Regularly checking the top of the chimney and flashing is crucial, as this is the most common place for leaks to occur in the entire roof.
Here are the main reasons why it is worth doing this:
- Protection against flooding and mold
Leakage:
Even a small leak in the flashing allows water to flow directly into the house, causing stains on ceilings and walls.
Rotting roof trusses: Moisture getting under the sheet metal destroys the wooden roof structure and insulation (mineral wool), which drastically reduces the energy efficiency of the building.
Mold:
A damp wall near the chimney is an ideal place for fungi to grow, which pose a threat to the health of the household. - Preventing the chimney from “bursting” (frost cycle)
Water that penetrates the gaps between the sheet metal and the brick freezes in winter. Ice increases in volume, leading to cracking of joints, bricks, and crumbling of the chimney cap. Regular inspection (preferably after each winter) allows for minor repairs with sealant before the entire chimney requires costly rebuilding. - Fire safety and patency
Condition of the cap:
If the concrete “top” of the chimney cracks, debris can fall inside, blocking the flue or ventilation duct.
Flue gas tightness: A leaky chimney poses a risk of carbon monoxide or fire escaping into the house. - Saving money
A minor repair of the silicone seal or re-hammering roofing nails costs pennies. A complete replacement of the flashing or rebuilding of a damaged chimney is an expense of several thousand zlotys.
Roofers and masons recommend having an inspection once a year, preferably in the fall before the heating season or in the spring after the worst frosts.
We provide services in three cities: Mississauga, Oakville, Toronto.
Is a crooked chimney in Mississauga and Oakville dangerous, and how much time do I have to rebuild it?
A crooked chimney is a structural hazard. This is no joke - if the chimney has clearly deviated from the vertical, time is working against you.
Why is it dangerous?
- Risk of collapse: A chimney is a huge mass (several hundred kilograms to several tons). A tilt means that the center of gravity is off-axis. Stronger winds, water-soaked bricks, or a shock can cause it to collapse onto the roof, piercing the ceiling or injuring someone below.
- Duct leakage: When a chimney tilts, cracks form inside. Carbon monoxide or sparks can escape through these cracks into the house, posing a risk of attic fire.
- Roof damage: As the chimney “works,” it tears apart the aforementioned flashings, causing immediate and massive flooding of the house.
How much time do you have?
It depends on the cause, but in construction, three scenarios are assumed:
Immediate mode (days/weeks): If the cracks are fresh, wide, and you can see that the chimney is “working” (the gaps are getting bigger), you need to act immediately. Call a chimney sweep or builder to assess whether the chimney needs to be demolished urgently.
One season (months): If the chimney has been crooked “forever” (old construction errors) but is airtight and stable, you theoretically have time until next summer. However, winter is the worst time – frost in the cracks will accelerate the destruction process.
Until the first inspection: Building regulations require annual inspection of chimney flues. When a chimney sweep sees a crooked chimney, they are required to take it out of service, which means no more burning in the stove/fireplace.
What to do about it?
Usually, a crooked chimney cannot be “straightened.” There are two solutions:
- Demolition and rebuilding: Demolish the part above the roof and rebuild it (the safest option).
- Reinforcement with a steel structure: Sometimes steel corsets are used, but this is a temporary solution and often more expensive than replacing the bricks.
My advice: Don't wait until winter. Go up to the attic and see if there are any cracks where the chimney passes through the ceiling. If so, call a professional today.
We provide services in three cities: Mississauga, Oakville, Toronto.
Do you live in Mississauga or Oakville and your chimney is “weeping”? Before you tear it down, check the grout!
Many homeowners panic when they see crumbling joints or moisture on their chimney. Their first thought? “It needs to be rebuilt.” Stop! In most cases, professional grouting is all that is needed to save the structure and thousands of dollars in your wallet.
When does a chimney need saving?
A chimney above the roof is exposed to the harshest conditions: rain, frost, and huge temperature differences. Over time, the mortar washes out and crumbles, opening the way for water. If you notice:
empty spaces between bricks,
moisture penetrating the interior of the building,
loose individual bricks,
it's a sign that it's time to take action. But don't worry – “action” does not necessarily mean a team with pickaxes.
Why is grouting the best solution?
Huge savings: Rebuilding a chimney costs several thousand dollars (materials, labor, scaffolding, debris disposal). Repairing the joints alone costs a fraction of that amount.
No demolition: The work is limited to the outside of the chimney. You avoid mess in your home, dust, and the risk of damaging the roof covering during demolition.
Instant results: Professional joint filling and possible clinker impregnation restore tightness in one day.
How to do it right?
Instead of rebuilding, opt for renovation:
Cleaning the joints: Remove loose, weathered mortar to a depth of approx. 1.5–2 cm.
Suitable mortar: The key is to use mortar that is resistant to frost and high temperatures, preferably with the addition of trass (prevents efflorescence).
Watertightness from above: It is often enough to repair the chimney cap to prevent water from pouring into the wall structure.
Summary
Don't be persuaded to undertake a costly reconstruction if the chimney structure is stable. Often the problem is not a “bad chimney” but simply “worn mortar.” Invest in proper sealing – your chimney will regain its tightness and you will save money for other household expenses.
We provide services in three cities: Mississauga, Oakville, Toronto.