The window shops have tons of free windows, sitting out back, waiting for the landfill.

You can rebuild these to be part of your natural building projects if you know how.

First I prime the frame and then I use a non-hardening glazing compound to hold the glass in and seal against the weather. The old school method is with linseed oil and whiting.

After 2 weeks of waiting for a skin to develop on the glazing compound, paint with micro-porous alkyd enamel or breathable natural paint.

I make use of patio door glass. It's tempered. Quite often, they are disposed of because the seal has gone and there is mist or mildew inside,  between the panes.

I carefully cut the rubber seal and separate the panes,  so that I get two panes of tempered glass for every thermal unit.

Dale Hodgins wrote:I make use of patio door glass. It's tempered. Quite often, they are disposed of because the seal has gone and there is mist or mildew inside,  between the panes.

I carefully cut the rubber seal and separate the panes,  so that I get two panes of tempered glass for every thermal unit.

Yeah, they make great greenhouse panels.