If properly prepared, peel and stick flooring can be installed over concrete subfloor.
Concrete and Moisture
• The surface must be smooth, clean, dry and free from dust.
• Concrete floors must have polyethylene plastic film moisture barrier installed between the concrete and the ground.
•It is highly recommended that proper moisture tests be carried out on any slab. Although there are several methods that can be used, a (RH) Relative Humidity or calcium chloride method is preferred. Calcium Chloride test results should not exceed 3 lbs per 1,000 sq. ft. in 24hours.
• Peel and Stick planks are water-proof, however high subfloor moisture or flood mopping can adversely affect the glue bond.
• Peel and Stick planks should not be installed on concrete floors where there is danger of hydrostatic pressure or water seepage.
• All cracks in the concrete should be filed with a latex Portland cement-based patching compound. Patching areas need to be primed when dried. (Do not use gypsum-based patching compounds.)
• Old adhesives from a previous installation should be removed by scraping before the new vinyl is installed.
• Peel and Stick planks are not recommend for use over black asphalt cutback adhesives or over light-weight Gypcrete.
Answered on 1/3/2017 by Tech & Install