Some roofing and siding shingles are made of asbestos cement.
Asbestos roof tiles nz.
Chrysotile asbestos is the type usually present in asbestos containing materials in new zealand houses.
Also see corrosion where new materials need to be matched with existing ones such as tiles or steel roofing see matching new to existing.
Ahi roofing limited intends to work with the roofing association of new zealand and to help installers and removalists deal with these issues in practice.
All mastic or bitumen based pressed metal roof tiles should be suspected of containing asbestos.
This will happen as soon as possible in 2017.
The fibres of health significance are those that can be inhaled.
Chrysotile fibres tend to break across the fibre so become shorter and remain thicker than the crocidolite and amosite fibres.
Examples of asbestos in homes.
Mastic or bitumen was the most common material used to adhere the stone chip to the pressed metal at that time.
Asbestos in early pressed metal stone coated roofing tiles prior to early 1980s.
Asbestos is found in some vinyl floor tiles and linoleum and as backing on vinyl sheet flooring and adhesives.
Asbestos in new zealand houses.
Review of the scientific evidence of non occupational risks.
Asbestos exposure in new zealand.
Houses built up until the late 1990s should be considered as possibly containing asbestos materials or products.
Decramastic tiles are a scallop shaped metal tiles also known by other names such as pressed metal tiles decrabond and stone chip roofs.
In new zealand most houses built before 1975 have a high probability of containing asbestos building products and materials as well as asbestos insulation products in their construction.
That s not surprising as asbestos has so far been identified in around 3800 different building products used in new zealand homes and commercial buildings from lino flooring to roofing tiles to.
But other types of roof tiles containing asbestos also exist.
You will find that existing asbestos roofs have probably been in place for many years and in the case of the new zealand naval dockyards the material had weathered and protected their facilities for close on 65 years right on the coast in the most severe environment with no corrosion or breakdown of the substrate.
Some versions of mastic or bitumen based pressed metal roof tiles produced prior to the early 1980s contain asbestos.
Asbestos cement materials will typically last about 50 60 years any asbestos cement roofing that shows evidence of damage such as broken roofing or noticeable surface weathering may need to be replaced.
For now we recommend care whenever pressed metal roof tiles containing asbestos are or may be present in your workplaces.
