Airtightness and wall construction in prefabricated Swedish single family houses, 1984.

This survey describes how external walls and joints are constructed in practice. The paper gives you an opportunity to compare how successful the implementation of airtightness has been in Sweden in comparison with the results presented in the report D2:1983 "Air infiltration control ..." by A Elmroth and P Levin. The survey covers the majority of all Swedish prefabricated single family houses constructed in 1984. All big prefabrication companies are included in the survey. The following issues are presented: - Wall sections - Sealing systems - Measured airtightness and method - Number of houses measured - Distribution between different heating and ventilation systems - The demand from the customers to measure the value of airtightness The conclusions are that: - the majority of the houses has an airtightness of 2-2,7 ach/h - the airtightness is easy to decrease to less than 1,0 ach/h - it is recommended to control 5-10 % of the production of each housetype - airtightness is easy to control with the exhaust fan - only the big customers carry out control