A paint season with edges
Exterior painting is a seasonal trade almost everywhere, and the edges of the season are where most trouble starts. Paint applied too cold may never cure properly; paint applied in midsummer heat can flash and lap. The National Weather Service publishes figures for Knoxville that mark both edges.
The National Weather Service's Knoxville climate page lists, as period-of-record figures, an average of 34 days a year with a high of 90°F or more and 68 days a year with a low of 32°F or less. Its climate normals for Knoxville, 1991–2020, give an average annual rainfall of 51.93 inches and an average annual snowfall of 4.6 inches.
Cold nights and curing
Those 68 days a year with a low at or below freezing matter less for the hours a crew is working than for the hours after it leaves. Many exterior latex paints list a minimum application temperature on the label, and the night that follows counts too: a coat that's still soft when frost or dew forms on it can lose adhesion or look blotchy. On a fall or early spring job, ask the painter:
- What minimum temperature does this paint's label give, for both air and surface?
- How late in the day will you stop on cool days?
- If a cold snap arrives, does the schedule slide, or do you switch products?
A painter who answers with the product label in hand is a good sign.
Hot days and lap marks
At the other edge sit the 34 days a year with a high of 90°F or more. On a hot wall, paint can dry before the next brush or roller pass blends into it, leaving visible laps. Crews deal with that by working in shade, painting smaller sections and keeping a wet edge. It's worth asking which walls they'll tackle at which time of day.
Rain and the drying window
An annual rainfall normal of 51.93 inches means rain is part of any exterior plan. Painting over damp wood traps water under the film; it comes out later as blisters or peeling. Before a crew primes bare wood, it should be dry to the touch and, ideally, checked with a moisture meter. Ask how long the house is left to dry after pressure washing, too, since washing adds water just before painting.
Preparation, wall by wall
A durable exterior job usually includes:
- Washing to remove dirt, chalk and any mildew
- Scraping loose paint back to a firm edge
- Sanding the edges so they don't telegraph through
- Replacing or repairing soft wood rather than painting it
- Caulking open joints and nail holes
- Spot priming bare wood and patches, or full priming where needed
When proposals differ, line them up against that list. Our exterior painting page explains each step, and paint sheens and finishes helps with choosing between flat, satin and gloss on siding and trim.
Indoors in winter
Interior work is the natural fit for the cold months. Rooms need to be warm enough for the paint to cure and ventilated enough for it to dry, so keep the heat on and expect the crew to ask about it. Drywall patches, cracked corners and stained ceilings take primer before color; the drywall repair and surface preparation guide covers what to expect.
Lead-safe work on older paint
On any house built before 1978, the old coats 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.
That means sheeting under the work area, collecting chips, avoiding open-flame burning and power sanding without dust control, and a careful cleanup. Ask a painter whether their firm holds RRP certification, and how they'll keep dust out of the rest of the house.
Next step
Ask for a callback and say what needs painting. We'll pass it to one independent local painter who serves Knoxville; they'll look at the surfaces and give you a written proposal. The pricing guide explains what will drive the number.