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Last edited 12 Oct 2020
Fibre cement is a composite building material first developed in the early-1980s as an asbestos-free cement-based construction product. It is used predominantly in roofing and façade products because of its strength and durability.
Fibre cement products are a mixture of:
- Natural and synthetic fibres.
- Portland Cement.
- Small amounts of chemical additives to provide particular characteristics.
Some of the advantages of fibre cement include:
- Resistance to rust, rot and chemical attack.
- Vapour permeability, which reduces the risk of condensation.
- Excellent thermal and noise insulation properties.
- Good weather-proofing properties.
Fibre cement corrugated sheets can be used for a wide range of situations, but are most common in:
Marley Eternit, the UK’s largest manufacturer of fibre cement products, produces AS6 and AS3 profile sheets, differentiated by the size of the corrugation in the sheets. The AS3 profile has smaller corrugations than the AS6 profile. AS6 is designed for roofs with a pitch of 5-degrees, and for vertical cladding in both single skin and insulated constructions. AS3 is more suitable for small structures such as housing, general purpose sheds, and garages.
- The smooth surface should face upwards.
- Sheets should be cut using a hand saw or slow speed power saw.
- Fixing holes should be drilled not punched.
- Factors influencing the roof fixing, such as the purlin or rail type and the nature of the roof in question, should be carefully considered.
A fibre cement slate is a lightweight roof tile, particularly suited to complex roof geometries, which can also be used for vertical hanging. The surface and square edge are designed to closely resemble natural slate, and have the advantage of being easier and faster to install. In addition, they can be installed on roof pitches as low as 15°.
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