What is a Polycarbonate Multiwall Sheet?
It is a hollow polycarbonate panel: two or more parallel skins extruded as one piece with internal ribs holding them apart. The ribs divide the space between the skins into channels that run along the length of the sheet. That hollow section, and the still air inside it, is what distinguishes the product from a solid sheet of the same material.
How does it differ from solid polycarbonate?
Solid compact sheet is one continuous thickness of material with flat faces and no voids. Multiwall is hollow. The practical consequences are that multiwall carries less material for a given depth, gives a glowing rather than a clear view, and needs channel detailing at every edge that a solid sheet does not. They are not interchangeable in a specification.
Which wall structures are available?
The number of walls, the rib spacing and the internal geometry are properties of the grade supplied, and they are confirmed for your order rather than published here. The cross-section drawing on this page is labelled illustrative for exactly that reason. Tell us the application and we will confirm which structure can be supplied against it.
Which thicknesses are available?
The published range is 10–20 mm. Discrete options inside that range are not confirmed for this product, so none are listed here and none should be assumed. Tell us the thickness your span and support spacing call for — or send us the structure and let us recommend one — and we will confirm what can be supplied.
Which colours and dimensions can be supplied?
The published colours are Bronze, Clear, Dark Blue, Green, Lake Blue, Metallic Grey and Milky. Widths are 1220 mm and 2100 mm. Length is made to your requirement rather than being unlimited: the practical maximum depends on the thickness, the width, how the load packs and how it can reach your site, so ask us to confirm it for your order.
Does it provide UV protection?
The UV-resistant layer is co-extruded into the skin as the sheet is formed rather than applied as a coating afterwards, so there is no surface film to abrade or wash off. Which face carries it, and whether one or both faces are protected on the grade you are quoted, is confirmed with your order. The protected face must be installed outward.
What affects its thermal performance?
The construction, the overall thickness and the completed installation. Still air in the channels is the reason this construction behaves better than a single skin of the same material, but the framing, joints, sealing, upstands and any thermal bridges around the panel all act on the finished result. For that reason no U-value is published here — a figure without its inputs cannot be used in a design. Ask for the datasheet for the grade and thickness quoted.
Can it be used for greenhouse glazing?
It is commonly considered for protected cropping, and the air space is usually the reason multiwall rather than a single skin is specified. Whether it suits your crop, climate and growing method is a horticultural decision this page cannot make: light requirements differ by crop and season, so confirm the light levels your crop needs against the datasheet for the grade and colour before committing.
What should be checked for roofing applications?
Thickness against span and the loads the roof will see, support spacing, fixing centres with room for thermal movement, slope and drainage, compatibility with any adjacent roof sheeting and its laps, and the flashing and sealing detail at every joint and upstand. All of it is project engineering for the actual structure, and no span, load or slope figure is claimed on this page.
How are channels, edges and thermal movement handled?
Channels run along the length of the sheet and are oriented so moisture forming inside them can reach an open low edge. Ends are closed with the appropriate closure and a breather closure at the low edge, using tape specified for the purpose, so the channel keeps dust out while still breathing. Fixing holes are oversized so the sheet moves against the fixing rather than being pinned. The actual allowances come from the approved instructions for the grade and length supplied.
What affects pricing and delivery?
Thickness, colour, width, the length of your run, total quantity against the production minimum, the accessories specified with it, and freight to your location. There is no published rate card because those variables change the figure. Production lead time, dispatch and transit are three separate things; ask us to confirm each for your order.
What information is needed for a quotation?
Application and delivery location; the thickness you need or the span and support spacing so we can recommend one; colour; required sheet dimensions; quantity and the unit you are working in; and anything about the supporting structure or the project programme that affects the specification. The enquiry form on this page collects exactly that, and anything you select in the colour explorer is carried into it.