Houses built up until the late 1990s should be considered as possibly containing asbestos materials or products.
Asbestos roof tiles nz.
For now we recommend care whenever pressed metal roof tiles containing asbestos are or may be present in your workplaces.
Examples of asbestos in homes.
Review of the scientific evidence of non occupational risks.
Decramastic tiles are a scallop shaped metal tiles also known by other names such as pressed metal tiles decrabond and stone chip roofs.
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.
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.
Also see corrosion where new materials need to be matched with existing ones such as tiles or steel roofing see matching new to existing.
Asbestos in new zealand houses.
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.
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.
Some roofing and siding shingles are made of asbestos cement.
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 in early pressed metal stone coated roofing tiles prior to early 1980s.
Democrastic tile roofs were manufactured and widely used in new zealand during the 1970s and 1980s.
This will happen as soon as possible in 2017.
All mastic or bitumen based pressed metal roof tiles should be suspected of containing asbestos.
But other types of roof tiles containing asbestos also exist.
Chrysotile asbestos is the type usually present in asbestos containing materials in new zealand houses.
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.
Tiles which contain asbestos include mastic or bitumen based pressed metal roof tiles that were produced prior to the early 1980s.
Mastic or bitumen was the most common material used to adhere the stone chip to the pressed metal at that time.
