How long will roofing tape last on a cracked tile?

It varies depending on the product, surface preparation, and NZ weather conditions. A good-quality butyl or bitumen flashing tape applied to a clean, dry surface might last one to two seasons, but it should be treated as a temporary fix only. UV exposure and thermal expansion can cause the tape to lift over time.

Can I use regular duct tape or silicone on a cracked roof tile?

No. Standard duct tape is not UV or weather resistant and will fail quickly outdoors. Silicone sealant can work for very minor cracks but doesn't adhere well to dusty or porous tile surfaces and may not cope with water flowing over it. Always use a product specifically rated for exterior roofing use.

Is it safe for a homeowner to get on the roof to fix a tile?

Working at height is one of the most common causes of serious injury in NZ. If you do go on the roof, use a properly secured roof ladder or crawl boards, wear non-slip footwear, and never work alone. If the pitch is steep, the roof is wet, or you're unsure, call a professional roofer instead. Check WorkSafe NZ guidelines before starting.

Will a cracked tile affect my home insurance?

It can. Most NZ home insurance policies require you to maintain your property in good repair. If a leak caused by a known cracked tile leads to further damage and you haven't taken reasonable steps to fix it, your insurer may reduce or decline your claim. Check your policy wording and contact your insurer if you're unsure.

Do I need a building consent to replace a cracked roof tile?

Replacing individual tiles on a like-for-like basis is generally exempt from building consent under Schedule 1 of the Building Act 2004. However, larger repairs or material changes may require consent. Always confirm with your local council before starting significant roofing work.

Roofing Tape for Cracked Tiles: Does It Work?

Roofing tape can be a handy temporary measure to stop a cracked or split tile leaking in the short term, but it's generally not a permanent repair solution. Whether it's worth using depends on the type of tile, the extent of the damage, and how quickly you can get a proper fix organised. Here's what you need to know before you climb up there.

What Is Roofing Tape?

Roofing tape (sometimes called flashing tape or butyl tape) is a self-adhesive, waterproof tape designed to seal joints, laps, and minor cracks in roofing materials. Common products available at Bunnings or Mitre 10 include butyl-backed aluminium tape and bitumen-based flashing tape. Some products are specifically rated for UV exposure and outdoor use — always check the label.

When Roofing Tape Might Help

Roofing tape can be a reasonable stop-gap repair in these situations:

A hairline crack in a concrete or terracotta tile that hasn't fully split
A small chip at the edge of a tile where water could track underneath
As an emergency patch after a storm, while you wait for a roofer to do a proper repair
On low-pitch roofs where water runoff is slower (though low-pitch roofs have their own challenges under the NZ Building Code)

For a temporary fix to hold, the tile surface must be clean, dry, and free of moss, lichen, and dust before you apply the tape. Applying tape to a damp or dirty surface is one of the most common reasons it fails quickly.

When Roofing Tape Won't Be Enough

There are situations where tape simply isn't appropriate:

Fully split tiles where the two halves have shifted — tape won't hold them in alignment and water will still get in
Multiple cracked tiles — this usually signals an underlying problem such as foot traffic damage, structural movement, or aged, brittle tiles that need wholesale replacement
Cracked ridge or hip tiles — these are critical weatherproofing elements and need proper re-bedding or replacement with mortar or a flexible pointing compound
Tiles with broken lugs (the hooks that hang them on the battens) — tape won't stop a tile sliding out of position
Any situation where the roof underlay or sarking beneath is also damaged

Keep in mind that under the NZ Building Code, your roof is part of the building envelope and must adequately shed water (Clause E2 — External Moisture). A botched repair that allows ongoing leaks can lead to costly structural damage and may affect your home insurance claim.

How to Apply Roofing Tape Safely (Temporary Repair)

If you decide to use tape as a short-term fix, follow these steps:

Assess the risk first. Working at height is one of the leading causes of serious injury in New Zealand. Check WorkSafe NZ guidelines before going on any roof. If the pitch is steep, the roof is wet, or you're not confident, don't do it yourself.
Use a roof ladder or crawl boards — never walk directly on tiles, as this causes further cracking.
Clean the area thoroughly with a stiff brush. Remove all moss, lichen, and loose debris. Allow to dry completely.
Cut the tape to overlap the crack by at least 50 mm on each side.
Press firmly along the full length, working out any air bubbles.
Check the overlap with adjacent tiles to make sure you haven't created a dam that will direct water under the surrounding tiles.

Permanent Repair Options

For a lasting fix, a qualified roofer will typically:

Replace the cracked tile with a matching one — this is usually the best outcome for concrete and terracotta tiles
Use a flexible roofing sealant (such as products from Sika) for minor cracks where replacement tiles are hard to source
Re-bed and re-point ridge tiles using appropriate mortar or flexible pointing
Inspect the surrounding tiles and underlay for hidden damage

Matching older tiles can sometimes be tricky in NZ, particularly with discontinued profiles. A good roofer will know local suppliers and salvage options.

Do You Need a Building Consent?

Replacing individual damaged tiles on a like-for-like basis is generally exempt from building consent under Schedule 1 of the Building Act 2004 — but this depends on the scope of work. If you're replacing large sections of roofing or changing the roofing material, consent may be required. Always confirm with your local council before starting any significant roofing work. You can find general guidance at MBIE Building Performance.

When to Call a Professional

Call a qualified roofer if:

The crack is large, the tile is fully split, or multiple tiles are damaged
You can see daylight, staining, or moisture in your ceiling or roof space
The damage is on ridge, hip, or valley tiles
You're not comfortable working at height
The roof pitch is steep or the surface is slippery

Roofing work is not legally restricted in the same way as electrical or plumbing, but it does carry serious fall risks and poor workmanship can void your home insurance or cause expensive water damage. For peace of mind, it's worth getting a Licensed Building Practitioner (LBP) or experienced roofer to assess the damage. You can find qualified local roofers on tradedirectory.co.nz.

Can I Use Roofing Tape to Fix a Split or Cracked Roof Tile?