Materials and Installation Methods
Materials and Installation Methods
This domain tests how finish materials are selected, prepared, and installed so they perform in service. It covers substrates, moisture and pH testing, adhesives, tile, resilient flooring, ceilings, and expansion joints.
Core rules
- Substrates must be clean, sound, flat, and within the manufacturer's tolerance. Concrete slabs require moisture testing before resilient or adhesive-installed finishes; common tests are ASTM F1869 (calcium chloride) and ASTM F2170 (in-situ relative humidity).
- Many resilient flooring manufacturers require MVER at or below 3 lb per 1,000 ft² per 24 h by ASTM F1869, or a specific RH limit by ASTM F2170. Always use the manufacturer's stated limit and test method.
- Tile installation follows ANSI A108 and the TCNA Handbook. Movement joints are required at perimeters, over structural joints, and at large field areas; grout alone does not accommodate movement.
- Adhesives must match the substrate, the finish, and the service conditions. Wet areas need waterproofing and a suitable mortar; organic adhesive is not a substitute.
- Acclimation, temperature, and ventilation during installation affect adhesion and dimensional stability.
Worked example
A 5 in. concrete slab on grade tests at 4.5 lb per 1,000 ft² per 24 h by ASTM F1869, and the resilient flooring manufacturer requires 3 lb or less. The slab is also 45 days old. The correct action is to reject installation, confirm the slab has a vapor retarder, and apply a manufacturer-approved epoxy moisture barrier, then retest. Installing the flooring with a standard adhesive risks adhesive degradation and blistering. The age of the slab alone does not prove dryness.
Traps
- Testing moisture before the slab has dried or before curing compounds are removed.
- Using a surface test instead of the specified method.
- Omitting movement joints at doorways and perimeters.
- Mixing adhesive brands or extending adhesive with water.