News Analysis

Rastra Update: Legal Status and R-values

Rastra officials have backed away from previous claims that the wall system achieved an R-36 thermal performance.

As described in our July 1996 product review (EBN Vol. 5, No. 4), the introduction of Rastra to the U.S. has been fraught with conflict and confusion. With one of the two battling companies now out of the picture, the situation appears to be settling down for this foam-and-cement, stay-in-place concrete form product.

Here’s a bit of the history, and the current status:

Published September 1, 1999

(1999, September 1). Rastra Update: Legal Status and R-values. Retrieved from