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Twinwall Polycarbonate Panel Storage and Installation Information

Polycarbonate Multiwall Sheets

Storage Requirements

Sheets should be stored in warehouse areas not exposed to direct heat or light which could make the removal of protective film difficult. Supported, sloped stacking is recommended, but sheets may be stacked up to 3' high on a flat even supported surface.


Protective Film

Panels are supplied with a protective PE film which should be kept on until the panel is fastened. The U.V. protected side is to be faced towards the sun and is marked with a white printed film, clear, or light blue film with a Sticker saying co-extruded thermoglazing.



Panels will not crack or split when cut or drilled. They can be cut using a circular saw with a fine tooth blade or with a razor knife cut on both sides of material. Compressed air can be used to remove dust from the channels.

All for proper expansion in all drilled holes. Do not drill within 1-1/2" from the edge of the sheet.

When fastening screws, do not tighten below the surface of the panel.



Stiff fixing by means of adhesive or putty is to be avoided. If using a sealant, please contact us for a recommendation.

Exposed top and bottom ends of a sheet must always be sealed by means of an adhesive aluminum tape to prevent dust and dirt penetrating inside the ribs. A proper polycarbonate "U" profile must then be installed to protect the tape. Extruded ribs shall be installed in a vertical direction for drainage.

Glazing sheets should be joined by extruded polycarbonate profiles and be installed with their protective U.V. stabilized surface towards the exterior. Consult us for approved systems. Extruded polycarbonate profiles are available through us by special order.

Horizontal bars should be avoided. Larger lengths may be available upon request.

For proper application in roofing conditions, a slope of at least 5° is required.

It is advisable to drill small weep holes every 12 inches in the bottom "U" channel profile for condensation drainage. (To avoid damaging the aluminum tape on the sheets, drill holes on polycarbonate "U" profiles before installation.)



Panels should be protected from abrasion by installer. After installation, panels should be washed with a mild soap or detergent and lukewarm water using only a clean sponge or soft cloth, then rinsing with clean water. Fresh paint, grease, and smeared glazing compounds may be removed before drying by rubbing lightly with a good grade of naphtha, isopropyl alcohol followed by a final washing with mild soap or detergent and a final rinse.


Impact Resistance

Able to withstand extreme abuse, its impact strength is 200 times greater than glass and 10 times greater than acrylic. Among the thermostatic product used in the building industry, coextruded thermoglazing has the highest impact resistance. Even when exposed to elevated temperatures over a long period of time it will maintain its structural integrity. On-site, it will not crack or splinter, assuring you a high degree of safety.


Resistance of Polycarbonate to Chemical Agents

Polycarbonate panels are resistant to some chemicals and products and non-resistant to others. Resistance can be affected by the chemicals concentration, duration of exposure, degree of pressure, and temperature at time of contact. Check with us for a chemical compatibility.


Thermal Expansion

Allow for thermal expansion during installation at a rate of 1/8" per 3 feet at 100° temperature differentials in both the width and length of the sheet.


Bending Radii

Panels can be readily cold formed to many bending radii and can be fabricated on site to precise dimensions. It is important to avoid over tensing of the sheet, therefore, the minimum bending radius must be 150 times the thickness of the panel. Minimum bending radius = Ft./1 inch.



For proper point fastening, 1" neoprene bonded washers should be used with screws.

48" wide sheets should be fastened to supports at all four corners, and at points 6" in from the edges of each purlin support.


This information has been drafted to the best of our knowledge. We reserve the right to change specifications and data without notice, if deemed necessary in the evolution of these products. It is the sole responsibility of the customer to confirm with their architect, engineer, or other professional consultant that the materials offered for sale meet the requirements and specifications of the particular project and use for which they are being purchased.

Title: Twinwall Polycarbonate Panel Storage and Installation Information
Description: General Storage, Fabrication, Installation, Cleaning, and Fastening Information.
Published: 3/26/2009
Last Edited: 9/19/2013
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