Shuttering - The Hempcrete Topic: Designing and Building with Hemp-lime - page 294

slightly longer screws than normal (depending on the frame detail). Don't use spacers
for these screws; just sink them into the frame wherever you can get a secure fix, and
wind them in and out to adjust the position of the corner until you are happy with it.
When fixed, measure all distances from the boards back into the frame, to check that
the desired dimensions of cast hempcrete will be achieved. Double-check that the two
boards meet at a 90-degree angle, using a set square on both sides of the boards, and
check them for plumb with a level. Adjust as necessary.
Fixing shuttering for an internal corner.
Corners internally (Method 2):
As an alternative to the above, a square-section timber can be screwed tight into the in-
side of the corner, with the screws sunk right through the timber from its exposed
faces, to project slightly from the other side and catch the board (see Figure 10 ).
Check that the timber used is completely straight and square, and double-check after-
wards that the corner is where you want it to be.
If using this method, don't do what one of our volunteers did and sink screws through
the back of the board into the timber (see Figure 10 ). Once the hempcrete has been cast
you cannot get at the head of the screw to remove it, and cutting the screws to get the
shuttering apart without damaging the freshly cast hempcrete is a heart-stopping and
time-consuming business.