Hello,

We have a 1961 home in Hawaii and it has a low slope (2:12) roof with ~ 2″ of canec on top of an open beam ceiling.

Canec is the common name for a fiberboard building material that was made from sugar cane bagasse — fact sheet attached.

Question — What is the R-Value of the canec?

We plan to remove all Canec and reroof.  We want to ensure our roofer’s proposed plan at least meets this R-Value.

Thank you,
Andrew