Storm season · 6 min read
Storm damage to a Windhoek roof: what to do in the first 24 hours
Updated
Windhoek storms are short and violent. Ninety minutes of hard rain and gusting wind can undo a detail that has held for fifteen years, and the damage is usually discovered at night with water already crossing a ceiling.
The first day matters. Not because a roof can be properly repaired in the rain — it cannot — but because what you do in those hours decides how much of the damage stays confined to the roof.
Deal with the inside before the roof
Water inside the house does more damage per hour than an open roof does. Move what can be moved, get containers under the drips, and if a ceiling board is bulging with trapped water, put a bucket underneath and pierce the low point deliberately rather than letting it collapse over an entire room.
Switch off the circuit feeding any light fitting or socket in the wet area. Water tracking along a ceiling reaches downlights before it reaches your bucket.
Stay off the roof while it is wet
A wet sheet roof at pitch is genuinely dangerous, and a storm-damaged one may have fixings that no longer hold weight. Nothing you can do up there during the rain will improve the outcome.
If water is pouring in and something has to be done immediately, work from inside the roof space where you can see daylight through the covering, and place a sheet of plastic to divert the flow into a container rather than trying to seal anything.
A storm rarely creates a new weakness. It finds the one that was already there and finishes the job in ninety minutes.
Photograph everything, from the ground
Photographs taken now are worth more than a description later. Shoot the ceiling stains, the wet floor, the outside of the house from each corner, and anything visibly out of place on the roof line: a lifted ridge cap, a flapping barge flashing, tiles displaced along one row.
Include a wide shot of each elevation. It gives context and it often catches damage you did not notice while looking for the obvious hole.
Understand what probably failed
Storm leaks in Windhoek fall into a small number of categories. Wind lifts a ridge cap or barge flashing whose fixings had already loosened. Rain is driven uphill under an end lap on a low-pitch sheet roof. A gutter or box gutter that filled with dry-season dust backs up and pushes water over the fascia and into the roof space. Or a flat roof outlet blocks and the water finds the weakest point in the upstand.
Knowing which of these it is changes the repair completely, which is why a leak that appears in one storm and not another is useful information rather than a mystery.
- Water only in a driving-rain storm: usually laps, flashings or underlay
- Water in every rain: usually a hole, a failed penetration or a blocked outlet
- Water down a wall inside: often a gutter or box gutter overflowing backwards
- Water after the rain stops: saturated insulation or ceiling still releasing
Once it is dry
Open the roof space and look for daylight and for wet timber. Lift a ceiling access panel if there is one. Wet insulation should come out rather than be left to dry in place, because it will keep marking the ceiling and holding damp against the boards for weeks.
Then get the roof looked at properly before the next front arrives. In February the next front is rarely more than a week away, and a detail that has already opened will open further.