Best Chimney Brick Sealer (Buyer’s Guide)

The chimney brick sealer is an important part of the chimney system. It prevents water damage, which can lead to costly repairs. The sealant also helps protect your home from fire hazards that are associated with unsealed masonry chimneys. This buyer’s guide will help you find the best option for sealing your bricks and mortar so you can be assured that your family is safe!

Best Choice

Chimney Brick Sealer, Clear Water-Based Siloxane Sealer - Breathable Waterproofer for All Exterior, Vertical Masonry Surfaces, 1 gal
  • CLEAR PROTECTION – Provides a long-lasting, non-glossy invisible coat to masonry surfaces. Will...
  • WATER SEALANT – Water-based, siloxane penetrating brick sealer that bonds with the minerals in...
  • POWERFUL CHIMNEY SEALER – Keep your chimney leak free and protect it or other masonry surfaces...
  • EASY TO APPLY – First step is to ensure your chimney or masonry surface is fully cleaned and clear...
  • 5 YEAR WARRANTY – MasonryDefender offers a 5 Year Limited Warranty on Vertical Masonry Surfaces

This product has been made from 100% solids material. This means that there aren’t any dangerous chemicals in this Chimney Brick Sealer such as volatile organic compounds (VOCs). This siloxane sealer is non-toxic and it has been tested by the US Green Building Council.

Best Selling Chimney Brick Sealer

When it comes to chimney brick sealer, the choices can seem endless. With so many different manufacturers, prices and functions available on the market, how do you know which one is best for your needs? We’ve done some research and compiled a list of our top 5 favorite products. Take a look at these reviews and find out which chimney brick sealer will work best for you!

Best No. 1
Chimney Brick Sealer, Clear Water-Based Siloxane Sealer - Breathable Waterproofer for All Exterior, Vertical Masonry Surfaces, 1 gal
  • CLEAR PROTECTION – Provides a long-lasting, non-glossy invisible coat to masonry surfaces. Will...
  • WATER SEALANT – Water-based, siloxane penetrating brick sealer that bonds with the minerals in...
  • POWERFUL CHIMNEY SEALER – Keep your chimney leak free and protect it or other masonry surfaces...
  • EASY TO APPLY – First step is to ensure your chimney or masonry surface is fully cleaned and clear...
  • 5 YEAR WARRANTY – MasonryDefender offers a 5 Year Limited Warranty on Vertical Masonry Surfaces
SaleBest No. 3
Rain Guard Water Sealers - Brick Sealer - Penetrating Water Repellent Protection for All Porous Brick Surfaces - Water-Based Silane/Siloxane Sealant - Clear Natural Finish - Concentrate Makes 5 Gal
  • PREMIUM BRICK SEALER: Protect, restore, and extend the life of your home with Rainguard Water...
  • LONG LASTING PROTECTION: Engineered with Micro-Lok! This proprietary ingredient ensures sealer...
  • SUPER CONCENTRATED FORMULATION: Cost-effective, super concentrated sealing solutions! Rainguard...
  • EASY APPLICATION: Seamlessly seal masonry surfaces! Prior to applying Rainguard Brick Sealer,...
  • RAIN GUARD: Where innovation meets sustainability! Since 1969, Rainguard Water Sealers has been...

MasonryDefender Chimney Brick Sealer

Chimney Brick Sealer, Clear Water-Based Siloxane Sealer - Breathable Waterproofer for All Exterior, Vertical Masonry Surfaces, 1 gal
  • CLEAR PROTECTION – Provides a long-lasting, non-glossy invisible coat to masonry surfaces. Will...
  • WATER SEALANT – Water-based, siloxane penetrating brick sealer that bonds with the minerals in...
  • POWERFUL CHIMNEY SEALER – Keep your chimney leak free and protect it or other masonry surfaces...
  • EASY TO APPLY – First step is to ensure your chimney or masonry surface is fully cleaned and clear...
  • 5 YEAR WARRANTY – MasonryDefender offers a 5 Year Limited Warranty on Vertical Masonry Surfaces

Product Description

The Chimney Brick Sealer is a water-based siloxane sealer. It comes with an adjustable spray nozzle and it provides waterproofing to masonry surfaces such as concrete or brick that are outdoors. This product has been tested by more than 600 professionals including chimney builders, masons and architects. The Chimney Brick Sealer is breathable which means that it allows moisture vapor to escape so the surface does not get damaged by water or ice expansion.

