How Much Does Chimney Waterproofing Cost in Minneapolis, MN?

By Garrett Sullivan, 16 years of experience · November 13, 2026 · 6 min read

In Minneapolis, our listed prices do not include a chimney waterproofing starting price: chimney inspections start at $39, and chimney cleaning starts at $89. The waterproofing cost depends on the chimney’s condition and whether masonry repairs need to come first.

Our Starting Prices in Minneapolis

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What Determines Chimney Waterproofing Cost?

The cost of waterproofing a chimney depends on the masonry that needs treatment and whether damaged mortar, bricks, the crown, or flashing need repair first. A water-repellent treatment is not a substitute for repairing gaps or loose masonry; applying it over damage can leave the source of a leak untouched.

Our listed starting prices are $39 for a chimney inspection and $89 for chimney cleaning. Those are separate services, not a price for waterproofing. A proper assessment should identify the affected surface and any repair work before you compare estimates.

Ask whether the estimate covers preparation, treatment of the identified masonry, and any recommended repairs. You can review our prices and read about our chimney waterproofing service before booking.

Which Chimney Water Signs Point to Waterproofing?

Water stains can have more than one cause, so the location and condition of the chimney matter. Look from a safe place on the ground and inside the home; do not climb onto the roof to inspect masonry.

• White or powdery deposits — Efflorescence can appear when moisture moves through masonry and leaves mineral deposits on the surface. It signals moisture movement, but it does not identify the entry point by itself.
• Deteriorating mortar or brick — Crumbling joints, loose mortar, or flaking brick indicate masonry damage that may need repair before water repellent is considered. Waterproofing alone does not put missing mortar back.
• Damp marks near the fireplace — A stain or musty smell indoors can come from water entering the chimney area, but flashing, a crown, or another building detail may be involved. Note where and when the mark appears for the inspection.
• Visible gaps at the chimney top — Cracks or open joints around the crown can let water reach vulnerable masonry. A ground-level view with binoculars can help you spot a concern; leave close roof inspection to a professional.

Which Chimney Repair Should Come Before Waterproofing?

The right work depends on where water is getting in and whether the masonry is sound. These options address different problems, so a treatment should follow the diagnosis rather than replace it.

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How Do Common Chimney Problems Affect the Starting Price?

These examples show which of our listed starting prices may relate to the next step. They are not waterproofing quotes, and the inspection findings determine what work is appropriate.

For a chimney with suspected water entry but no confirmed cause, a chimney inspection starts at $39. The inspection is the relevant starting point for identifying whether the concern involves masonry, the crown, flashing, or another area.

For a chimney that needs soot or debris removed as part of separate maintenance, chimney cleaning starts at $89. Cleaning does not waterproof masonry or repair a leak. If mortar damage is visible, ask whether tuckpointing or another masonry repair should be addressed before treatment.

What Should You Check Before a Chimney Waterproofing Assessment?

A few safe observations can help focus the assessment. Keep off the roof and do not apply a coating before the source of moisture is identified.

1. Note where water appears — Write down whether the sign is indoors, on the chimney exterior, or near the roofline. The location helps distinguish a wall or roof-junction concern from moisture in the flue area.
2. Record when you notice it — Note whether the mark appears after rain or persists between wet weather. This timing gives the chimney sweep useful context, though it does not prove the source.
3. Look for visible masonry changes — From the ground, use binoculars if available to check for cracked bricks, open mortar joints, or an uneven-looking crown. Do not lean out of windows or climb a ladder to get a closer view.
4. Check the room around the fireplace — Look for staining, dampness, or a musty odor near the firebox and surrounding wall. Keep notes about the exact location instead of covering or painting over the mark.
5. Take photographs from a safe position — Use a phone camera or binoculars from the ground to document visible changes. Check that the images show the location clearly, but do not use a drone or climb onto the roof for a closer shot.
6. Ask what the proposed treatment covers — Request a clear description of the masonry to be treated and any preparation or repairs proposed first. Check that the recommendation addresses the observed moisture path rather than simply coating every surface.
7. Compare the repair sequence — If an estimate includes mortar, crown, or flashing work, ask which repair comes first and why. The final treatment should not conceal unresolved cracks or failed joints.

What Can Go Wrong If You Waterproof Before Repairing the Chimney?

Treating the wrong surface can leave the actual water entry point unchanged. For example, coating masonry will not repair a failed mortar joint, a damaged crown, or a leak at the flashing; the moisture can continue and masonry deterioration can progress.

A coating chosen without checking the surface can also create a poor result. Ask what product is intended for the chimney masonry and how the surface will be prepared. Do not seal a damp, loose, or visibly damaged area as a substitute for finding the cause.

Call a chimney sweep when you see loose or crumbling masonry, recurring indoor dampness near the fireplace, or damage near the chimney top that you cannot inspect safely. Our chimney sweep in Minneapolis can assess the concern, explain the work clearly, and recommend only services a homeowner needs.

Need help now? (612) 806-0154

How Do You Book Chimney Waterproofing in Minneapolis?

Call MN Chimney Sweep at (612) 806-0154 to book an assessment; we are open 24 hours a day, 7 days a week, and same-day service is available. Share what you noticed, where it appears, and whether the issue returns after rain so the concern is clear when you arrange the visit.

During the assessment, ask what condition the technician found, whether repairs should come before waterproofing, and what the proposed work includes. This lets you compare the recommendation with the actual problem instead of choosing a treatment based only on a surface stain.

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