roof drainage – My blog

February 3, 2026

Small-Lot and Terrace Housing: Drainage for Compact Sydney Lots

Small-lot and terrace housing concentrates drainage risk. An engineer's guide to roof drainage, OSD, BASIX tanks and rear-lane lots on compact Sydney…

November 11, 2025

Rainwater Tanks and BASIX: Integrating Roof Drainage in NSW

How to integrate BASIX rainwater tank commitments with roof drainage design on NSW new homes — connected roof area, overflows and certification.

July 12, 2022

Double-Storey Roof Drainage: Council Requirements & Mistakes

Common council requirements and design mistakes on double-storey roof drainage in NSW — upper-to-lower roof discharge, charged downpipes and overflow.

February 8, 2022

Roof Drainage Plans for Single-Storey Houses in NSW: CC & CDC

What NSW builders need in a roof drainage plan for CC or CDC approval on a single-storey home, including gutter and downpipe…

News & Insights

Small-Lot and Terrace Housing: Drainage for Compact Sydney Lots

Rainwater Tanks and BASIX: Integrating Roof Drainage in NSW

Double-Storey Roof Drainage: Council Requirements & Mistakes

Roof Drainage Plans for Single-Storey Houses in NSW: CC & CDC