[Strawbale] Lime Plaster, The Magic Numbers

[Debbie Johnson-Jackson]

Hello,

We are ready to plaster the inside of our strawbale house and I have
looked through many books, blogs and list and watched videos and
while they gives great information on a lot of the steps involved in  
plastering,
there is one big areas that is left out. How do we go about  
determining how
much lime and other materials to order? I realize that the exact
amount depends on how the plaster is applied but is there a ball park
number for say the square feet at 3/4" of scratch coat one bag of lime
and it's corresponding sand (say 1 lime to 2 sand) will give? This  
information
is needed not only to order materials but to also determine how much  
plaster to
make if preparing the lime plaster the day before. We have about 5700
sq ft of wall to cover so this means quite a bit of material I am
guessing and guessing doesn't make it when ordering.
Any insight into how to calculate the amount needed would
be very helpful.

                 Thank You!
                         Debbie