Vinyl, Fiberglass and Aluminum Frames in Inland Heat

Nothing about a window frame looks like a heat problem until the third summer, and the running record san bernardino new windows petersburg4u holds shows how differently the three common materials behave. New windows in San Bernardino, CA sit in afternoon sun that pushes frame surfaces well past what the weather forecast suggests.

Vinyl

A vinyl window is made of extruded plastic with welded corners. It is the most common frame and the most economical to insulate. Vinyl expands noticeably in heat, so the frame is built with room for movement. White and light colors hold up best, and dark laminates can warp in direct afternoon sun on a west wall.

Fiberglass

A fiberglass window uses a frame of glass fibers set in resin. It expands and contracts at nearly the same rate as the glass inside it, so seals stay tight through temperature swings. Fiberglass takes paint well and does not soften in heat, which makes it a reasonable choice for dark colors in the valley.

Aluminum

An aluminum window is strong and thin, with a slim sightline, but metal conducts heat quickly. A bare aluminum frame in the sun gets hot to the touch and passes heat into the room. A thermal break, a plastic strip between the inside and outside metal, reduces that. Aluminum is also less prone to warping than vinyl.

Wood and clad wood

A wood window has a warm interior and good insulation, but the exterior must be protected from sun. A clad window covers the outside with aluminum or vinyl, leaving real wood inside. In dry Santa Ana weather, interior wood can shrink slightly, so finishes are kept sealed to slow the change.

Corners, seals and color

The weak point in any frame is the corner joint, where the sash meets the frame and the seal runs around a turn. Fusion welded vinyl corners and mitered fiberglass corners are both strong when done well. Color matters too, since a darker frame absorbs more heat and puts more stress on the seal around the insulated glass. For a hot wall in the Inland Empire, a lighter shade is the safer pick. Frames are also checked for how the sash drains, since a corner that traps water after a rare winter storm ages faster than the same corner in a dry year, whatever the material.