting metal, and spreads them over the roof.

6.   Q. Where can I find those zinc strips that you can put on a roof to keep mildew and algae from growing?

7.   Q. I found some zinc strips at a Home Depot and plan to put them on my roof to act as a preventer of mildew on the roof.

8.   Someone asked if such a zinc strip would deter mildew on a house wall.

9.   These zinc strips, some of which are called Mildew Guard, are sold in building supply stores, the Handyman said.

10.   They are held together in grooved lead or zinc strips called cames.