Keeping water out: the exterior items on a Strathtulloh PCI
Flashing junctions, window seals, weep holes and capping. The outside of a new home is where water gets in, and where the PCI pays off.
In short: Most of a handover list is inside the house. The items that cause leaks a year later are usually outside, along the junctions where different materials meet.
Flashing junctions
Where a roof meets a wall or two flashings meet, the junction has to be shaped and sealed so water runs away. Poorly finished junctions are a major item on some of our Strathtulloh reports.
Window seals and rubber flashings
Loose seals at a sill let wind-driven rain into the wall cavity. Rubber flashings need to sit tight between frame and brick. Both are quick to adjust before handover.
Weep holes against paving
Weep holes should sit at least 50mm above the paving or ground next to them. Once paths are poured too high, the wall cannot drain and the damp course can be bridged.
Capping and gutters
Parapet capping needs a fall of at least five degrees so water runs off. Gutter joints need sealing and spouts need to sit square.
Render and caulking
New render can crack and external gaps need caulking. These are simple items but they decide whether water stays outside.
Written by our local inspection team from work carried out in Strathtulloh. Licensed building practitioners, Building & Plumbing Commission registration CDB-U 53425.
