Formaldehyde Like Odor Emissions from Floor Joists – Confirmed!

August 7, 2017

On July 18, 2017, Weyerhaeuser issued a press release indicating that “TJI Joists with Flak Jack Protection” manufactured after December 1, 2016 are releasing an odor related to a recent formulation change that included a formaldehyde-based resin ( According to the press release, basements of approximately 2200 homes in various stages of construction have these joists currently installed.

Prism Analytical Technologies, the laboratory bringing you Home Air Check, has analyzed a few indoor air quality samples from homes that have these joists installed and the results have indicated formaldehyde levels in the range of 300-900 ng/L. Most homes measured using Home Air Check Formaldehyde have concentrations in the range of 30-70 ng/L. Although there are no requirements set for formaldehyde concentration limits in homes, NIOSH recommended limits for occupational exposure are 20 ng/L (i.e., 16 ppb). The World Health Organization (WHO) has recommended that formaldehyde exposures not to exceed 100 ng/L (i.e., 80 ppb).

Common symptoms of formaldehyde exposure include irritation of the throat, nose, eyes, and skin, which also can exacerbate asthmatic symptoms and other respiratory illnesses. Home Air Check’s formaldehyde test is accredited by the American Industrial Hygiene Association (AIHA) and is a convenient do-it-yourself check of the indoor air in your home.

Want to know more? View our video “What is Formaldehyde?” below or visit our Formaldehyde Pollutants page.