Envelope Leakage

LBNL analyzed the air leakage measurements from 134,000 single-family detached homes in the US. This calculator computes the expected air leakage distribution for homes with selected characteristics. The predictions are based on results from the multivariate regression.

Floor Area (sqft)

Ceiling Height (ft)
(calculation assumes house height = ceiling height + 2 ft)

Year Built

Weatherization Assistance Program (WAP) qualified?

Home rated for energy efficiency
(e.g. ENERGY STAR certified home)?

Climate zone
See IECC climate zone map; also residential energy code requirements

Foundation Type

Duct System Location

Residential Building Systems Group, Environmental Energy Technologies Division , Lawrence Berkeley National Laboratory ,