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Before a garage-floor coating: ask what the moisture test establishesNRMCA CIP28, 2017 technical background; current coating instructions and current test standards require project review

Before a garage-floor coating: ask what the moisture test establishes

Reviewed and updated September 24, 2026

Before a garage-floor coating: ask what the moisture test establishes

Have the installer identify the coating system's current moisture requirements and the test used to assess the slab against them. NRMCA explains that slab moisture can affect non-breathable coatings; a dry-looking surface is not a substitute for the required assessment.

Keep the review within safe limitsDo not drill or perform a homemade test as a substitute for the installer's documented assessment. Keep testing and product acceptance with appropriately qualified people.
Separate condition, intended use and project scope

Which situation best matches the project?

01

Start with the coating, not a generic pass number

Ask for the exact coating and its installation requirements before treating a test result as acceptance. This guide does not supply a universal moisture limit or a rule that all products use the same method.

02

Know what was measured

NRMCA distinguishes test methods and their limitations; it describes electronic meters as comparative survey tools. Ask which method was used, where and under what conditions, and whether the coating manufacturer accepts it for the installation decision.

03

Ask what happens if requirements are not met

Request an explanation of the unresolved condition and the proposed next step before coating. NRMCA discusses manufacturer-approved moisture-mitigation options, but that does not select a system for your slab or guarantee a warranty.

Safe observation

Information to prepare

What to record
  1. Exact coating system and manufacturer requirements
  2. Test method, date and location record
  3. Known slab history and available vapor-retarder records
  4. Written response to results outside the product's requirements
Move from information to action

Who is the useful next contact?

The coating installer and coating manufacturer's technical support

You are deciding the proposed work or interpreting the observed condition.

Professional help

Use this guide to prepare for a qualified local professional.

Call Home Help does not currently have a verified phone connection for this service. We will not ask for a ZIP code or show a number until the campaign fields, endpoint and current routing conditions have been checked.

Phone connection not currently available

Check licensing, service area, schedule, scope and written estimate directly with professionals you consider.

Sources and boundaries

What supports this guide?

The captured guide's older numerical thresholds and test timings are not used as current instructions.

No installation date, warranty, moisture source or future coating performance is guaranteed.