What to use to cover bitumen rubber on roof?

[Cedes]

I need to choose which one of the following to use over the bitumen paint on the roof.

Bunnings AI

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• Bunnings AI

  Need help deciding if the Gripset Betta 1L Waterproofing Membrane Bitumen Rubber is right for your needs? Ask me anything.

  Is it suitable for outdoor use?Can it be painted over?How long does it take to dry?
• Can it be painted over?

• Bunnings AI

  Yes, the Gripset Betta 1L Waterproofing Membrane Bitumen Rubber can be painted over. It is a versatile product that can be used as both a waterproofing membrane and a bitumen paint. If you are planning to use it as a paint, you should dilute it with water in a 1:1 ratio as per the instructions.

  If you need guidance on the best type of paint to use over this membrane or advice on proper application, please let me know! Would you like more details on the painting process or have any other questions about this product?
• Yes. What paint can be used

• Bunnings AI

  Could you please clarify what type of paint you're looking to use over the Gripset Betta Waterproofing Membrane Bitumen Rubber? Are you interested in exterior paint, interior paint, masonry paint, or another specific type? This will help me recommend the most suitable options for your project.
• Roofing paimt

• Bunnings AI

  Here are some search results for roof paints, roof spray sealants, roof waterproofing coatings, and roof treatment concentrates you might like:

  

  Selleys 310g Translucent Roof And Gutter Silicone Sealant

  4.6 (32)

  $14.45

  

  Fastfix Wet Shield 1kg One Coat Instant Waterproofing

  4.1 (8)

  $41.92

  

  Ametalin 1500mm x 30m SilverSark HD Reflective Roof and Wall Insulation

  5 (2)

  $94.82

  

  Selleys 315g Roof and Gutter Spray Sealant

  3.9 (18)

  $24.50

  

  30 Seconds 5L Roof Treatment Concentrate

  4 (25)

  $55.49

  View more
• Can i use these on top of bitumen?

• Bunnings AI

  Some roof paints and coatings are suitable for application over bitumen-based membranes, but it's important to check product compatibility for best results and longevity.

  Here’s what you should consider for the products listed above:

  • Selleys Roof and Gutter Silicone Sealant: Designed for sealing gaps and cracks on various roof materials (metal, tiled, concrete, etc.) and can be used over bitumen, but it is a sealant rather than a paint or coating. It may not provide an even, paint-like finish.

  • Fastfix Wet Shield One Coat Instant Waterproofing: Suitable for most common roofing surfaces, including bitumen. This is a reinforced waterproofing compound and can be used as a protective top coat.

  • Crommelin High UV Resistant Roof and Wall Waterproofing: Crommelin membranes are typically compatible with bitumen and can be applied over existing bitumen membranes (confirm with manufacturer guidelines for the specific surface prep required). Once cured, they can be overcoated with acrylic paints.

  • Dulux Weathershield Exterior Paint: Generally designed for direct application on masonry, concrete, and metal. If you wish to use it over bitumen, ensure the membrane is fully cured, and confirm with Dulux or test a sample area first as adhesion may vary.

  • Other products (spray sealants, cleaning treatments, insulating foils): These are not designed as top coats or paints for membranes and may not be compatible.

[EricL]

Hello @Cedes 

Thank you for sharing those photos of your roof. I propose using Selleys 310g Translucent Roof And Gutter Silicone Sealant to seal the surface of the bitumen rubber. This would be an alternative to putting more bitumen on the surface. Unfortunately, it is very difficult to track down the leak that is somehow bypassing the sealant you've already applied. I can only suggest giving it a try and see if it stops the leak coming into your house.

Eric

[Cedes]

@MitchellMc 

Ahh ok, so the 1/8 inch gap along both sides is just too wide that even though it appears to have sealed it, it hasn't really?

It's not a roofing sheet. It's a gap which happens when unfolding the roof on a tiny home kit. It's like a drop shelf, the mechanucs of it. You just lift it up from being vertical and it becomes horizontal. That gap is then needing filling. It's got one on each side of the "middle" bit which they open up onto to form a roof. Like a square umbrella I guess.

@EricL 

Thanks Eric.  I ordered a bucket of clear sealant used on caravans which I plan to try over the weekend. Hopefully it'll do the trick. 😊

[MitchellMc]

@Cedes,

Yes, bitumen isn’t great at covering wide gaps like that. It’s probably done a reasonable job of trying to seal it, but there may be sections where it hasn’t quite been able to bridge the full gap and has developed fine cracks. I’d suggest going along that area and checking closely for any small splits that might have formed after drying.

Sometimes it looks like it’s sealed initially, but as the bitumen dries it can shrink slightly and open up small gaps again. You might find that applying another couple of coats will help build up the layer and create a more solid seal. I’d try adding up to five coats if needed. That should form a good, thick band of bitumen bridging from the top section down over the joint and onto the roof panel. 

Mitchell