Three numbers that shape a Chattanooga paint schedule
Most bad exterior paint jobs aren't caused by bad paint. They come from paint that went on at the wrong moment: onto a damp board, under a midday sun that skinned it over too fast, or a few hours before a storm. NOAA publishes three figures for Chattanooga that help explain why timing gets so much attention there.
- Muggy hours. In an average year at Chattanooga, NOAA counts about 894 hours with the wet-bulb temperature at 73°F or higher.
- Hot days. NOAA's climate normals for Chattanooga Lovell Airport show an average of 57.8 days a year reaching 90°F or higher, 47.5 of them in June through August.
- Rain days. The same normals show measurable precipitation on an average of 122.7 days a year.
None of these is a forecast. Together they describe the conditions a crew plans around and a coating has to tolerate.
Hot afternoons and the "too fast" problem
Latex paint dries as its water evaporates. On a hot wall in full sun, the surface can dry before the paint has had time to level and grip, leaving lap marks and a weaker film. With most of those 90°F days falling in June through August, careful painters in summer often follow the shade around the house: the east side in the afternoon, the west side in the morning. If a proposal is silent about scheduling, ask how the crew handles a sun-baked south wall.
Muggy air and the "too slow" problem
The opposite trouble comes from damp, heavy air. Paint dries slowly, dew settles on the film in the evening, and the surface can stay tacky. Some latex paints show a brownish streaking called surfactant leaching when moisture hits them too soon; it usually washes off but looks alarming. Ask the painter what time of day they stop applying exterior paint so the coat has time to set before evening.
Mildew comes before the brush
Warm, damp hours suit mildew. Painting over it doesn't kill it; it grows back through the new coat. A sound exterior job starts with washing, and where there's mildew, treating it and rinsing before anything else. A proposal should say which cleaner is used, whether the house is pressure washed or hand washed, and how long the siding dries afterward before priming. Our exterior painting page covers this step in more depth.
Working around rain days
Measurable precipitation on an average of 122.7 days a year means a painting schedule needs slack. Wood that's been rained on needs to dry before it takes primer or paint. Ask the painter how they decide a surface is dry enough, whether they use a moisture meter on bare wood, and what happens to the start date if a wet week arrives.
Inside the house
Interior painting is less weather-bound, but humidity still slows drying and recoat times indoors. Running the air conditioning and keeping the room ventilated helps. Bathrooms and laundry rooms deserve a paint made for damp rooms and, where there are mildew spots, cleaning and a stain-blocking primer first. See interior painting and paint sheens and finishes.
Pre-1978 homes
If your home was built before 1978, the old paint may contain lead. Under EPA's Renovation, Repair and Painting Rule, anyone paid to do work that disturbs paint in homes, childcare facilities and preschools built before 1978 must hold RRP certification, firms included, even sole proprietorships, and their workers must be trained in lead-safe work practices. It's fair to ask a painter whether their firm holds RRP certification, and to ask how they'll contain dust and chips while scraping.
Questions worth asking
- Which sides of the house get painted at which time of day?
- How is mildew treated, and how long does the siding dry after washing?
- Which primer goes on bare wood, and which on patched spots?
- What's the plan if rain arrives mid-job?
- Which paint, which sheen and how many coats on each surface?
For what drives the price of all this, read the pricing guide. When you're ready, request a callback: one independent painter working in Chattanooga gets your details and contacts you directly.