Patent ID: 6526723
Filing Date: 2003-03-04
Classification: E04C

Abstract:
A draft block joist system for preventing an airflow circulation therethrough, the system comprising:first and second elongated I-beams each having continuous upper and lower flange sections with a panel member disposed therebetween, each of the upper and lower flange sections having a flange length and a centrally extending contact-surface for engaging the respective panel member thereto along the flange length, the upper and lower flange sections of the first elongated I-beam being respectively connectable with the upper and lower flange sections of the second elongated I-beam along their respective flange lengths; an air gap formed between the panel members of the first and second elongated I-beams when the respective upper and lower flange sections are connected with each other along their respective flange lengths; and an insulation member removably insertable into the air gap and being retainable therein via frictional engagement for preventing the airflow circulation therethrough.