The next thing I will discuss about this product is its working mechanism. This siloxane sealer penetrates deep into the brick and mortar joints where it reacts with calcium hydroxide. It forms a hard, clear seal that is resistant to water, ice expansion and the elements.

This product has been made from 100% solids material. This means that there aren’t any dangerous chemicals in this Chimney Brick Sealer such as volatile organic compounds (VOCs). This siloxane sealer is non-toxic and it has been tested by the US Green Building Council.

The Chimney Brick Sealer acts as a moisture repellant which means that this water based product prevents masonry surfaces from getting damaged due to humidity or freezing temperatures. It protects exterior masonry surfaces against water penetration and it resists water, ice expansion and the elements.

Pros

  • this product protects masonry surfaces against water penetration
  • it is breathable which means that it allows moisture vapor to escape
  • the Chimney Brick Sealer acts as a moisture repellant
  • non toxic and 100% solids material.

Cons

  • None.

Recommended?

Yes, the Chimney Brick Sealer is a great product and it has been recommended by many professionals. The next thing I will discuss about this water-based siloxane sealer is its pros and cons so you can decide whether or not you want to buy this product for your chimney bricks.

ChimneyRX Masonry Chimney Brick Sealer

Product Description

ChimneyRX Masonry Chimney Brick Sealer Water Repellent, a Permanent Water Barrier that Protects Against Flashings and Damages caused by Moisture.

This product has been specially formulated to protect masonry surfaces against the effects of moisture penetration and deterioration for an easy-to-apply, long lasting defense against the elements. An effective and permanent water barrier that protects against flashings and damages caused by moisture, ChimneyRX Masonry Chimney Brick Sealer Water Repellent is specially formulated to protect masonry surfaces such as brick, concrete block or stone from damage due to freezing and thawing of water in mortar joints; efflorescence; salt deposits and deterioration caused by moisture penetration. It can be applied to exterior masonry surfaces of residential or commercial buildings where water is directed against the walls, such as chimneys, flues, spouts and flashings.

See also
Best Universal Gas Thermocouple Sensor for Firepits Fireplaces Heaters (Buyer’s Guide)

ChimneyRX Masonry Chimney Brick Sealer Water Repellent provides protection for up to 15 years.

Pros

  • Protects against efflorescence
  • Prevents salt deposits which can cause discoloration and damage to brick mortar joints.
  • Can be applied directly to masonry surfaces for easy application, no sanding required.

Cons

  • Product is not quick drying.
  • Application will take a few days to dry depending on weather conditions and temperature of masonry surface.
  • May not be suitable for heavy traffic areas, such as patios.

Recommended?

Yes, ChimneyRX Masonry Chimney Brick Sealer Water Repellent is recommended for anyone who wants to protect their masonry surfaces from damage caused by moisture penetration. This product has been specially formulated to provide protection against the damaging effects of water on brick mortar joints and can be easily applied directly onto exterior masonry surfaces. It is a long lasting, easy to apply defense against the elements.

LastiSeal Brick & Chimney Brick Sealer

LastiSeal Brick & Concrete Sealer (2.5-gal) - Waterproofs and Strengthens Brick, Concrete, & Porous Masonry - 15-Year Service Life. Deep-Penetrating, Paintable, Natural Finish, No Slip, Indoor/Outdoor
  • Unsurpassed Protection and Service Life – 15-Year Waterproofing Warranty
  • Easy Application – Spray, Roll, or Brush
  • Bonds and strengthens, protects against freeze-thaw, prevents spalling, dusting
  • Waterborne, Safe, Eco-Friendly, Non-toxic, Non-flammable
  • Protects outdoor/indoor brick, concrete, masonry, grout, and even wood!

Product Description

No-slip grip, clear finish that is nearly invisible once applied. Prevents brick and concrete from water damage caused by freeze/thaw cycles. It can be used on natural or manmade stone surfaces which are porous including exterior masonry walls, chimneys, garage flooring & driveways. Penetrates deep into pores for a superior bond. It is not recommended for interior uses such as kitchen, bathroom & other food preparation surfaces.

