---
product_id: 14333542
title: "RadonSeal Plus Concrete Sealer – Deep Penetrating Waterproofing for Basement Floors, Foundation Walls & Concrete Block – Reduces Moisture & Strengthens Concrete (2.5 Gal)"
brand: "radonseal"
price: "$558.93"
currency: USD
in_stock: true
reviews_count: 8
category: "Radon Seal"
url: https://www.desertcart.us/products/14333542-radonseal-plus-concrete-sealer-deep-penetrating-waterproofing-for-basement-floors
store_origin: US
region: United States of America
---

# Penetrates 4 inches deep Strengthens & hardens concrete Long-lasting internal seal RadonSeal Plus Concrete Sealer – Deep Penetrating Waterproofing for Basement Floors, Foundation Walls & Concrete Block – Reduces Moisture & Strengthens Concrete (2.5 Gal)

**Brand:** radonseal
**Price:** $558.93
**Availability:** ✅ In Stock

## Summary

> 🛠️ Seal Deep, Live Dry: The Ultimate Concrete Armor for Your Home

## Quick Answers

- **What is this?** RadonSeal Plus Concrete Sealer – Deep Penetrating Waterproofing for Basement Floors, Foundation Walls & Concrete Block – Reduces Moisture & Strengthens Concrete (2.5 Gal) by radonseal
- **How much does it cost?** $558.93 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/14333542-radonseal-plus-concrete-sealer-deep-penetrating-waterproofing-for-basement-floors)

## Best For

- radonseal enthusiasts

## Why This Product

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

## Key Features

- • **Eco-Friendly & Safe DIY:** Water-based, zero VOCs, no fumes—apply indoors with confidence and ease.
- • **Invisible Yet Invincible:** No surface film or gloss—preserves concrete’s natural look while providing a permanent barrier.
- • **Concrete Reinforcement Power:** Chemically densifies and hardens concrete, reducing dusting and freeze-thaw damage.
- • **Deep Penetration, Maximum Protection:** Seals concrete pores up to 4 inches deep to block moisture and radon at the source.
- • **Versatile Basement & Foundation Shield:** Ideal for floors, walls, slabs, and blocks; compatible with paints and coatings for seamless finishing.

## Overview

RadonSeal Plus Concrete Sealer is a professional-grade, water-based formula that penetrates up to 4 inches into concrete to create a durable, invisible barrier against moisture, vapor, and radon gas. It strengthens and densifies concrete, preventing damage from salts and freeze-thaw cycles, while remaining breathable to maintain structural integrity. Easy to apply with no surface film, it’s perfect for basement floors, foundation walls, and slabs, offering long-lasting protection with zero VOCs and no harmful fumes.

