This standard specifies the laboratory method for determining the air permeability of joints in buildings when subjected to positive or negative air pressure. It details the apparatus, test specimen preparation, procedure, and calculation method to quantify air leakage. The results are used to evaluate the performance of components like window seals, door frames, and facade panel joints against air infiltration.
Method of test for laboratory determination of air permeability of joints in buildings
Quick Reference Values
Standard length of test specimen1 m
Recommended maximum test pressure600 Pa
Accuracy of pressure measuring device±2% of the reading
Accuracy of airflow measuring device±5% of the reading
Stabilization period at each pressure stepNot less than 10 s
Key Formulas
q_L = Q / L — Air permeability per unit length of joint (m³/h·m), where Q is the rate of air flow (m³/h) and L is the length of the joint (m)
Practical Notes
This test is crucial for validating the performance of facade joints against air leakage criteria specified in energy codes like ECBC.
Results are highly dependent on the quality of specimen installation in the test rig; care must be taken to replicate site conditions accurately.
The standard is for lab testing only and should not be confused with on-site whole-building airtightness tests (e.g., Blower Door Test).