A chimney admits water through five distinct paths, and every comprehensive waterproofing job has to address each one. Skipping any one of them produces a system that “almost” works — and a chimney that “almost” sheds water rots from the inside.

1. The Cap

The chimney cap (sometimes called the rain cap or spark arrestor cap) sits over the flue termination and prevents direct vertical rain entry into the flue. A missing or damaged cap allows water to fall directly into the flue, where it saturates the smoke shelf, the firebox masonry, and over time the exterior brick from the inside out. We inspect every cap, replace any missing or damaged cap with a stainless steel multi-flue or single-flue cap to manufacturer spec, and integrate cap replacement into the waterproofing scope when needed. See our chimney cap installation page for cap-specific work.

2. The Crown

The concrete or mortar cap surrounding the flue tile at the top of the masonry. Cracked crowns, under-spec crowns, and crowns lacking proper overhang dump rainwater directly onto the upper brick courses. We inspect every crown and address failures as either a CrownCoat repair (crown rebuild page) or a full demolition-and-rebuild before any waterproofing sealer is applied. Sealing over a failed crown traps water inside the chimney structure.

3. Mortar Joints

Receded, cracked, or fully open mortar joints in the brick face are the single largest water entry path on most DFW chimneys. Brick is moderately porous; mortar is highly porous when deteriorated. A stack with 30 years of unaddressed mortar erosion is essentially a sponge. We address joint failure with selective tuckpointing or full repointing (tuckpointing page) before any sealer is applied. Sealer applied over deteriorated joints is throwing money on a problem.

4. Flashing

The metal flashing system at the chimney-roof intersection — typically step flashing woven into the roofing courses, with counter-flashing tucked into a reglet cut in the brick — is the most failure-prone water entry point on the entire chimney system, and the leading cause of “chimney leaks” that turn out to be flashing leaks. Flashing fails through tar deterioration, fastener pull, masonry-side reglet failure, or simple installation error (we routinely tear out flashings that were never woven into the shingles to begin with). Flashing repair is a separate scope from sealer application; we quote it line-itemed.

5. The Brick Face Itself

Brick is moderately water-absorbent. A typical residential face brick admits 8-15% of its weight in water during a 24-hour rain event, and that absorbed water either evaporates back out (in dry weather) or freezes in place (in winter). The freeze-thaw cycling is what spalls the brick face off in chunks. A vapor-permeable sealer applied to sound brick reduces water absorption by 95%+ while still allowing internal moisture to escape — exactly the right behavior. This is the only water entry point that the sealer alone is designed to address.

This is the single most important section on this page, and the single most-violated principle in the home-services trade. Pay attention if you have ever been quoted “chimney sealing” by a roofer or a generalist handyman:

Silicone Caulks and Silicone Sealers Are Wrong for Chimneys. Period.

Silicone, urethane, latex, and the cheap “masonry sealers” sold in big-box stores are vapor-impermeable — they form a continuous film that water cannot pass through in either direction. Applied to a chimney, silicone-class sealers do two things:

1. They prevent rain from entering the brick from the outside (the intended effect).
2. They prevent the moisture already inside the brick — from absorbed humidity, from internal flue condensation, from the residual moisture every chimney accumulates — from evaporating out the brick face, which is the only place it can go.

The trapped moisture freezes during winter cycling, expands 9% in volume, and spalls the brick face off in sheet-sized chunks. Within 3-5 winters of silicone application, a previously sound chimney looks like the surface of the moon. We have torn out and rebuilt several chimneys destroyed by silicone-based “waterproofing.” It is the worst thing you can do to masonry.

Vapor-Permeable Siloxane Sealers Are Correct. Here’s Why.

Modern chimney waterproofing uses siloxane-class sealers — specifically ChimneySaver Water Repellent from SaverSystems, the industry-standard product PCE installs as our default. Siloxane molecules bond to the silica content in brick and mortar, line the pore walls, and produce a hydrophobic surface that repels liquid water — but the sealer does not form a continuous film. The pores remain open at the molecular level, which means water vapor (gaseous water, smaller in size than liquid water droplets) passes freely through the sealer in either direction. Liquid rain stops. Internal moisture escapes. The chimney breathes.

ChimneySaver carries a 10-year manufacturer warranty when applied by certified technicians. PCE has been a SaverSystems applicator for over a decade. Every application is registered with the manufacturer for warranty enforcement.

1. Full On-Roof Inspection

A PCE technician climbs the stack, photographs every face, inspects the cap, the crown, every mortar joint, the flashing system, and the brick face itself. We use a moisture meter on the brick to identify saturated areas, and a flashlight inside the firebox and the smoke shelf to identify visible water staining. Inspection takes 30-45 minutes and is free.

2. Leak-Source Diagnosis (When a Leak Is Active)

If the homeowner is presenting an active leak (water entering the home through the chimney), we run a leak-source diagnosis. This typically involves a controlled water test — we run a garden hose at low pressure on each suspected entry point in sequence (face, flashing, crown, cap), 5-10 minutes per zone, while a second technician monitors the interior for water entry. The water test isolates the actual entry point, which often turns out to be flashing rather than masonry. Diagnosis is included in the inspection scope.

3. Underlying Repair

We do not seal a chimney that needs repair. The order is non-negotiable: repair first, seal second. Depending on what we find, the repair scope can include any combination of:

• Cap replacement (if missing or damaged)
• Crown repair or full rebuild
• Tuckpointing or full repointing
• Brick replacement (for spalled or cracked brick)
• Flashing repair or full replacement
• Smoke shelf re-parging

Each repair is line-itemed in the written quote so the homeowner sees the breakdown.

