--- product_id: 5175199 title: "EXPO4050 Series 4\" x50' Expansion Joint, No Size, No Color" brand: "reflectix" price: "Β₯21654" currency: JPY in_stock: true category: "Reflectix" url: https://www.desertcart.jp/products/5175199-expo4050-series-4-x50-expansion-joint-no-size-no-color store_origin: JP region: Japan --- # Waterproof design for lasting durability 4-inch width for precise gap filling 50-foot length covers extensive expansion needs EXPO4050 Series 4" x50' Expansion Joint, No Size, No Color **Brand:** reflectix **Price:** Β₯21654 **Availability:** βœ… In Stock ## Summary > πŸ› οΈ Seal the deal with Reflectix – where durability meets precision! ## Quick Answers - **What is this?** EXPO4050 Series 4" x50' Expansion Joint, No Size, No Color by reflectix - **How much does it cost?** Β₯21654 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/5175199-expo4050-series-4-x50-expansion-joint-no-size-no-color) ## 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 - β€’ **Built to Last:** Waterproof plastic foam resists wear and environmental damage - β€’ **Extended Reach:** 50 feet of material to handle large-scale projects without interruption - β€’ **Trusted Brand Quality:** Reflectix reliability backed by 501 positive reviews and top rankings - β€’ **Effortless Installation:** Lightweight 1.1-pound roll designed for quick, hassle-free application - β€’ **Precision Fit for Every Gap:** 4-inch width ensures seamless expansion joint coverage ## Overview The Reflectix EXPO4050 Series Expansion Joint is a 4-inch wide, 50-foot long waterproof foam strip designed for wall surface repairs and insulation projects. Lightweight and easy to install, it offers durable gap filling with trusted Reflectix quality, making it a top choice for professionals seeking reliable expansion joint solutions. ## Description Reflectix EXPO4050 Series 4" x50' Expansion Joint, No Size, No Color ## 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 | | Best Sellers Rank | #37,434 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #158 in Wall Surface Repair Products | | Brand | Reflectix | | Brand Name | Reflectix | | Color | Brown | | Customer Reviews | 4.3 out of 5 stars 501 Reviews | | Global Trade Identification Number | 00716511560017 | | Included Components | Appliance Parts & Accessories | | Item Form | Foam | | Item Type Name | 4"x50' Expansion Joint | | Item Weight | 1.1 pounds | | Manufacturer | REFLECTIX INC | | Material Type | Plastic | | Maximum Gap Fill | 50 inches | | Model | EXPO4050 | | Number of Items | 1 | | Number of Packs | 10 | | Part Number | EXPO4050 | | Surface Recommendation | Walls | | UPC | 716511560017 | | Unit Count | 1 Count | | Warranty Description | As labelled | | Water Resistance Level | Waterproof | ## Product Details - **Brand:** Reflectix - **Color:** Black - **Item Form:** Foam - **Item Weight:** 1.1 Pounds - **Maximum Gap Fill:** 50 Inches ## Images ![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. ## Frequently Bought Together - Reflectix EXPO4050 Series 4" x50' Expansion Joint, No Size, No Color - Concrete Tools Set 3 PC Stainless Steel Flat Finishing Trowel (11" x 4") plus Concrete Edger (6" x 3", 1/2"R) and Groover (6" x 3", 1/2"W,1/2"D) Stucco Cement Kit Masonry Construction Hand Kit - MARSHALLTOWN Round End Magnesium Hand Float, 16 Inch x 3-1/8 Inch, Standard DuraSoft Handle, Eliminates Float Marks, Provides Smooth Finish, Made in the USA, Concrete Float, 143D --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.jp/products/5175199-expo4050-series-4-x50-expansion-joint-no-size-no-color](https://www.desertcart.jp/products/5175199-expo4050-series-4-x50-expansion-joint-no-size-no-color) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-09-15*