---
product_id: 23752537
title: "RadonSeal DIY Foundation Crack Repair Kit (20 ft) Low-Viscosity Urethane Injection Sealant for Crawl Spaces & Concrete Basement Walls - Stops Water Leaks - Drill-Free Filler"
brand: "radonseal"
price: "€ 570.89"
currency: EUR
in_stock: true
reviews_count: 8
category: "Radon Seal"
url: https://www.desertcart.hr/products/23752537-radonseal-diy-foundation-crack-repair-kit-20-ft-low-viscosity
store_origin: HR
region: Croatia
---

# Waterproof & permanent seal Expands 20x volume on contact with water Drill-free low-pressure injection RadonSeal DIY Foundation Crack Repair Kit (20 ft) Low-Viscosity Urethane Injection Sealant for Crawl Spaces & Concrete Basement Walls - Stops Water Leaks - Drill-Free Filler

**Brand:** radonseal
**Price:** € 570.89
**Availability:** ✅ In Stock

## Summary

> 🔧 Seal it once, seal it right — protect your foundation like a pro!

## Quick Answers

- **What is this?** RadonSeal DIY Foundation Crack Repair Kit (20 ft) Low-Viscosity Urethane Injection Sealant for Crawl Spaces & Concrete Basement Walls - Stops Water Leaks - Drill-Free Filler by radonseal
- **How much does it cost?** € 570.89 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/23752537-radonseal-diy-foundation-crack-repair-kit-20-ft-low-viscosity)

## 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

- • **Effortless DIY Repair:** No drilling or special tools needed—just a standard caulking gun to seal cracks like a pro.
- • **Flexible & Durable Seal:** Hydrophobic foam adapts to foundation movement without breaking down, ensuring long-lasting results.
- • **Precision Crack Coverage:** Low-viscosity formula penetrates even hairline cracks up to 0.5 inches wide.
- • **Cost-Saving Home Protection:** Avoid expensive contractors by sealing foundation cracks yourself and safeguard your basement.
- • **Permanent Waterproof Barrier:** Two-component polyurethane expands to fill cracks, stopping water leaks for good.

## Overview

RadonSeal DIY Foundation Crack Repair Kit offers a professional-grade, drill-free solution using expanding two-component polyurethane to permanently seal hairline to 0.5-inch cracks in poured concrete basement walls. Designed for easy application with a standard caulking gun, it creates a flexible, waterproof barrier that prevents water seepage and foundation damage, saving homeowners costly repairs while delivering contractor-level results.

