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Percolation Tests questions, answered by experts

Knob and tube wiring is an older type of electrical wiring that's no longer used and generally not considered safe. However, some homes still have it, or may have a knob and tube wiring system that was incorrectly modified or rigged to work with a modern electrical system. Knob and tube wiring may contain asbestos insulation, but the only way to know is to have the material professionally tested.

A professional indoor air quality inspection takes anywhere from one to three hours, depending on the size of your home and the number of necessary samples. After the test, the specialist will discuss the findings, but you won’t get a full written report for 2 to 10 days, though you can ask your pro to expedite the process, if needed. 

Professional testing is advisable to ensure safety regulations are met, and accurate results are obtained using certified methods.

Regulations require certified professionals for removals and disposal in compliance with local and federal guidelines, ensuring safety and legality.

Through air sampling devices and surface swabs in key areas of concern.

The Bellevue, WA homeowners’ guide to percolation testing services

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