Fiberglass and Aluminium Frames

The Two Ends of the Frame Question

Fiberglass is the material we recommend when movement is the problem. Aluminium is the material we are usually removing. They belong on one page because the typical Riverside job is exactly that swap, and the removal is the harder half.

Why Fiberglass Holds Still

Fiberglass frames are pultruded from glass fibre and resin, which means the frame and the glass unit it carries expand at close to the same rate. That is the entire argument, and it is a better one than the brochures make it sound.

In a vinyl window the frame grows and shrinks against a glass unit that mostly does not. The sealant joint between them absorbs that movement every single day, and on a hot west elevation it absorbs a lot of it. Over enough cycles that is one of the ways an insulated unit loses its seal and starts fogging. A fiberglass frame barely works the joint at all.

The practical consequences: narrower sightlines for the same structural strength, so more glass in the same rough opening. Frames that stay straight on spans where vinyl needs reinforcement. A surface that takes paint, which matters on the older houses in the Wood Streets where a white frame would look wrong.

It costs roughly double vinyl installed, and it is not the right answer everywhere. On a shaded elevation you are buying stability you were never going to need.

Full Frame Is the Usual Method

Fiberglass generally goes in as full frame replacement rather than retrofit. The old frame comes out to the studs, the new one is set and flashed into the opening, and the stucco is patched back around it. That gets you the full original glass area instead of losing an inch a side, and it lets us see and correct whatever is going on at the sill.

It is more disruption and more money. It is also the only version of this work where the flashing gets done properly, which on a stucco wall is worth something. Water that gets behind stucco has nowhere convenient to go.

Getting the Aluminium Out Cleanly

Most of the single pane windows in Riverside tract housing are aluminium with a nailing fin buried under the stucco. There is no gentle way to release that fin, and this is where full frame jobs go wrong.

The method that works: cut through the fin all the way round with a reciprocating saw run flat against the frame, break the corner joints so the sections come free individually rather than fighting the whole frame at once, then draw each section out. Done in that order the stucco return stays intact and the patch is a narrow band. Done by levering the frame out whole, the stucco comes with it in sheets and the repair becomes the expensive part of the job.

The Case for Keeping Aluminium

Occasionally we advise leaving it. A thermally broken aluminium frame in good condition, straight, with hardware that still runs, is not a bad window. If the glass has fogged, a new insulated unit into that existing frame is a fraction of the cost of replacement.

What we will not tell you is that new glass fixes an old bare aluminium frame. It does not. Metal with no thermal break conducts outdoor temperature through itself into the room, which is why those frames feel cold to the touch on a January morning and hot in the afternoon. That is the frame. No glass package changes it.

Call (951) 592-7124.