Karnak 19 Ultra

Karnak 19 Ultra (4)

The revolutionary new ‘Rubberised Flashing Cement’


Permanent, underwater repairs now available to the UK market…
The Product:
Karnak #19 Ultra rubberised flashing cement is the next generation in emergency waterproofing solutions. Scientifically compounded with a selection of rubber reinforced asphalt, mineral fibres and refined solvents. #19 Ultra is a heavy, pliable consistency for easy application by trowel. #19 Ultra contains special chemical ingredients which give it unique water displacement qualities for permanent underwater repairs. #19 Ultra dries to a tough, flexible, waterproof and corrosion proof rubber coating which gives maximum protection and performance over a wide range of temperature and weather conditions.

Surface Preparation:

All surfaces should be clean and free from grease, oil, dust, dirt, loose paint and other foreign matter. Remove excess water where possible. If this isn’t possible don’t worry, #19 Ultra can be applied and will fully cure underwater!


Spread Karnak #19 Ultra Flashing Cement to an average thickness of 3-4mm and press tightly into joints, seams or cracks.
Embed Karnak Reinforcement Membrane into the #19 Ultra.
Apply an additional coat of Karnak #19 Ultra over the entire patch, again at 3-4mm.

Your patch repair is now complete

Can be applied for a permanent repair even UNDERWATER!

Karnak #19 Ultra Key Benefits
Excellent adhesion on:
  • Wet or Dry application
  • Adheres underwater, first time, every time
  • Rubberised – Elastomeric
  • Superior water and weather resistance
  • Will not shrink or crack
  • Smooth, rubber-like consistency
  • Excellent adhesion
  • UV stable
  • Easy and ready to apply, no mixing required
  • Permanent underwater repairs
  • Excellent ‘sag’ resistance for use on vertical surfaces
  • Quick curing
  • Bitumen
  • Felt
  • Shingles
  • Tiles
  • Metal
  • Asphalt
  • Downpipes
  • Vertical walls
  • Chimneys
  • Flues
  • Skylight flashings
And much more…

For more information on the Karak 19# Ultra please give us a call on 01452 713 400 or email sales@the-roof-shop.co.uk