The LastiSeal Brick and Chimney Sealer decreases water infiltration by sealing the surface of brick or concrete to create a lasting seal against moisture penetration. It helps prevent freeze/thaw erosion damage which can lead to more serious problems. The sealer penetrates deep into the pores of brick or concrete for a superior bond and does not leave a surface film that will trap dirt, dust & pollutants on the surface.

LastiSeal Brick Sealer has been specially designed to provide lasting protection against water damage in exterior masonry walls including chimneys, garage flooring and driveways. It can be used for exterior spaces such as decks and patios that are exposed to the elements year-round.

Pros

  • Can be used on most exterior surfaces including brick, concrete and porous stone
  • Provides a lasting barrier against water infiltration Prevents freeze/thaw damage to keep surface from cracking or spalling off. Penetrates deep into the pores for a superior bond with no film left behind which traps dirt & pollutants
  • Waterproofs and strengthens bricks.

Cons

  • Not the best option for interior surfaces such as kitchen, bathroom or other food preparation areas. It can be used on some indoor walls but must be allowed to fully dry before bringing into an area where liquids are present. Not recommended for use around swimming pools & hot tubs due to the risk of slipping in these high-moisture areas.

Recommended?

Yes. The LastiSeal Brick and Chimney Sealer is recommended for use on exterior masonry surfaces including brick, concrete & porous stone. It should not be applied to interior spaces such as kitchen or bathroom walls due to the risk of moisture damage which could cause mold growth in these areas that are constantly exposed to water.

What is a Chimney Brick Sealer?

  • A chimney brick sealer is a type of roofing material that helps to maintain the condition and extend the life expectancy of your masonry.
  • Many homeowners choose this as their preferred choice because it’s easy on maintenance, looks great already installed, and can save you money over time by lengthening the lifespan of an existing roof.
  • It is a great product for anyone who doesn’t want to worry about their roofing and just wants it to look good, last long time, and be maintenance free.
  • The most common chimney brick sealer is the acrylic variety because it offers good protection against UV rays, water, and other weather conditions.
  • Here are some of the best brands to check out if you want a high-quality product that will offer great value for your money.
  • There are a few different types of chimney brick sealers: penetrating, polymer and water-based.

Types of Chimney Brick Sealers

There are three main types of chimney brick sealers. The first is a silicone-based product, which can be applied by brush or sprayer to create an airtight barrier. Silicone products are the most popular type because they have great durability and weatherproofing qualities that promote longer service life for your chimney. However, you should be aware that silicone sealants are not fireproof, so you should never use them to seal a masonry heater.

The second type of chimney brick sealer is an acrylic-based product which requires special preparation for the surface and can’t be applied by brush or sprayer due to its thick consistency. However, it produces great durability, weatherproofing qualities and long service life. It is also fireproof, which means it can be used to seal masonry heaters or other solid fuel appliances that are vented with a chimney flue.

See also
How to Seal a Chimney (User’s Guide)

The last type of chimney brick sealer is an oil-based product, which requires special preparation for the surface and can be applied by brush or sprayer. While oil sealants are durable, weatherproofing products that provide long service life for your chimney, they’re not fireproof so you should never use them to seal a masonry heater.

So before picking the best chimney brick sealer product for your home’s needs, you should consider the type of protection that is necessary. If you’re looking for a product that will provide fireproofing qualities, then an oil-based sealant would be best. However, if your primary concern is durability and weather resistance, silicone or acrylic products are ideal.

Benefits of using a Chimney Brick Sealer

  • Increases safety around the fireplace.
  • Helps to prolong the life of your chimney.
  • Reduces the risk of water seepage into the flue tiles, which can potentially cause dangerous carbon monoxide poisoning.
  • Increases the life of your stove or fireplace.
  • It is easy to apply and clean up.
  • It is easy to clean.

What are the benefits of using a chimney brick sealer?

The best chimney brick sealer protects masonry surfaces from moisture penetration by sealing its pores, cracks or any other type of openings that could make it absorb water. The liquid can also prevent corrosion but this is not always the case.

In addition to this, a chimney brick sealer can also prevent mold and algae formation by keeping humidity at bay. If you live in an area where there is high exposure to rainwater or moisture from below ground level, using a masonry protector will improve your home’s overall durability as well as its overall look.

The best chimney brick sealers will prevent water penetration and keep your masonry surfaces free from damage such as corrosion or rusting. They can also be used to protect against mold growth, moisture build up and even UV rays that could affect its appearance over time.

