Strathtulloh Building
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Mortar in the cavity and weep holes under paving: brick drainage in Strathtulloh

A cavity packed with mortar at fixing stage and weep holes less than 50mm above paving at handover. How brick walls lose their drainage on new Strathtulloh homes.

  • Strathtulloh 3338
  • 23 September 2026
  • 3 min read
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In short: A brick veneer wall is designed to get wet and drain. On Strathtulloh builds we find both halves of that system blocked, at fixing and again at handover.

How a brick wall drains

Rain soaks into brickwork. The cavity behind it lets that water run down to the base, where weep holes let it out above the damp course. Block either and the water stays in the wall, next to the frame.

A cavity full of mortar

At a fixing inspection in July 2026 we found the cavity packed with mortar droppings, a major item because it bridges moisture across to the frame and blocks ventilation. It has to be cleared before the walls are finished.

Weeps blocked by render

On a fixing inspection that same month, weep holes were blocked with mortar and render. Each blocked weep is a wall section that cannot drain.

Paving poured too high

At an August 2026 handover the weep holes sat less than 50mm above the porch surface. Once paving rises to the weeps, water can enter rather than leave. The fix is to lower or set back the paving before handover.

Written by our local inspection team from work carried out in Strathtulloh. Licensed building practitioners, Building & Plumbing Commission registration CDB-U 53425.

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FAQ

Questions Strathtulloh owners ask about this

Why does mortar in the cavity matter?

It bridges moisture from the brick to the frame and stops the wall ventilating.

How high should weep holes be?

At least 50mm above the adjacent paving or ground.

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