## Description

Product description RadonSeal DIY Foundation Wall Crack Repair Repair ‘em Like the Pros Hiring a contractor to fix a leaky foundation crack can be costly, but RadonSeal DIY Foundation Crack Repair Kits provide an easy, affordable solution. The low-pressure polyurethane injection expands to fill the entire crack, blocking groundwater leaks from the backside. No special skills are needed, just use a standard caulking gun and some patience. Made with the same professional-grade, two-component polyurethane used by contractors, these kits ensure a flexible, waterproof repair that lasts. Once sealed, groundwater won’t find its way back. Complete Kit for a Seamless Repair The kits ship fully equipped with all the necessary materials to seal up to 10 feet of cracks in poured concrete walls, ensuring a hassle-free, professional-quality repair. Use a Standard Caulk Gun No special tools are needed to apply the material, just a standard caulking gun to inject the polyurethane foam and seal the crack effectively. Need to Repair More Than 10 Feet? We offer kits in both 10-foot and 20-foot sizes, ensuring you have the right amount of material for your repair. Note: Single cartridges are sold separately. Do It Right. Do It Yourself. Repairing cracks in poured concrete foundation basement walls has never been easier with RadonSeal DIY Foundation Wall Crack Repair Kits. Designed for homeowners, these kits use the same professional-grade, two-component polyurethane trusted by waterproofing contractors. Easily seal basement wall cracks yourself and prevent water leaks, saving you hundreds on foundation crack repair compared to hiring a contractor. Flexibility Matters Many crack repair kits use single-component, hydrophilic foams that absorb moisture and deteriorate over time. RadonSeal DIY Foundation Wall Crack Repair Kits provide a superior, long-lasting solution with a hydrophobic, two-component polyurethane designed specifically for sealing cracks in poured concrete walls. Upon contact with water, the polyurethane expands up to 20 times its volume, ensuring a watertight, flexible seal throughout the crack. This flexibility allows it to withstand foundation movement without breaking down, making it an ideal choice for permanently sealing basement wall cracks and preventing water leaks. Foundation Crack Repair Made Easy Why pay for expensive professional repairs when you can permanently seal foundation cracks yourself? RadonSeal Foundation Crack Repair Kits are designed for easy, do-it-yourself application, requiring no special skills or experience. With clear, step-by-step instructions, all you need is a little patience and a couple of hours to seal cracks in poured concrete walls like a pro. Plus, if you ever need assistance, our team of experts is ready to guide you through the repair process. Stop water leaks, prevent further damage, and protect your home’s foundation. Protect Your Home – Repair Basement Foundation Cracks Before They Worsen Waterproofing Sealing basement wall cracks is key to protecting your home from water damage. Over time, cracks allow water to seep into your basement, causing moisture buildup, flooding, and potential structural issues. By sealing these cracks, you create a waterproof barrier that keeps your basement dry and preserves the integrity of your home. Basement Crack Sealing Sealing basement wall cracks is an essential step in protecting your home from the harmful effects of moisture and soil intrusion. Cracks in your foundation can serve as entry points for water, which can seep into your basement. Proper crack sealing helps block these pathways while also improving the overall energy efficiency of your basement. Protects Flooring Sealing basement wall cracks helps protect flooring by preventing water intrusion at its source. When cracks are left unsealed, groundwater can seep through the walls, travel along the cove joint, or spread beneath flooring materials, leading to moisture damage, warping, and adhesive failure. I have a horizontal crack. Can I still use the kit? Most settling cracks are typically vertical or diagonal, which our kits are designed to repair. However, horizontal cracks in basement walls can be structural in nature and may require expert evaluation. For horizontal cracks, we recommend consulting an experienced contractor to assess the issue and determine the appropriate repair method. Therefore, we do not recommend using our kits for horizontal cracks without professional guidance. Can I use these kits for repairing cracks in concrete block walls? Our kits are specifically designed for repairing cracks in poured concrete walls. For cracks in hollow-core block foundation walls and mortar joints, we recommend our ElastiPoxy Joint & Crack Filler Kit . This two-component epoxy can be mixed with sand to create a strong, durable filler that effectively bonds and reinforces cracks in block foundations. Can the kits be used for sealing slab and floor cracks? Our kits are specifically designed for repairing cracks in poured concrete walls and are not recommended for slab or floor cracks. For sealing and structurally bonding cracks in concrete floors, we recommend using our CrackWeld Concrete Floor Crack Repair Kit . Is it possible that I may not have enough material to fill 10 feet of cracks? Each kit includes all necessary components to cover the specified coverage area. However, in some cases, additional urethane may be required to complete the job. Factors such as loose soil, voids behind the wall, wider-than-expected cracks, or cracks extending down to the footing can consume more urethane than anticipated. If more urethane is needed, individual cartridges—along with a new hose assembly, restrictor, and mixing nozzle—can be purchased separately. I was only able to repair half the crack. Can I continue filling it later? Yes, if you're unable to complete the injection process in one session, you can resume at a later time. The urethane is designed to bond to itself, ensuring a strong and continuous seal even if the application is paused. Can the kits be used for sealing corner cracks? Yes, the kits can be used to repair corner cracks. The injection ports are designed with a scored base, allowing them to be carefully bent for a better fit in tight corners. When placing the ports along a corner crack, hold them in place for a few extra moments to ensure the surface adhesive properly secures them. Can I repair the crack if it is actively leaking water? No, actively leaking water can interfere with the adhesion of the surface seal and the effectiveness of the injection process. Before proceeding, wait for the water flow to subside.

