Re: Still trying to waterproof area below my Deck
- From: "J. Clarke" <jclarke.usenet@xxxxxxxxxxxxxxxx>
- Date: Sun, 06 Aug 2006 19:09:58 -0400
Tom H wrote:
I have found a couple of under deck methods of channeling water from a
deck but they all go under the deck boards or joists.
This won't work for my application.
Earlier I posted a possible way to water waterproof under a deck by
cutting spline pockets into the edges of composite deck board and using
silicone to
seal the splines. A friend suggested using space ball (used to keep door
panels from rattling) to keep the spline centered and allow for expansion.
Another suggestion was to cut a piece of vinyl siding 'J' channel into a
'U' channel with the top two bars of the 'U' about 1/2" long.
Then making a table saw cut into both sides of the bottom of each deck
board about 1/2" deep and 3/8" in from the edge.
As each board is installed, silicone would be inserted into each saw cut
then inserting the 'U' channel.
Water would fall between the deck boards and be channeled off the deck
through the 'U' channel.
I would use an under deck fastening system to secure the deck boards.
Does anyone think either of these methods would work?
Any method other than building a proper roof under the deck is going to be a
kluge--if it works reliably then you may have come upon a new building
method that will eventually get into the codes, if it doesn't, well, then
you have to try something else.
The way that a boat is waterproofed is to cut the seams v-shaped and pound
in some caulking then cover that with caulking compound. This leaks a
little until the wood swells, then it is pretty much watertight. Trouble
is that when it dries out it leaks again and the caulking has to be
replaced periodically. With synthetic lumber and flexible sealants that
_might_ work as a long term solution in your application or might not.
With your U channel you need to figure out how you are going to clean it and
what is going to happen when it gets clogged and how you are going to fix
it when a hole gets knocked in it and make sure that it has enough carrying
capacity for the worst-case rainfall in your area. In an ideal world some
cup in the boards and sloping them a little would be a good idea so that
most of the rainfall is carried down the center of the board instead of
being channeled into the cracks.
--
--John
to email, dial "usenet" and validate
(was jclarke at eye bee em dot net)
.
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