Customers Also Purchased
Asbestos Roof Sealer and Primer is a brush or spray applied, translucent solution formulated to bind, seal and consolidate the surface of old, friable asbestos roof sheets, encapsulating harmful dust and fibres. It also improves the moisture resilience of the surface. Non-hazardous, suitable as both interior and exterior asbestos sealer.
Bio-wash Roof Cleaner is formulated for the effective removal of moss and other organic growth from almost all types of roofing materials. It is also essential for the suppression of moss growth post cleaning, which would otherwise quickly re-invade the freshly cleaned surface.
Asbestos Roof Coating
Along with our Asbestos Roof Sealer and Primer, Kingfisher Asbestos Roof Coating is a solvent-free system for efficiently waterproofing and improving the appearance of corrugated asbestos cement roof sheets for up to 10 years. It is manufactured from polymers selected for their adhesion to porous surfaces and their longevity once cured.
- Seals porous asbestos cement roof sheets, coating the surface with a tough “shell”
- Also suitable for asbestos roof tiles
- Repairs asbestos cement roof leaks
- Decorative satin finish is Ideal for asbestos roof renovation
- Allows you to safely paint asbestos roof sheets, encapsulating harmful fibres
- Provides long term weather protection and colour stability
- Apply by brush or high-pressure spray
- Highly durable weatherproof finish with excellent UV resistance
- Can reduce need for specialist asbestos removal
- Coverage: 4-6m² / litre per coat
Before explaining the benefits of the product, it is worth reflecting on a few points about asbestos cement (AC) roofing which explain why the material might be worth saving in the first place. Leaving aside for a moment the very real health concerns associated with its original manufacture and installation, AC sheets were hugely successful for the following reasons:
a) They were and are a highly durable material.
b) They were extremely versatile
c) Compared to corrugated tin sheets they were quieter in heavy rain
d) They did not suffer from condensation in winter
This last point is really important because compared to corrugated “tin” or steel box profile AC sheets do not “rain” condensation in cold weather. Many people have replaced asbestos roofs with steel sheeting only to regret the decision. Of course the modern equivalent of AC is cement fibre sheeting but these are usually more costly to install.
Kingfisher Asbestos Roof Coating was developed to provide users with 3 x key benefits:
SAFETY - FIBRE ENCAPSULATION
PERFORMANCE – RESTORES WATERPROOFING
AESTHETIC APPEAL – ATTRACTIVE SATIN FINISH IN VARIOUS COLOURS
Managing asbestos in buildings is a legislated obligation for property owners and is of particular concern for those involved in letting, occupying, marketing or maintaining commercial and industrial properties. This is largely because asbestos cement was used very extensively in such buildings for decades, before the full extent of its toxicity was properly understood.
Asbestos containing materials (ACMs) are also found in domestic flats and houses, although generally to a lesser extent.
As a versatile and heat resistant material, it was used in its varied forms in the manufacture of heat shields, gaskets, heating plant, flooring and roofing to name but a few. And since it was never going to be practical or indeed necessary to remove all asbestos after it was banned in 1999, the focus since then, has been on managing the risks associated with it, several of which pertain to asbestos cement (AC) roof sheets. Asbestos Roof Coating can help with managing such risks by acting as a fibre encapsulator, as well as a waterproof finish.
How Does it Work?
Asbestos Roof Coating is manufactured using premium grade polymers, specially selected for roofing applications requiring exceptional durability, U.V resilience and waterproofing qualities. As the coating cures it keys to the surface, forming a permanent bond which encapsulates the fibres in the sheet substrate, preventing them from being exposed either by weathering or abrasion.
If Asbestos Sealer & Primer has been used to prepare the surface for coating, impact protection is further enhanced as it hardens the surface thereby reinforcing the Asbestos Roof Coating’s mechanical strength.
