Do louvered pergolas leak when it rains?

By Eave · 1 Nov 2026

Motorised louvred aluminium pergola with blades closed in the rain over a Malaysian patio, roof silhouette outlined — Louvred pergola closed in the rain, two posts and hidden gutters. Design visualisation.

A well-built motorised louvred pergola does not leak: closed blades interlock and rain drains through a gutter beam and hollow posts. Installed in the Klang Valley: RM 130 – 200 per sq ft (2026).

Why closed louvres stay dry

Each aluminium blade overlaps the next into a flat roof
Blades sit on a slight fall towards the perimeter gutter
Rain sensor closes the roof automatically

Underside of closed interlocking louvre blades draining rain into the pergola gutter channel — Closed blades overlap and drain into the frame gutter. Design visualisation.

Where the water goes

Perimeter beam doubles as a four-sided gutter
Hollow posts work as hidden downpipes
Outlet at the post base runs to your floor drain

Louvred pergola corner post used as a hidden downpipe draining to a floor grate — Hollow post works as the downpipe to a floor drain. Design visualisation.

When a pergola does leak

Cheap kits with thin blades that bow and gap
Gutter clogged with leaves, water backs up over the blades
Poor wall flashing: the wall joint leaks, not the roof

Louvred pergola blades tilted open after rain over a Malaysian garden terrace — Blades open again once the rain stops. Design visualisation.

What Eave builds

Motorised 6063-T5 aluminium blades, 160 km/h wind rating
Four-sided gutter, hidden downpipes, flashed to the wall
RM 130 – 200 per sq ft; a 12 × 16 ft terrace is about RM 25,000 – 38,000

Closed louvred pergola roof in heavy rain, dry patio underneath, water leaving only at the post base spout — Heavy rain on the closed roof, dry patio below, one outlet at the post. Design visualisation.

Dry outdoor dining area under a closed louvred pergola while rain falls on the garden — Dry dining area under a closed louvred pergola. Design visualisation.

Questions people ask

Are louvered pergolas waterproof?

Yes when closed, provided the blades interlock and the gutter and posts are clear.

Does a gutter on a pergola leak?

Only when blocked. Clear leaves twice a year and keep the post outlet open.

Pricing one of these?

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