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Part L1A Building Regulations 2000 - Conservation of Fuel and Power
Download the Part L1A Building Regulations in PDF Format (Right click and select Save As)
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Building Regulations Website - Further information on Building Regulations
 

The New Part L Air Tightness Test

 
» Air tightness test's are required under the revised Part L building regulations, which came into effect on April 6th 2006.
   
» Testing involves a pressure test, carried out in accordance with ATTMA TS1. To pass, buildings must achieve a minimum rating of 10m3/h-1 per m2 of building envelope, at 50 Pascals (or a level specified to achieve an acceptable SAP rating).
   
» Good workmanship of all involved in the process of consruction should ensure a pass for the vast majority of properties.
   
» For multiple dwellings it is recommended in Part L that tests are carried out on early completions in order to prevent errors in later projects.