I've built new sloped concrete decks over membranes before, with many years of trouble free use, but this is a renovation of a flat wood deck.
This time, I'm thinking about putting a concrete surface on top of the existing cedar decking. The cedar is in pretty good shape, with just a few boards showing a bit of rot. The P.T. framing is in great condition.
The concrete would be poured in squares, 3 - 4 feet across, with 1/4" gaps between them on all sides. My thought is to put down #30 felt paper to protect the cedar, and wrap the edges down into 1/2" gaps cut into the decking in line with each edge of the concrete panels. In other words, this 1300 sq ft deck would have a concrete surface that has a grid of drainage channels at about 3 or 4 feet on center.
Is this any crazier than putting concrete tile roofing over #30 felt?
Pre-emptive comments: Yes, I know there are structural considerations for the weight, and details for water protection at the walls of the house. The height works because the deck is down 2 risers from the floor of the house, and the steps would also have new surfaces and reworked geometry for equal rise heights. I'm really just wondering about the long term prospects for the roofing paper and the cedar.
Gentle persons, please discuss.
This time, I'm thinking about putting a concrete surface on top of the existing cedar decking. The cedar is in pretty good shape, with just a few boards showing a bit of rot. The P.T. framing is in great condition.
The concrete would be poured in squares, 3 - 4 feet across, with 1/4" gaps between them on all sides. My thought is to put down #30 felt paper to protect the cedar, and wrap the edges down into 1/2" gaps cut into the decking in line with each edge of the concrete panels. In other words, this 1300 sq ft deck would have a concrete surface that has a grid of drainage channels at about 3 or 4 feet on center.
Is this any crazier than putting concrete tile roofing over #30 felt?
Pre-emptive comments: Yes, I know there are structural considerations for the weight, and details for water protection at the walls of the house. The height works because the deck is down 2 risers from the floor of the house, and the steps would also have new surfaces and reworked geometry for equal rise heights. I'm really just wondering about the long term prospects for the roofing paper and the cedar.
Gentle persons, please discuss.
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