Ratios for mixing hempcrete in a large forced action pan-mixer, or spray machine (bags of binder to bales of hemp shiv to water volume) are given in the individual product pages. If you are mixing on a smaller scale, for example in a cement mixer (Belle mixer), you can use “this rule of thumb” ratio to measure mix quantities out by volume (e.g. in buckets). This mix ratio works for all hempcrete binders, with small adjustments to the amount of hemp if your mix is slightly too dry, or slightly too wet.
Small batch hempcrete “by volume” mix: 3-3.5 hemp shiv : 1 binder : 1 water
If you’re mixing in a Belle mixer, please watch this video.