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Sheet Glazing Guidelines

Wet Glazing
Fig. 53

Dry Glazing
Fig. 54



  • Clean window frame. Remove old putty or broken glass, if necessary.
  • Measure sheet edge engagement area (± 0.75 inch) and internal window frame dimensions, i.e. the space into which the Polycarbonate sheet will be fitted.
  • Calculate sheet size, allowing clearance for thermal expansion (0.118 inch per linear 39 inches).
  • Select right polycarbonate sheet type, which fulfills loading requirements, U-value, etc.
  • Clamp the polycarbonate sheet to a support table to avoid vibration and rough cutting.
  • Cut the sheet to required size, using a standard electric circular or jig saw using a plywood blade (minimum 10 teeth per inch) or blade designed to cut plastics.
  • Blow out the saw dust contaminated channels with clean compressed air.
  • Remove any sharp edges and irregularities from the sheet.
  • Peel back approximately 2 inches of masking film from all 4 edges of the cut sheet on both sides.
  • Select appropriate sealing tape by an accurate consideration of glazing application.
  • Seal the top and the bottom sheet channels with impermeable and/or venting tape  Please refer to the processing instructions provided by the sealing tape supplier.
  • In case of venting tape, and to allow condensed water drainage, apply an aluminum closure profile with drainage possibilities or apply some single sided self adhesive glazing tape as distance holder between the venting holes.
  • For wet glazing apply single sided self adhesive glazing tape or rubber profile to both window frame and bead.
  • For dry glazing, snap-fit neoprene rubber gaskets in place in support profile as well as in clamping cover profile.
  • Insert the  sheet into the window frame.
  • Multiwall PC sheet should always be installed with the ribs running vertically and the UV protected sheet surface should always face outwards.
  • Fix window bead or clamping cover profile in place.
  • For wet glazing apply an appropriate silicone sealing compound, sealants between sheet and window frame/bead.
  • Remove all masking film immediately after installation.
  • Clean window carefully with warm soapy water and soft cellulose sponge or woolen cloth.
  • Do not use plasticized PVC or incompatible rubber sealing tapes or gaskets.
  • Do not use amine, Benzamide or Methoxy based sealants.
  • Do not use abrasive or highly alkaline cleaners.
  • Never scrape PC sheet sheet with squeegees, razor blades or other sharp instruments.
  • Do not walk on PC, acrylic or glass sheet at any time.
  • Do not install  sheet with damaged tape.
  • Do not clean sheet in hot sun or at elevated temperatures.
  • Benzene, gasoline, acetone, carbon tetrachloride or butyl cellosove should never be used on Plastic sheet.
  • Some systems (like the Twinfix® Multilink® Glazing System) do not require a gasket when in use with Multiwall PC Sheet. This system is compatible with every sheet manufacturer worldwide.

©2005 MJK Multiwall Systems, LLC

This page was last modified on April 26, 2010 

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