Patio Repairs in Perth

Water travels. A drip appearing halfway along the house wall often enters two metres away at a lifted flashing and runs along a purlin before it falls.

So diagnosis starts at the high side and works down. The flashing into the existing roof, the sheet laps, the fixings, and the junction where the patio meets a wall or a downpipe.

Flashing is the most common culprit by a wide margin. On tiled roofs it is usually a flashing laid over the tiles instead of under them, and on metal roofs it is a lap running the wrong way.

Fixings come second. Screws driven at an angle, or with perished washers, let water in one drop at a time for years before anyone notices the stain.

If water sits on your patio roof after rain, the fall is wrong or the roof has deflected. Both are worth fixing rather than living with.

Ponding does real damage. Standing water works into the laps, holds dirt against the coating, and leaves the tea-coloured staining that makes an otherwise sound roof look neglected.

The cause is usually one of three things. Insufficient fall from the outset, a sagging purlin or beam, or a gutter set too high at the low edge so water backs up onto the sheets.

Fixing it can mean packing purlins, adjusting the gutter line, or in the worst cases re-supporting the roof. A cosmetic clean without addressing the fall just resets the clock.

Post bases fail more often than any other structural element on a Perth patio. Water sits at the joint between steel and concrete, and rust works from the outside in.

The paint hides it. A post can look perfectly sound and have lost most of its wall thickness at the very bottom, which is exactly where the load is highest.

Testing is straightforward. A firm tap with a hammer at the base tells you a great deal, and where there is doubt the paint gets scraped back and the section measured.

The repair depends on how much is gone. Surface corrosion is treated and recoated; significant section loss means replacing the post or splicing to an engineered detail with a new base plate.

A gutter that overflows in every decent downpour is either blocked, undersized, sagging, or discharging into a soakwell that no longer works.

Blockage is easy to rule out and easy to fix. Perth's peppermint and jacaranda leaf drop fills a patio gutter faster than most people clean it.

Sagging is next. Brackets at too-wide centres let the gutter belly between them, water pools, and the extra weight makes it worse over time.

Undersized is the harder one. Where a wide roof drains to a single downpipe, the honest fix is a second downpipe or a deeper gutter profile, not another clean-out.

Perth gets serious wind events, and flat patio roofs take uplift rather than the sideways load people imagine. Sheets lift at the edges and corners first, where the pressures are highest.

After a storm, the checks are the same every time. Loose or missing fixings, lifted sheet edges, damaged flashings, bent purlins and any movement at the post bases.

Older patios with sparse fixing patterns are the ones that suffer. A roof fixed to a 1990s pattern is not fixed to what current wind provisions call for.

Repairs are an opportunity to bring the fixing pattern up to standard while the sheets are being refixed, which costs very little extra at that moment.

Polycarbonate is the most repair-prone roofing on Perth patios. Ultraviolet exposure yellows it, makes it brittle, and cracks it around the fixings.

Once a sheet has gone brittle it cannot really be repaired. Patching a crack in old polycarbonate lasts a season at best, because the whole sheet is at the same point in its life.

Hail, falling branches and even a stone from a mower will punch through degraded sheet that would have shrugged it off when new.

Replacement of individual sheets is possible where the rest is still sound. Where the whole roof is at end of life, moving to insulated panel or Colorbond is the better use of the money.