What Winter Just Told You About Your Roof (and What to Do in September)

Quick answer: Winter is the honest season — it shows you exactly where your roof is weak, and September is the window to act on it while the evidence is still fresh and before the summer booking rush fills up.

Most people check their roof before winter. Fair enough. But the more useful check is the one you do after it. Four months of southerlies, nor’west gusts and horizontal Horowhenua rain will have found every weak flashing, every tired lap and every blocked downpipe on your place. All you have to do is read what it left behind.

Here’s the walk-around we’d suggest — all of it from the ground, none of it on a ladder.

1. Photograph every stain before it fades

Ceiling stains dry out and go pale over spring. That faint brown ring above the hallway in July can be almost invisible by November — and then it’s back next winter, bigger. Take a photo now, with the date on it. Note which room, which corner, and whether it appeared during driving rain from a particular direction.

That direction matters more than you’d think. A stain that only shows up in a southerly usually points to a flashing or lap that’s fine in still rain but lets go when the wind drives water uphill.

2. Check what the spouting did, not what it looks like

Dry spouting tells you nothing. Wait for the next decent downpour, stand under the eaves with a raincoat on and watch. You’re looking for:

• Water sheeting over the front edge instead of running to the downpipe
• A joint dripping in a steady line down the weatherboards
• Spouting that’s visibly bellied or sitting lower in one spot
• A downpipe that’s silent while the others are roaring — that one’s blocked

Overflow marks show up as a dark tide line on the fascia or a green stripe down the wall below. If your place is under a liquidambar or a poplar, winter has almost certainly packed the spouting with leaf mulch.

3. Look at the roof from across the road

Get 20–30 metres back and look along the lines. On long-run or corrugate iron you’re looking for ripple or dishing between purlins, ridge capping that’s lifted at one end, and rust blooming around fixings — it shows as rusty freckles in neat rows. On the 1970s concrete tile roofs around Levin, look for slipped or cracked tiles, hip caps with mortar crumbling out, and any dip in the ridge line.

Coastal streets — Waitārere, Hōkio, Foxton Beach, Waikawa — will show it first at the ends of sheets and around fasteners, where salt sits and never quite washes off.

4. Note the moss and lichen, but don’t panic about it

South-facing slopes and anything shaded by a fence or a big tree will green up over winter. Light lichen on a sound roof is cosmetic. Thick moss holding moisture against old, thinning steel is a different story. The tell is what’s underneath it — if the coating has gone chalky and dull around it, that’s age, not dirt.

5. Be honest about the fifth winter in a row

If you’ve had the same drip in the same spot for a few seasons and it’s been “sorted” twice with sealant, winter has told you plainly: it’s not a sealant problem. Repeated patch-ups on the same flashing are usually a sign the detail was wrong from the start.

When you don’t need to call us

Plenty of what shows up after winter isn’t a roofing job:

• Damp patches on the ceiling corners of a bathroom or an unventilated bedroom, with no matching stain path — that’s usually condensation, not a leak.
• A gutter full of leaves on a single-storey home, if you’ve got a safe way to have it cleared.
• A bit of lichen on a roof that’s under ten years old.
• A one-off drip during the worst storm of the year that hasn’t come back since.

We’d rather tell you it’s fine than sell you work you don’t need.

Why September is the month to act

Three reasons. The evidence is still fresh, so a leak assessment has something to chase. Insurance conversations go better when the event and the damage are recent and documented. And roofing books out over summer — the people ringing in November for a job before Christmas are often the ones who noticed the stain in August.

If your roof’s told you something this winter and you’d like a straight answer on it, give us a ring on 0800 706 337. A full replacement quote comes with a free aerial measure — we measure from the air, so nobody’s walking your roof to price it. If it’s a leak you want traced, our Leak Assessment is a paid, hands-on service that finds the actual cause rather than guessing at it. We work Levin and the Horowhenua, Himatangi down to Te Horo.

Quick questions

Is September too early to book a re-roof for summer? No — it’s about right. Booking in spring means you get a slot in the settled weather rather than waiting on it.

I’ve got a stain but no active drip. Worth looking at? Yes. A dry stain means water got in and stopped, not that the path has closed. Photograph it and get it checked while you can still see it.

Do you guarantee repairs? Our 5-year workmanship guarantee applies to complete roof replacements only. Repairs are done properly and documented, but the guarantee sits with full re-roofs.

— Slade, Licensed Building Practitioner · Aquashield Roofing, Levin & the Horowhenua