## Description

Product description Choose the Right RadonSeal for Your Concrete RadonSeal Standard Best for newer poured concrete , including indoor surfaces under 20 years old and outdoor surfaces under 2 years old. Note: RadonSeal Standard may also be used on older concrete. RadonSeal PLUS Best for concrete block and older, more porous poured concrete , including indoor surfaces over 20 years old and outdoor surfaces over 2 years old. Note: RadonSeal Plus is a more highly concentrated formulation designed for more porous substrates, and can also be used on newer concrete. Protects Against Common Concrete Issues Moisture Concrete absorbs moisture from below, which coatings can trap. RadonSeal helps reduce moisture movement, creating improved conditions for finishes. Efflorescence Reducing moisture movement helps minimize efflorescence, which can damage paints, epoxy, and surface coatings. Cracking RadonSeal improves concrete surface strength, helping reduce cracking and surface deterioration. Dusting RadonSeal helps harden and bond the concrete surface, reducing dusting and fine surface residue. Easy Spray-On Application Apply using a plastic, low-pressure hand-pump sprayer. Easy Spray-On Application Apply using a plastic, low-pressure hand-pump sprayer. Sealed vs Unsealed Concrete RadonSeal absorbs into the concrete and reduces permeability from within, helping to limit capillary water seepage and moisture movement through the concrete. Sealed vs Unsealed Concrete RadonSeal absorbs into the concrete and reduces permeability from within, helping to limit capillary water seepage and moisture movement through the concrete. How Moisture Moves Through Concrete Moisture moves through concrete by capillary action, traveling through pores and capillaries in any direction. How Moisture Moves Through Concrete Moisture moves through concrete by capillary action, traveling through pores and capillaries in any direction. Strengthens the Surface RadonSeal hardens the concrete, reducing dusting, cracking, and surface deterioration. It is especially beneficial in cold climates where freeze-thaw cycles and deicing salts accelerate damage. Strengthens the Surface RadonSeal hardens the concrete, reducing dusting, cracking, and surface deterioration. It is especially beneficial in cold climates where freeze-thaw cycles and deicing salts accelerate damage. How is RadonSeal different from coatings or sealers? Unlike traditional coatings that sit on the surface and can peel or trap moisture, RadonSeal absrobs deep into the concrete and works below the surface. It does not form a film, allowing the concrete to remain breathable. How is RadonSeal different from coatings or sealers? Unlike traditional coatings that sit on the surface and can peel or trap moisture, RadonSeal absrobs deep into the concrete and works below the surface. It does not form a film, allowing the concrete to remain breathable. Can I apply paint, epoxy, or coatings over RadonSeal? Yes. When applied to a bare, porous surface, it absorbs into the concrete rather than forming a surface layer, allowing proper adhesion of paints, epoxy, levelers, and coatings. Can I apply paint, epoxy, or coatings over RadonSeal? Yes. When applied to a bare, porous surface, it absorbs into the concrete rather than forming a surface layer, allowing proper adhesion of paints, epoxy, levelers, and coatings. What is the coverage rate? • Poured Concrete: 175–225 sq. ft. per gallon • Concrete Block: 100–125 sq. ft. per gallon As a general guideline, a 1,000 sq. ft. poured concrete surface requires approximately 5 gallons. A 2.5-gallon container will cover about 500 sq. ft. What is the coverage rate? • Poured Concrete: 175–225 sq. ft. per gallon • Concrete Block: 100–125 sq. ft. per gallon As a general guideline, a 1,000 sq. ft. poured concrete surface requires approximately 5 gallons. A 2.5-gallon container will cover about 500 sq. ft. Will RadonSeal stop water leaks through cracks? RadonSeal is not designed to stop active leaks through cracks, joints, or seams. These areas should be repaired using appropriate products such as CrackWeld Floor Crack Repair Kit or RadonSeal DIY Foundation Crack Repair Kit. Will RadonSeal stop water leaks through cracks? RadonSeal is not designed to stop active leaks through cracks, joints, or seams. These areas should be repaired using appropriate products such as CrackWeld Floor Crack Repair Kit or RadonSeal DIY Foundation Crack Repair Kit. Can RadonSeal be applied to painted or sealed surfaces? No. RadonSeal must be absorbed through the surface to be effective. It should only be applied to clean, bare, and porous concrete. Can RadonSeal be applied to painted or sealed surfaces? No. RadonSeal must be absorbed through the surface to be effective. It should only be applied to clean, bare, and porous concrete.

Review: easy to use, significantly lowered both moisture and radon levels in just 30 days - We bought RadonSeal Plus to help reduce radon levels in our home and ensure proper moisture levels in the concrete floor before installing LVP in our partially finished basement. We were surprised to get moisture test readings in the yellow since, as long as we've lived here, our sump pump has remained bone dry and we've had zero visible signs of water intrusion. After several months of monitoring humidity, dewpoint, etc, we concluded water vapor must be wicking up through the concrete. We decided to apply RadonSeal Plus to only the finished room first, since we need the new LVP installed in time for Christmas gatherings. RadonSeal was easy to apply, had little to no odor, and we could see it was being absorbed effectively into the concrete as it was applied. The instructions say it reaches full strength in 60 to 90 days. After 30 days we're pretty happy with the results so far. Our moisture readings have gone from yellow to green with our latest ASTM F1869 test reading 2.14. Our radon readings have gone from regular highs from 10 to 14 over the 3 months prior to the application, to now showing consistent levels between 4 to 6. This is after doing 1/3 of the basement (ONLY the finished area). After the holidays we'll seal the two unfinished areas of the basement and I'll be happy to report the final results here.
Review: Definitely saw lower radon numbers. - Had two rooms downstairs that were not finished just bare concrete. Sprayed all the walls that were in contact with the Earth and sprayed the floors. We already had a radon monitor for years so we knew what the averages were. Our numbers were never high enough to trigger remediation, but it is peace of mind, knowing that they’re even lower now. This definitely brought the radon levels down in conjunction with caulking all cracks first in the floors with radon approved caulk. My recommendation is to do light coats with a pump sprayer. Don’t let the liquid pool. This is not a substitute for homes that have radon levels high enough to require remediation.

