Deck over asphalt

Old 07-15-06, 08:21 PM
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Deck over asphalt

I am looking to build a 16' x 16' deck over asphalt. I have 22" from the bottom of my patio doors to the ground. I would prefer to NOT drill pilings. I was thinking of making a 24" x 8' step attatched to the house under the patio doors. I was then going to make the deck a freestanding slab to be placed onto sidewalk blocks or composite boards to prevent the joists from sitting on the ground and rotting. I realize the deck may have to be shimmed to level it but I thought this would be easier than posts or girder/beam due to the low height.

Any thoughts on the step attached to the house? How big can it be just hanging off the side with no ground support? Is a ledger and joist hangers using 2x8s enough?

How about the deck? I was thinking 2x8 with 6" deck boards, all pressure treated. I am new to this, so any and all advise is welcome.
Old 07-16-06, 08:29 PM
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Location: Arlington, WA
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Whatever landing you put outside of the patio doors has to be a MINIMUM 3' X 3'. (24" isn't wide enough to meet code.) Making that free-standing isn't difficult -- you just need to cut hole in the asphalt for the footings, pour concrete footings with Simpson PBS's embedded in the top and set the posts in the bases.

The deck is the same thing -- cut the asphalt and pour footings, with more of the PBS's for the posts of the deck to set in. The footings will be 16" square and a minimum 12" deep -- deeper if frost is an issue.

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