Commercial Building Inspector B2Floor ConstructionMedium
A commercial building inspector is reviewing the installation of a new resilient floor covering in a medical clinic's waiting area. The subfloor is a concrete slab. Which of the following is a critical factor to check regarding the concrete subfloor preparation before resilient flooring installation, as per industry standards?
- AThe concrete surface is free of moisture and contaminants.
- BThe surface is perfectly level with a tolerance of 1/32 inch in 10 feet.
- CThe concrete has been sealed with a vapor barrier primer.
- DThe concrete compressive strength is at least 4,000 psi.
Show answer & explanationAnswer & explanation
Correct answer: A. The concrete surface is free of moisture and contaminants.
Moisture in the concrete slab and surface contaminants are critical factors that can lead to adhesive failure, blistering, and other issues with resilient flooring. Ensuring a dry and clean surface is paramount for a successful installation.
Why the other options are wrong
- B. While levelness is important, the tolerance specified might be overly stringent for general resilient flooring and varies by product; a typical tolerance is 1/8 inch in 10 feet.
- C. While vapor barriers or moisture mitigation systems may be required, a 'vapor barrier primer' is not a universal requirement and depends on the specific product and moisture conditions; the focus is on addressing moisture, not just a specific product.
- D. While concrete strength is important structurally, 4,000 psi is not a specific requirement for resilient flooring adhesion; 2,500 psi is often sufficient.
Resilient Flooring Subfloor Prep
Key steps and conditions required for a concrete subfloor to ensure proper adhesion and performance of resilient floor coverings.
- Moisture control is paramount.
- Surface must be clean, dry, and smooth.
- Adhesive compatibility with subfloor and flooring is crucial.
Memory trick: For resilient floors, dry and clean means a happy sheen.