5.5  Unacceptable Materials and Processes

The materials and processes given below must not be used:

a)  High Alumina cement or concrete;

b)  Woodwool slabs as permanent formwork or in structural elements;

c)  Concrete or mortar additives containing calcium chloride;

d)  Aggregates for use in reinforced concrete which do not comply with British Standard Specification 822.1992 and aggregates for use in concrete which do not comply with the provision of British Standards 8110:1985;

e)  Calcium silicate bricks or tiles;

f)  Any products or materials containing urea formaldahyde foam or materials which may release formaldahyde in quantities which may be hazardous with reference to the limits set from time to time by the Health and Safety Executive;

g)  Asbestos or asbestos containing products whatsoever;

h)  Lead or any materials containing lead which may be ingested, inhaled or absorbed except where copper alloy fittings containing leading or specifically required in drinking water pipework by any relevant statutory requirements;

i)  Slipbricks;

j)  Lightweight or air entrained concrete bricks or blocks;

k)  Vermiculate plaster;

l)  Polysicoyanurate foam;

m)  Extruded polystyrene other than low ozone depletion materials;

n)  Materials which are generally composed of mineral fibres either man made or naturally occurring which have a diameter of 3 microns or less and a length of 200 microns or less which contain any fibres not sealed or otherwise stabilized to ensure that fibre migration is prevented;

o)  Bitumen coated polythene save that the use of bitumen coated polythene may be permitted for tanking and DPM but express permission must be sought from the Beneficiary;

p)  Concrete open web lattice joists or beams (nailable type);

q)  Timber trussed rafters manufactured with truss plate connections. Bolted trusses are permitted;

r)  All tropical rain forest hardwoods;

s)  Any product which contains or uses Montreal listed CFC gases in its manufacture;

t)  PTFE fabrics - the only permitted use of PTFE is as a jointing tape in plumbing applications and on specialist applications such as valve seats;

u)  Pre-cast concrete floors at ground floor level or ribbed floors;

v)  Resin coated blocks;

w)  Spectra glass or similar pre-finished blocks;

x)  Wall and ceiling lining products and composite cladding products that are either not non-combustible or do not meet the Loss Prevention Standard LPS1181 or which do not meet the Factory Mutual Standard FM4880;

y)  Other substances or materials generally known to be deleterious at the time of use; and

z)  Other substances or materials not in accordance with British Standard or codes of practice where such exist.