Causes of mold in Air Ducts

Causes of mold in Exterior

Causes of mold in Bathroom

Causes of mold in Kitchen

Bare earth floor with porous soil near foundation

Missing or damaged Vapor Barrier

Ground water due to high water tables

Rain and Flood water

Cracks in Foundation and Foundation Walls

Plumbing related problems

Faulty or missing Air Duct Insulation Materials

Poor Ventilation or Lack of it

Outdoor air getting into crawl space from outside

Water Evaporation leading to condensation

Exposed Plumbing Pipes and Joists

Causes of mold in Crawl Space

What Causes Mold Around the House

IN A NUTSHELL, MOLD NEEDS THESE TO GROW

Causes of mold in Attic

Causes of mold in Basement

Minor and Major Roof Leaks

Faulty or Missing Insulation

Ice and Snow Damming Problems

Improperly exhausted Dryer, Bathroom and Kitchen vents

Heaters and Furnaces in the attic

Condensation Effect during cold season

Improper Ventilation or lack of it

Water Leaks from Sink and Dishwasher

Plumbing Problems (Leaks & Overflows)

Water spills / Running tap water

Condensation on plumbing pipes

Steam from boiling water / cooking

Steam from Dishwasher

Plenty of food molds loves to grow on

Poor Ventilation / Air Circulation

Leaking plumbing pipes

Flooding (nature or plumbing caused)

Broken, clogged or sagged gutters or downspouts

Clogged/Faulty footer drains

Sump Pump failures

Sloping grounds/ ground waters

Cracks in Foundation and Foundation Walls

Rain and Melting Snow from windows

Water Condensation on cold surfaces

Lots of materials mold loves to grow on

Dust and dirt accumulated with time

Poor Air Ventilation / Circulation

Plumbing Problems (Leaks & Overflows)

Water Condensation on walls & ceiling

Water Evaporation

Frequently running watter

Wet surfaces after showering

Wet surfaces from Hot Steam

Water Puddles on the floor and around sink

Broken toilet and bathtub seals

Poor Ventilation / Air Circulation

Failed grout and/or caulking between tiles

Dust, dirt, debris and pet hair collected in the vent

Clogged air duct filters

Using basic fiberglass filters in houses withpets and other sources of micro-particles

Leaks around duct joints

Wetted fiberglass-lined ductwork surfaces

Damaged or missing air duct insulation

Damaged or missing foil vapor barrier

Condensation on metal parts of HVAC units

Improper use or absence of Drain Pans

Improper mixing of outside and inside air

Saturated air coming from air conditioner evaporator

Weak (slow) air flow coming out of the grill

Nearly constant presence of moisture

Rain water running down the wall surface

Downspouts emptying next to the wall

Siding made of porous materials such as wood, stucco, etc

Vines and shrubs growing along the side of your house

Broken, clogged or sagged gutters or downspouts

Leaks and condensation from air conditioner drain lines

Incorrectly placed sprinklers system

Water wicking into the foundation from the sloping ground

Poor ventilation in tight areas along the walls

Abundance of organic materials mold loves to grow on

Knowing what causes mold to grow indoors can help you spot mold problem well before it gets out of hand, as well as effectively prevent mold contamination from happening in the first place.

Mold spreads around by releasing microscopic airborne spores which at some point can end up inside of your house. Once the spore lands on wet surface and certain conditions are met, it will start growing.

So what exactly causes mold around the house?

In every major area of the house there are plenty of possibilities for mold spores to flourish. Anything, from a plumbing problem to a lack of proper ventilation could lead to creating optimal conditions for mold to start growing indoors.

To learn more about what causes mold to grow in particular areas of your house, check out our detailed illustrations below.

Mold Spores A food source Moisture

Oxygen Lack of SunlightOptimal Temperature

Invisible to the naked eye, mold spores usually get inside

your house from outdoor.

Abundance of organic materialsmakes indoors a perfect breeding

grounds for mold.

Prolonged exposure to wet conditions is required in order

for mold to start to grow.

A steady supply of oxygen plays a vital part in mold growth

and reproduction cycle.

Direct exposure to sunlight is deadly to mold, that’s why it

prefers to grow in the dark.

Direct exposure to sunlight isdeadly to mold, that’s why itprefers to grow in the dark.

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