If you want to avoid costly re-roofing, or get a few more years out of your garage or shed roof before it really starts to deteriorate, then Roof Waterproofer is the product for you.

  • Cost effective waterproofer – no high bills and hidden extras
  • Don’t let your roof be ‘out of sight, out of mind’
  • Prevention is better (and far cheaper) than cure
  • Flexible – doesn’t crack or split
  • Can be applied in the rain for emergency repairs
  • Really easy to apply

The basics

You’ll need

  • 5" Paint Prush

This product is available on our website and can be shipped with your order for Roof Waterproofer so you can get the job done quickly.


Roof Waterproofer is supplied in 5kg containers.

Instructions for use


Weatherproof your roof against the elements by using Roof Waterproofer, the easy, most cost effective way to refurbish or repair roofs. It’s a flexible, strong, bitumen and fibre based waterproofer that not only protects and preserves your roof, it extends the life of it too. Roof Waterproofer is black but weathers down to grey over a period of time. It resists both water and direct sunlight and doesn’t crack or split. It is effective on most types of roof, including tiled, concrete, corrugated iron and felt. We particularly recommend it for flat roofs and sheds. For outdoor use only.

Prepare It

You can apply Roof Waterproofer when it’s pouring with rain in an emergency. For long term repairs the surface should be as dry as possible. Remove dirt, moss and other loose material with a wire brush. A fungicide may be used where applicable.

Apply It

Load the brush generously and apply 1m² per kilo of Roof Waterproofer. If you need a second coat then apply it at right angles to the first one. Don’t brush out to a thin film – the idea here is to apply a good thick coating.

Tip – for larger splits and cracks, apply a coat of Roof Waterproofer, then mix some dry sand with more Roof Waterproofer to produce a mortar which can be applied with a trowel. Also, if you purchase the Garage Roof Waterproofer kit, it comes with a roll of scrim. This scrim can be used to reinforce any vulnerable areas, such as joints or areas you suspect are leaking. All you need to do is apply one coat of Roof Waterproofer, then one layer of scrim (easily cut with scissors), followed by a further coat of Roof Waterproofer. This creates a ‘sandwich effect’ which gives it that added protection.

Dry It

After about 24 hours a surface skin forms. Once all moisture has evaporated then setting begins.

Cover It

Covers approximately 5m² per 5kg container.

Clean It

Clean applicators with White Spirit before the product sets.

What else do I need to know?

Don't use:

Don't use Roof Waterproofer on bare wood.

Do not use on EPDM rubber roofs. Test on a small area if in doubt about product suitability.

Store It

The shelf life of Roof Waterproofer, if unopened, is one year. Do not allow to freeze.

Disposal and Safety information

Please see the Material Safety Data Sheet.