Mold Wise
These are the tools we recommend for finding moisture and hidden mold in your home.
Humidistat
Mold thrives in humid air, so knowing your home's humidity is the first step. Health Canada recommends keeping indoor humidity between 30% and 50%.
- The numbers: under 50% is ideal. Over 60%, it's time to act.
- Place two: one in the basement and one on your main floor or in a bedroom.
- Consistently high? Run a dehumidifier and your bathroom and kitchen fans.
Pinless Moisture Meter
Glide it flat across drywall, flooring, tile, and wood to scan for moisture hiding beneath the surface, without leaving any holes.
- Compare, don't just read: test a spot you know is dry, then the area you're worried about.
- Concrete caution: concrete holds moisture and is often cold, so readings aren't always accurate. Treat them as a clue, not a verdict.
Pinned Moisture Meter for Wood
Push its two small pins into wood to measure the actual moisture content. Unlike the pinless meter, you can't glide it across a surface. You test one spot at a time.
- The magic number: wood that stays below about 20% moisture generally won't support mold.
- Use it on: subfloors, framing, baseboards, window sills, and under-sink cabinets.
Borescope
A small camera on a flexible cable that lets you see into places you can't. It's great if you can drill a small hole in a wall to look behind it, or to check your HVAC system.
- Drill smart: check for wires and pipes first, and wear a mask if you suspect mold.
- Patch it up: seal the hole when you're done.
Thermal Camera
Shows temperature differences across walls, ceilings, and floors. Damp areas often show up as cooler patches.
- It can't see mold (or water directly), so always confirm with a moisture meter.
- Great for: leaks, condensation, and cold spots around windows and exterior walls.