Shuttering - The Hempcrete Topic: Designing and Building with Hemp-lime - page 288

The standard temporary shuttering board measures 2400mm x 600mm (a standard 'eight
by four' OSB sheet ripped down the middle), and should be fixed as described in the meth-
od below right, with two fixings for every stud (three per stud if a full board is being fixed).
Wooden 'straps' or 'ties' are used to connect a board to adjoining boards. These need to
be around 150-200mm long, and are usually made from pieces of roofing batten. They
must be sufficiently stiff that, when four screws are fixed through them into the board (one
or two on each side of the join, as required to keep the boards true), they hold the two
boards in the same plane (assisted by the heavy-duty screws and spacers that are fixing
both boards back to the frame). It is important that these screws are long enough to go
through the whole thickness of the strap plus nearly the whole thickness of the board, but
not project through into the void. If the screw projects into the void, people cut their fin-
gers on the end of the screw while placing hempcrete, or at least snag their glove, causing
small holes through which lime enters to burn the hands.