Vermiculite Applications
Roof Screeds
|
|
Vermiculite concrete can be laid over a wide
range of sub-bases to provide an insulated and resilient roof. It may be
used to advantage where fire resistance is important.
Suitable for concrete flat slab and low
pitched roofs, and those constructed of hollow tile or precast concrete
beams. Vermiculite concrete is of particular value for renovation of old
roofs to improve falls and prevent ponding. All slabs should be
protected by a suitable topping and finished to falls for built-up felt
or asphalt roofing.
Ventilation
Moisture entrapped in a roof is always a
potential source of troubles, such as blistering, ceiling stains or
mould. Appropriate ventilation should therefore always be provided to
allow free water or moisture vapour to escape.
Recomended
Thickness
Since the thermal insulation requirement of
roof screeds varies considerably with its form of construction, it is
only possible to give a general recommendation of minimum thickness of
100mm for new roofs, however each design should be calculated by using
the Thermal conductivity for your chosen concrete. For renovation to
existing roofs a minimum thickness of 20mm Vermiculite concrete should
be used wherever possible, together with a suitable bonding material.
Topping
A sand/cement topping of 10 - 20mm should be
provided to protect the Vermiculite concrete. This should be laid
monolithically.
Relevant Products: