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Originally Posted by rfuerst911sc
Paul I just took a few pics I'm waiting for them to upload . DR no the deck does not have much pitch to it and I wouldn't expect it to . You want a flat surface to walk on , put furniture on and grills on . Isn't part of the reason for a gap along each board for water runoff ? Crowbob I hear what you are saying but I'm a stubborn person haha ! I'm thinking the wedge/s will NOT be made of wood they can be composite to virtually eliminate rot . And I want to have enough " pitch " for the majority of water that drips through the deck boards will run out vs. puddle . There will be no place for birds to get in , the house side and the two ends will be closed in . The open end I can install 1/8th " hardware cloth so plenty of ventilation and will keep large stuff out . Our house has gutters so nothing coming off the roof goes onto the deck . The nearest trees are 70 ' + away from the house in one year living here I have not seen one leaf or pine needle on our deck so I don't think there will be tons of debris going onto the ceiling . I do enjoy this discussion because it's possible I am crazy for this idea !
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It has some pitch probably 1/4" in 12" based on what it looks like in the photos. This is enough to get water to run off the deck and away from the house. The gaps are to get water to run off the decking and designed to fall to the ground. Again to your direct question, you can attach directly to the bottom of the joists. The pitch will allow the majority of the water run off. However friction will hold water in the area where the FG panels and joists are attached and the debris that falls through the gaps will also collect water and that will cause water to begin to stand. A little in the beginning and it will increase as time goes by.
Again, I am going to caution you. You already have a moisture/humidity problem. See the green slime? That is a high humidity issue. If you enclose the joists you are going to exponentially increase that problem. In the summer that will become a mold incubator.
Edit:, add a sleeper to the bottom of the joist so you clear the bridging.