--- product_id: 5587474 title: "MD Building Foam Backer Rod, Gray, 3/8in x 20ft for Small Gaps" brand: "m-d building products" price: "₩24112" currency: KRW in_stock: true category: "M D Building Products" url: https://www.desertcart.kr/products/5587474-md-building-foam-backer-rod-gray-3-8in-x-20ft store_origin: KR region: South Korea --- # Easily cut to fit any gap Weather-resistant & waterproof 3/8in x 20ft perfect gap size MD Building Foam Backer Rod, Gray, 3/8in x 20ft for Small Gaps **Brand:** m-d building products **Price:** ₩24112 **Availability:** ✅ In Stock ## Summary > 🔧 Seal Smart, Save More: The Ultimate Gap Filler for Pros Who Demand Perfection ## Quick Answers - **What is this?** MD Building Foam Backer Rod, Gray, 3/8in x 20ft for Small Gaps by m-d building products - **How much does it cost?** ₩24112 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/5587474-md-building-foam-backer-rod-gray-3-8in-x-20ft) ## Best For - m-d building products enthusiasts ## Why This Product - Trusted m-d building products brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **All-Weather Durability:** Crafted from closed-cell rubber foam, it resists moisture, insects, and harsh outdoor conditions. - • **Effortless Customization:** Trim with scissors or twist for larger gaps—installation is quick and mess-free. - • **Precision Fit for Small Gaps:** Snug 3/8in diameter seals medium gaps flawlessly, blocking drafts and dust. - • **Versatile Indoor/Outdoor Use:** Ideal for windows, doors, driveways, and expansion joints—your go-to for airtight, draft-proof comfort. - • **Caulk Saver & Efficiency Booster:** Prevents caulk waste by providing a sturdy backing, ensuring smooth, long-lasting seals. ## Overview The MD Building Foam Backer Rod is a 3/8in x 20ft closed-cell rubber foam designed to fill medium-sized gaps indoors and outdoors. Weather-resistant and waterproof, it prevents drafts, moisture, dust, and insects while providing a reliable base for caulking. Easy to cut and install, it enhances sealant durability and efficiency, making it a top choice for professional-grade gap sealing and insulation. ## Description desertcart.com: MD Building Foam Backer Rod, Gray, 3/8in x 20ft for Small Gaps | Closed-Cell Foam, Prevents Caulk Waste, Cuts With Scissors, Blocks Drafts Moisture Dust Insects, Indoor/Outdoor : Industrial & Scientific ## Features - Quality Construction: This gap filler is made from high-quality, weather-resistant materials, ensuring long-lasting durability and performance. It effectively seals medium gaps between surfaces, preventing drafts and dust from entering your home. Suitable for both indoor and outdoor use, it withstands various weather conditions, providing consistent protection and improved comfort. - Concrete Gap Filling Excellence: Our product excels in filling concrete gaps, creating a strong foundation for caulking projects. Utilize this foam to effectively fill joints between surfaces, ensuring dependable adhesion for caulking applications that promise enduring durability and resilience. - Complete Gap Solution: This product provides versatile gap filling, preventing drafts and offering a sturdy base for caulking. Perfect for expansion joints in driveways and sidewalks, it can be twisted for larger gaps and easily trimmed with scissors to the desired size. - Effortless Installation: Enjoy a hassle-free setup by effortlessly pushing the backer rod into most joint openings until it fits snugly. Once installed, enhance the seal further by applying caulk on top—no need for messy sealants or adhesives. - Versatile Application: From repairing leaky roofs and window sills to addressing drafty doors, the Backer Rod is your go-to solution! Beyond sealing surface gaps, it excels in insulating, enhancing airtightness, and damp-proofing your home—offering multifaceted benefits for various household needs. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B000BQS90G | | Best Sellers Rank | #1,333 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #2 in Rope Caulk #15 in Industrial Sealants #554 in Hardware | | Brand | M-D Building Products | | Brand Name | M-D Building Products | | Color | Gray | | Customer Reviews | 4.6 out of 5 stars 1,682 Reviews | | Global Trade Identification Number | 00043374714647 | | Included Components | MD Building - 71464 - 2pk | | Item Form | Foam | | Item Highlight | Closed-Cell Foam, Prevents Caulk Waste, Cuts With Scissors, Blocks Drafts Moisture Dust Insects, Indoor/Outdoor | | Item Type Name | MD Building - 71464 - 2pk | | Item Weight | 17.01 g | | Manufacturer | M-D Building Products | | Material Type | Rubber | | Model | 71464 | | Number of Items | 1 | | Number of Packs | 1 | | Part Number | 71464 | | Surface Recommendation | surface_recommendation | | UPC | 043374714647 | | Unit Count | 1 Count | | Warranty Description | All M-D products are warranted to be free from defects in material and workmanship if installed and used in strict accordance with our installation instructions. | | Water Resistance Level | Waterproof | ## Product Details - **Brand:** M-D Building Products - **Color:** Gray - **Item Form:** Foam - **Item Weight:** 17.01 g - **Surface Recommendation:** surface_recommendation ## Images ![MD Building Foam Backer Rod, Gray, 3/8in x 20ft for Small Gaps - Image 1](https://m.media-amazon.com/images/I/61bhNB8Z9UL.jpg) ## Available Options This product comes in different **Size, Style** options. ## Questions & Answers **Q: how many feet come in a 3 pk?** A: Both INDIVIDUAL packs - the 3/8" and the 1/2"- are 20 feet long. **Q: no 1/4" one? either 20 or 50ft?** A: Not in this brand, but Amazon offers 1/4-inch backer rod in various lengths, from 10 feet to 100 feet, from other brands. Just search on "Backer Rod 1/4 Inch". **Q: can the backer rod be sliced for smaller openings?** A: I have not done that, but it cuts easily with a sharp knife or scissors, so you should be able to slice it to fit whatever opening you have. It's good stuff! **Q: Can his be used for exterior windows before caulking?** A: I used it to push into larger cracks in my driveway before applying concrete filler, and it worked great. I'm thinking that it should work well for filling in spaces around your windows prior to caulking. ## Frequently Bought Together - M-D Building Products - Versatile Gray Foam Backer Rod - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling, 3/8 by 20 Feet, (Pack of 2) (71464) - M-D Building Products - Versatile Gray Foam Backer Rod Set 1/2in x 20ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71480) - Sikaflex Self Leveling Sealant, Gray, polyurethane with an accelerated curing capacity for sealing horizontal expansion joints in concrete, 10.1 fl. oz Cartridge --- ## 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.kr/products/5587474-md-building-foam-backer-rod-gray-3-8in-x-20ft](https://www.desertcart.kr/products/5587474-md-building-foam-backer-rod-gray-3-8in-x-20ft) --- *Product available on Desertcart South Korea* *Store origin: KR* *Last updated: 2026-10-31*