Page 28 - Haddonstone

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6.1 Protecting During Construction

Protect the units at the end of each day with polythene sheeting to prevent contamination
and use edge protectors to prevent impact damage to the arrises. Allow an air space to let
air circulate within the polythene sheeting, to prevent condensation forming.

6.2 Laying

Cast stone should only be installed the surface of the mortar stain. The acid
by masons or suitably experienced should then be washed from the surface
personnel. Below are some general of the masonry. Care should be taken
precautions that should be observed. to ensure that the acid washings are
collected and conveyed to a safe place
• During construction it is advisable to for disposal. Protective equipment will
protect finished work using appropriate be required by the operatives and this
gauge polythene sheeting. This prevents will include goggles, rubber gloves and
mortar drops, mastic, paint and other protective overalls.
construction materials staining or
adhering to the cast stone. • Brace constructions to prevent damage
to freshly assembled materials. It is also
• Mortar stains can be removed by using advisable to limit the height and number
a dilute hydrochloric acid (typically of courses constructed in any one day,
7-10%) solution. The masonry should depending upon the width of the wall,
be wetted down with water to reduce the mortar strength, exposure, unit density
initial suction by the cast stone. Under and weight. Typically, individual lifts
no circumstances should the masonry should be limited to 1.2m in any one day
be saturated. The stain should be unless restrained.
agitated with a nylon brush to break up