How to repair a cracked roof tile with WATERSTOP Repair Spray

A broken or cracked roof tile can quickly lead to a roof leak if left untreated. Acting early with the right solution helps you repair a damaged roof, prevent water ingress, and extend the life of your roof.

With Bostik WATERSTOP Repair Spray, you can easily repair a cracked roof tile and carry out effective tile roof maintenance, even in hard-to-reach areas.

Discover how simple and effective roof tile repairs can be with WATERSTOP Repair Spray, a high-performing, waterproof coating in an easy-to-apply aerosol can.

Considerations when repairing a broken roof tile

Before you begin

Unlike some products designed for emergency roof tile repair, WATERSTOP Repair Spray should be applied in dry conditions, so always ensure the roof tile is completely dry before starting.

If your roof is leaking and you're in need of an emergency roof leak repair, use WATERSTOP Emergency for a fast-acting fix to stop leaks instantly, even in the rain!

Step-by-step: Broken roof tile repair

What you will need

Bostik WATERSTOP Repair Spray
Stiff brush
Clean cloth
Safety gloves and goggles
Stable ladder

Difficulty

Average time

10-30 mins

Cost

Print version!

Instructions

1. Inspect the tile

Check the extent of the damage. This method is suitable for:

Hairline cracks
Small chips
Minor structural damage

If the tile is severely cracked or damaged, a full replacement may be required instead of a simple broken roof tile repair.

2. Clean the surface

Remove all dirt, moss, and debris using a stiff brush. Then protect the surrounding area from overspray.

A clean surface ensures better adhesion and that the spray provides a longer-lasting tile crack filler when applied.

3. Prepare the spray

Shake the WATERSTOP Repair Spray thoroughly for up to 2 mins. This ensures a smooth, consistent coating for your roof tile repair.

4. Apply the coating

Spray directly onto the cracked or damaged area:

Cover the full crack evenly
Extend slightly beyond the damaged area for a complete application

The spray format makes it ideal for concrete tile roof repair in hard-to-reach areas, where traditional tools are difficult to use.

Need another layer? Allow the first coat to dry (approx. 10-20 minutes) before applying the second coat - it should be dry to touch.

5. Leave to dry

Allow the coating to dry fully. Once cured, it creates a durable waterproof seal that helps seal roof leaks before they develop.

6. Paint over if required

Once the coating has fully cured (typically after 8 hours), it can be painted over if you wish to match the surrounding roof tiles.

Ensure the surface is completely dry before applying paint, and use a suitable exterior paint for the best finish. This allows you to maintain the appearance of your roof while still benefiting from a long-lasting waterproof repair.

7. You're done!

Once painted (if desired) and fully dry, your repair is complete.

The cracked roof tile is now sealed, protected against water ingress, and blended in with the surrounding roof - helping to prevent future roof leaks and maintain the overall condition of your roof.

Top tips for best results

Always apply in dry weather (not suitable for wet surfaces)
Use multiple light coats for durability
Ideal for preventative care
Perfect for accessing awkward angles without direct contact

When should you use WATERSTOP Repair Spray?

WATERSTOP Repair Spray is the perfect solution for:

Repairing cracked roof tile damage before it worsens
Preventing minor issues from developing into a fix tile roof leak problem
Keeping your roof in top condition with regular tile roof maintenance
Protecting hard-to-reach or elevated roof areas with ease

For active leaks or wet conditions, a dedicated emergency solution may be more appropriate.

Let's sum up!

Protect your roof for the long term

Carrying out small repairs early is the best way to avoid costly issues later. Whether you're dealing with minor cracks or carrying out damaged roof repair work, WATERSTOP Repair Spray provides a simple, effective solution.

By tackling issues before they escalate into a roof leak, you can keep your home protected year-round with minimal effort.