--- product_id: 51559533 title: "M-D Building Products 20 ft Foam Large 71506 Backer Rod for Gaps and Joints, 5/8-by-20 Feet, Gray, Black, 5/8\" x 20'" brand: "m-d building products" price: "฿4076" currency: THB in_stock: true reviews_count: 6 category: "M D Building Products" url: https://www.desertcart.co.th/products/51559533-m-d-building-products-20-ft-foam-large-71506-backer store_origin: TH region: Thailand --- # 20 ft length for extensive coverage Easily trimmed to fit any gap size Weather-resistant for indoor/outdoor durability M-D Building Products 20 ft Foam Large 71506 Backer Rod for Gaps and Joints, 5/8-by-20 Feet, Gray, Black, 5/8" x 20' **Brand:** m-d building products **Price:** ฿4076 **Availability:** ✅ In Stock ## Summary > 🛠️ Seal smart, live comfortable — the pro’s choice for flawless gaps! ## Quick Answers - **What is this?** M-D Building Products 20 ft Foam Large 71506 Backer Rod for Gaps and Joints, 5/8-by-20 Feet, Gray, Black, 5/8" x 20' by m-d building products - **How much does it cost?** ฿4076 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/51559533-m-d-building-products-20-ft-foam-large-71506-backer) ## 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 - • **Multi-Use Home Hero:** From drafty doors to leaky roofs, this backer rod insulates, damp-proofs, and elevates your home's airtightness effortlessly. - • **Seamless Gap Mastery:** Effortlessly fills and seals medium gaps up to 5/8", blocking drafts and dust for a cozier, quieter space. - • **Precision Fit, Zero Fuss:** Push-in installation with flexible foam that twists and trims to your exact needs—no adhesives or mess required. - • **Concrete-Ready Foundation:** Ideal for expansion joints and concrete cracks, providing a sturdy base that enhances caulking adhesion and durability. - • **Built to Brave the Elements:** Crafted from premium weather-resistant materials, it guarantees long-lasting performance rain or shine. ## Overview The M-D Building Products 20 ft Foam Backer Rod is a versatile, weather-resistant foam filler designed to seal medium-sized gaps and joints. Measuring 5/8" in diameter and 20 feet long, it offers easy push-in installation and can be trimmed to fit any gap. Perfect for both indoor and outdoor use, it enhances caulking durability, blocks drafts, dust, and moisture, and is ideal for concrete expansion joints, making it a must-have for professional-grade weatherization and home comfort. ## Description M-D Building Products 71506 Backer Rod For Gaps and Joints, 5/8-by-20 Feet, Gray Review: Perfect …… - Recommended for purpose and was perfect Review: Works very well for what I need. ## 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 | B000BQP1D4 | | Batteries Required? | No | | Batteries included? | No | | Best Sellers Rank | 542,136 in DIY & Tools ( See Top 100 in DIY & Tools ) 1,029 in Weather Stripping | | Colour | Black | | Customer Reviews | 4.6 4.6 out of 5 stars (1,400) | | Date First Available | 21 April 2012 | | Item model number | MD Building - 71506 | | Material Type(s) | Rubber Vinyl Silicone | | Number of pieces | 1 | | Product Dimensions | 609.6 x 1.59 x 1.59 cm; 49.9 g | ## Product Details - **Brand:** M-D Building Products - **Colour:** Black - **Item form:** Strip - **Item weight:** 50 g - **Surface recommendation:** Door ## Images ![M-D Building Products 20 ft Foam Large 71506 Backer Rod for Gaps and Joints, 5/8-by-20 Feet, Gray, Black, 5/8" x 20' - Image 1](https://m.media-amazon.com/images/I/61HHJ4QXlvL.jpg) ## Available Options This product comes in different **Color** options. ## Questions & Answers **Q: This will seem like a bizarre question, but does it smell? (Like the majority of Chinese-made closed cell foam materials.)** A: I use it for taxidermy purposes and havent noticed any smell. **Q: Is product gray or black?** A: Mine was Gray... **Q: Can i use that to repair my garage floor cracks with the concrete caulk?** A: I wouldn’t. It’s just foam. If the crack is huge I would use sand as a filler and apply a deep layer of concrete patch **Q: does this break down or come apart easily when wet?** A: No. Its foam.. it doesnt break down at all ## Customer Reviews ### ⭐⭐⭐⭐⭐ Perfect …… *by N***M on 3 April 2022* Recommended for purpose and was perfect ### ⭐⭐⭐⭐⭐ Review *by C***A on 8 October 2025* Works very well for what I need. ### ⭐ Review *by M***M on 20 September 2023* I use 5/8’s for posting my Dobermans ears and the closest Home Depot was of out of stock so I ordered this from Amazon. This is definitely the wrong size. Much smaller and created issues. ## Frequently Bought Together - M-D Building Products - Versatile Gray Foam Backer Rod - Set 5/8in x 20ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71506) - 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 71480 1/2-Inch by 20-Feet Backer Rod, Gray --- ## 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.co.th/products/51559533-m-d-building-products-20-ft-foam-large-71506-backer](https://www.desertcart.co.th/products/51559533-m-d-building-products-20-ft-foam-large-71506-backer) --- *Product available on Desertcart Thailand* *Store origin: TH* *Last updated: 2026-04-26*