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In cold regions, water that soaks into brick freezes, expands and pops off the brick face, a process called spalling. The best brick sealer for freeze thaw climates reduces how much water gets in while still letting the brick dry out, which is why breathable penetrating sealers are the standard choice.
Salt from de-icing adds to the damage on steps, walks and low walls. We compared silane and siloxane sealers listed for salt and water repellency.
Quick Answer: The Best Brick Sealer for Freeze Thaw Climates
- Best Overall: Siloxane 9500 Ready-to-Use Silane/Siloxane Penetrating Sealer (1 gal)
- Best for Brick Walls: Prosoco Sure Klean Weather Seal Siloxane PD Water Repellent (1 gal)
- Best Widely Available: Drylok Siloxane 7 Brick & Masonry Penetrating Sealer (1 gal)
- Best Value Two-Pack: MasonryDefender Deep Penetrating Silane Siloxane Water Repellent (1 gal, 2-Pack)
- Best Crack Repair: Drylok Fast-Set Waterproof Masonry Crack Filler, Gray (10.5 oz)
- Best Sprayer: Chapin 25020 2-Gallon Clean ’N Seal Poly Deck Sprayer for Cleaners and Sealers
The Siloxane 9500 silane/siloxane blend is the best brick sealer for freeze thaw climates because it is listed as salt and water repellent; Prosoco Siloxane PD is the best for brick walls, and Drylok Siloxane 7 is a widely available traffic-rated option.
Best Brick Sealer for Freeze Thaw Climates Comparison Table
| Product | Best For | Type | Key Feature | Buy |
|---|---|---|---|---|
| Siloxane 9500 Ready-to-Use Silane/Siloxane Penetrating Sealer (1 gal) | Best Overall | Silane/siloxane penetrating sealer | DOT-approved per listing, salt and water repellent | Check Price |
| Prosoco Sure Klean Weather Seal Siloxane PD Water Repellent (1 gal) | Best for Brick Walls | Penetrating siloxane water repellent | Breathable, invisible water repellent | Check Price |
| Drylok Siloxane 7 Brick & Masonry Penetrating Sealer (1 gal) | Best Widely Available | Penetrating siloxane sealer | Penetrating, traffic-rated per listing | Check Price |
| MasonryDefender Deep Penetrating Silane Siloxane Water Repellent (1 gal, 2-Pack) | Best Value Two-Pack | Silane/siloxane penetrating sealer | Deep penetrating water repellent | Check Price |
| Drylok Fast-Set Waterproof Masonry Crack Filler, Gray (10.5 oz) | Best Crack Repair | Masonry crack filler | Seals cracks and mortar joints | Check Price |
| Chapin 25020 2-Gallon Clean ’N Seal Poly Deck Sprayer for Cleaners and Sealers | Best Sprayer | Pump sprayer | 2-gal sprayer made for sealers | Check Price |
The 6 Best Sealers for Freeze-Thaw Areas
Our picks for the best brick sealer for freeze thaw climates.
Siloxane 9500 Ready-to-Use Silane/Siloxane Penetrating Sealer (1 gal)
1A ready-to-use silane/siloxane penetrating sealer listed for pavers, brick and stone.
👍 Pros & Cons
Pros
- Silane/siloxane blend penetrates deep
- Salt and water repellent
- Listed coverage 150-400 sq ft per gallon
Cons
- Coverage varies with porosity
- No color enhancement
📄 Detailed Review
- Type: Silane/siloxane penetrating
- Finish: Natural look
- Base: Water-based, ready to use
- Best for: Pavers, driveways, brick, stone
Silane/siloxane blends penetrate dense and porous masonry, useful in freeze-thaw areas where salt and water cause spalling.
Apply until the surface is evenly wet, avoiding puddles.
Prosoco Sure Klean Weather Seal Siloxane PD Water Repellent (1 gal)
2Prosoco’s Siloxane PD is a professional penetrating water repellent for brick and masonry walls.
👍 Pros & Cons
Pros
- Pro brand used on brick facades
- Breathable, does not trap moisture
- Natural, non-glossy look
Cons
- Not a stain or color
- Needs dry, clean brick
📄 Detailed Review
- Type: Penetrating siloxane
- Finish: Invisible / natural look
- Base: Water-based
- Best for: Exterior brick and masonry walls
Penetrating siloxanes soak into masonry and make it shed water while still letting vapor escape, which is why they are favored for exterior brick and chimneys.
Apply to dry, clean brick and follow the label’s saturation directions.
Drylok Siloxane 7 Brick & Masonry Penetrating Sealer (1 gal)
3Drylok Siloxane 7 is a widely available penetrating sealer for brick and masonry, including traffic surfaces.