Review: Relatively easy, permanent fix - This is a great product. If you’re reasonably handy you can DIY it. I repaired two cracks and the results are perfect. No more leaks after heavy rains, freeze/thaw cycles and melting snow. Some tips that helped me: read the instructions several times and watch videos. Then read the instructions and watch more videos. Seriously. This is a permanent fix. Get it right the first time or you could create a permanent mess. Mix the epoxy in small batches. It sets up quick. It also stinks until it cures, so use ventilation. If the crack goes all the way through the foundation to the outside, cover the crack on the outside (above ground) with epoxy or hydraulic cement. This will prevent the polyurethane from leaking out and making a mess. Inject water into all the ports before you start injecting the polyurethane. This ensures the ports are open and the crack is contiguous, and provides water for the polyurethane to react with. Place the pinch valve close to the end of the hose (close to where it connects with the port on the wall). This cuts down on leaks and messes when you change ports. Inject the resin SLOWLY. It doesn't set up real fast, you have time. Watch the next port carefully while injecting. You may see water getting pushed out, or the resin filling the crack before it starts leaking out. Don't place the last port at the very top of the crack and don't completely cover the top of the crack. The resin needs some room to expand. I was surprised that this was something you could DIY. Much cheaper to do it this way and you get a permanent fix. The kit has everything you need. If you need more materials, like an extra tube of resin, you can buy those separately as needed.
Review: Awesome Stuff! - This product works amazing and the materials are very high end. I do have to say I am a pretty handy do it yourselfer and this was a time consuming moderately difficult task. I learned why the pros charge so much! My project was a big task however so I bought (1) 20 ft kit and (1) 10ft kit. I had 30 feet of crack to cover with vertical and horizontal cracks on an old foundation with previous old attempts to repair. Watch the youtube video and read the instructions carefully. The mixed epoxy sets up in like 5 – 10 minutes so mix small amounts. Also the epoxy stinks. One of the jars smelled like sulfur so if you are sensitive you will want to wear a p100 or better mask. I had a window open with a fan blowing out so I had fresh air flowing. The kit does come with safety glasses and 2 pairs of gloves but I wore a more comfortable pair of safety glasses and working with the product I did get splash on them. Also have extra pairs of gloves and mixing trays ready and take the time to make sure your epoxy is spread perfect. I had everything on a covered table ready to go in sequence so I could be efficient. When filling the ports with foam - Pin holes would make the foam come out and it made it more time consuming to make sure I got the crack filled. The foam tube does seem to stop about 3/4 of the way in so it doesn't finish a tube like a caulking tube normally would. I still had enough for my project though. Clean up was easy but the epoxy breaks into sharp shards when removing the ports so have a vacuum ready and wear your safety equipment!

## Features

- NO DRILLING REQUIRED – The low-pressure injection method eliminates the need for drilling.
- HAIRLINE CRACKS – Low viscosity urethane is suitable even for the repair of hairline cracks.
- NO NEED TO EXCAVATE – Save serious money by repairing the crack from the inside.
- NO SPECIAL TOOLS REQUIRED – Use a standard caulking gun to inject.
- PERMANENT - Prevents water seepage permanently.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00II7JOHM |
| Best Sellers Rank | #137,364 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #412 in Wall Surface Repair Products |
| Brand | RadonSeal |
| Brand Name | RadonSeal |
| Color | Grey |
| Customer Reviews | 4.5 out of 5 stars 187 Reviews |
| Full Cure Time | 24 Hours |
| Included Components | Surface Sealer, Injection Foam, Ports, Accessories |
| Item Form | Expanding CLosed-Cell Foam |
| Manufacturer | Novion |
| Material Type | Polyurethane |
| Maximum Gap Fill | 0.5 Inches |
| Model | 303 |
| Number of Items | 1 |
| Part Number | 303 |
| Surface Recommendation | Poured Concrete Walls, Leaking Form Ties, Cove Joints |
| UPC | 856255006607 |
| Unit Count | 1.0 Count |
| Water Resistance Level | Waterproof |

## Product Details

- **Brand:** RadonSeal
- **Color:** Grey
- **Full Cure Time:** 24 Hours
- **Item Form:** Expanding CLosed-Cell Foam
- **Maximum Gap Fill:** 0.5 Inches

