Multiwall polycarbonate is the most popular roofing material for pergolas, lean-tos, patios and side entrances in Ireland. It is lightweight, UV-stabilised, lets in natural light and holds up well to Irish weather. This guide covers everything you need to know to choose the right sheets, accessories and thickness for your project — whether you are roofing a lean-to, a freestanding pergola, or an apex structure.

Marlon ST Longlife is a high performance multiwall glazing material manufactured from damage resistant polycarbonate with co-extruded Longlife UV protection. It is light in weight yet robust and resistant to impact.

Cutting multiwall polycarbonate sheets is a straightforward process with the right tools and techniques. Here's a quick guide to help you get started:

This guide covers everything you need to install multiwall polycarbonate roofing sheets correctly — from rafter spacing and sheet orientation to sealing, flashing, and thermal expansion. Whether you're roofing a pergola, lean-to, carport, or greenhouse, follow these steps for a weathertight result that lasts 15–20 years.