Roof Insulation

Insulation for metal roofs: blankets under the sheet

A metal roof heats up fast in summer and drums in the rain. A roof blanket laid over the battens or purlins, under the sheet, cuts heat flow and softens the noise. That is the job these products do, whether you call it a metal roof, a Colorbond roof or a tin roof.

The Anticon 60 roofing blanket by Bradford is a glasswool blanket made for use under metal roofs, with a listed R-value of 1.6. The Lion Insulation roof blanket is glasswool with a heavy duty reflective foil facing, for metal and tiled roofs, fitted between the roof cladding and the purlins or battens. The foil facing also acts as a vapour barrier.

Both come as 15 m x 1200 mm rolls covering 18 square metres. Work out the roof area, divide by 18 and allow extra for laps and offcuts.

Thermoseal ResiWrap is a wall wrap, 1350 mm wide, for the walls rather than the roof.

Lay the blanket, then the sheets. Colorbond roof sheets are in metal roofing, the fixings are in roofing screws, and our guide to installing a metal roof in the right order shows where the blanket goes.

Metal roof insulation FAQs

What insulation goes under a tin roof?

A roof blanket, laid over the battens or purlins before the sheets go on. Anticon 60 and the Lion roof blanket are both made for this.

How many rolls do I need?

Each roll covers 18 square metres. Divide your roof area by 18, then add extra for laps and cuts.

Do you sell sisalation?

Not at the moment. If you want a foil-faced product, the Lion roof blanket has a reflective foil facing over the glasswool.

Can roof insulation be delivered interstate?

No. The rolls are delivered within our Victorian service area, or you can collect them from Truganina.