There is a 10-14 day lead time on all Rust-Oleum products due to COVID-19, we apologise for the inconvenience

Rust-Oleum Dacfill Waterproofing is a watertight, water-based liquid membrane for roofs.

Rust-Oleum Dacfill Waterproofing is a durable waterproofing for sloped roofs, it is a watertight, water based liquid roof membrane which forms a lasting elastic coat without joint or seams on sloping and pitched roofs (min. 5% slope).  It has been tested and independently approved for asbestos encapsulation which makes it an excellent alternative to asbestos sheet replacement saving cost, time and expensive disruption.

Recommended use
Waterproofing system for roofs, chimney slabs, etc. with a slope of 5% minimum. It builds an abrasion resistant rubberlike coat without joints or seams, which is hardly flammable and self-extinguishing. Additionally it can be reinforced mechanically with Dacfill-fleece.

  • 100% watertight high build system
  • Resistant to UV radiation, acid rain, heat, frost and pollution
  • For many sloped (min. 5%) roof types: bitumen, cementitous, asphalt, plastics
  • Approved for asbestos encapsulating
  • Safe and easy to use
  • Easy to apply with a brush, roller or airless spray
  • Excellent resistance to extreme temperature
  • 10 year guarantee


  Surfaces   concrete, PVC, polyester, iron & steel
  Interior/Exterior   exterior
  Drying time   at 20°C touch dry in 2 hours, dry to handle in 6 hours, overcoat after 24 hours
  Coverage: per coat   0.6 – 1.5 kg/m² dependant on substrate
  Coverage: steep roofs   1.3 – 2.5 kg/m² (without fleece)
  Coverage: gentle slope   0.6 – 1.5 kg/m² (with fleece)
  Shelf life   two years in unopened cans, if stored in dry, well ventilated areas
  Min. app. temp.   +5°C


Surface Preparation

The substrate must be well clean and dry, free from flakes, gravel, dust and dirt. Fill up joints with Elastofill, bridge active cracks with "Dacfill bridging fleece" and apply one of the following priming coats:

  • On porous concrete, hard PVC and polyester : Primer 44 HS
  • On very smooth concrete: Noxyde diluted with 25% water
  • On iron and steel: undiluted Noxyde
  • Asphalt/bituminous: Parafix

Roofing or bituminous materials over 1 year old can be coated directly with Dacfill. Zinc, galvanised steel, copper, lead and aluminium can be recoated with Dacfill, if required, after degreasing and slight sanding.


To ensure homogeneity, coating materials should be thoroughly stirred prior to use


Drying weather: enough air ventilation (light breeze) or sunny conditions. Minimum Temperature: 5°C. Max. Relative humidity: 80%.

Application & thinning: brush
Use a square brush. If necessary dilute with water.

Application & thinning: roller
Use a roller with long hairs (long nap). If necessary dilute with water.

Application & thinning: Airless spray
Nozzle: 18 - 23 / Pressure: 220 bars.

Application & thinning: Air-atomised spray
Not recommended.

Technical Datasheet (PDF)
Safety Data Sheet SDS (PDF)

Write a review

Note: HTML is not translated!
    Bad           Good

Rust-Oleum Dacfill Waterproofing Liquid Roof Membrane

  • Brand: Rust-Oleum
  • Product Code: RO-DACFILLW
  • Availability: In Stock
  • £45.60

  • Ex Tax: £38.00

Available Options