## Images

![RadonSeal DIY Foundation Crack Repair Kit (20 ft) Low-Viscosity Urethane Injection Sealant for Crawl Spaces & Concrete Basement Walls - Stops Water Leaks - Drill-Free Filler - Image 1](https://m.media-amazon.com/images/I/81hTwgRHm0L.jpg)

## Questions & Answers

**Q: How many ports are included in this 20 foot kit?**
A: 30 ports

**Q: Can this product be used to repair wider cracks occurring in stem walls of raised foundations?**
A: We recommend that homeowners only use the kits on cracks up to 1/2" wide. Anything wider we would recommend you contact us first for consultation or hire a crack repair specialist.

**Q: Can you apply product on a wall that is actively leaking**
A: No. If the crack is actively leaking water, you must wait for it to subside before beginning urethane injection.

**Q: Does kit come with both corner and flat ports?**
A: The kit include only flat surface ports. If you need a kit with corner ports, please contact us directly.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Relatively easy, permanent fix
*by B***F on October 23, 2024*

This is a great product. If you’re reasonably handy you can DIY it. I repaired two cracks and the results are perfect. No more leaks after heavy rains, freeze/thaw cycles and melting snow. Some tips that helped me: read the instructions several times and watch videos. Then read the instructions and watch more videos. Seriously. This is a permanent fix. Get it right the first time or you could create a permanent mess. Mix the epoxy in small batches. It sets up quick. It also stinks until it cures, so use ventilation. If the crack goes all the way through the foundation to the outside, cover the crack on the outside (above ground) with epoxy or hydraulic cement. This will prevent the polyurethane from leaking out and making a mess. Inject water into all the ports before you start injecting the polyurethane. This ensures the ports are open and the crack is contiguous, and provides water for the polyurethane to react with. Place the pinch valve close to the end of the hose (close to where it connects with the port on the wall). This cuts down on leaks and messes when you change ports. Inject the resin SLOWLY. It doesn't set up real fast, you have time. Watch the next port carefully while injecting. You may see water getting pushed out, or the resin filling the crack before it starts leaking out. Don't place the last port at the very top of the crack and don't completely cover the top of the crack. The resin needs some room to expand. I was surprised that this was something you could DIY. Much cheaper to do it this way and you get a permanent fix. The kit has everything you need. If you need more materials, like an extra tube of resin, you can buy those separately as needed.

### ⭐⭐⭐⭐⭐ Awesome Stuff!
*by T***M on February 24, 2020*

This product works amazing and the materials are very high end. I do have to say I am a pretty handy do it yourselfer and this was a time consuming moderately difficult task. I learned why the pros charge so much! My project was a big task however so I bought (1) 20 ft kit and (1) 10ft kit. I had 30 feet of crack to cover with vertical and horizontal cracks on an old foundation with previous old attempts to repair. Watch the youtube video and read the instructions carefully. The mixed epoxy sets up in like 5 – 10 minutes so mix small amounts. Also the epoxy stinks. One of the jars smelled like sulfur so if you are sensitive you will want to wear a p100 or better mask. I had a window open with a fan blowing out so I had fresh air flowing. The kit does come with safety glasses and 2 pairs of gloves but I wore a more comfortable pair of safety glasses and working with the product I did get splash on them. Also have extra pairs of gloves and mixing trays ready and take the time to make sure your epoxy is spread perfect. I had everything on a covered table ready to go in sequence so I could be efficient. When filling the ports with foam - Pin holes would make the foam come out and it made it more time consuming to make sure I got the crack filled. The foam tube does seem to stop about 3/4 of the way in so it doesn't finish a tube like a caulking tube normally would. I still had enough for my project though. Clean up was easy but the epoxy breaks into sharp shards when removing the ports so have a vacuum ready and wear your safety equipment!

