Roof Suite

RAINWATER AREA, GUTTERS, AND DOWNPIPES.

Use this page to estimate roof drainage capacity before detailing begins. It calculates catchment area, runoff, gutter loading, and the number of downpipes required.

Catchment Runoff Gutters Downpipes

Roof Inputs

Enter roof faces, slope, and rainfall assumptions. The tool totals the catchment and estimates gutter and downpipe demand.

Rainfall (mm/hr)

Gutter capacity (L/s)

Downpipe capacity (L/s)

Overflow factor

Roof Face Area (m2) Slope (deg) Remove

Diagram

Roof Diagram

The diagram shows the roof faces and drainage response so you can see how the catchment is distributed across the plan.

Summary

Drainage Totals

0 m2 catchment 0 L/s runoff

0 gutters required 0 downpipes required

Overflow factor 0 Add roof faces to start checking