Asbestos Cement (Fibro Sheeting)
Your Fibro roof does not need to be replaced
For a fraction of the cost of a roof replacement, Restyle can encapsulate your fibro roof to make it safe and modernize the look. We can also save you more money by using Coolit Ceram liquid thermal insulation coatings which can cut the temperature inside the house by 8 to 12 degrees.
The asbestos in Fibro roof sheeting is only dangerous when it is disturbed or breaks off releasing fibers. The Restyle process will bind the fibers together so that in normal conditions the fibers will not separate.
To learn how we can make your Fibro roof safe follow the link.
Why do Asbestos Cement roofs erode and become brittle?
Normal free atmospheric carbon dioxide reacts with accessible cement compounds in the roofing in a process known as carbonation. This carbonation causes reduced resistance to shock, brittleness and weathering (erosion) of the roofing. The extent of carbonation in concrete (and fibro) can be seen in the erosion of the surface. Carbonation is a result of maintenance neglect. The Restyle coatings will arrest this carbonation. View our Case History (PDF) on hail damage.
Hail Damage To Paint On Fibro And Other Roofing Case History
The fear of asbestos aside, asbestos cement roofing is an otherwise excellent roofing material. However, when asbestos cement sheeting weathers it slowly becomes harder and more brittle. The outer surface becomes friable and asbestos fibres are no longer encapsulated in the cement matrix. Most coatings presently being applied use an inadequate water based primer. Such water based primers are only adequate for use when the surface has been thoroughly water blasted clean. This process is illegal for a fibro roof. Water based coatings have great difficulty in wetting out the asbestos layer as it resists the penetration of the resinous binders in the water. The water penetrates leaving the resin or body of the primer behind. Other systems utilise a chemical cleaning followed by an acrylic primer. Extensive research by one major Australian paint laboratory has found that the preferable alternative to thorough cleaning involves the use of a two pack epoxy sealer. This soaks into the loose friable asbestos rich surface penetrating down to the cement rich core.
A case history from the June 2005 Brisbane Hail Storm demonstrated the ability of the Restyle Epoxy system to withstand hail damage and prevent the associated contamination of the surrounding area
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Epoxy Encapsulation works
The three part two pack epoxy sealer soaks into the loose friable asbestos rich surface penetrating down to the sound cement rich core. Epoxy sealer has unequalled penetration and bonding qualities making encapsulation permanent (water based coatings have great difficulty in wetting out the asbestos layer as asbestos resists the penetration of water and water based products).
After this coat, the loose friable particles are embedded in a tough, cured layer of epoxy resin. The epoxy actually strengthens ageing asbestos cement roofing.
The CSIRO Division of Building Construction and Engineering has recommended that unless an encapsulating system for weathered AC sheeting develops over 15kg/cm2 adhesion then it cannot be considered a suitable treatment for such roofs. The RESTYLE sealer and bonded resin develops over 40kg/cm2 of adhesion.
RESTYLE topcoats are a high build and flexible layer. They provide UV protection, which is recoatable, can be repaired or patched without complete recoat, have proven durable life span excellent adhesion to the stabilised surface. They are also available in COOLITCERAM liquid thermal insulation coatings.
To learn more about the encapsulation process follow the link.