Mixing hempcrete - The Hempcrete Topic: Designing and Building with Hemp-lime - page 328

Do whatever it takes to prevent excess water entering the mix.
If it rains into the mixer, of course, you run the risk of adding excess water to the mix. If
it is not possible to keep the rain off (and it's not always easy to find a covered and well-
ventilated space for such a large mixer) then in heavy rain, either stop mixing or reduce
the amount of water you are adding to the mix to compensate, checking the consistency as
you go along and adjusting it as necessary (see page 200 ) . Always aim to add the minimum
amount of water needed to achieve the correct consistency.
On a large build, it may be appropriate to change the site of the mixer as the work moves
around the building, although in practice this can be complicated as it involves balancing
all of the factors described, as well as finding a place that is not disrupting the work of
other trades. Obviously if you have the mixer on a stand rather than on a trailer, you need
a forklift or telehandler to move it around the site, instead of just towing it.