---
product_id: 12887514
title: "ChimneySaver FlashSeal Elastomeric Roof Chimney Flashing Sealant - Flexible and Long Lasting Waterproof Sealant to Stop Leaks Around Chimneys, Stacks, Vents & Skylights - 1 Gallon (White)"
brand: "chimneysaver"
price: "€ 204.39"
currency: EUR
in_stock: true
reviews_count: 7
category: "Chimney Saver"
url: https://www.desertcart.ie/products/12887514-chimneysaver-flashseal-elastomeric-roof-chimney-flashing-sealant-flexible-and-long
store_origin: IE
region: Ireland
---

# 100% waterproof barrier 1 gallon easy brush-on sealant 7-year durability warranty ChimneySaver FlashSeal Elastomeric Roof Chimney Flashing Sealant - Flexible and Long Lasting Waterproof Sealant to Stop Leaks Around Chimneys, Stacks, Vents & Skylights - 1 Gallon (White)

**Brand:** chimneysaver
**Price:** € 204.39
**Availability:** ✅ In Stock

## Summary

> 💧 Seal leaks like a pro—flexible, durable, and worry-free!

## Quick Answers

- **What is this?** ChimneySaver FlashSeal Elastomeric Roof Chimney Flashing Sealant - Flexible and Long Lasting Waterproof Sealant to Stop Leaks Around Chimneys, Stacks, Vents & Skylights - 1 Gallon (White) by chimneysaver
- **How much does it cost?** € 204.39 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/12887514-chimneysaver-flashseal-elastomeric-roof-chimney-flashing-sealant-flexible-and-long)

## Best For

- chimneysaver enthusiasts

## Why This Product

- Trusted chimneysaver brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built to Last:** Synthetic rubber formula stays flexible for years—no cracking, chipping, or brittleness.
- • **Leakproof Confidence:** Stops water leaks at chimneys, vents & skylights with a flexible, waterproof membrane.
- • **Effortless Application:** Smooth brush-on formula cleans up with soap & water—no mess, no stress.
- • **Universal Bonding Power:** Adheres permanently to asphalt shingles, metal, brick & more for seamless protection.
- • **Warranty-Backed Peace of Mind:** 7-year warranty when paired with FlashSeal Fabric ensures long-term leak defense.

## Overview

ChimneySaver FlashSeal is a premium elastomeric roof chimney flashing sealant designed to create a flexible, waterproof barrier that stops leaks around chimneys, vents, stacks, and skylights. Its synthetic rubber formula ensures long-lasting flexibility without cracking or hardening. Easy to apply with a brush, it bonds permanently to various roofing materials and comes with a 7-year warranty when used with FlashSeal Fabric, making it the ultimate solution for durable, professional-grade roof leak repairs.

## Description

FlashSeal is a versatile and easy-to-use flashing repair system that, when dry, forms a flexible, waterproof membrane. It’s formulated for permanent adhesion to asphalt shingles, metal flashings, brick, and other chimney and roofing materials. Use FlashSeal to solve problem leaks around the base of chimneys, stacks, and vents. It is also great for sealing around skylights. Repairing flashings that have been tarred over, split, cracked, or are in disrepair is easy with FlashSeal. It’s like installing a custom-fit rubber boot at the base of the chimney! It remains permanently flexible and has a 7 year warranty when used with FlashSeal Reinforcement Fabric.

Review: Repaired two leaking chimneys! - I've used Flashseal to repair two leaking chimneys. It's very easy to "paint" on. If you want a nice straight edge just use some duct tape to tape off the chimney. I pretty much used a full gallon on each chimney. I'm so happy with the results that yesterday I used Flashseal to repair leaks on an enclosed trailer roof. I used the fiberglass tape and found it quite easy to cover with Flashseal. I can't speak for longevity yet but if it gets close to the 7 year guarantee I'll be very happy.
Review: Sealed great - Finally found something other then caulking that seems to work. We have had leaky air vents that left a gap between the brick and wood , gave this a try and so far no more water leaks. Don’t know if we will have to reapply in a few years yet but so far so good.

