LIBERTY EPOXYPHILADELPHIAWhy we won't coat your floor on the wrong day.
Some July mornings we measure a basement, pack up, and move the install. You deserve to know what we're measuring, and why the reschedule protects your floor instead of our schedule.
Epoxy needs the slab at least 5°F above the dew point. A cool below-grade floor in humid Philadelphia summer air can sit under that line, which coats the concrete in condensation you can't see or feel. Coat over it and the epoxy bonds to water instead of concrete. We measure slab temperature, air temperature, and humidity before we mix, and when the numbers say no, we reschedule.
The dew-point rule
Every surface has a temperature below which the air's moisture condenses onto it. That's the dew point, the same physics that sweats a cold beer glass in summer. The rule on a coating job: the slab must be at least 5°F above the dew point of the air around it. Any closer and an invisible film of condensation forms on the concrete, right where the bond needs to happen.
You can't see that film. The floor looks dry, feels dry, and takes the coating fine. The failure shows up later as blisters or a coating that lets go in sheets, because the epoxy cured against a layer of water.
Why Philly basements get caught
A below-grade slab holds the ground's temperature, which stays cool deep into summer. Philadelphia July air arrives thick with moisture. Cool slab, humid air: that combination puts the concrete below the dew point on exactly the days that feel like perfect working weather upstairs. This is why the humid-season basement job is where corner-cutters get burned, and why we walk in with a thermometer and a hygrometer before anyone opens a bucket.
What we check before we mix
- Slab temperature vs. dew point: at least 5°F of margin, measured, not guessed.
- Ambient humidity: under roughly 85%, per product spec.
- Product temperature windows: each system has a range, and we stay inside it.
- New concrete: a new pour waits at least 28 days, and 28 days is a minimum, not a green light. The slab has to be dry, and we check the slab, not the calendar.
When a reading fails, we move the date. It costs us a day of schedule. Coating over condensation would cost you the floor, and us the callback that follows it everywhere.
A contractor who reschedules around the dew point isn't being difficult. He's the one planning on a floor that is still tight in year ten.
Get your floor quoted.
Rather ask a person? Call the installer.
Free quote, same-day reply.
Get My Free Quote Call (267) 225-39895.0 on Google, every review five stars · Licensed PA HIC #128520 · Est. 1964