---
product_id: 5175199
title: "Reflectix EXPO4050 Series 4\" x50' Expansion Joint, No Size, No Color"
brand: "reflectix"
price: "€ 60.97"
currency: EUR
in_stock: true
reviews_count: 8
category: "Reflectix"
url: https://www.desertcart.nl/products/5175199-reflectix-expo4050-series-4-x50-expansion-joint-no-size-no
store_origin: NL
region: Netherlands
---

# Waterproof foam material 4-inch expansion width 50-foot length for large projects Reflectix EXPO4050 Series 4" x50' Expansion Joint, No Size, No Color

**Brand:** reflectix
**Price:** € 60.97
**Availability:** ✅ In Stock

## Summary

> 🧱 Seal the gap, secure your space — expansion done right!

## Quick Answers

- **What is this?** Reflectix EXPO4050 Series 4" x50' Expansion Joint, No Size, No Color by reflectix
- **How much does it cost?** € 60.97 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nl](https://www.desertcart.nl/products/5175199-reflectix-expo4050-series-4-x50-expansion-joint-no-size-no)

## Best For

- reflectix enthusiasts

## Why This Product

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

## Key Features

- • **Extended Coverage:** 50 feet of durable foam ensures you’re ready for any project size.
- • **Trusted Brand Quality:** Reflectix reliability with a 4.4-star rating from 470+ pros.
- • **Waterproof Durability:** Built to withstand moisture, protecting your walls and surfaces.
- • **Effortless Installation:** Lightweight 1.1 lb foam that’s easy to handle and apply.
- • **Precision Expansion Control:** Seamlessly manage concrete joints with a reliable 4" width.

## Overview

The Reflectix EXPO4050 Series Expansion Joint is a 4-inch wide, 50-foot long waterproof foam designed for concrete control joints and wall surface repairs. Lightweight and easy to install, it offers durable protection and precise gap filling, trusted by professionals with a strong 4.4-star rating.

## Description

Reflectix EXPO4050 Series 4" x50' Expansion Joint, No Size, No Color

Review: Very good - It is easy to use. Work very well
Review: Expansion foam for concrete control joints - Wonderful price for. Quality product

## Features

- This Product Adds A Great Value
- Product Is Highly Durable And Easy To Use
- This Product Is Manufactured In China
- Brand Name: Reflectix

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B004WAPFS6 |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #101,878 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #305 in Wall Surface Repair Products |
| Brand | Reflectix |
| Brand Name | Reflectix |
| Color | Black |
| Customer Reviews | 4.4 4.4 out of 5 stars (470) |
| Date First Available | January 1, 2008 |
| Global Trade Identification Number | 00716511560017 |
| Included Components | Appliance Parts & Accessories |
| Is Discontinued By Manufacturer | No |
| Item Form | Foam |
| Item Weight | 1.1 pounds |
| Item model number | EXPO4050 |
| Manufacturer | REFLECTIX INC |
| Material | Plastic |
| Material Type | Plastic |
| Maximum Gap Fill | 50 Inches |
| Model Info | EXPO4050 |
| Number of Items | 1 |
| Part Number | EXPO4050 |
| Product Dimensions | 5.25 x 5.25 x 48.75 inches |
| Surface Recommendation | Walls |
| UPC | 716511560017 |
| Unit Count | 1.0 Count |
| Water Resistance Level | Waterproof |

## Product Details

- **Brand:** Reflectix
- **Color:** Black
- **Item Form:** Foam
- **Item Weight:** 1.1 Pounds
- **Maximum Gap Fill:** 50 Inches

## Images

![Reflectix EXPO4050 Series 4" x50' Expansion Joint, No Size, No Color - Image 1](https://m.media-amazon.com/images/I/616BNovop9L.jpg)

## Questions & Answers

**Q: I have weeds cmg up bw my concrete slabs on driveway, do I just put this into the concrete joint gaps and then apply sikaflex on top? beginner here**
A: I use this stuff between walls or bricks before the the pour. Then rip the perforated top off and fill with Urathane like sika. It allows movement of the slab and keeps things from breaking. If you have an existing joint, just buy the round foam and stuff it in leaving a space at the top. Be advised any self leveling compound will find even the smallest holes and all drain out. So if you don’t have a good deal use a little latex caulk then apply sika

**Q: is this product good to use between concrete pool and paver decking**
A: Yes, I used the Reflectix between a concrete wall and a paver driveway and it is working pretty well, I recommend to use a sealant(silicon)for outdoors at the top to prevent the dust cumulate in joints, the sealant should cover the joint with the pool, the top of the Reflectix and the joint with the paver decking. Hopefully it helps.

**Q: Could this be used for a concrete form?**
A: Not recommended, since it has limited strength and bends easily. I have used this around the edge of a sidewalk during resurfacing to prevent run off of cement and in some landscaping but not for any concrete forms.

**Q: Is this product UV resistant?**
A: If used correctly it is between two surfaces and not exposed to sunlight. It is made to go between a wall and a concrete sidewalk or as a filler in an expansion joint for example.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Very good
*by D***E on March 2, 2025*

It is easy to use. Work very well

### ⭐⭐⭐⭐⭐ Expansion foam for concrete control joints
*by W***S on August 23, 2025*

Wonderful price for. Quality product

### ⭐⭐⭐⭐ Great product but not perfect to refill current joint.
*by V***U on November 20, 2013*

This works great and easy to work with. The only issue with using this to replace rotten joint is that the gap between the concrete pads are usually slightly wider. If this product is about 3/16" or 1/4" thick, it will be perfect. It is easier to squeeze it in instead of leaving a gap in between. I end up have to cut a thin strip and squeeze near the top of the concrete gap to complete fill and secure this foam. I little be more work but it works. Let' see if it hold up.

## Frequently Bought Together

- Reflectix EXPO4050 Series 4" x50' Expansion Joint, No Size, No Color
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*Product available on Desertcart Netherlands*
*Store origin: NL*
*Last updated: 2026-02-18*