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Old 10-12-2017, 08:20 AM  
nealtw
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The symptom is concrete missing. replacing it may not solve the problem.


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Old 10-12-2017, 08:34 AM  
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The symptom is concrete missing. replacing it may not solve the problem.
It is a pretty thin coating of concrete over wood. I suspect it cracked and water got in and popped the concrete off the wood as water swelled the wood.

A concrete patch is probably going to be a short-term fix if the wood is starting to fail from moisture. How short term, is anyone's guess.

I'd want a thicker layer of concrete with something separating the wood from the concrete. Or I'd use metal under the concrete instead of wood. Still, I'd want 4" of concrete. Or long-term, I'd rebuild it with composite decking.


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Old 10-12-2017, 09:07 AM  
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It is a pretty thin coating of concrete over wood. I suspect it cracked and water got in and popped the concrete off the wood as water swelled the wood.

A concrete patch is probably going to be a short-term fix if the wood is starting to fail from moisture. How short term, is anyone's guess.

I'd want a thicker layer of concrete with something separating the wood from the concrete. Or I'd use metal under the concrete instead of wood. Still, I'd want 4" of concrete. Or long-term, I'd rebuild it with composite decking.
The deck is exposed to weather is what it looks like so a new deck should be 6 inches below the floor and 3 1/2" of concrete. So the structure is 10" below floor level
36" wide peel and stick under the concrete and up the wall

We built them with a drip edge too to save the wood from getting wet.
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Old 10-12-2017, 09:41 AM  
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At some point, this thing needs to be torn off and rebuilt. Without a roof over it, water is going to splash on the door.
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Old 10-12-2017, 02:17 PM  
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Can you please explain what do you mean when you say you "flash" them?
Please excuse the delay as I am a DAV and had to attend to some med. needs at the VA.

Different from the general method of flashing, I use a 3"x3" bonderized flashing where the plywood intersects the wall over a urethane caulk tooled both up the wall and on the plywood and back over the flashing on the plywood plain, the base membrane (expanded metal lath, fiberglass or mesh) is placed and attached over the plywood, the cementatious product is mixed, placed and tooled, and usually dries to foot traffic in 1-4hrs.

Another bead of Urethane is applied at the deck to wall intersection and around any deck protrusions and penetrations.

Sealed, waterproof and elastomeric.
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Old 10-12-2017, 02:21 PM  
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Thanks for the image. I now understand. The piece that broke off is away from the wall. I was just thinking of saw cutting around the area and put some quickcrete, may be around couple of square feet. And then may be apply a seal on the whole deck.
The plywood is clearly damaged and should be replaced.

The cut and patch method will leave a cold joint and a leak.
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Old 10-12-2017, 02:40 PM  
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How did this break, something hit it or wood movement.
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Old 10-12-2017, 03:19 PM  
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How did this break, something hit it or wood movement.
Not sure. Probably the tenant dropped something like a furniture or heavy stuff that caused the crack. Water seeping through the crack made the plywood swell up. Just guessing.

Thanks.
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Old 10-13-2017, 10:17 AM  
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Not knowing your general location may lead to different answers. Climate in NJ, CA, & Vancouver will probably require different approaches.
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Old 10-13-2017, 12:14 PM  
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Not knowing your general location may lead to different answers. Climate in NJ, CA, & Vancouver will probably require different approaches.
It's in Louisiana.

Thanks.


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