It is always difficult when it comes to decide and making final call choosing sealant for chimney flashing, hence we are here today so be sure to check the product reviews that will solve your confusion and save time. Reviews are a great way to find out if the product is right for you and whether it has any design flaws. If there are multiple bad reviews, you may want to look at other products. Negative reviews can tell you a lot about the product, including things you may not have thought to consider. They can tell you about any potential issues with the product. They can also tell you about issues with the manufacturer’s customer service. To help you out, we’ve collected reviews of what we think are the sealant for chimney flashing this year. Before you proceed with anything, read through our thoughts on the top sealant for chimney flashing, as well as an overview of what you need to know when considering your buying
This is the ultimate buyers guide sealant for chimney flashing.
Our Top Picks
The Best sealant for chimney flashing
FlashSeal Elastomeric Flashing Sealant, 1 Gallon (Black)
$120.83
in stock
6 new from $114.99
Free shipping
Amazon.com
as of June 16, 2025 5:57 pm
Features
- 7 Year Warranty (When Used With FlashSeal Fabric, Sold Separately)
- Stops Leaks From Flashings Around Chimneys, Stacks, Vents, & Skylights
- Easy Brush Application (Brush Not Included), Soap & Water Cleanup
- Significantly Outlasts Tar-Based Sealers
- 1 Gallon Size Covers 28 Sq. Ft.
MasonryDefender Chimney Flashing Sealer - Flexible Coating That Protects Chimney Flashings from Water Leaks
$46.99
in stock
2 new from $46.99
Free shipping
Amazon.com
as of June 16, 2025 5:57 pm
Features
- Seals & Waterproofs Chimney Flashings - Stops Water Penetration Where Chimneys Meet the Roof Line
- Flexible - Won't Crack or Chip - Stays Flexible Over Time, Doesn't Harden and Become Brittle
- Helps Prevent Chimney Leaks - Chimneys Frequently Leak Where the Roofline Meets the Chimney - Seal it to Stop Water Fast
- Easy to Apply With a Paint Brush - Simply Paint Product Around Base of Chimney for Long Lasting Protection
- Available in Black & Covers 14 Sq. Ft. Per Half Gallon Container
Chimney Rx Elastomeric 1/2 Gallon
$53.94
in stock
8 new from $53.94
Amazon.com
as of June 16, 2025 5:57 pm
Features
- ELASTOMERIC WATERPROOF SEALANT: Seals chimney flashing with a durable, flexible barrier; this chimney sealant prevents leaks around chimneys, stacks, vents, and skylights, providing protection against water and harsh weather
- STAYS FLEXIBLE, WON'T CRACK: Unlike tar-based sealants, this chimney repair sealer has an elastomeric formula that stays pliable over time, resisting brittleness and cracking that can cause leaks; it requires no mixing or special bonding agents
- BONDS TO MULTIPLE SURFACES: This waterproofing sealant adheres permanently to asphalt shingles, aluminum flashing, brick, and other roofing materials for a secure, long-lasting seal
- EASY APPLICATION & CLEANUP: Our chimney flashing sealant applies easily with a brush (not included), making repairs quick and simple; cleanup is hassle-free with just soap and water, saving you time and effort
- DRY TIME & COVERAGE: This waterproof coating sealant dries in 12 hours under dry weather conditions, with a temperature range of 45-90°F; each 1/2-gallon plastic container covers approximately 14 square feet
Liquid Rubber Waterproof Sealant - Multi-Surface Leak Repair Indoor and Outdoor Coating, Water-Based, Easy to Apply, Original Black, 1 Gallon
$69.95
in stock
3 new from $69.95
Free shipping
Amazon.com
as of June 16, 2025 5:57 pm
Features
- INDUSTRIAL STRENGTH BITUMEN FORMULA - Create a seamless waterproof membrane on flat roofs, metal roofs, low slope roofs, foundations, gutters, concrete surfaces, planter boxes, and more. Our premium liquid rubber forms a durable barrier against water infiltration where other sealants fail. Superior alternative to traditional roof tar or patch products
