Does Polycarbonate Roofing Block Heat

November 30, 2025

2 min read

Polycarbonate roofing does block some heat, but not as well as other materials. Polycarbonate sheets let light pass through while keeping some warmth out. However, they work best when paired with the right installation and color choices. Many homeowners choose polycarbonate for patios and greenhouses because it offers a balance of light and temperature control. The amount of heat blocked depends on the thickness and color of the sheets you pick.

How Much Heat Does Polycarbonate Block?

Polycarbonate is semi-transparent, which means it lets some sunlight through. This is different from solid roof materials like asphalt shingles or metal. The material can reduce heat gain, but it is not as strong as reflective cool roofs.

According to industry data, cool roofs can lower indoor temperatures by nearly 6 degrees Fahrenheit in non-air-conditioned buildings. Polycarbonate sheets with UV coatings perform better at blocking heat than plain sheets. Twin-wall or multi-wall polycarbonate designs trap air and provide better insulation than single-wall options.

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Polycarbonate Vs. Other Roofing Materials

Different roof materials perform differently when it comes to blocking heat. Let’s compare a few common types:

Material Type	Heat-Blocking Ability	Lifespan
Polycarbonate	Moderate (with UV coating)	10-20 years
Metal Roofing	High (especially reflective)	40-80 years
Asphalt Shingles	Low	20-30 years
Cool Roofs (reflective coating)	Very High	Varies

According to RubyHome, asphalt shingles cost between $4.25 and $4.95 per square foot, while metal roofing ranges from $5.50 to $17.05 per square foot. Metal roofs last much longer and block heat more effectively than polycarbonate.

Best Uses for Polycarbonate Roofing

Polycarbonate works best for specific projects. Patios, pergolas, greenhouses, and carports are ideal spots. These structures benefit from the light that passes through while still getting some heat protection.

Polycarbonate is not recommended for primary home roofing. According to industry data, approximately 80% of roofing materials used in the U.S. are asphalt shingles, which last 20-30 years. Polycarbonate only lasts 10-20 years before needing replacement. For main roofs, metal or asphalt options are more durable and cost-effective over time.

Tips for Better Heat Blocking With Polycarbonate

Here are simple ways to make polycarbonate work better for heat control:

Choose multi-wall polycarbonate instead of single-wall for better insulation
Pick a darker color or tinted polycarbonate to reduce light and heat
Add a UV-blocking coating to your sheets
Install shade cloth or screens on the sunny side
Use proper ventilation underneath to allow air to flow

According to the Insurance Information Institute, in 2024 hail damage cost U.S. homeowners $160 billion in reconstruction value. Polycarbonate can crack under hail, so it is not suitable in areas prone to severe weather. For homes in storm-prone regions, metal roofing or concrete tiles offer much better protection.

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Contact a qualified roofing services for expert guidance on roof repair, replacement, or installation.