Corotherm Installation Guide (PDF, opens a new tab)
PDF · discovered on the published product page. File version and current applicability require confirmation.
Multiwall polycarbonate / Product information
10mm Twinwall Corotherm is a light weight, impact resistant polycarbonate roofing and glazing sheet available in clear and bronze. Available in full sheets and cut to size.

Published product information
Available in clear and bronze
Light weight glazing sheet
UV resistant for durability
Durable and hardwearing
Minimum condensation risk
Largely self-cleaning
Greenhouses
Sunscreens
Swimming Pool Covers
Vertical Panels
Plant Houses
DIY Glazing Projects
Refer to the Corotherm installation guide and installation video for complete installation instructions.
Energy Efficiency - Relative U-Values*
| Sheet Thickness(mm) | Corotherm | Single Glass | Double Glass | Argon Filled Cavity |
|---|---|---|---|---|
| 6mm (Twinwall) | 3.7 | 5.7 | 2.65 | 1.6 |
| 10mm (Twinwall) | 3.2 | 5.6 | 2.65 | 1.6 |
| 16mm (Triplewall) | 2.4 | 5.4 | 2.65 | 1.6 |
| 25mm (7Xwall) | 1.6 | - | 2.65 | 1.6 |
*A lower U-value indicates increased energy
General
Make sure the clearly marked UV protected side of the sheet is facing outwards
Allow a minimum of 10° roof slope for water drainage
Use only low modulus neutral cure sealant and cross-linked butyl flashing tape
The flutes of the sheets must run from top to bottom of the slope, never from side to side
Sheets cannot be joined top to bottom
Cutting Corotherm can be easily cut and will not crack or shatter. When cutting parallel to the flutes a sharp knife can be used but when cutting across the flutes a fine toothed saw is required. For cutting curves use a fine toothed jig saw.
Thermal Expansion When installing Corotherm sheet it is important to allow a sufficient expansion gap at the top end of the sheet. When drilling fixing holes an expansion allowance of 3mm around all fixings is required. Do not fix or clamp sheets too tighly - leave room for thermal movement.
Cleaning Corotherm can be easily and quickly washed with luke warm soapy water and a soft cloth or sponge. Do not use brushes or sharp objects and avoid any abrasives or cleaners of high alkaline nature.
Supporting resources
PDF · discovered on the published product page. File version and current applicability require confirmation.
Linked in the published catalogue

Multiwall polycarbonate
Two piece rafter glazing bar (aluminium base with PVCu cap) suitable for use with 10mm and 16mm polycarbonate sheet. Available in white or brown in 3m, 4m and 6m lengths.
View product
Multiwall polycarbonate
Plastic 'F' profile for use at the side edges of a corotherm roof. Available to suit 10mm, 16mm and 25mm corotherm multiwall polycarbonate sheets in both white and brown colour …
View product
Multiwall polycarbonate
Sheet end caps clip along the outside edge of a Corotherm roof to provide a professional look. Options available to suit 6mm, 10mm, 16mm and 25mm polycarbonate glazing sheet. Th…
View product
Multiwall polycarbonate
Fixing screws complete with watertight covering 'button', seal and plastic washer. Suitable for fixing through the sheet into the timber support to provide a secure fit. Supplie…
View product
Multiwall polycarbonate
Breather tape with a fabric membrane to allow free movement of air within the Corotherm multiwall sheet structure. Prevents damage due to thermal expansion whilst minimising con…
View product
Multiwall polycarbonate
Aluminium tape to seal the top edge of Corotherm sheet, preventing the ingress of dirt, insects and algae. Supplied in 10m rolls.
View product
Multiwall polycarbonate
A sticky butyl strip suitable for flashing up against many types of surface, providing a watertight seal without the need to dress into the wall. Supplied in 10m rolls.
View product
Multiwall polycarbonate
White, neutral cure, low modulus silicone sealant fully compatible with Corotherm multiwall polycarbonate glazing sheet.
View productRange & components
Corotherm multiwall polycarbonate is the light weight, impact resistant, insulating glazing sheet from Ariel Plastics. Suitable for a wide range of roofing and glazing applicati…
Explore rangeRange & components
The professionally engineered Self Supporting Roofing System available from Ariel Plastics free-spans 4.0m and accommodates 16mm, 25mm and 35mm multiwall polycarbonate roofing s…
Explore rangeRange & components
Ariel Plastics offer a full range of multiwall polycarbonate installation accessories for your timber supported roofing system. The timber supported roofing accessories include …
Explore rangeProduct & project support
Keep this product context with your enquiry and let Ariel confirm the next step.
Content imported from Ariel’s published product information, captured 27 October 2026. Final technical/content approval is pending; current stock, delivery and warranty assurances are not asserted. Source reference (opens a new tab) ↗