How to use the best Chimney Brick Sealer?

When sealing the brick, you need to apply a thin coat of sealer. You can use brush or spray for this purpose and just follow the instructions on the label before application. The best Chimney Brick Sealer usually comes in various colors and it is important that you get one that matches with your home’s color scheme so that you don’t have to paint the entire home again.

You should plan on sealing your chimney at least once a year or every other season, depending upon how often you use it and weather conditions in your area. If you are using heaters that operate continuously for 24 hours, then consider applying sealer more frequently than just once or twice a year. Some heaters are so powerful that you should apply sealer every spring before using them for the next heating season.

The Chimney Brick Sealer should be applied in a thin coat and you need to make sure that no pooling of sealers occurs at any area. It is also important not to use too much pressure while applying the product as it may settle down into the bricks, making them look dirty instead of sealing them well.

You can apply a second coat of sealer after the first one dries up completely. The best way to determine when it is time for a second application is by checking if water stains return on your chimney bricks or not. If they do, then you need to apply another thin layer of sealer immediately and let it dry before using heaters in that area.

Seals bricks, stone & cement surfaces to prevent the penetration of water and moisture in chimney stacks, flues etc. sealing brick against weather conditions like rain, snow or ice which could damage your chimney stack at home

Sealing kills weeds below ground level – you wouldn’t want them growing up through your patio now, would you?

It is important to apply sealer on chimney bricks before they start looking dirty or stained. If your home has masonry brick work, then it’s time that you consider applying Chimney Brick Sealer for better protection against weather conditions and snow which can cause damage over the years if left unprotected.

Common questions about Chimney Brick Sealers

What is a chimney brick sealer?

A chimney brick sealer penetrates the porous surface of your bricks and masonry, forming an impermeable barrier. This keeps water from seeping through to the interior areas where it can damage electrical wiring, cause mold formation or lead to other problems.

How often should I apply a chimney brick sealer?

It depends on how often you use your fireplace. If you have a gas log set, consider applying it twice per year (pre- and post-season). Fireplace fires should be treated once every two years, but if you burn wood for heating purposes annually, then reapply the product before winter.

What are the benefits of using a chimney brick sealer?

The benefits are twofold—first, it protects your home’s structure from water damage. Second, by protecting against water infiltration you can reduce the risk of mold formation and enjoy better indoor air quality.

How do I know if my bricks need a chimney brick sealer?

If you’re concerned about water damage, it’s always best to apply a fireplace and masonry cleaner annually. This will keep your bricks looking pristine while also removing any contaminants that may be present on the surface. If all the mortar joints look intact and there is no evidence of previous leaks or stains, then you likely don’t need a chimney brick sealer.

See also
Best Fire Pit Mat (Buyer’s Guide)

Where can I apply the product?

Start at the bottom and work your way up as this will prevent any of it from running down onto surfaces where it might cause damage to furniture or other items nearby.

What is the best type of fireplace brick sealer?

When selecting a fireplace brick sealer, look for one that is non-toxic and free of chemicals. As with all masonry cleaners, make sure the product you are using has been designed specifically to protect your bricks without damaging them or leaving behind any harmful substances.

Environmental Protection

The best chimney brick sealer on the market is environmentally safe. It will not damage the environment, and it does not release any chemicals into the air or water supply. The perfect brick sealant for your outdoor fireplace should be non-toxic, so that you can rest assured that your family’s health is protected when using this product.

