Shuttering - The Hempcrete Topic: Designing and Building with Hemp-lime - page 306

Permanent shuttering using magnesium silicate board,
viewed from outside the building.
The fixing of permanent shuttering boards is exactly the same as for temporary shuttering
to exposed frames (see page 181 ) . Follow the manufacturer's guidelines as to the number
and type of fixings, but remember that all fixings should be alkali-resistant (stainless steel
or plastic), as they need to resist corrosion by the lime in the hempcrete and the lime plaster
that will be applied over the top of the board. In the case of wood wool boards, a plastic
disc washer of 60mm diameter is fitted to the screw, so that the screw holds the board ef-
fectively and does not pull through the face of the board. These discs are designed to be
plastered over in the basecoat.
The usual reason for permanent shuttering is to save on labour costs: the exposed frame
design means that spacers are not needed to fix the shuttering on that side of the wall, and