- SUPERIOR FLEXIBILITY & DURABILITY - With over 950% elongation, this waterproof sealant maintains adhesion even with building movement and temperature changes. Our sealant is designed to resist cracking, peeling, and UV damage. Creates a flexible rubberized coating that delivers long-lasting protection
- PROFESSIONAL COVERAGE SPECIFICATIONS - Brush, roll or spray on - For flat/low slope roofs & standing water surfaces: 1 gallon covers 15 sq ft (3-4 heavy coats to achieve 60-80 mil membrane). For vertical surfaces like foundations: 1 gallon covers 30 sq ft (2-3 heavy coats for 30 mil membrane). Ideal for both roof repair and preventative maintenance applications
- WATER-BASED ADVANCED FORMULA - Unlike harsh roof tar or solvent-based products, our water-based formula contains no VOCs or harmful odors, making it perfect for indoor and outdoor use. Doesn't damage foam insulation or sensitive materials. Perfect for waterproofing projects in confined spaces
- ENGINEERED WATERPROOFING SYSTEM - For maximum protection, use with Liquid Rubber Seam Tape or Geo-Textile to bridge joints, seams, vents, skylights, and protrusions where movement may occur. Creates a comprehensive waterproofing system for long-lasting leak repair and prevention on your roof, basement, or foundation
BXI Flashing Roll Tape Membrane, 4 inches X 32 Feet Thick Waterproof Patch Seal Tape, Self-Adhesive SBS Modified Rubberized Asphalt, Deck Seam Joist Leak Sealant for Roof Window Gutter Repair Outdoor
$22.99
in stock
Amazon.com
as of June 16, 2025 5:57 pm
Features
- 【SPECIFICATION】: Material: High quality SBS polymer modified rubber asphalt with silver aluminum foil backing & polyethylene film; Size: 4 Inches (Width) X 32 Feet (Length) X 0.06 Inches (Thickness); Weight: 4 pounds; Temperature range: 5°F( -15℃) to 158°F( 70℃)
- 【EXCEPTIONAL WATERPROOFING】: When applied to a surface, the bitumen in our waterproof tape gradually penetrates into any existing cracks or gaps, filling them entirely. This process ensures the tape delivers an impressively strong and long-lasting seal for leaks
- 【OUTSTANDING FEATURES】: This roofing material is super sticky and keeps stretchy even at low temperatures. It has smooth aluminum foil backing, which is paintable and UV-resistant. Besides, it’s thick, durable, flame retardant, puncture resistant and abrasion resistant
- 【VERSATILE APPLICATIONS】: Ideal for indoor/outdoor repairs, our sealing tape excels in waterproofing & repair tasks on roof, window, door, deck joist, pool, pipe, RV roof, mobile home, chimney, basement, gutter, air vent, construction joint, concrete wall, plywood, outdoor container, water tank, beams etc
- 【SIMPLE INSTALLATION】: Our easy-to-use, self-adhesive tape requires no primer or torching. It is effortless to cut it with a utility knife or scissors without leaving residue. It adheres best to smooth, flat, and dry surfaces
Loctite PL S30 Black Roof and Flashing Sealant 10-Fluid Ounce Cartridge (1618181)
$19.94
in stock
5 new from $9.85
Amazon.com
as of June 16, 2025 5:57 pm
Features
- Professional Grade Sealant: Premium durable polyurethane formula developed especially for forming permanent, weatherproof seals without deteriorating
- Roofs Chimneys: Seals all exterior gaps and expansion joints and is paintable to blend in with surrounding surfaces for a professional finish
- Durable Flexible: Remains permanently flexible to resist corrosion, as well as tears with just one-time application; can be used on expansion joints, 25 movement
- Weatherproof: Withstands harsh exterior environments and is UV and ozone resistant without softening in the sun
- Low VOC: Polyurethane formula with low VOC emissions and meets strict federal and state guidelines
Sashco - 14010 Through The Roof Sealant, 10.5 oz Cartridge, Clear (Pack of 1)
$16.45 in stock