Safety Tips

  • Keep your pets and children away from the area you are working on.
  • Be aware of any potential hazards in the area, such as power lines or flying debris.
  • If you are working on a roof, be aware of the weather conditions to avoid slipping or falling off.
  • Never use flammable liquids, such as gasoline or lighter fluid.
  • Read the instructions on all products thoroughly before beginning to seal your chimney bricks.
  • If you are using an aerosol can of sealant, make sure there is sufficient distance between yourself and what you are spraying (at least three feet).
  • Always use protective gloves to avoid getting the sealant on your skin.
  • If you are using a brush, make sure it is long enough to reach all of the surfaces that need sealing without making contact with the bricks themselves.
  • Start by applying an even coat over every surface that needs sealing. Allow time for each area to dry before moving on to the next step.
  • If using a sealant with multiple steps, make sure you are following all of the instructions in order.
  • You may need to apply several coats of sealer if your bricks are particularly porous or do not have an even appearance after one coat.
  • Make sure that the sealant you are using is compatible with the type of brick that your chimney is made from.
  • When applying a second coat, start in one section and work across it before moving to another area so as not to miss any spots or create uneven coverage.
  • Allow time for each layer of sealer to dry fully before applying the next one.
  • Make sure to use protective equipment, including goggles and gloves, to avoid getting sealer on your skin or in your eyes.
  • If you are working with a partner who is applying different products, make sure they keep an eye out for any hazardous conditions that may arise while you are focused elsewhere.
Chimney Brick Sealer, Clear Water-Based Siloxane Sealer - Breathable Waterproofer for All Exterior, Vertical Masonry Surfaces, 1 gal
  • CLEAR PROTECTION – Provides a long-lasting, non-glossy invisible coat to masonry surfaces. Will...
  • WATER SEALANT – Water-based, siloxane penetrating brick sealer that bonds with the minerals in...
  • POWERFUL CHIMNEY SEALER – Keep your chimney leak free and protect it or other masonry surfaces...
  • EASY TO APPLY – First step is to ensure your chimney or masonry surface is fully cleaned and clear...
  • 5 YEAR WARRANTY – MasonryDefender offers a 5 Year Limited Warranty on Vertical Masonry Surfaces

FAQs

What is a chimney brick sealer?

A chimney brick sealer, or a masonry protector in general, is a liquid that coats the inner surface of an object with either a matte or glossy film. The purpose of this coating is to protect it from staining and rusting. In case of masonry surfaces such as bricks, the liquid can also serve to seal in crevices and cracks, preventing water damage. Masonry surfaces are usually porous due to their rough texture, which is why they need special protection when used outdoors or somewhere where it may be exposed to rainwater. If not sealed properly, they will absorb moisture that leads later on to corrosion, mold, or other kinds of damage.

What are the best chimney brick sealers?

There is a wide range of options available on today’s market but you should know that not all masonry protector brands are created equal. Some products simply do not have enough quality to protect your surfaces from corrosion for an extended period of time. There are several things to consider when buying a chimney brick sealer, including the recoating interval (how quickly it needs to be reapplied), its durability, resistance against chemicals and other elements such as UV rays or rainwater.

What materials should I use for sealing my bricks?

Masonry surfaces can be made of a variety of materials, including concrete, bricks and stone. To prevent moisture from coming into contact with your brick surfaces you will need to use a chimney brick sealer that is capable of protecting it against water penetration such as the Perma-Chink EIFS SEALER. This solution can be applied over different types of surfaces including EIFS, stucco and foam insulation. It is also capable of sealing brick surfaces, which are not impervious to water.

What additional supplies do I need for the application process?

It depends on what type of chimney brick sealer you purchase but most solutions come with their own applicators that are specially designed for each task. If they don’t, make sure that you purchase the right kind of applicator because using a paintbrush or roller that is too big could result in messy application.

Where can I apply chimney brick sealer?

Ideally, masonry surfaces should be sealed before they are installed so this means if you are applying it to your home’s exterior walls then you need to do so before the brickwork is complete. Once you have applied a protective coating, your brick surfaces will be protected from corrosion and staining for many years without needing any additional treatment.

What are some alternatives to chimney brick sealer?

If you cannot afford purchasing a masonry protector then there are other options that can be used to protect and seal and brick surfaces. One of the most popular alternatives is a paintbrush, which can be dipped in acrylic or latex primer before being applied on your wall’s surface. Another option would be using an airless sprayer since it will provide even coverage across large areas such as walls with little effort from your end.

How long do I need to wait for the brick sealer to dry?

It will depend on what type of solution you use and its manufacturer’s instructions but generally it is recommended that you wait until your surface is no longer tacky or sticky before applying another layer of protection. If after 24 hours, there are still parts of brickwork that feel sticky, you can use a light sandpaper to rough up the area and then respray.

Do I need to put on more than one layer?

It depends on the type of chimney masonry sealer you purchase but most masonry protectors will not require multiple coats because they are made with a durable formula that can protect your surfaces for many years after the first application.

Conclusion

Now that you are aware of the types, properties and use cases of chimney bricks, it’s time to decide which one is right for your needs. Each type has its benefits and drawbacks, but ultimately it comes down to personal preference. You should know what questions to ask yourself before making a choice between clay or concrete blocks.