Here in the U.K, asbestos roof sheets were manufactured and installed for most of the 20th Century. The familiar corrugated profile sheets helped thousands of military buildings to be rapidly assembled in kit form during WW2, and these can still be found to this day, scattered throughout the country. The point is that asbestos cement roofing (white asbestos) is a very durable material, which in a majority of cases has outlived its anticipated lifespan by decades. In fact Kingfisher has been involved in supplying sealers and coatings to roofs which date as far back as the 1930s! This means that building maintenance professionals and property owners are likely to be maintaining asbestos roofs for many years to come and will need technically superior coatings to facilitate that.
Repair or Replace?
Although the “white asbestos” (chrysotile) used in the manufacture of roofing sheets was the least toxic asbestos variant, it is still has the potential to be hazardous, which is why the management and removal protocols are strictly enforced. The cost of complete removal and replacement of asbestos cement roof sheets, can therefore be considerable, often prompting stakeholders to consider repair options.
The second option considered, especially in storage or agricultural buildings is to simply replace the asbestos sheets with modern plastisol coated, steel profile sheeting. However, it is worth remembering that one of the major reasons why asbestos cement roof sheets became so popular in the first place, was that compared to corrugated “tin” (steel profile), they did not suffer from condensation. By contrast, “tin” roofed buildings famously rained condensation on workers, stock, machinery, farm animals or anything else unfortunate enough to be inside.
Of course you can opt for composite insulated panels that won’t exhibit condensation but they are at least 2.5 times the cost! Or you can choose modern cement fibre roof sheets (nearest equivalent to the old AC sheets) but these are also more costly than steel profile. So for example, if you store your classic car in a garage with an asbestos roof, it may be that this is as at least as good an option as modern cement fibre and definitely better than new steel profile. Repair & re-coating should at the very least be considered.
How to use Asbestos Roof Coating?
1. “Bio Wash” Roof: (kills moss, green mould & lichens) Liberally spray the entire roof surface with Kingfisher “Bio Wash” using a low pressure sprayer (as for garden weed-killer) and leave for seven days to activate.
2. Clean Roof: (remove debris) Thoroughly damp the roof by mist spraying with water (suppresses release of harmful fibres) and brush/ scrape the dead moss and other surface dirt and laitance into bags for disposal as AC waste. Alternatively for larger areas the “closed box” pressure washing method described in HSE doc A12 can be used but the waste sludge and water run- off have to be collected in the gutters and down pipe.
3. Repair Roof: General Sealers and coatings should only be applied to essentially “sound” roofs so a pre-inspection of the roof structure and surface condition should always be undertaken by a competent person (e.g. experienced roofing contractor or structural engineer) before commencing works. This will determine whether the supporting steel / timbers are in need of repair and identify any cladding / roof sheets which are damaged or decayed beyond practical repair and therefore need complete replacement. In addition this inspection will typically inform the choice of access equipment to be used for safe execution of the works.
4. Minor Repairs: Any minor cracks or holes, especially around fixings can be filled with “Parabond” hybrid polymer sealant. Cracks of up to 3mm can be successfully filled by applying a bead of “Parabond” along the crack and then pressing / smearing it firmly into the damaged area.
5. Larger Repairs: Bigger cracks or holes can be bridged with “Kingfisher Fibreseal” fibre reinforced roofing compound & “Kingfisher Scrim Mesh”.
6. Primer: Apply one coat of Kingfisher Asbestos Sealer & Primer by brush or low pressure (non-atomising) spray to consolidate and harden the substrate.
7. Application: Apply 2 x coats of Asbestos Roof Coating by brush or high pressure airless sprayer. Cut-in edges and around detailing such as roof-lights, vents etc. with a premium grade paint brush. Generally allow 6 to 8 hours between coats although in warm conditions this may be reduced to as little as two hours. If applying by sprayer, ideally use a 17 thou tip blade (nozzle size) and set the output pressure to 2500 psi.
How much will I need?
