Polycarbonate Roofing Sheets for Pergola and Canopy

Polycarbonate for pergolas and canopies: what survives sun, hail and wind

A pergola roof lives outdoors unprotected, so it is specified for three loads a normal roof rarely sees at once — full UV exposure, hail impact, and wind uplift on a lightweight structure. The sheet that handles all three is not the cheapest one, and the failure modes are predictable: yellowing from UV, cracking from hail, and panels lifting off in wind because they were fixed like a solid roof.

UV: the layer that decides the lifespan

A pergola sees more direct sun than almost any other roof, so co-extruded UV protection is not optional here — a coated or unprotected sheet yellows within a season or two of full exposure. Ask for co-extruded UV on the outward face, 50–80 microns, with a warranty that states yellowing index, not just a year count. This single spec separates a canopy that still looks good in year eight from one that is brown and brittle in year two.

Impact: why polycarbonate beats every alternative outdoors

Polycarbonate is roughly 200 times more impact-resistant than glass and far tougher than acrylic, which is what makes it the material for hail country. Multiwall adds a further cushion — the cellular structure absorbs impact energy. For pergolas in hail-prone regions, a 10 mm multiwall or 4–6 mm solid sheet shrugs off impacts that would shatter glass or crack acrylic.

Wind uplift: the fixing that most installers get wrong

A pergola roof is light and open on the sides, so wind gets underneath and lifts. Panels fixed with too few points, or with holes drilled tight, either pull off the fixings or crack around them. The rule is oversized holes for thermal movement, fixings at the manufacturer’s spacing not “a few screws”, and a profile that clamps the panel edge rather than relying on point fixings alone. Tell us the span and local wind zone and we will specify the fixing pattern.

Clear, bronze or opal — the comfort choice

Clear passes the most light but gives no shade; bronze and opal cut glare and heat for seating areas underneath. For a pergola people sit under in summer, a tinted or opal sheet is usually more comfortable than clear, which can turn the space into a greenhouse.

What to send for a pergola or canopy quote

• Roof size, slope and how the frame supports the sheet
• Local climate — hail, wind zone, sun intensity
• Shade preference: clear, bronze or opal
• Solid or multiwall (weight vs impact vs insulation)

Send the structure and climate. We will match sheet type, tint, UV spec and fixing pattern to it — a canopy is only as good as the weakest of those four.