The T Blocks are used for 90° angle wall connections when it's required for a perpendicular wall connection in a straight wall. T Blocks provide a structural T wall connection with both a short and long leg version for a strong reversible connection that eliminates the need for the contractor to manufacture them on the job-site. The foam panels are 1.5lb in density and 2.75" thick with reversible interlocking teeth that provide a super strong wall connection in what is often thought of as a weak and difficult area to set up and pour.