Get Mold & Toxin News!

Subscribe to get the latest content by email and a free PDF on the top 10 signs of mold in your home.

Wishing everyone the opportunity to "Dwell Well!"

© Cheryl Ciecko, 2017

Cheryl Ciecko, AIA, ALA, LEED AP is a licensed architect who improves the health of people by helping them avoid toxin exposure in their buildings.  Cheryl also shares information on a variety of other potential toxin impacts affecting health, including food, products, water quality, and air quality.  Individual consulting is available upon request.


Follow Cheryl on LinkedIn, Twitter, and Facebook, or contact her by email at

More Questions?

Ask Cheryl yourself!

Do-It-Yourself Steps for Mold Investigation

December 6, 2016


Here’s the first 5 steps to take to evaluate your buildings for water damage and find mold.  Discovering water damage and mold, especially concealed sources, can require detective work and close attention to details.  Start with this list and compare your notes based on what you find to help focus additional investigation. 



1.  History of Water Damage - Flooding, pipe leaks, overflowing toilets and tubs, ice dam damage (icicles in winter), roof leaks, window leaks, condensation on surfaces etc. are just a few possibilities.  Note where and when these events happened.  Check these locations closely, but also know that water can travel great distances before it settles to cause damage. Lack of a properly sized and functioning exhaust fan in bathrooms, will mostly likely lead to moisture accumulation with potential mold problems.



2.  Indoor & Outdoor Visual inspection - Look for surfaces and locations with discoloration (even slight), texture changes, even slight shine or powder accumulation.  Any color changes should be photographed and monitored.  Pay close attention to ceilings below rooms with plumbing.   


Use a flashlight to look for even minor variations especially at common leak locations such as ceilings under plumbing, window and door openings, locations where roofs meet walls, balconies, downspout locations, gutters etc..


Check locations where any exhausts for bathrooms, kitchens or dry expel warm, moist air. Soffit venting of bathroom or other vents will cause mold in attics over time.  Check attics, crawl spaces and basements also for improper venting in these locations.



3.  Monitor Humidity Levels - Checking humidity readings is a good idea, as stored moisture in concealed spaces usually adds to the humidity levels in a room.  Meters cost around $10 at Walmart, Amazon etc.  Just give them time to acclimate and look for anomalies from room to room.  In heating seasons below 40% humidity is normal.  In humid summer months that number could be okay up to 55%.   Higher readings or rooms with higher readings than other rooms is a red flag for further investigation.  Check for a previous blog post on humidity monitors for more information on this topic.
















4.  Inspect in the Rain.  Review the building and property during a rain event.  Walk around the outside looking for gutter overflow, puddling along the foundation, indications of moisture saturation in walls, especially around openings which may show as darkened areas which appear to soak up water.  Many of these signs will go away shortly after the rain stops, so pay attention immediately.  Brick and stucco are very good as showing signs of water accumulations immediately after rain events.  Look for water pooling next to the foundation, gutters overflowing and not functioning properly, downspouts dumping on walls or foundations, window sills, door or windows, roofs draining into walls etc..




5.  Inspect and Clean HVAC systems.  Clogged condensate drains, dirty filters and coils, and even accumulation of debris in ducts can cause mold to flourish.  Up to 50% of mold in building challenges are directly related to poorly maintained, poorly functioning and sometimes faulty installations of Heating, Cooling and Ventilation systems.  (HVAC)  Check my prior blog posts for information on HVAC duct cleaning.


Check back to this blog for follow-up steps.


Know that very toxic mold can be completely concealed.  You may not smell it.  Some people exposed to toxic mold will feel fine others may get very sick. 

For a list of possible mold exposure symptoms CLICK HERE.  


Mold may be compromising your health or the health of people you care about without even knowing it.   Do not completely trust any screening test including ERMI, HERTSMI or air testing results if symptoms or bloodwork or history is consistent with mold illness.  I have had very good ERMI and air tests for me and for others in my family, and still found VERY toxic mold concealed.  In some cases, the water damage was exposed and the ERMI still came back unremarkable - (score under 2.0).

Please reload

Featured Posts


November 1, 2018

Please reload

Recent Posts

Please reload

Follow Cheryl
  • Facebook Classic
  • Twitter Classic
  • LinkedIn Social Icon
  • Pinterest Social Icon
Search By Tags