Lake Tapps homes often need blower door testing for energy-code finals and for finding why lakeside rooms feel drafty in winter. We run residential air-leakage tests with Retrotec gear and can add FLIR thermal imaging when you want to see where the air is moving. From Sumner Ste 117 most Lake Tapps addresses are inside the free 20-mile travel radius; farther jobs are $1.75/mi.
Ensure your home or business is energy-efficient and comfortable with our professional blower door testing services.
Providing third party blower door testing results for Washington State Energy Code (R402.4.1.2) air leakage testing compliance.


Trained on Retrotec equipment.

Precise and thorough testing.

Retrotec Equipment for accurate results.
Trust our trained staff to conduct thorough Blower Door tests to assess your building's air tightness and identify potential energy leaks.
Ensure your project meets energy code regulations with our approved third-party WA Energy Code testing services.
We can use our blower door and FLIR thermal camera to identify where leaks are coming through your building envelope.
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Our family: Dow Engineering, Build Sherpas. Same office in Sumner.
WA Blower Door, a tradename of Dow Engineering PLLC · 16202 64th St E Ste 117, Sumner, WA 98390 · (253) 802-8738
Dow Engineering PLLC