The coverage rate is 4 to 6 sq m per litre, so a 10 litre pail treats approximately 50 sq m.
a) Do not apply to damp surfaces or in wet weather
b) Always consult a competent Health & Safety professional for guidance on working at height, especially on fragile surfaces like AC sheeting.
c) Ensure you inform yourself regarding correct PPE and waste disposal protocols for working with asbestos cement roof sheets.
Technical Support: As always we recommend that you read the Technical Data Sheet & Safety Data Sheet thoroughly before commencing any work. If in doubt please call us for advice, we are here to help.
Full application instructions can be found in our "How To" guide.
Also available as part of a Garage
“Kingfisher Asbestos Roof Coating” is an advanced styrene acrylic polymer coating system specifically designed to completely renovate and transform tired Asbestos Cement (AC) roof sheets. Using advanced micro-polymer technology Kingfisher has produced a highly durable product which not only seals porous roof sheets but also transforms and enhances the appearance of the roof. “Kingfisher Asbestos Roof Coating” provides a tough fibre encapsulating “shell” finish which prevents the release of potentially harmful dust particles. Installed under the correct conditions and procedures “Kingfisher Asbestos Roof Coating” with its UV light protecting elements will provide long term weather protection and colour stability for 10 years.
Companion / Related Products:
• Kingfisher “Bio-Wash”
• Kingfisher “Asbestos Sealer & Primer”
• Kingfisher “1 for All” hybrid polymer sealant
(Refer to these individual product data sheets for detailed application guidance – published on our website
Use on: Domestic, commercial, agricultural and industrial buildings fitted with asbestos cement roof sheets and some cement fibre sheets also. If in doubt, please call our technical services department on 01229 869 100 for guidance. “Kingfisher Asbestos Roof Coating” is for use on pitched AC roofs only, where it is impervious to mass water penetration.
• Ease of application by brush or high pressure spray
• Highly durable weatherproof finish with high UV resistance
• Extends roof surface life by 10 years
• Fibre encapsulating.
• Tools can be cleaned with soap and water after use.
1. Pre-treat roof with “Bio Wash” (kills moss, green mould & lichens)
Liberally spray the entire roof surface with Kingfisher “Bio Wash” using a low pressure sprayer (as for garden weed-killer) and leave for seven days to activate. This effectively sanitises the roof surface by killing the obvious areas of growth as well as the hidden spores buried deep in the substrate and overlap joints.
2. Clean Roof (remove debris)
Thoroughly damp the roof by mist spraying with water (suppresses release of harmful fibres) and brush/ scrape the dead moss and other surface dirt and laitance into bags for disposal as AC waste. Alternatively for larger areas the “closed box” pressure washing method described in HSE doc A12 can be used but the waste sludge and water run off have to be co llected in the gutters and down pipe. This involves diverting all run off into one down pipe usually temporarily modified on site to divert the water into a mobile water filtration system. Allow to dry.
Note: DO NOT pressure wash asbestos with a lance attachment as this may result in the uncontrolled release of potentially harmful asbestos fibres. There is a highly informative two page document covering this on the HSE web site, reference number A12 which can easily be downloaded for your further reference.
3. Repair Roof
General: Sealers and coatings should only be applied to essentially “sound” roofs so a pre- inspection of the roof structure and surface condition should always be undertaken by a competent person (e.g. experienced roofing contractor or structural engineer) before commencing works. This will determine whether the supporting steel / timbers are in need of repair and identify any cladding / roof sheets which are damaged or decayed beyond practical
repair and therefore need complete replacement. In addition this inspection will typically inform the competent person’s choice of access equipment to be used for safe execution of the works.
Minor Repairs: Any minor cracks or holes, especially around fixings can be filled with “Kingfisher 1 for All” hybrid polymer sealant. Cracks of up to 3mm can be successfully filled by applying a bead of “1 for All” along the crack and then pressing / smearing it firmly into the damaged area. We recommend wearing disposable latex gloves for this task as the hybrid polymer, whilst neutral in its formulation is very highly adhesive! “1 for all” is fully over-
paintable once cured but try to avoid applying primer to it. Note: Kingfisher “Multi-task” wipes are formulated to quickly remove “1 for all” from skin and tools before it cures.