## Features

- DEEP-PENETRATING CONCRETE SEALER – RadonSeal Plus penetrates deep into concrete and reacts within the pore structure to seal capillaries, helping reduce water intrusion and moisture vapor transmission through basement floors and foundation walls.
- FOR BASEMENTS & FOUNDATIONS – Helps reduce moisture seepage through concrete floors and walls by penetrating and reacting within the concrete. Ideal for basement floors, foundation walls, slabs, and concrete block exposed to ground moisture.
- LONG-LASTING INTERNAL SEAL – Unlike acrylic or epoxy coatings that sit on the surface, RadonSeal reacts inside the concrete to form a durable internal seal that will not peel, blister, or wear away over time.
- STRENGTHENS & HARDENS CONCRETE – Chemically densifies and reinforces porous or weak concrete, reducing dusting and improving resistance to water intrusion, salts, and freeze-thaw cycles.
- EASY DIY APPLICATION – Apply with a sprayer, roller, or brush. The water-based formula penetrates deeply into the concrete where it reacts and cures internally—no surface coating or film.
- PAINTABLE & COATING-COMPATIBLE – Prepares concrete surfaces for coatings by helping reduce moisture movement through the substrate. Compatible with concrete paints, epoxy coatings, clear sealers, overlays, and adhesives.
- IDEAL FOR BASEMENTS & FOUNDATIONS – Suitable for basement floors, foundation walls, concrete slabs, garages, and warehouses. Works on poured concrete and concrete block (CMU) foundations.
- COVERS UP TO ~500 SQ FT PER 2.5 GALLONS – Coverage varies depending on concrete porosity. Suitable for basement floors, foundation walls, slabs, and concrete block to help reduce moisture vapor transmission.
- NATURAL, INVISIBLE FINISH – Does not change the appearance of concrete. No gloss, no darkening, and no surface film.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00ITZ9VNU |
| Best Sellers Rank | #204,998 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #645 in Hardware Sealers |
| Brand | RadonSeal |
| Brand Name | RadonSeal |
| Color | Clear |
| Compatible Material | Concrete |
| Customer Reviews | 4.2 out of 5 stars 129 Reviews |
| Included Components | 1 |
| Item Dimensions | 10 x 24 x 10 inches |
| Item Form | Liquid |
| Item Weight | 24 Pounds |
| Item dimensions L x W x H | 10 x 24 x 10 inches |
| Manufacturer | Novion |
| Material | Blended Silicate |
| Material Type | Blended Silicate |
| Model | 111 |
| Number of Items | 1 |
| Part Number | 111 |
| Style | PLUS |
| Style Name | PLUS |
| Surface Recommendation | Floors,Walls |
| UPC | 856255006034 |
| Unit Count | 320.0 Fluid Ounces |
| Water Resistance Level | Waterproof |

## Product Details

- **Brand:** RadonSeal
- **Item Weight:** 24 Pounds
- **Item dimensions L x W x H:** 10 x 24 x 10 inches
- **Material:** Blended Silicate
- **Style:** PLUS

## Images

![RadonSeal Plus Concrete Sealer – Deep Penetrating Waterproofing for Basement Floors, Foundation Walls & Concrete Block – Reduces Moisture & Strengthens Concrete (2.5 Gal) - Image 1](https://m.media-amazon.com/images/I/71C7EgA98uL.jpg)
![RadonSeal Plus Concrete Sealer – Deep Penetrating Waterproofing for Basement Floors, Foundation Walls & Concrete Block – Reduces Moisture & Strengthens Concrete (2.5 Gal) - Image 2](https://m.media-amazon.com/images/I/61iHuujJRtL.jpg)
![RadonSeal Plus Concrete Sealer – Deep Penetrating Waterproofing for Basement Floors, Foundation Walls & Concrete Block – Reduces Moisture & Strengthens Concrete (2.5 Gal) - Image 3](https://m.media-amazon.com/images/I/71S5fMSp36L.jpg)
![RadonSeal Plus Concrete Sealer – Deep Penetrating Waterproofing for Basement Floors, Foundation Walls & Concrete Block – Reduces Moisture & Strengthens Concrete (2.5 Gal) - Image 4](https://m.media-amazon.com/images/I/71XPIcXXl1L.jpg)
![RadonSeal Plus Concrete Sealer – Deep Penetrating Waterproofing for Basement Floors, Foundation Walls & Concrete Block – Reduces Moisture & Strengthens Concrete (2.5 Gal) - Image 5](https://m.media-amazon.com/images/I/713DheGmkYL.jpg)

## Questions & Answers

**Q: How is RadonSeal different from coatings or sealers?**
A: Unlike traditional coatings that sit on the surface and can peel or trap moisture, RadonSeal absrobs deep into the concrete and works below the surface. It does not form a film, allowing the concrete to remain breathable.

