32mm Multiwall Polycarbonate

35mm has become the standard for new conservatory roofs because it insulates a little better, so most new specifications now call for it. We still stock 32mm because it is the size fitted in many existing conservatory roofs, and glazing bars and end closures are still made for it. It is not discontinued. If you are replacing panels, match the thickness already fitted.

Largely, yes. Many conservatories built with polycarbonate roofs use 32mm sheets, and the glazing bars, end closures and tapes on those roofs are sized for it. Replacing like for like keeps everything fitting properly. For a new roof most people choose 35mm, though 32mm still works well and the difference in insulation between the two is small.

We recommend a maximum sheet width of 1000mm for 32mm multiwall without extra support. The manufacturer allows wider spans at light loads, but 1000mm is the safe figure for a DIY roof. Sheet width is not a guarantee of a sound roof, so check your wind and snow exposure, or call the technical team before you order.

Yes. We stock 32mm in the same five finishes as 35mm: clear, bronze, white opal, bronze/opal dual colour and opal heat guard. That means you can replace a single tinted panel in an existing 32mm roof without changing the look of the rest. Check which finish is fitted before ordering, because bronze and bronze/opal both look bronze from outside.

The printed protective film marks the UV-protected face, and that face goes towards the sun. Leave the film on until the sheet is in position, then peel it off. Run the flutes, the hollow channels inside, down the slope so condensation drains to the bottom edge. Fitted the wrong way up, the sheet will yellow and crack within a couple of years.