Roof Tiles Count by Area

Estimating tile quantity by roof area and type

The tile count comes out of N = A_roof × tiles_per_m² × (1 + waste). That waste figure is there to cover the cuts you make at hips, valleys and ridges. Typical Brazilian rates run like this: ceramic colonial around 25/m², Roman 14/m², Portuguese 16/m², French 16/m², plan 14/m². A corrugated fiber-cement sheet of 5 mm, sized 1.10 × 2.13 m, ends up covering roughly 2.3 m² once you account for the 14 cm side overlap and the 25 cm front overlap.

On a simple gable roof, plan for 5–10% waste; bump that to 12–15% once you're dealing with hipped or multi-plane designs that have valleys. It's worth grabbing one extra pack for repairs down the line, since the color tone drifts between production batches. On the Brazilian market the big names are Tigre for PVC accessories, Eternit for fiber-cement, and Cerâmica Stein/Forte for ceramic.

Applications

Material take-off, freight planning (a pallet of ceramic tiles runs 1.0–1.5 t), comparing the budget across tile types, checking the structural load on the rafters (ceramic around 45 kg/m² against fiber-cement at roughly 18 kg/m²), and putting a time estimate on the installation.

FAQ

Should I use projected or sloped area? Use the sloped area. If all you have is the projection, run it through the pitch tool first and work from that.

What waste should I assume? Go with 8% on a clean gable roof, 12% once you've got hips with valleys, and 15% for the complex shapes with dormers.

Are ridge/hip tiles included? They aren't. Measure the linear meters of ridge and hip on their own and order dedicated ridge tiles (cumeeira), figuring about 3/m for ceramic.