**Q: Can I apply paint, epoxy, or coatings over RadonSeal?**
A: Yes. When applied to a bare, porous surface, it absorbs into the concrete rather than forming a surface layer, allowing proper adhesion of paints, epoxy, levelers, and coatings.

**Q: What is the coverage rate?**
A: • Poured Concrete: 175–225 sq. ft. per gallon • Concrete Block: 100–125 sq. ft. per gallon As a general guideline, a 1,000 sq. ft. poured concrete surface requires approximately 5 gallons. A 2.5-gallon container will cover about 500 sq. ft.

**Q: Will RadonSeal stop water leaks through cracks?**
A: RadonSeal is not designed to stop active leaks through cracks, joints, or seams. These areas should be repaired using appropriate products such as CrackWeld Floor Crack Repair Kit or RadonSeal DIY Foundation Crack Repair Kit.

**Q: Can RadonSeal be applied to painted or sealed surfaces?**
A: No. RadonSeal must be absorbed through the surface to be effective. It should only be applied to clean, bare, and porous concrete.

## Customer Reviews

### ⭐⭐⭐⭐⭐ easy to use, significantly lowered both moisture and radon levels in just 30 days
*by 2***M on December 10, 2024*

We bought RadonSeal Plus to help reduce radon levels in our home and ensure proper moisture levels in the concrete floor before installing LVP in our partially finished basement. We were surprised to get moisture test readings in the yellow since, as long as we've lived here, our sump pump has remained bone dry and we've had zero visible signs of water intrusion. After several months of monitoring humidity, dewpoint, etc, we concluded water vapor must be wicking up through the concrete. We decided to apply RadonSeal Plus to only the finished room first, since we need the new LVP installed in time for Christmas gatherings. RadonSeal was easy to apply, had little to no odor, and we could see it was being absorbed effectively into the concrete as it was applied. The instructions say it reaches full strength in 60 to 90 days. After 30 days we're pretty happy with the results so far. Our moisture readings have gone from yellow to green with our latest ASTM F1869 test reading 2.14. Our radon readings have gone from regular highs from 10 to 14 over the 3 months prior to the application, to now showing consistent levels between 4 to 6. This is after doing 1/3 of the basement (ONLY the finished area). After the holidays we'll seal the two unfinished areas of the basement and I'll be happy to report the final results here.

### ⭐⭐⭐⭐⭐ Definitely saw lower radon numbers.
*by A***N on January 1, 2026*

Had two rooms downstairs that were not finished just bare concrete. Sprayed all the walls that were in contact with the Earth and sprayed the floors. We already had a radon monitor for years so we knew what the averages were. Our numbers were never high enough to trigger remediation, but it is peace of mind, knowing that they’re even lower now. This definitely brought the radon levels down in conjunction with caulking all cracks first in the floors with radon approved caulk. My recommendation is to do light coats with a pump sprayer. Don’t let the liquid pool. This is not a substitute for homes that have radon levels high enough to require remediation.

### ⭐⭐⭐⭐⭐ Very easy to apply. No odor.
*by J***J on September 3, 2023*

I poured it out of the 2 gal container in various areas spreading with a broom on a 43 year old cement basement floor after hand scrubbing first 2 days before. It soaked in well and the reapply 40 min later also did well. Then I took a damp flat mop another 40 min later to get up any still wet areas. No smell at all. I won't know until I finish the total basement floor and test for radon if it helps. It did give a low sheen and I can see that the surface is sealed.

## Frequently Bought Together

- RadonSeal Deep Penetrating Concrete Sealer for Basement Walls and Floors, Seals Concrete Against Water, Vapor and Radon Gas, (2.5 Gallons)
- Chapin 20000 Made in USA 1 -Gallon Lawn and Garden Pump Pressured Sprayer, for Spraying Plants, Garden Watering, Weeds and Pests, Polypropylene, Translucent White
- RadonSeal Efflorescence Remover - Cleans Efflorescence, Mortar Haze, Lime, and Rust Stains

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-05-16*