Shuttering - The Hempcrete Topic: Designing and Building with Hemp-lime - page 287

any damaged socket driver heads, as well as any screws where the head has become too
worn.
The shafts of heavy-duty screws are fairly thick and not particularly prone to bending, but
they will be used over and over again, and take a fair battering, so they do occasionally
bend. Because you are usually talking about a 200-250mm length, screws with a very light
bend might actually still be usable, at least for a time, but a more significant bend will
make the job really difficult. Screws should be checked for bends and head damage as they
are collected up at the end of the day, or as you go along, and the damaged ones discarded.
Fixing shuttering with screws and spacers.
The method of fixing is to start the screw so it emerges 20mm or so from the back of the
shuttering board, and then hold the spacer tube over the end of the screw, shoulder the
board towards the frame so that the spacer is holding them apart, and drive home the screw
until the flat on the head is flush with the face of the board. When enough of these are put
in (usually 8-10 per board, arranged in two rows) you will be surprised at how firmly the
board is held in place.