RASTRA

I have been recently doing some research into alternative building materials. My reason is to find a fast system that I can assemble myself on weekends and evenings. There are three systems I have found: RASTRA, Hebel Blocks and Bluemaxx.

Hebel Blocks are expanded ( air ) concrete elements that are heat ( fast ) cured which I suspect may reduce their inherent strength. They are light weight but smaller than either of the other system elements. Bugs wont attack cement though.

RASTRA elements incorporate cement to provide the bonding agent for the recycled EPS aggregate. Requires rebar for the concrete pumped into the interior voids to provide strength. Bugs won't attack it because of the cement ( caustic ) environment. Same for mildew and fungus. Ten foot standard element length and light weight fits my "do-it-myself" requirement.

Bluemaxx offers more manufactured elements than RASTRA, but I don't see that as a major concern. Their elements are of similar size again fitting my "do-it-myself" requirement. The Bluemaxx system is two solid EPS panels separated by ABS plastic grids that extend through to the outer surface of the two EPS panels to provide nailer strips. These grids also serve to provide rebar clips in the interior voids. My big problem with this system is the solid EPS panels. I have a friend with a log cabin and the wasps are carrying away the foam chinking! These might be good for interior walls.

Offered by Steve.