14 new from $11.98
Free shipping
Amazon.com
as of June 16, 2025 5:57 pm
Features
- Elastic - flexes with temperature changes and wind
- Ultra-clear and stays clear - will not yellow over time
- Excellent UV resistance
- Adheres to most existing roof patches
Chimney Brick Sealer, Clear Water-Based Siloxane Sealer - Breathable Waterproofer for All Exterior, Vertical Masonry Surfaces, 1 gal
$37.49
in stock
2 new from $37.49
Free shipping
Amazon.com
as of June 16, 2025 5:57 pm
Features
- A CHIMNEY SEALANT WITH ENDURING PERFORMANCE: This brick protector creates a permanent bond with your chimney’s masonry for durable protection. It allows trapped moisture to escape, preventing freeze/thaw damage and ensuring lasting effectiveness
- SILOXANE BRICK SEALER PREVENTS LEAKS: Chimney waterproofing is important because cracks in your chimney can let water seep into the home; this water repellent effectively seals & waterproofs your chimney, protecting your home from water intrusion
- BREATHABLE BRICK SEALER EXTERIOR PROTECTION: This non-film forming sealant spray offers breathable, superior protection without altering surface color for residential chimneys, brick walls, and vertical masonry surfaces like stone, stucco, and more
- EASY APPLICATION WATER-BASED CHIMNEY WATERPROOFING SEALANT: Apply 2 coats of chimney sealer with a pump-up sprayer while using drop cloths to prevent overspray, but product is water based & VOC compliant, so it’s easy to clean up
- COVERAGE & DRY TIME: Our siloxane brick sealer covers 80-150 sq. ft. per gallon (2 coats). Dries to touch in 2-6 hours after you spray sealer. Waterproof in 4-6 hours, with continued strengthening over several weeks
CHIMNEYRX Brushable Chimney Crown Repair, 1 Gallon
$74.89 in stock
10 new from $74.75
1 used from $68.21
1 used from $68.21
Amazon.com
as of June 16, 2025 5:57 pm
Features
- ELASTOMERIC WATERPROOF SEALANT: Creates a durable, flexible waterproof membrane that seals and protects chimney crowns from water intrusion; this chimney sealant prevents leaks, cracking, and deterioration, ensuring long-lasting protection
- FLEXIBLE CHIMNEY REPAIR SEALER: Perfect for sealing small cracks and surface flaws in chimney crowns; this long-lasting, flexible sealer won’t crack or chip over time and requires no mixing or special bonding agents; not for gaps or cracks over ¼”
- VERSATILE & EASY TO APPLY: Ideal for chimney crowns, corbels, parapets, and masonry sills; no primer needed, just brush on two coats of this waterproofing sealant for a strong, weatherproof barrier; can be tinted with mortar dye for a seamless look
- SURFACE PREPARATION: Ensure the surface is clean and dry; use a stiff poly or wire brush to remove loose particles; protect the roof with drop cloths to prevent spills; this chimney crown sealer is solvent-free and safe for the surroundings
- DRY TIME & COVERAGE: This waterproof coating sealant cures in 2-4 hours, depending on temperature and humidity; it covers about 40 square feet per gallon
HENKEL Caulk & SEALANTS 1938618 Loctite Osi Brand Rf-140 Magic Roof and Flashing Sealant, Black, 10.2 Oz. Cartridge-271903
$13.00
in stock
5 new from $7.70
Amazon.com
as of June 16, 2025 5:57 pm
Features
- OSI Pro Series RF140 has a unique rubber
- This is highly durable
- This is manufactured in United states
- Product Dimension: 1.0"L x 1.0"W x 1.0"H
The Video Review of Best sealant for chimney flashing
Conclusion
When you’re looking for sealant for chimney flashing, you’ll want to keep a few things in mind. First, decide what you want to use the sealant for chimney flashing for. Next, check the product reviews with comparision which we have listed as well. Once you’ve decided on sealant for chimney flashing you want to buy sealant for chimney flashing, look at the reputation of the manufacturer as well. You can compare prices and quality together before you make your purchase.