Insulated concrete form construction is easy using Earth Friendly Block(tm). EF Blocks are 10" x 12" x 60" (5 feet long). Each time you place one standard block you cover 5 sq. ft. of wall surface. Blocks are lightweight (approximately 45-48 lbs. each), dry-stacked, spot glued, rebar is inserted and walls are grouted solid with concrete. What you end up with is solid concrete house walls that are equal to an R-40 insulation. They are fire, and sound resistant, and bugs and termites dont eat or nest into the block walls. If you would like more information about EF Block please visit our website www.efbm.com or contact us direct at (480) 830-5393. We are located in Tempe, Arizona