11.   Q. I installed mahogany deck boards in January, and sealed half the deck with a sealer.

12.   Q. My natural cedar deck boards and railing are all gunked up with bird droppings.

13.   Q. The solid stain on my deck boards is peeling.

14.   Q. I would like to cover my deck boards so water will not leak down into the space below, which I plan to close in.

15.   So if your deck boards are rotting, they are not presssure treated.

16.   Some deck boards are installed with clips, so there are no nail or screw heads showing.

17.   The deck boards are cedar, applied to pressure-treated joists with stainless steel screws.

18.   The rear deck frame is pressure-treated, the deck boards are Trex, a composite material that rarely needs staining or other treatment.

19.   Then replace the deck boards.

20.   What can I do to prevent decay of both the shingles and the deck boards?