Multiwall Polycarbonate Sheets - FAQs

Take a look at some of the most frequently asked questions for Multiwall Polycarbonate Sheets around choice, installation & maintenance.

What type of Polycarbonate Sheets should I use in a greenhouse?

Most greenhouses use 4mm thick glazing – please call us to place an order.

What should I use for a lean-to roof?

We recommend to use 10mm or 16mm thick Polycarbonate Sheets for this application.

What should I use for a conservatory roof or living room?

We recommend to use 25mm or 35mm Polycarbonate Sheets for conservatory roof glazing. By using thicker polycarbonate glazing, this allows to gain optimum U values and insulation levels.

What is the best glazing material to stop heat build-up?

We recommend using our Solarguard sheet. This is an innovative polycarbonate with a grey metallic surface on Opal. It is designed to limit heat build-up within the conservatory/room and by deflecting solar radiation it can reduce solar heat gain through the roof by up to 50% compared to conventional material.

How do I cut Polycarbonate Sheets?

Polycarbonate sheets can be cut with a circular saw (using a very fine blade) or a jig saw. If possible, it is better to cut a few sheets at a time to reduce vibration. Sheets can also be cut by hand using tin snips or a utility knife.

How do I clean Polycarbonate Sheets?

We recommend using warm water with a mild household detergent. This should be sufficient to clean the sheets. Wipe off any remaining dirt with a soft cloth and wash again. NEVER use a solvent based cleaner. AVOID using sponges or brushes that can scratch the surface of the sheet.

Which side up should the Polycarbonate Sheets be installed?

Polycarbonate Sheets should always be installed with the branded film facing up (outside).

Does condensation affect Polycarbonate Sheet installations?

In our experience condensation, correctly understood as arising from the precipitation of moisture from saturated air, is often used erroneously to describe the effects and results of water ingressing into the sheet from outside due to deficiencies in installation. While the former is characterised by misting of the surface, the latter is characterised by the formation of larger discrete droplets within structured sheet. Polycarbonate, being hydroscopic, absorbs moisture from the atmosphere and installations depend on ventilation to avoid saturated air in the cellular structure, which will condense under appropriate conditions.

We find that during the first few months after installation there can be a tendency for some condensation to appear, but after a ‘settling down’ period it will disappear again. However given the hydroscopic nature of the material and unfavourable conditions, e.g. high moisture-laden atmosphere, large temperature differentials between inner and outer surfaces of the sheet, low roof pitch, poor ventilation, there are some installations where condensation may be a more or less constant phenomenon (e.g. low pitch North facing roof).

What are Solar Inserts?

Solar inserts with their integral solar protection prevent up to 80% of the sun’s solar energy from entering the conservatory through the roof, helping maintain a comfortable internal temperature. The roof will also reduce glare by 80%, further increasing comfort levels. In winter, most of the heat lost escapes through the roof; with a solar inserts roof a large proportion of rising heat is radiated back into the room, helping to maintain a comfortable temperature.