best glue for concrete

[bugstruck]

PL or LN construction adhesive should work. If the slab were vapor barriered beneath the concrete it's more likely to hold but tapcons or an angled case hard nail anchor (can't remember the name but I think Rawl made it). As for the vapor barrier I could make an equal or better case (depends the actual conditions) that letting it breath is better. Breathing is breathing though, so getting some air migration is required but may not be desired. Much easier if the sleeper depths are more along the size of typical joists. As for the PL on the marble. NEVER. That is an oil based product that wicks through natural stone. Some stones hide the migration to surface. Most don't. The only other hope is that it cures out before it bridges the thickness of the stone and LN would stand a better chance of that. How do I know? Short answer. Did the same thing as a youngster on a vanity top. Pulled it and trashed it.

 

[nickel plate]

Concrete is going to wick ground moisture. I don't like the idea of using petroleum based adhesives for concrete to wood. The PL product is a petroleum base subfloor adhesive-wood to wood. Find and use a water based adhesive. Your fasteners alone will hold everything in place and the adhesive will fill any voids and act as a buffer.

 

[radman1]

I have used PL. Love the stuff. Different formulas based on what you want to use it for. I have glued wood to cement. Later tried to remove the wood. The wood will crack, splinter and still stay stuck to the cement. I still like to use a few Tapcons or something else, should the glue fail. Lots of construction guys just use the adhesive but maybe I am a little too conservative.

IMHO, I would not use tar, silicone or caulk. Does not have the strength or strong adhesion.

 

[JB4310]

I still think the adhesive strength in this application is a non issue, adhesives are used in flooring to prevent creaking due to loose fit up and seasonal shrinking of the wood components and when fasteners start to loosen over time.

In this case I would put a high quality vapor barrier down first, caulk or seal the barrier around the perimeter, Then lay the sleepers down, maybe on that rolled sill foam insulation, if the floor is very uneven then a couple layers and fasten the wood down solid. instead of just screws, some heavier lags would really keep it in place for the long hall.
The kind of lags that you just drill through the wood the same size as the lag, then drill the concrete through the same hole and install the lag through the wood, so your not trying to line up pre drilled wood with installed lags.Powers Fasteners Or at least something like this http://www.powers.com/product_7204SD.html it would be better than regular Tapcons.

Glue the components from there up.

Ventilation would be nice, but might not be feasible, it would have to be able to allow air movement in each of the individual bays.

JB.

 

[herd]

tks JB, and everyone. good solid advice here. The fastener that I am using is a RamSet Redhead," extremely strong and heavy duty. I referred to it as a "Tapcon" but it is much more heavier duty, galvanied, and very sismilar to the Power Fasteners you referred to. YOu drill your hole 1/16'' less than the fastener's diameter, and rachet it in. The last turn is very tight and snug, in fact, I strain a bit on that last turn.

 

[yooperdave]

What exactly is 'PL'?

I know Urethane with adhere like grim death.

Yooper Dave

 

[Pops15]

What exactly is 'PL'?

I know Urethane with adhere like grim death.

Yooper Dave

Don't remember what it stands for but PL is a brand name of construction adhesive that is similar to Liquid Nails. I use it for drywall, subfloors and underlayment.

 

[GE222]

You could use a 2-part epoxy. Make sure the floor is clean and oil free.

The mechanical fasteners should be enough along with liquid nails.

 

[SpringHollow]

Definitely test for vapor as recommended. A good vapor barrier is usually critical.

Ken

 

[Danno1]

Don't remember what it stands for but PL is a brand name of construction adhesive that is similar to Liquid Nails. I use it for drywall, subfloors and underlayment.

PL400. It's another type of uethane. You'll find it anywhere on the same shelf as LNs. I also think it's better than LNs.


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