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Project Roof

How to Waterproof a Leaking Metal Roof

Waterproof your roof in 5 Stages

metal roof waterproofing with liquid rubber and thermal coating stage 1

Stage 1:

Water Blasting

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

metal roof waterproofing with liquid rubber and thermal coating stage 2

Stage 2:

Detailing

Apply Waterproof Sealant in conjuction with GEO Textile over holes, cracks, seams, corners, roofing screws, gaps and protrusions.

metal roof waterproofing with liquid rubber and thermal coating stage 3

Stage 3:

Apply 2 Coats of Waterproof Sealant

Apply Sealer (if previously painted) or Etch Primer (if raw metal) to entire surface.

metal roof waterproofing with liquid rubber and thermal coating stage 4

Stage 4:

First Coat of Thermal Coating

Apply first coat of Thermal Coating to entire surface. (Best to select colour Shale Grey during May to Early Spring)

metal roof waterproofing with liquid rubber and thermal coating stage 5

Stage 5:

Second Coat of Thermal Coating

Apply second coat of Thermal Coating to entire surface. (Best to select colour Shale Grey during May to Early Spring)

Step-By-Step Instructions

1. Wash/water-blast the entire surface.

2. Use a leaf blower to remove excess water to ensure it’s dry.

3. Identify holes, cracks, seams, corners, roofing screws, gaps and protrusions then pre cut Geo-Textile to bridge the defects.

4. Apply Seam Tape to any roof sheet joins.

5. Apply a first coat of Waterproof Sealant with brush, roller or LRDIY spray machine to holes, cracks, seams, corners, roofing screws, gaps, protrusions or over top of Seam Tape (if applied) before embedding the pre cut Geo-Textile - ensure you brush the air from underneath the applied Geo-Textile and make sure there are no crinkles. Refer to the full video below

6. Screws don’t need Geo-Textile,  just a nice blob from your index finger with a glove on followed by Rapid Cure Spray.

Refer to this video.

7. Following the Waterproof Sealant application, instantly spray on Rapid Cure Spray to set product incase of approaching rain or to speed the job up (ensure Rapid Cure Spray is dry before apply second coat with brush or roller). Watch the rapid cure video to see how this is done.

8. Apply a second coat of Waterproof Sealant to the above defected areas - more coats can be applied.

9. Recommended thickness 1.5mm dry-film (2 ltrs./sq. metre).

10. IMPORTANT - Waterproof Sealant must be cured - 24hours per 1mm minimum, longer during cold weather, usually weekend or 2-3 days is ideal.

11. Once cured, wash surface again for any dirt or nature that may have landed on roof surface.

12. Apply Sealer (if previously painted) or Etch Primer (if raw metal) to entire surface.

13. Once dry, apply Thermal Coating to entire surface - 3 coats over Waterproof Sealant or 2 coats minimum over primed metal surface.

PN: During May till Early September select Shale Grey instead of White as it will not cure.