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We are getting close to pouring, still installing drains and grading.

We are putting down 4" of CAB roadfill over the base soil (expansive soil) and will have rebar 24" OC. The question, is a 15mil. Vapor barrier worth installing over the fill before we pour? Or just pour the slab over the 4" of fill? The slab will be 4" thick 3500 psi concrete.

Also is the use of burlap to wet cure the deck worth the investment of time and $$?

Also, what is the best expansion material for where the slab meets the walls and the house? What's the best brand/type of mastic expansion material between the pool coping and slab.

Thx
 

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Concrete & Masonry
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We are getting close to pouring, still installing drains and grading.

We are putting down 4" of CAB roadfill over the base soil (expansive soil) and will have rebar 24" OC. The question, is a 15mil. Vapor barrier worth installing over the fill before we pour? Or just pour the slab over the 4" of fill? The slab will be 4" thick 3500 psi concrete.

I know of zero benefit in placing any kind of vapor barrier outside, but can come up with a handful of reasons not to.


Also is the use of burlap to wet cure the deck worth the investment of time and $$?

Is this going to be a decorative concrete slab? Stamped or colored? If not, a cheap water based curing sealant will suffice. If it is decorative, there are "temporary" sealer available that can either be reomoved or "wear" away in short fashion so they don't disturb the deco. concrete process.

Also, what is the best expansion material for where the slab meets the walls and the house? What's the best brand/type of mastic expansion material between the pool coping and slab.

Thx
We've never used anything for expansion joint at the coping, most rely on positive contact with the concrete to support them. Against other structures, you can either use rolled cellular felt like WR Meadows "Deck-o-Foam" or whatever recycled rubber material your local concrete supplier carries........
 
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