What Is Film Thickness?
Film Thickness is the depth of a coating layer after application or drying. Painters measure it to check whether the coating covers the surface as designed. In mass-timber intumescent work, film thickness helps confirm that the protective coating forms an even layer across exposed wood members.
Quick Facts About Film Thickness
Category
Coating measurement
Used for
Checking protective coating coverage
Common confusion
Wet thickness is not dry thickness
Also called
Coating thickness
Often discussed with
Mass-timber intumescent coating application
Key Takeaways About Film Thickness
- It describes coating depth, not surface color or sheen.
- The coating’s condition changes how thickness is checked.
- Wet and dry thickness are different measurements.
How Film Thickness Works
Film Thickness is checked while a coating is wet or after it dries. Wet film thickness shows the layer during application. Dry film thickness shows the remaining coating after curing.
Related glossary terms: Intumescent Coating, Surface Preparation, Paint Adhesion.
A painter checks the coating with a suitable gauge or inspection method. The reading can change across a wood beam because spray angle, surface texture, and application technique affect coverage. A consistent layer supports the coating’s intended performance.
For mass-timber projects, intumescent coating expands when exposed to high heat. The coating must cover exposed timber evenly, including edges, joints, and textured areas. The product data and project requirements guide the correct inspection method.
From the PainterSammamishwa.com team
When we apply intumescent coating to mass timber, we check the layer across broad faces, edges, and joints. We compare readings with the product requirements and look for thin spots, runs, or uneven coverage before the work moves forward.
Film Thickness in Practice: A Real-World Example
A mass-timber beam receives an intumescent coating during a building project in Sammamish. The crew checks film thickness across the beam and corrects areas that look thin or uneven before finishing the application.
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Related Terms
Intumescent Coating
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Surface Preparation
Surface Preparation is the cleaning, repair, and conditioning of a surface before paint or coating is…
Paint Adhesion
Paint Adhesion is the bond that keeps a paint film attached to a surface. Good adhesion…
Cure Time
Cure Time is the period a coating needs to harden through chemical drying and bonding. The…
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