See the glazing trade-offs side by side, with evidence.
Best all-rounder
Twin-wall polycarbonate
- ~80% diffused Document
- Good — traps air Document
- Shatter-resistant Document
- $$ Listing
- 10–15 yrs Listing
Best for cold climates, kids & pets, tender seedlings.
Best light & longevity
Horticultural glass
- ~90% direct Document
- Poor — single pane Document
- Can shatter Document
- $$$ Listing
- 20+ yrs Listing
Best for maximum light, permanent showpiece builds.
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Roofline Selector