What goes on top, and how long it lasts
Waterborne or oil-modified, and what actually separates them
Two families of finish do almost all the residential floors in this region, and the choice between them is usually presented as a question of smell and drying time. Those are real but temporary. What lasts is color: an oil-modified polyurethane ambers the floor and keeps ambering for years, and a waterborne finish stays close to the color of the wood you approved on the sample.
- The federal ceiling that applies
- 450 grams of VOC per liter for varnishes (40 CFR Part 59, Subpart D, Table 1)
- Why that category and not 'floor coatings'
- A floor coating is defined as an OPAQUE coating. A clear floor finish is a varnish under the rule
- Oil-modified
- Ambers on application and keeps ambering with age and light
- Waterborne
- Stays close to the raw color of the wood, and stays there
- What both need
- Cure time after they are walkable. Walkable is not cured
- What decides for most people
- The species of the floor and whether anything has to match
The color difference is permanent, and it is the one that matters
Oil-modified polyurethane adds a warm amber cast the day it goes on and continues to deepen for years; waterborne finishes stay close to the color of the bare wood and stay there.
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Walkable is not cured, and the gap is where floors get damaged
Both families are walkable long before they are cured, and the finish keeps hardening for days or weeks after the room looks finished.
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Two dates, not one. Walkable is when you can use the room. Cured is when the floor stops being fragile.
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The species of the floor, whether anything has to match, and how long the house can be out of use decide it, and the sample is made from your own wood before anyone commits.
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Sources and references
- 40 CFR Part 59, Subpart D, Table 1, VOC content limits for architectural coatings. https://www.ecfr.gov/current/title-40/chapter-I/subchapter-C/part-59/subpart-D
- 40 CFR 59.402, VOC content limits. https://www.law.cornell.edu/cfr/text/40/59.402
- National Wood Flooring Association, finishing guidelines. https://nwfa.org/
Related work
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