Larger Repairs. Bigger cracks or holes can be bridged with “Kingfisher Fibreseal” – a thixotropic fibre reinforced roofing compound & “Kingfisher Scrim Mesh”. Apply one coat of “Fibreseal” to the affected area and bed the fine mesh into the “Fibreseal”, then leave to cure. Once cured apply a second coat over the mesh. Avoid applying the “Asbestos Primer” to this repair and leave for a minimum of 2 days before applying “Kolourseal” or “Asbestos Roof Coating”.
4. Prime Roof
Apply one coat of Kingfisher “Asbestos Sealer & Primer” by brush or spray. DO NOT over apply. Brush out any runs which may occur. The material should have soaked into the surface after approximately 20 minutes. Drying time will vary dependin g on the surface porosity and ambient temperature, but normally 4 – 8 hours should be allowed for each coat to fully dry. However, it is better to apply subsequent coats of “Kolourseal” or “Asbestos Roof Coating” whilst the primer still has a slight “tackiness” as this aids adhesion.
Apply 2 x coats by brush or airless spray. If applying by brush use a high quality masonry paint brush, working in broad even strokes, taking care not to over-apply. Pay close attention to sheet edges and corners ensuring that the coating is worked well into all crevices and joints.
If applying by high pressure spray, we recommend a typical GRACO 4900 or 5900 series airless sprayer with the pressure set at 2500 psi and fitted with a 517 nozzle tip blade (17 thou) for optimum performance. Ensure that roof -lights and vents etc. are protected from over-spray and take precautions to avoid spray drift contamination of vehicle finishes in the vicinity.
Apply only in dry conditions to a dry surface, with no rain expected for at least 24 hours post application. As with all water based treatments, please be aware that you need to plan any exterior works to allow sufficient drying time for the product to cure before the evening dew point, especially in the shorter days of winter. On a roof surface warmed by the summer sun “Kingfisher Asbestos Roof Coating” will dry in under an hour, permitting two coats to be applied in one day whereas in winter initial cure can be 4 hours so only one coat is possible.
DO NOT apply at air or surface temperatures below + 6 °C.
5 - 6 m² per litre depending on the porosity of the surface.
|Coverage||5-6m2/ litre per coat|
|Initial Cure||4-8 hours at 200C|
|Full Cure||24 hours at 200C|
|Application Temperature||+60C to +350C|
|Service Temperature||-200C to +500C|
Store in original packaging in a cool dry place, out of direct sunlight and protect from frost.
Note: Once frost damaged the product is unusable (this will be immediately apparent if any attempt is made to apply it!) and cannot be recovered by warming up or any other means.
The product has a shelf life of 12 months from the date of manufacture, subject to correct
Health & Safety
• If applying by spray wear a face mask (FFP3).
• When preparing and cleaning the surface wear a face mask (minimum FFP3).
• Wear disposable gloves and overalls during preparation and application.
• Avoid contact with skin and eyes.
• If contact occurs wash immediately with plenty of water.
• Keep out of reach of children.
• Ensure good ventilation during application and drying.
• Always dispose of empty packaging responsibly.
The product is non-hazardous in normal use.
Note: AC roofs can be very fragile and must only be accessed with caution using the correct weight spreading crawler boards, harnessing etc. We are primarily coatings manufacturers NOT Health & Safety advisors and as such we do not offer definitive guidance on “working at height” or “working with asbestos”, so we recommend that you consult a competent person or Health & Safety professional before commencing works.
For further information, please refer to the relevant Material Safety Data Sheet.
Asbestos roof coating
Very good product just finished a 10mtr by 6mtr roof. Cleaned of and prepared with your sealer primer then 2 coat of the asbestos paint. Saved me a fortune of not having to reproof the building. Looks brand new now.
Reviewed by Richard Park