4. Sealer Application

After all repairs have cured (typically 28 days for new mortar, 7 days for new crown), we apply ChimneySaver Water Repellent. Application is a low-pressure brushed or sprayed flood coat — applied wet-on-wet until the brick stops absorbing — followed by a second flood coat 30-60 minutes after the first has begun to penetrate. Application requires dry weather (no rain in the 24 hours prior or 24 hours following), brick dry to a moisture meter reading under 8%, and ambient temperature between 45°F and 95°F. We schedule around the weather; we do not apply sealer to wet brick or in marginal conditions because the manufacturer’s 10-year warranty depends on correct application conditions.

5. Flashing Repair (When Required)

If flashing is the diagnosed leak source, we either replace the failed flashing with new step + counter flashing (typically aluminum or copper, depending on roof material), or we coordinate with the homeowner’s roofer if the work scope crosses into roofing trade territory. We do not “tar over” failed flashing — that is the leading cause of recurring chimney leaks.

6. Documentation and Warranty Registration

Every job ends with a photo packet (before, during, after), a written summary of work performed, a copy of the SaverSystems sealer warranty registration, and registration into our lifetime workmanship warranty database.

DFW chimney leaks cluster in two seasons, and understanding why explains the urgency:

Spring Storm Season (March-June)

The same atmospheric setup that produces the famous DFW supercell thunderstorms — gulf moisture meeting dryline meeting jet stream — produces driving rain at 40-60 mph horizontal velocities, often combined with hail. Driving rain at 40+ mph penetrates masonry roughly 4× more aggressively than vertical-falling rain at the same volume. The water is literally blown into the brick face and the mortar joints. A chimney that does not leak in normal rain often leaks in driving spring storms because the failure threshold is exceeded only under wind-driven conditions. Spring storm leaks are the leading reason for our May-June scheduling load.

Freeze-Thaw Winter (December-February)

The 28-35 freeze-thaw days per DFW winter are the second peak. Water absorbed during a 60°F afternoon freezes overnight, expands, drives microcracks deeper, and on the next thaw admits more water. Three winters of unaddressed brick saturation and visible spalling appears.

Hail and Wind Damage

The DFW hail belt produces 1-3 major hail events per year. Hail damages crowns and erodes mortar; high straight-line winds damage flashing and dislodge caps. Post-storm chimney inspections are a year-round PCE specialty. Call 682-226-6257 after any major storm if you suspect chimney damage; documentation is at no charge.

Waterproofing pricing on DFW chimneys breaks into sealer-only and full-scope categories:

Sealer Application Only (When Underlying Masonry Is Sound)

• Standard single-flue stack, average size: $300-$-+
• Double-flue or larger stack: $550-$-+
• Tall stack or difficult access: $900-$-+

Sealer + Mortar Repair (Most Common)

• Sealer + spot tuckpointing: $1,400-$-+
• Sealer + selective tuckpointing + crown coat: $2,400-$-+

Full-Scope Waterproofing System

• Sealer + crown rebuild + tuckpointing + flashing repair: $4,500-$-+0+

Every quote is itemized, in writing, and registered into our lifetime workmanship warranty at sign-off. The sealer carries a separate 10-year manufacturer warranty.

Case Study 1 — Trophy Club: Post-Hail Leak, Vaquero Drive

A 5,200 sq ft custom on Vaquero Drive in Trophy Club, leak presenting on a master bedroom ceiling 48 hours after the May 2025 hail event. Homeowner’s roofer eliminated the roof. Our inspection identified hail-eroded mortar on the southwest face plus a hairline crown crack as the combined entry path. Water test confirmed entry through both points. We quoted: selective tuckpointing southwest face ($1,800), CrownCoat application ($650), full ChimneySaver flood coat ($550), and provided written documentation for the insurance claim. Insurance approved $2,700 of the $3,000 total. Lifetime warranty registered. Sealer warranty registered. Call 682-226-6257 for post-storm assessments.

Case Study 2 — Keller: Flashing Failure Misdiagnosed as Brick Leak

A 3,800 sq ft Hidden Lakes home in Keller, persistent chimney-side ceiling stain that two prior contractors had attempted to fix by “sealing the brick” with silicone. Our water test isolated the actual entry point as failed step flashing on the up-slope side of the chimney. The silicone applications had additionally trapped moisture inside the brick, producing visible spalling on three faces. We removed the silicone with a chemical stripper, replaced the entire step + counter flashing system in copper, repaired three spalled bricks, and applied vapor-permeable sealer once the brick had dried. Total cost: $4,800. Leak resolved. Lifetime warranty registered. The homeowner had spent $2,400 on the failed prior attempts.

Case Study 3 — Grapevine: Vapor-Permeable Sealer Application on a 2014 Custom

A 4,100 sq ft Grapevine custom, original 2014 construction, no active leak but homeowner wanted preventive waterproofing after reading about freeze-thaw damage. Our inspection confirmed sound masonry, sound crown, sound flashing, sound cap. Pure preventive scope. We applied a two-coat ChimneySaver flood at $525, registered the 10-year sealer warranty, and registered the workmanship under our lifetime warranty. The homeowner now has a brick face that absorbs less than 5% of its previous water uptake, which translates directly into 50+ years of additional brick service life.