### ⭐⭐⭐⭐⭐ First time user, ordered double-kit for 2 cracks, Radonseal rocks!
*by R***G on March 29, 2024*

I order the double kit in order to repair 2 separate cracks. Need: - Radonseal Kit - Plastic drop cloth - At least 10 mixing sticks (HD paint department has 6 in. wooden Paint Stick for 1 qt. (30-Pack)) - Roll of paper towels - Wire brush on Makita drill (or manual wirebrush is fine also, comes with Radonseal kit) - Old rags - Pencils - Bucket of hot water to warm up injection foam (20 min prior to injection) - Stack of Paper Plates (for mixing Epoxy, 3 mixes per plate) - Garden sprayer (to flush ports with water) - Box of gloves (always wear 2 sets at a time, keep bottom layer and switch top layer) - Mask - Goggles (comes with Radonseal kit) - A few old towels Preparation: - Check for caulk tube fitment in your caulking gun before opening tube - Tubes will only compress half its length, due to having 2 chambers - Measure and Mark with Pencil port placement areas (6" apart, not 8") - A dollop is roughly a 5/8" round blob - Use paper plates for mixing - about 3 triangular mixing areas around each plate - Spread plastic under crack work areas Epoxy Steps (the more difficult and tedious of the tasks): - Use separate sticks for A and B Epoxy containers when scooping a dollop on paper plate - Use 3rd stick to mix the A and B dollops together, then also use this stick to apply Epoxy. - Be thorough when putting Exoxy around the port rims (but not in center) - Work quickly to put the Epoxy around the port rim - After pressing a port to the premarked wall, smooth out excess around outside of rim with same mixing stick. - Use up rest of 2-dollop mixture for next port(s). I backbuttered the rim of around 3 ports per 2-dollop mixture. - Always work from lower ports to upper - After placing ports, start from bottom when covering the crack with Epoxy. You don't want to go too wide with crack coverage, you have to judge how much of A and B mixture to use up, relative to the length of the entire crack. - When covering cracks between and around ports, you can scoop slightly bigger dollops - try to evenly scoop the same amount of A and B. - Don't force Epoxy into crack, just paste it over surface and around outside of ports Irrigation Steps (easiest of the tasks): - Have old towels positioned under the lowest port of crack(s) - Wait until Epoxy is fingernail-hard before irrigating - TIP: I used a drill bit smaller than the port diameter to check each port to ensure that there was no buildup of epoxy blocking the center of the port to the wall. You can tell when the drill bit is hitting the cement wall based on depth and also feel of hitting cement versus epoxy. - Using garden sprayer with water, put water into topmost port and confirm that it comes out of all the lower ports. - TIP: Use the port stoppers once water comes out to ensure all ports have water coverage - The idea here is to ensure the crack is wet and that in general most or all of the ports are showing they can leak out water (if water passes through the ports, the resin will also pass through the ports). Resin Steps (the more fun of the tasks, but is also a bit messy - double gloves again): - You should be heating up resin tubes in warm/hot water 20 minutes before dispensing. - Ensure you don't lose the "restrictors" when you open the plastic bag for the tubes. - Put tube into caulking gun before taking off the blue cap and stopper (it may be easier to attach the restrictor and host after the tube is in the gun). - Add restrictor to top of tube, then screw on hose and mixing tip. - Wide end of flexible hose goes over caulking gun tip, smaller end over ports - Use the same flexible hose when switching resin tubes to save the resin in the hose. - Go easy on caulking gun trigger, slowly dispense resin, pausing at times (while foam seeps and expands a bit) - TIP: You can see your dispensing rate (should be slow) by watching the tiny air bubbles flowing through the hose. - Continue dispensing into a port until it oozes out of next higher port, then switch to that port and put a stopper on port just completed. - Repeat until all resin is dispensed from bottom port to topmost port and you can see resin coming out the top of the crack. The foam will keep expanding, even for days after the repair. I found that even with a drenching 2" rainfall a mere 12 hours after repairing both cracks the product still worked flawlessly!

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.hr/products/23752537-radonseal-diy-foundation-crack-repair-kit-20-ft-low-viscosity](https://www.desertcart.hr/products/23752537-radonseal-diy-foundation-crack-repair-kit-20-ft-low-viscosity)

---

*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-07-05*