Is there any reason to paint the underside of a deck?

Question

We have to replace a few pine boards on our deck and my son noticed that the underside of the deck was painted and now wants me to paint our three new boards. I have surplus deck paint, but I don't feel like doing something needlessly. I understand that it can't hurt, but can it help in any way or should I forgo this process?

Update:

Thanks. Will do. And will read other responses.

saaanen · Accepted Answer

It it not needless.  It does prolong the life of the boards.  Very few people do it, though.  Your choice.

If you do do it, the new boards will probably out last the old, now.

Hondu · Answer

Yes.  Rain water or snow melt will run down between the deck boards and cling to the bottom side.  Wood, even pressure treated wood, will resist dry rot if it is painted or sealed on all surfaces.  Pressure treating doesn't prevent rot, it simply delays it.

gas man · Answer

it is almost impossible to seal a board,,by painting the entire board u will make it into a vessel that holds any moisture that comes from a sm hole or scrape,best to let it dry as much as possible

? · Answer

It will protect the boards against water damage, and sealing all sides of the wood is important.

chris · Answer

If your not using pressure treated lumber you should seal it. If it is pressure treated don't worry about it.

Jack · Answer

yes, you should at least apply a sealer as not to get rot or fungus.

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Is there any reason to paint the underside of a deck?

6 Answers