Abstract: Molded composite polymer construction blocks are made that are easily assembled, using alinement pins and apertures, with channels for insertion of sealant and vertical passageways for pipes, wires, etc. Stud supporting cavities in one side of the block extend into the ribs or end walls. The cavities can be provided with a protective metal insert. Studs or wooden blocks can be inserted into the cavities. The wooden studs or wooden blocks of various lengths provide spacing for insulation and/or drywall installation.