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| Frame and sash construction | ||||||||||||||||
| Frames and sashes can be made of the following materials: | ||||||||||||||||
| Material | thermal resistance | Durability | Maintenance | Cost | Recycled content | Comment | ||||||||||
| Wood | very good | variable | high | high | low | shrinks and swells with humidity changes | ||||||||||
| vinyl or PVC | very good | good* | low | low | very low | |||||||||||
| Aluminum | bad** | good | very low | low | typically > 95% | used in most large structures | ||||||||||
| Steel | medium | superior | very low | high | > 98% | typically welded at corner joints | ||||||||||
| Fiberglass | very good | very good* | very low | high | medium | |||||||||||
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