Concrete over wood @ exposed deck
Concrete over wood @ exposed deck
(OP)
Hi all!
What is everybody's detailing preference at a wood framed deck topped with concrete? The deck will be exposed to rain. I'm inclined to put a pressure treated plywood deck, waterpoofing membrane over that and then pour concrete. If the concrete is capped with a closure angle, due to concrete being porous, is there a chance of water pooling at the waterproofing membrane since it would have nowhere to drain?
The detail I'm thinking of going with is a 1 1/8" PT deck, a layer of felt paper, then topped with a concrete with integral waterproofing. Is this overkill for my situation? Please see attached detail.
What is everybody's detailing preference at a wood framed deck topped with concrete? The deck will be exposed to rain. I'm inclined to put a pressure treated plywood deck, waterpoofing membrane over that and then pour concrete. If the concrete is capped with a closure angle, due to concrete being porous, is there a chance of water pooling at the waterproofing membrane since it would have nowhere to drain?
The detail I'm thinking of going with is a 1 1/8" PT deck, a layer of felt paper, then topped with a concrete with integral waterproofing. Is this overkill for my situation? Please see attached detail.






RE: Concrete over wood @ exposed deck
Mike McCann, PE, SE (WA)
RE: Concrete over wood @ exposed deck
RE: Concrete over wood @ exposed deck
The detail is very poor - water will be trapped between the ply and concrete, and between the HSS and the ledger.
Take a look at the article at the link - Joe shows how to do it:
Link
Also, I'd be inclined to use precast pavers instead of concrete so repairs can be done with minimum fuss.
Regards,
DB
RE: Concrete over wood @ exposed deck
RE: Concrete over wood @ exposed deck
You'll could get water between the steel angle and the concrete. Ditch the angle and push the concrete out a few inches beyond the HSS.
I've seen architects detail an upside-down "V" notch in the bottom of the concrete to force water to drip there.
Do you have occupied and enclosed space below?
RE: Concrete over wood @ exposed deck
RE: Concrete over wood @ exposed deck
I've followed DBronson's link for detailing this situation. Concrete over wood framing stinks in general. How do you think the clients would react to specify concrete with integral waterproofing in addition to this detail (Hycrete). I have no idea how much this stuff costs. Revised detail is attached. Thanks msquared for ledger nailing depth advice.