8mm Clear Polycarbonate Sheet
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Description
8mm clear twin-wall polycarbonate sheet is an insulating glazing panel for greenhouse and high tunnel end walls, doors, and side walls. The hollow twin-wall structure traps a layer of air between two clear walls, so it holds heat better than single-layer glazing while staying bright enough to grow under.
Each sheet is 4' wide and comes in lengths from 8' to 24', so you can size it to most framing with minimal cutting. The clear panel has an anti-fog (no-drip) inner surface that helps condensation run off instead of beading, resists hail and impact far better than glass, and is backed by a 10-year warranty. Custom 6' widths, plus blackout and light-diffusing options, are available on request.
Seal the cut ends like this: aluminum foil seal tape on the top edge, breathable vent tape on the bottom, then fit an edge profile. Fasten the sheet with neoprene washers and self-tapping screws, pre-drilling slightly oversized holes so the panel can expand and contract with temperature.
The 8mm clear polycarbonate sheet is a twin-wall glazing panel for greenhouse and high tunnel end walls, doors, and side walls. Its hollow twin-wall structure traps a layer of air for insulation, so it holds heat better than single-layer glazing while staying clear enough to grow under. At 4' wide in lengths from 8' to 24', you can size it to most framing with minimal cutting.
The clear sheet has an anti-fog (no-drip) inner surface that helps condensation run off instead of beading up, and it resists hail and impact much better than glass. It's backed by a 10-year warranty. Seal the cut ends with aluminum foil seal tape on the top edge and vent tape on the bottom, then fasten it with neoprene washers and self-tapping screws.
Technical Specifications
| Thickness | 8mm |
| Wall structure | Twin-wall (hollow) |
| Width | 4' |
| Available lengths | 8' to 24' (see options below) |
| Material | Clear polycarbonate |
| Warranty | 10 years |
Key Benefits
- Insulating twin-wall: the hollow core traps air between two walls for better heat retention than single-layer glazing, which can mean lower heating costs.
- Anti-fog (no-drip) surface: helps condensation sheet off and run down instead of beading and falling on your plants.
- Impact and hail resistant: withstands weather and impact much better than glass, and it's lightweight to handle and install.
- Backed by a 10-year warranty: a long-service glazing choice for a permanent end wall or greenhouse covering.
Available Lengths
Every sheet is 4' wide. Choose your length:
- 4' x 8'
- 4' x 10'
- 4' x 12'
- 4' x 14'
- 4' x 16'
- 4' x 18'
- 4' x 20'
- 4' x 22'
- 4' x 24'
Custom 6' widths, plus blackout and light-diffusing sheets, are available on request.
Frequently Asked Questions
Q: What is 8mm twin-wall polycarbonate used for?
A: It's a clear, insulating glazing panel for greenhouses and high tunnels, most often on end walls, doors, and side walls. The twin-wall air space holds heat better than single-layer glazing while letting plenty of light through.
Q: How do I seal the cut ends of the sheet?
A: Seal the top edge with solid aluminum foil seal tape and the bottom edge with breathable vent tape, then fit an edge profile or U-channel over both. That keeps the flutes clear while letting any moisture drain out the bottom.
Q: How do I fasten polycarbonate without cracking it?
A: Pre-drill holes slightly oversized so the panel can expand and contract, use self-tapping screws with neoprene washers, and drive each screw just until the washer seats, no further. Keep fasteners back from the panel edge.
Q: What lengths does the 8mm sheet come in?
A: All sheets are 4' wide, in lengths from 8' up to 24' in 2-foot steps. Custom 6' widths, plus blackout and light-diffusing options, are available on request.
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Need a custom size, or help figuring out how many sheets your end walls take? Contact CT Greenhouse for a quote.
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