How many double tiles per square metre?

Around 5.9 per square metre at 280mm gauge – half the count of the single, because each one covers the same area as two. Add 5 to 10 per cent for wastage.

Can I mix doubles with single and half tiles?

Yes, and that is how they are normally laid. Doubles across the open field, singles and halves round the perimeter where you need the narrower pieces to close courses at verges and valleys.

The Envirotile slate double tile is 365mm x 630mm — one unit covering what two singles cover, with the same riven slate face and the same dry-fix interlock. Across a big plain area it is the quicker way to get a roof on: half the pieces to handle, half the fixings, fewer laps to line up.

Around 5.9 tiles per square metre at 280mm gauge. Use the doubles across the field and keep singles and halves for the perimeter, where you need the narrower pieces to close courses at verges and valleys. Same 12.5° minimum pitch and the same weight per square metre as the singles — roughly 8.5kg laid, which is about a fifth of concrete.

Ordering and delivery. Envirotile comes out of your nearest Eurocell branch. Orders over £150 are delivered free to site; under £150 delivery is £10. Order the whole roof in one go and add 5–10% for cuts and wastage – it is the top-up order for a dozen tiles that costs you time.

Key Features

✔ 365mm x 630mm, riven slate texture
✔ Covers the same as two single slate tiles
✔ Around 5.9 tiles per m² at 280mm gauge
✔ Around 8.5kg per m² laid
✔ Minimum pitch 12.5°
✔ Brown, Slate Grey, Terracotta or Anthracite Black
✔ Use with the slate-profile ridge, hip and gable caps
✔ 25-year guarantee