Retrotec Residential Pressure & Air Leakage - Manual (Page 22)

Page 22 of 75
©Retrotec Inc. 2014
Figure 9: Common leak locations in a house.
Where to look for leaks
With the Blower Door running, take a walk around the house. There are a few common leakage sites.

Ductwork

Floor spaces (especially floors over unconditioned spaces, like garages)

Recessed lights

Attic accesses

Chimneys

Wall penetrations

Sliding doors

Rim joists (along foundations, plumbing penetrations)

Soffits, false ceilings

Exhaust fans
3.4.1. Locating Leaks without Tools just using your senses
The simplest and quickest method to locate air leaks is to walk around looking for leaks without any tools at all.
If the door to a leaky room is nearly closed, a strong flow of air can be felt flowing through the small opening.
Running a hand along a leaky window sill, or beneath leaky pot lights, will quickly determine if those are sites of
leaks as well.
3.4.2. Locating Leaks with Chemical Smoke that moves with air currents
Chemical smoke is often a neutral buoyancy smoke, that doesn’t move unless air is flowing in one direction.
Release small puffs of smoke near potential leakage sites, and observe the smoke movement.
3.4.3. Locating Leaks with Theatrical Smoke that oozes out the cracks
Theatrical smoke can provide quite a show. It is recommended that theatrical smoke only be used in a
pressurization test, since that will force the smoke outdoors, and not draw it into the house.
3.4.4. Locating Leaks with Infrared Camera to see different temperatures at leak
locations
An infrared camera can be used to detect warm and cold locations, which can indicate leakage. Some training is
required to operate an infrared camera properly.
3.5 Perform a Single Point Test for a Standard or Protocol
Some protocols require completion of a single-point test in order to be in compliance with the standard. In this
case, the test procedure can be based on recording the result observed on a digital gauge.
1. Record all relevant test and building information before beginning the test (i.e. building dimensions,
time, temperature, equipment information). A sample test form can be found in Appendix B.
2. Set up the fan to take bias pressures. This will normally be with the fan cover on, with the L4 Flow
Range set-up, however follow the procedure set out by the standard for which the test is being run.
3. To collect bias pressure readings, set the gauge for 10s time averaging and put the gauge down on a
table, fan case, floor, or somewhere convenient.