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How to install polycarbonate sheets
Correct installation extends sheet life, keeps it clear and protects your warranty. These are the key rules for multiwall and solid sheets.
1
Storage before installation
- Store sheets flat on a level surface, indoors or covered, away from sun and rain.
- Do not place heavy items on them or cover them with dark, heat-absorbing sheeting.
- Keep the protective film on until installation.
2
UV side up
- The side with the printed film is the UV-protected side — it must face the sun.
- Remove the film right after installation; film left in the sun bonds to the sheet.
3
Flute direction and slope
- On multiwall sheets the flutes must run with the slope (top to bottom) so water and condensation can drain.
- Keep a roof slope of at least about 5° so water does not stand.
- For curved roofs, do not go below the minimum bending radius — ask us for the value for your thickness.
4
Thermal expansion
- Polycarbonate expands about 3 mm per metre with heat, so leave clearance in profiles and at the edges.
- Pre-drill holes about 3 mm larger than the screw so the sheet can move.
- Do not drill too close to the edge — keep about 4 cm away.
5
Fixing
- Use screws with EPDM washers and tighten without crushing or denting the sheet.
- Aluminium or polycarbonate glazing profiles give a cleaner fix and better sealing.
- Purlin spacing depends on thickness, wind and loads — send us your dimensions and we will advise.
6
Sealing multiwall edges
- Top edge: solid aluminium tape to seal the flutes against dust and insects.
- Bottom edge: breather (vented) tape so condensation can escape, then a U-profile.
- Never leave flutes open without tape.
7
Cutting and silicone
- Cut with a fine-tooth circular saw or grinder, and support the sheet well while cutting.
- Blow the dust out of the flutes after cutting.
- Use neutral-cure silicone compatible with polycarbonate; acetic silicone can damage the sheet.
8
Cleaning and care
- Clean with water, mild soap and a soft cloth.
- Never use thinner, acetone, petrol or abrasive cleaners.
- Do not walk directly on the sheets — use boards to spread the load.
These are general guidelines. Every project is different — send us dimensions and photos and our team will help you choose the right thickness and installation.
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