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Project Box Gutter

How to Waterproof a Leaking Box Gutter

Waterproof your Box Gutter in 6 Stages

Stage 1:

Water Blasting

Wash/water-blast the entire surface. Use a leaf blower to remove excess water to ensure it’s dry.

Stage 2:

Detailing

Apply Waterproof Sealant in conjuction with GEO Textile over holes, cracks, seams, joints, pipes.

Stage 3:

First Coat Waterproof Sealant

Stage 4:

Second Coat Waterproof Sealant

Apply second coat of Waterproof Sealant by Spray maschine or Brush/Roller to the entire Box Gutter.

Stage 5:

Broadcasting Grit

Broadcast Grit into the wet Waterproof Sealant.

Stage 6:

Tough Coat Mixture

Mix Tough Coat with Tough Coat Hardener and apply the first coat onto the entire box gutter surface. Apply a Second Coat 4 - 12 hours later (with a fresh mixture)

Build and Customise Your Box Gutter Repair Kit

Enter the length of your Box Gutter.

Or Select from our ready-to-use box gutter bundles.

Box Gutter Sealing Gallery

Step-by-Step Instructions

1

Prepare the Surface

  • Wash or water-blast the entire gutter surface to remove dirt, debris, and rust.
  • Use a leaf blower to remove excess water and ensure the surface is completely dry.
2

Reinforce Vulnerable Areas

  • Pre-cut Geo-Textile to fit over seams, joins, around downpipes, and rust holes.
  • Use the Rubber - Geo - Rubber method:
  1. Rubber: Apply a layer of Liquid Rubber Waterproof Sealant over these areas.
  2. GEO: Place the Geo Textile on top of the wet sealant.
  3. Rubber: Cover with another layer of rubber sealant to ensure full encapsulation.
  • Ensure there are no wrinkles or air bubbles.
  • Spray Rapid Cure Spray on the final wet layer to instantly set the product.
3

Apply Waterproof Sealant to Entire Surface

  • Apply the first coat of Waterproof Sealant to the entire gutter surface or the reinforced areas using a brush, roller, or spray machine.
  • Apply Waterproof Sealant to surface rust, rain heads, and into downpipes for extra protection.
  • Allow the coat to dry (24h) and spray Rapid Cure Spray if needed to speed up curing, especially if rain is approaching.
4

Apply the Final Coat with Grit

  • Apply a second coat of Waterproof Sealant evenly across the surface, ensuring a dry-film thickness of approximately 1.5mm (1 litre per linear meter).
  • Before the final layer of Waterproof Sealant dries, evenly broadcast Grit across the wet surface. This adds texture and ensures optimal adhesion between the Tough Coat and the Waterproof Sealant and ads slip resistance.
  • Spray Rapid Cure Spray to set the product and allow it to dry fully.
5

Finish with Tough Coat

  • After the Waterproof Sealant has fully cured (24 hours per mm of thickness, longer in cold weather), apply 2-3 coats of Tough Coat mixed with Tough Coat Hardener for a durable, colored finish. Use a brush or roller for application, allowing each coat to dry thoroughly before the next.

Additional Tips

  • Use our Box Gutter Project Calculator to determine exactly how much product you’ll need. 
  • Apply products early in the morning or late in the afternoon to avoid intense sunlight.
  • Ensure the surface is completely dry before application to prevent adhesion issues.
  • For Drinking Water Collection: If you’re collecting rainwater for drinking purposes, disconnect the downpipes for the first downpour to allow the system to wash thoroughly before reconnecting. Alternatively, once the Tough Coat has fully cured, you can power wash the surface and then reconnect the downpipes.