Dan :
Portland cement based Concrete will not stand up to the temperatures of a
Rocket Mass Heater !
PLEASE ! Consider going to
Rocketstoves.com to Download your PDF copy of the 3rd Edition of
Rocket Mass Heaters.
With over 100,000 RMHs build world wide, this is 'The Book' around which the majority have been made. Over95% of all
the 1st time builds (that worked) were made following 'The Book '!
This book contains the information in easy to follow print and illustrations giving you the exact knowledge to come here
knowing that you will be using the same language to describe the Size(s), Shape(s), and Orientation of the RMHs parts,
both to the whole rocket And each other!
It will also save you time money and frustration in the making of your 1st rocket ! Get "The Book'' and continue to follow
these pages ! If there is a rocket in your future your Fellow members will help you build it ! for the Craft! Big AL