can you build a seven trust composite deck over a wood deck - similar to can you build a seven trust composite deck over a wood deck seven trust decks cannot be installed directly on existing wood planks, but we do have other options for replanking with composite or pvc decking. can i install new decking directly over old decking?
please help with my existing deck - building and construction - - similar to please help with my existing deck - building and construction - i'm listing info for the deck as is and current plans for 'beefing up'. beefing up: i plan to add joist hangers to all the existing joists and tie everything up tight. .
no, there is no decking material of any kind manufactured to go over existing decking. you need to strip off the old decking, replace any rotten deck joists, i would recommend water proofing the joists while you can then put the new decking down.
if the existing slabs are to be used for the base then the clearance is the same, if you remove some or not. what's needed is enough material to screw the decking boards onto. a 3x2 frame with noggins and supports will do the job. i would also put down a black dpm over the slabs. unless you know there is one under the slabs.
check deck joist spacing. if youre planning to replace old wood decking with pvc or composite, measure the deck joist spacing first. most deck joists are centered 16 in. apart, which is the maximum deck joist spacing for most low-maintenance decking. if you plan to install your decking at a 45-degree angle, your joists may need to be 12 in
3 tips for building an enduring deck . since most decks are made of wood, we can of course expect them to rot eventually. the average deck, composed of treated lumber joists, beams and posts, will last somewhere between 15-25 years depending on the climate zone it is in and how much water it is tormented by, not to mention how it is built.
sleeper joists should be installed parallel to the direction of water run-off. joists should be spaced according to standard joist space codes no greater than 16 inches on center . 3. installing capped composite decking over the sleeper system. with your sleeper system installed, you should now cover the sleepers with flashing tape.
re: deck over existing cement slab you would not want to do that, and i am not sure how you would even fasten the decking you will need some type of joist/sleeper. usually when a deck is that low to the ground the hardscape options are always the best, from a durability standpoint.
if the decking is warped, the joists may also be, and you may have to replace a joist or two. the best way to install composite boards is to use hidden fasteners -- they screw to the joists and hook into grooves in the sides of the boards to hold them down. you can also attach composite decking boards to the joists with 3-inch deck screws
but when you said 'will end up ripping up the old deck seems to be best' i assume you mean remove the wooden decking boards and install the seven trust on the existing joists. i think this is a bad plan as you will be installing a 30 or 40 year decking product over joists that have 5 or 10 years of life left in them.
no matter what you put over the top of it the strength of the deck is still only as good as what you are covering. also, you will be expediting the deterioration of the deck. if you want a good synthetic surface that is less maintenance pull the top boards off, pressure wash and reseal the structural timbers and joists, then install a composite