Air leakage at service penetrations in ceilings. Luftlekkasjer ved gjennomforinger i tak.

Work has been in progress for several years on the revision of Byggeforeskrifter (Norwegian Building Regulations), and the new chapter 54 sets quantitative requirements for the air tightness of sections of a building and the building as a whole. In this project, good and bad solutions are illustrated and an effort is made to show the importance of good workmanship. The commonest types of leakage were identified by examination of Leca pipes.The conclusion drawn from the investigations was that Leca pipes should be surface treated to prevent large air leakages. Describes choice of sealing methods. (An AIVC translation of the report summary is available.)