Windhoek suburb

Roofing in Rocky Crest

Rocky Crest sits high and open, and the wind is a design input rather than a nuisance. Edges, verges and parapet cappings take loads that a sheltered stand in the valley never sees.

The building stock is recent, so the failures are rarely age-related. They are detail and exposure failures: a capping that lifts, a membrane edge that peels, a barge flashing fixed too sparsely.

Roof stock here

Recent development on exposed high ground: flat concrete roofs with parapets, some pitched sheet roofs, townhouse clusters.

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What's happening with your roof?

What actually goes wrong in Rocky Crest

Wind uplift at edges

Uplift is highest at corners and along verges. Fixing density there needs to be greater than in the field of the roof, and the edge trim has to be mechanically secured rather than relying on adhesive.

Parapet cappings

Loose or poorly lapped cappings let wind get underneath, then rain follows into the wall head and appears internally as a damp band below the ceiling.

Membrane edge peel

A membrane that lifts at one corner will unzip across a season of windy afternoons. Catching it early is a small job; catching it after the rains is not.

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