Replacing windows in Modesto
Modesto sits in the San Joaquin Valley, and valley weather asks two different things of windows: keeping summer heat out, and handling cool, damp winters without condensation and drafts. The valley's air adds a third consideration: keeping dust outside.
Fog and condensation
Modesto is in the part of the valley where winter tule fog forms on calm nights after rain and is usually thickest just before dawn. Cool, saturated mornings bring condensation on cold glass, particularly on single-pane or aluminum-framed windows. Water that runs down the glass onto a wood sill day after day is a common cause of rot. Double-pane glass with warm-edge spacers and frames that don't conduct cold resist interior condensation better. If the old sills are soft or stained, ask the contractor to probe them and consider full-frame replacement where the frame is damaged.
Dust and air sealing
Stanislaus County is part of the San Joaquin Valley area that the EPA has designated nonattainment for federal fine-particle (PM2.5) air quality standards. Old windows that rattle and leak let in outdoor air and the dust that comes with it. Windows that seal tightly when closed, and installation that insulates and air-seals the gap between the window and the wall, help keep dust outside. Casements and awnings press the sash against the weatherstripping and generally seal tightly. Ask how the contractor will seal around each window.
Summer heat
Valley summers are hot, and west-facing windows take the brunt of the afternoon sun. A lower solar heat gain coefficient on those windows can help keep rooms cooler. Ask the contractor to recommend glass for each side of the house.
Ranch homes and sliders
Single-story ranch houses often have wide sliding windows and sliding patio doors. Sliders are easy to use in wide openings. Ask about the quality of the rollers, locks and weatherstripping, which decide how well a slider seals and how long it slides smoothly.
Older homes
If the house was built before 1978, lead-safe work practices apply to replacing its windows. Ask how the contractor will contain and clean up.
Screens
In dusty conditions, window screens collect grime quickly and can tear. Ask about screen material and how easy the screens are to remove and clean. Some homeowners choose finer mesh that blocks more dust and insects, which slightly reduces airflow.
Fog-season installation
If windows are replaced in winter, ask the contractor to avoid sealing exterior joints onto wet surfaces on foggy mornings, and to follow the sealant maker's limits for temperature and moisture.
Noise
Homes near busy roads, rail lines or agricultural operations may want quieter rooms. Laminated glass and different pane spacing can reduce noise. Ask what options exist for bedrooms facing the noise.
Checking a contractor in California
California's Contractors State License Board lets you look up a contractor's license number, classification and status for free. Check before you sign, and make sure the name on the license matches the name on the contract.