## Features

- STOPS WATER LEAKS: Ideal for chimney flashing repair, FlashSeal creates a flexible waterproof barrier to stop leaks where chimneys meet the roofline; also works great for sealing around vents, stacks, and skylights
- LONG-LASTING FLEXIBILITY: Made from durable synthetic rubber, this roof chimney sealant won’t crack, chip, or become brittle; it stays flexible over time, ensuring reliable protection without hardening or losing its effectiveness
- EASY TO APPLY ELASTOMERIC SEALANT: This flashing chimney sealer applies smoothly with a brush (not included); apply about 1/8” of coating to the surface, making sure to fill all cracks and holes; cleans up easily with soap and water
- STRONG ADHESION: This chimney waterproofing sealant is designed for permanent bonding to asphalt shingles, metal flashing, brick, and other roofing materials; available in black, brown, and tintable white to match or complement your surface color
- CHIMNEY REPAIR PRODUCTS WITH 7-YEAR WARRANTY: Backed by a 7-year warranty when used with FlashSeal Fabric (sold separately), this chimney roof flashing sealant provides long-lasting protection and peace of mind for chimney flashing repairs

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | ChimneySaver |
| Item Weight | 14 Pounds |
| Item dimensions L x W x H | 48 x 16 x 32 inches |
| Material | Rubber |
| Style | Custom |
| Water Resistance Level | Waterproof |

## Product Details

- **Brand:** ChimneySaver
- **Item Weight:** 14 Pounds
- **Item dimensions L x W x H:** 48 x 16 x 32 inches
- **Material:** Rubber
- **Style:** Custom

## Images

![ChimneySaver FlashSeal Elastomeric Roof Chimney Flashing Sealant - Flexible and Long Lasting Waterproof Sealant to Stop Leaks Around Chimneys, Stacks, Vents & Skylights - 1 Gallon (White) - Image 1](https://m.media-amazon.com/images/I/61yvek86fYL.jpg)

## Available Options

This product comes in different **Color** options.

## Questions & Answers

**Q: does cloth come with the sealant?**
A: Negative. As of 12/5/2016, there isn't a 'with cloth' option.

**Q: Does the finished seal need to be coated to provide uv protection and extend the life?  if so, what coatings are acceptable?**
A: No, not to my knowledge. My metal flashing rusted out and I had a temporary patch with some other product (applied like caulking), but that failed in a year. Then I tried this product because I knew it was going to be temporary also because my roof was going to be replaced eventually. So, the reinforcement fabric is a must and follow the directions carefully. It held for 4 years until I eventually replaced my roof. I did not apply any sealant or UV protection product over it.

**Q: Has anyone used this around the flashing of a skylight?**
A: No, but if you use the correct detail around the skylight curb, I do not see why it would not work.

**Q: Where can I get a copy of the Material Safety Data Sheet on Flash Seal?**
A: http://chimneysaver.com/product-datasheets/https://saversystems.s3.amazonaws.com/product-data/chimneysaver-flash-seal-sds.pdf

## Customer Reviews

### ⭐⭐⭐⭐⭐ Repaired two leaking chimneys!
*by O***T on March 2, 2020*

I've used Flashseal to repair two leaking chimneys. It's very easy to "paint" on. If you want a nice straight edge just use some duct tape to tape off the chimney. I pretty much used a full gallon on each chimney. I'm so happy with the results that yesterday I used Flashseal to repair leaks on an enclosed trailer roof. I used the fiberglass tape and found it quite easy to cover with Flashseal. I can't speak for longevity yet but if it gets close to the 7 year guarantee I'll be very happy.

### ⭐⭐⭐⭐⭐ Sealed great
*by L***N on April 24, 2019*

Finally found something other then caulking that seems to work. We have had leaky air vents that left a gap between the brick and wood , gave this a try and so far no more water leaks. Don’t know if we will have to reapply in a few years yet but so far so good.

### ⭐⭐⭐⭐⭐ Applies well, and so far so good!
*by F***K on October 8, 2017*

So far it paints on as expected. I actually color mixed it with cement color, to match my shingle color, which worked out very well. I'm giving 5 starts for the application part of the product, but of course one can only tell in 5 or 10 years how it held up!

## Frequently Bought Together

- ChimneySaver FlashSeal Elastomeric Flashing Sealant, 1 Gallon (White)
- FlashSeal Reinforcement Fabric, 1 roll 6"  x 150 ft
- ChimneyRx 300119 Masonry Chimney Water Repellent - Siloxane Based, Non-Film-Forming, Breathable, and Transparent Waterproof Coating for Brick Chimneys & Other Vertical Surfaces - 1 Gallon

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*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-02-18*