Mayday Property Inspections Ltd.

07/31/2026

12/23/2025

Impressive results. 0.6 ACH60.
This was part of an ongoing occupant, comfort/odor consult. To find out the house was at this level of air tightness was a little surprising as the homeowner did not work with the builder to build to this level of air tightness. The builder obviously put some care and attention into this house as many builders who actively try to reach us level of their tightness struggle.

The second image shows in the HRV instructions where it says balancing is required. Many technicians are under the impression. The HRV is balanced from the factory, and therefore are not required. It is clearly laid out in the installation guidelines. now when you have a house that has this level of air tightness. A HRV imbalance can greatly affect the home and occupant comfort.
Further testing also found that the kitchen range exhaust was able to depressurize the house to -40pa.

11/27/2025

Large building air tightness testing completed. 110 unit apartment plus commercial space.
Testing large buildings are never the same each building has its own complexity . This building had some design features that introduced some complexity. A lot!!! of walking and stairs were done on this test day. 🏃🏃🏃🏃🏃

11/11/2025

Part of envelope testing is calibrating the equipment. The testing standards used all call out for a specific calibration timeline. Here we are testing the spray rack we commonly use for ASTM 1105 water pe*******on of windows and doors as well as several other testing standards.
Calibration check needs to be done every six months

10/05/2025

Some late night air tightness testing. This building is in the final push to get open for clients therefore to satisfy the needs of the many other trades working we complete this during the night.

Results were great 0.42ach50. This building is passive haus and therefore with the calculations they use the volume above ceiling tiles do not count. Is we were to calculate actual building envelope volume would be below 0.2ach50

09/17/2025

8 air changes per hour. We don’t typically see single family homes this “leaky” here. Multifamily - absolutely unfortunately. 5600 cfm of air.
This home 1965 and had some major building envelope leakage, outside of large building testing it is rare for me to have to run the blower door on open range.
Point of today was to give the client a baseline and information on where to look to make improvement.

Now what was really amazing that all 3 of the fireplace dampers were doing a great job sealing.