Roofer

Roof Sheets

Sheets to cover a roof area.

Roof area(m2)

Effective cover width(mm)

Sheet length(m)

Wastage(%)

Sheets

Cover per sheet3.8 m2

Formula

sheets = ceil(area x (1 + wastage) / (cover width x length))

ceil(130 x 1.1 / 3.8) = 38

Effective cover width (after the side lap), not the full sheet width.