Adhesive Compatibility: Backings and Substrates

An adhesive is not a commodity. The correct product depends on what is on the back of the flooring, what the subfloor is, and how much moisture is present.

Know the backing

Different carpet and tile backings need different adhesive chemistries. Using an incompatible glue can mean a weak bond or plasticizer migration that discolors the flooring.

• Common backings include PVC, polyurethane, woven polypropylene (ActionBac), bitumen, latex unitary, and EVA
• Hard-surface products like LVT and LVP have their own requirements
• Always match the adhesive to the manufacturer-approved backing list

Know the subfloor and moisture

Moisture is the single most common cause of flooring failure. Concrete can release vapor on, above, or below grade, and the adhesive has to tolerate it.

• Subfloors — Concrete, wood, terrazzo, ceramic, and metal deck each behave differently
• Moisture limits — Check the adhesive rating against the slab RH and MVER
• Grade — On-, above-, and below-grade installs are not interchangeable

Pressure-sensitive vs. hard-set

A pressure-sensitive adhesive stays tacky so tiles can be lifted and replaced without losing bond — ideal for carpet tile and LVT. A hard-set adhesive creates a permanent bond for broadloom and the heaviest traffic.