Question 1

Does poor grading around a Calgary house cause basement mold?

Accepted Answer

Yes, poor grading around a house is one condition that can contribute to basement mould. Ground that slopes toward the foundation can put water against the wall, and moisture is what mould needs.

How Grading Connects to Mould

Water that enters through the foundation wall or floor can saturate drywall, insulation, carpet and wood framing. The Alberta OHS bulletin notes that mould can begin growing within 24 to 48 hours on a damp surface, so even a slow, recurring seep after rain or snowmelt ca

Question 2

Bathroom fan not vented outside in my Calgary house, mold risk?

Accepted Answer

Bathroom Fan Venting and Mould Risk

A bathroom fan that exhausts into the attic, a wall cavity or a soffit instead of outside is one of the conditions that can allow mould to begin growing within 24 to 48 hours on a damp surface, according to an Alberta OHS bulletin. The warm, humid air condenses on cooler surfaces, and if it has been doing so for months or years, you may already have mould in the attic or cavity even if you cannot see it yet.

The first step is to find where the duct actually

Question 3

Window sills grow mold every Calgary winter, how to stop it?

Accepted Answer

Window sill mould in a Calgary winter is usually a condensation problem. Warm indoor air meets the cold glass and frame, water forms, and mould can begin growing on that damp surface within 24 to 48 hours, according to an Alberta OHS bulletin.

Why It Keeps Coming Back

Possible reasons to check are indoor humidity above the range Health Canada recommends, air that cannot reach the glass, or a window that runs cold. Cleaning the mould without dealing with the moisture means it can return.

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Question 4

Found mold on the back of drywall during a Tuscany reno, what now?

Accepted Answer

Start by measuring the patch, because Health Canada's size bands determine who should do the cleaning.

If the patch is small (one to three areas, each under one square metre), a healthy person can clean it with water and dish detergent, wearing safety glasses, disposable household gloves and a disposable N95 respirator. No bleach is needed. Because drywall is porous, Alberta Health Services advises that porous materials like drywall typically require removal rather than surface cleaning, so the

Mold Causes & Moisture

Does poor grading around a Calgary house cause basement mold?

Bathroom fan not vented outside in my Calgary house, mold risk?

Window sills grow mold every Calgary winter, how to stop it?

Found mold on the back of drywall during a Tuscany reno, what now?