Fasteners for Twinwall & Multiwall Polycarbonate Panels
When installing multiwall polycarbonate panels, selecting the appropriate glazing systems and fasteners is crucial for achieving a secure and effective installation. Here are the things you should know before buying fasteners for twinwall and multiwall polycarbonate panels.
Products
Recommended Fasteners
- For soft woods, such as fir, pine, cedar, or spruce, we recommend using a minimum of #10 coarse screws.
- For metal structures (like aluminum or steel), opt for #10 self-drilling screws.
- Important Note: To ensure a secure fit, fasteners must penetrate the roof or wall of your structure by at least one inch.
Polycarbonate Panel Washers
To further enhance the integrity of your panel installation, it is essential to use washers. Use at least a 1/2″ non-conductive EPDM bonded washer.
Larger washers can be utilized if desired, but ensure the minimum outside diameter of the washer is 1/2″.
Special Considerations for Windy Areas
In regions prone to heavy winds, we recommend using either:
- 1″ Diameter Neoprene Bonded Steel Washers
- 1″ Diameter Neoprene Bonded Bubble Steel Washers
| Polycarbonate Multiwall Fasteners | |||
| Item Description | Cost | Order Online | |
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1" Diameter Neoprene-Bonded Steel Washer
100 Pieces per Package Note: Add to the listed screws for extra holding in high wind areas. |
$19.99 | ADD TO CART |
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Hex Head #10 x 1″ Screw with 1/2″ OD Galvanized Steel Neo-Bonded Seal Washers
(For 6 mm Thickness or Less) 100 Pieces per Package |
$14.99 | ADD TO CART |
| Hex Head #10 x 1-1/2" Screw with 1/2" OD Galvanized Steel and EPDM Control Seal Washers
For 8 to 10mm Thickness or Less 100 Pieces per Package |
$20.79 | ADD TO CART | |
| Hex Head #10 x 2" Screw with 1/2" OD Galvanized Steel and EPDM Control Seal Washers
For 16mm Thickness or Less 100 Pieces per Package |
$26.49 | ADD TO CART | |
| Hex Head #10 x 2-1/2" Screw with 1/2" OD Galvanized Steel and EPDM Control Seal Washers
For 25mm Thickness or Less 100 Pieces per Package |
$32.29 | ADD TO CART | |
| Hex Head #10 x 3" Screw with 1/2" OD Galvanized Steel and EPDM Control Seal Washers
For 16 mm Thickness or Less 100 Pieces per Package |
$37.99 | ADD TO CART | |
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1" Diameter Neoprene Bonded Steel Bubble Washer
Use #12 Fasteners without washers (below) when using bubble washers. 100 Pieces per Package |
$59.00 | ADD TO CART |
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Hex Head #12 x 2-1/2" Screw without Washer
For Less Than 16mm Thickness 100 Pieces per Package |
$29.99 | ADD TO CART |
| Hex Head #12 x 3 Screw without Washer
For 16mm Thickness or Greater 100 Pieces per Package |
$35.99 | ADD TO CART | |
Çall us for the specific fastener you need by color or steel type.

25 per Package
$24.99 per Package
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