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darsunt 12-29-2006 12:33 PM

deck drainage problem
I have some decks that have insufficient drainage during rains. They each have two drains in the corners, but I want to cut a third drain in the center.

This would involve cutting through the base of a stucco wall, and also cutting a shallow trench in the decking material. It looks like a relatively simple job, except for two things:

1) Someone told me it was a very bad idea to cut the fiberglass coating on the deck. Is it because this coating is very thin? Or does fiberglass deck coatings leak when ground down? I only want to remove about a quarter inch.

2) I'm not sure the proper tools to cut a hole in stucco ( I have masonry drills but I doin't think they'll be enough.


redline 12-29-2006 03:49 PM

Does the deck slant towards the drains.

darsunt 12-29-2006 10:18 PM

Yes, the deck does slant properly down towards the drains (out towards the outer balcony wall). But the drains are on the corners, while the deck floor has sunk down in the middle. So the water drains correctly outwards but a 1 inch + puddle builds up in the middle against the outer wall. So a third drain should do the trick, if feasible

Another problem is, thought the deck surface slopes down properly, right at the outer wall it starts sloping up again for about 4 inches.

jbob 12-30-2006 06:49 AM

Fiberglass deck coatings are very thin. only about 1/8 inch at most.
If you grind it at all, it will no longer be waterproof.

From your desciption, you seem to have a stucco wall at the outer
end of your balcony. If you want to cut a drainage hole (scupper)
in this wall, just put a masonry blade on a 4 inch grinder. It will
easily cut stucco.

If you cant get to the bottom of your balcony and raise the
plywood in the center, you may consider fiberglass filler to
generally fill the area to an even slope.

Good Luck:)

darsunt 12-30-2006 12:45 PM

Thanks for the tips. I think I will look at trying to raise the plywood underneath, and the fiberglass filler. Does anyone know of a good fiberglass filler product?

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