Introducing Asbestos Encapsulation

Asbestos encapsulation

Asbestos has historically been used in many types of building products until its use was made illegal on 24th November 1999. Despite this, there are still an estimated 1.5 million non-domestic properties containing asbestos. Inhaled asbestos contributes to around 3,000 deaths a year from asbestos related diseases – this is set to rise to 10,000 deaths a year by 2030. Promain’s technical team would like to introduce the method of asbestos encapsulation via Rust-Oleum Dacfill as a safe, low risk solution to removal.

Why Standard Paints Aren’t Suitable For Asbestos

Asbestos Encapsulation

Due to the nature of paint, preparation is the key. This ensure a coating lasts as long as you hope. Because dealing with asbestos is so risky, preparing roofing or cladding by removing previous coatings is impossible without legal permits and in accordance with CAWR (Control of Asbestos at Work Regulations). This can lead to further expense and real danger to people and the environment.

Another factor to consider is the movement asbestos construction materials. Any paint required to coat the surface must be able to withstand the thermic expansion and contraction during different temperatures.

The Solution of Asbestos Encapsulation

There is a clear need to implement safety measures when encountering asbestos in buildings in order to prevent the release of harmful fibres into the air. Possibly the safest and most cost-effective method is asbestos encapsulation within a seamless, protective coating. This involves relatively little disturbance of the material, therefore minimising the risk.

There are a number of benefits to encapsulating asbestos rather than attempting to remove it. Firstly, it eliminates the need to dispose of the removed asbestos, a process which can be costly and is subject to strict controls. You can complete encapsulation work quickly. This reduces disruption, on-site time, and all of the extra costs.


Introducing Encapsulation With Rust-Oleum Dacfill

Rust-Oleum Dacfill is a professional grade product formulated for the renovation and protection of asbestos cement roofs and vertical sheeting. Due to the products thick high solid content, application will encapsulate asbestos fibres within the structure of the sheeting. This protects you, your family, neighbours and the public from the hugely damaging effects of asbestos inhalation.

Rustoleum Dacfill Roof Paint from Promain
Rustoleum Dacfill Roof Paint from Promain

Available in various stock colours, Dacfill is a semi fluid product that can be applied via brush, roller or airless spray gun. During the drying process the Rust-Oleum Dacfill will form a uniform, rubber like seamless coat – even on the most complicated roofing configurations. Dacfill boasts 400% elasticity and is 100% waterproof. It is also durable, can resist severe weather conditions and pollutants. This makes Rust-Oleum Dacfill the ideal product for encapsulating asbestos roofs or cladding.



Rust-Oleum Dacfill System Requirements For The Encapsulation of Asbestos

Prepared By: N. Morgan    |    Dated: 08/06/04


  1. Inspection

  • Check for algae, moss, dirt, dust, etc.
  • Some open joints, connections. Ensure the asbestos is in general sound condition.


  1. Preparation

  • Apply Rust-Oleum AMW Fungicidal Wash to the roof leave for 3 days.
  • Clean with high-pressure water (min. 150 bar and rotating head encapsulated cleaning.)
  • Inspect all fastenings, replace the failed ones. Replace any cracked or damaged sheets.
  • Brush, de-rust and with brush apply a thick coat of Rust-Oleum Noxyde on the fastenings and all other metallic parts.
  • After drying: priming of all surfaces with Rust-Oleum Primer 44 diluted with 30% Rust-Oleum Thinner 22.
  • Prime any metallic junctions with one layer of Rust-Oleum Noxyde diluted with 20% of water.
  • Allow to dry for 24 hours.
  • Fill up openings between plates, junctions with sky domes, junctions with parapets with Rust-oleum Elastofill. Allow to dry.


  1. Coating System

For Asbestos Roof Encapsulation

a) Connection with skylight

  • Use a piece of Rust-Oleum Dacfill Mesh and stick it over the junction with Rust-Oleum Dacfill through the mesh.
  • Locally, apply the same system over the joints which are too open as well at the connections with walls

b) Entire Corrugated and border plates

  • Apply overall two coats of Rust-Oleum Dacfill (consumption: 1kg/m2 per coat) in a contrasting colour.


  1. Conditions of Application

  • Carry out the works during stable and dry weather, furthermore to a clean substrate.
  • Respect a drying time of 24 hours, unless it is stipulated otherwise by Rust-Oleum or Promain directly.
  • Minimum temperature of the substrate and ambient air: + 5°C, preferably 15 to 25°C.
  • Maximum temperature of the substrate: + 55°C.



If the metals are corroded, replace “Rust-Oleum Noxyde diluted with 20 % water” by pure Noxyde. This specification assumes your gutters are clean and functional to wall joints as part of specification.



If you have any doubts or questions in regards asbestos encapsulation, it is important to contact Promain‘s technical team prior to any dealings with asbestos. Most importantly, asbestos is a dangerous material. It is vital you deal with it safely to protect you, your staff and the public. In conclusion, contact us on 01462 421333.

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