Sealing Sub Floors

You normally only seal sub-floors for solid hardwood or bamboo , i use Mapai WFM or Bostik MVP . I offer to seal the floors with sealcrete for engineered floors, you can buy it at Sherwin Williams & Kelly Moore . Home depot or Lowes might still sell it.

Sealcrete works well for engineered floors if you have a low to medium moisture content in your sub-floor and want a little insurance.

Mapai will guarantee the floor from failing for 10 years with a moisture reading up to 8 if you use their WFM sealer with new trowels.

I always seal a slab with two coats no matter what is going down. It's really cheap insurance.

Make sure that your cust. knows this, it will set you apart from other bids.

The engineered wood itself is not resistant, but the 6 mil poly you put down before the pad is.

Do you mean a sealer or a vapor retarder?

Teetorbilt said:

I always seal a slab with two coats no matter what is going down. It's really cheap insurance.

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What sealer do you use?

I have always a DPM of one form or another on crete floors when installing wood, (type of dpm changes with type of installation ect)

In 25 yrs never had a problem due to moisture except in one job

(friends house) road construction outside his house six months after install cracked all his floors, lots of mositure built up under the DPM sheet to the point it worked its way to the sides and back over the top of the DPM sheet and soaked into the laminate. when we took the floor up to find the cause we had to mop the floors, good job we still had our meter readings from prior to install to prove it was dry. never seen mositure like that before, two years later he is still trying to sort it out with the construction company.