Use of thermal blocks on a metal building in conjunction with an insulation system can meet or exceed US energy codes. Thermal blocks are comprised of a rigid foam that is specifically designed to provide a continuous insulation system when paired with fiberglass metal building insulation. If installed properly, thermal blocks stop condensation at the top of the purlin cavity . This compliments the fiberglass insulation, allowing it to perform as designed as well reduces the overall purlin cavity moisture. They also provide a barrier between the outer shell of the building and interior structrual framing. Thermal Blocks can be used in conjuction with a single layer insulation system or with a double layer insulation system.