👍 Pros & Cons
Pros
- Trusted masonry waterproofing brand
- Listed for vehicle traffic
- Penetrating, breathable
Cons
- Goes on milky white
- Two coats may be needed on porous brick
📄 Detailed Review
- Type: Penetrating siloxane
- Finish: Clear when dry (goes on milky)
- Base: Water-based
- Best for: Brick, pavers, masonry
It goes on milky and dries clear. Penetrating formulas protect without the slippery film of acrylics.
Do a test patch to check the final look.
MasonryDefender Deep Penetrating Silane Siloxane Water Repellent (1 gal, 2-Pack)
4MasonryDefender’s silane siloxane is a deep penetrating water repellent sold in a two-gallon pack.
👍 Pros & Cons
Pros
- Deep penetrating formula
- Two gallons per order
- Breathable
Cons
- Two-pack is more than small jobs need
- Not for glossy look
📄 Detailed Review
- Type: Silane/siloxane penetrating
- Finish: Natural look
- Base: Water-based
- Best for: Concrete, brick, block
Good for larger walls, block and concrete where you want water beading without changing the look.
Spray with a low-pressure pump sprayer.
Drylok Fast-Set Waterproof Masonry Crack Filler, Gray (10.5 oz)
5Drylok’s fast-set crack filler seals cracks and failed joints before you apply a sealer.
👍 Pros & Cons
Pros
- Seals cracks before sealing
- Paintable in 1 hour per listing
- Indoor and outdoor
Cons
- Gray color shows on red brick
- Not structural
📄 Detailed Review
- Type: Masonry crack filler
- Finish: Gray
- Base: Cartridge
- Best for: Cracks before sealing
No sealer can bridge open cracks; fill them first.
Tool the joint to match surrounding mortar.
Chapin 25020 2-Gallon Clean ’N Seal Poly Deck Sprayer for Cleaners and Sealers
6Chapin’s Clean ’N Seal is built for applying cleaners and transparent sealers.
👍 Pros & Cons
Pros
- Designed for transparent sealers and cleaners
- Fan tip for even coats
- Poly tank resists corrosion
Cons
- Seals may not suit strong solvents
- Pumping needed
📄 Detailed Review
- Capacity: 2 gallons
- Tank: Poly
- Best for: Water-based sealers and cleaners
A low-pressure sprayer with a fan tip lays down even, flood-style coats of penetrating sealer.
Rinse thoroughly after each use.
How We Chose the Best Brick Sealer for Freeze Thaw Climates
To choose the best brick sealer for freeze thaw climates, we only included breathable penetrating sealers, then compared salt repellency claims, suitability for vertical and horizontal brick, and coverage.
Water moving through masonry can also cause damp indoors; see the EPA guide to mold and moisture.
Product details in this guide come from manufacturer specifications and patterns in verified owner feedback; we do not claim hands-on testing we have not done. Read more on our How We Test page.
Buying Guide: Best Brick Sealer for Freeze Thaw Climates
Tips for using the best brick sealer for freeze thaw climates.
Why brick spalls
Water inside brick freezes and expands, cracking off the face.
Breathable is critical
Film coatings trap moisture and make spalling worse. Use silane or siloxane.
Salt makes it worse
De-icing salt draws moisture and adds crystal pressure; salt-repellent sealers help.
Seal in fall
Apply on dry days before freezing weather, within the label’s temperature range.
Fix water sources
Leaky gutters and downspouts saturate brick; fix them first.
Already spalled brick
Replace badly spalled bricks; sealer will not restore them.
Freeze-Thaw Protection Plan
Protect brick before winter.
- Fix gutters and downspouts.
- Repoint failed joints.
- Seal on a dry fall day.
- Use sand or salt alternatives on brick steps.
Questions about the best brick sealer for freeze thaw climates:
Frequently Asked Questions
What is the best brick sealer for freeze thaw climates?
The best brick sealer for freeze thaw climates is a breathable silane/siloxane like the Siloxane 9500 blend or Prosoco Siloxane PD.
Does sealing prevent spalling?
It reduces water uptake, which reduces freeze-thaw damage.
Can sealer make spalling worse?
Film-forming sealers can; breathable sealers are designed not to.
When should I seal brick in cold climates?
On dry fall days before freezing weather.
Should I use salt on brick steps?
Salt accelerates damage; use sand or brick-safe alternatives.
Final Verdict
Our final pick for the best brick sealer for freeze thaw climates is the Siloxane 9500 Penetrating Sealer. Choose the Prosoco Siloxane PD if you want brick walls, or the Drylok Siloxane 7 for a widely available option.
Related Guides
More exterior brick guides:
- Best Faux Brick on Amazon
- Best Brick Dust Sealer
- Best Brick Sealer for Chimney
- Best Brick Sealer for Basement Walls
- Best Brick Sealer for a Kitchen Backsplash
Product details are based on manufacturer specifications at the time of writing. Prices and availability change often, so check Amazon for the latest price.
