--- product_id: 1050620 title: "ROBERTS Black Jack Underlayment - 100 sq. ft. Roll - 43\" x 28' x 2.5 mm" brand: "roberts" price: "£95.12" currency: GBP in_stock: true category: "Roberts" url: https://www.desertcart.co.uk/products/1050620-roberts-black-jack-underlayment-100-sq-ft-roll-43-x store_origin: GB region: United Kingdom --- # Closed cell moisture barrier 100 sq. ft. coverage 2.5 mm thick foam layer ROBERTS Black Jack Underlayment - 100 sq. ft. Roll - 43" x 28' x 2.5 mm **Brand:** roberts **Price:** £95.12 **Availability:** ✅ In Stock ## Summary > 🏡 Elevate your floors with comfort and confidence — the Black Jack advantage! ## Quick Answers - **What is this?** ROBERTS Black Jack Underlayment - 100 sq. ft. Roll - 43" x 28' x 2.5 mm by roberts - **How much does it cost?** £95.12 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/1050620-roberts-black-jack-underlayment-100-sq-ft-roll-43-x) ## Best For - roberts enthusiasts ## Why This Product - Trusted roberts brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Seamless Installation:** 4-inch plastic overlap with adhesive strip ensures tight, secure joins - • **Spacious Roll Coverage:** Covers 100 sq. ft. per roll for efficient installation - • **Subfloor Smoothing Power:** Levels minor imperfections for a flawless finish under laminate and engineered wood - • **Moisture-Resistant Barrier:** Dense closed-cell structure seals out moisture to protect your floors - • **Optimal Cushioning & Soundproofing:** 2.5 mm foam thickness delivers superior comfort and noise reduction ## Overview ROBERTS Black Jack Underlayment is a premium 2-in-1 solution designed for laminate, bamboo, and engineered wood floors. Featuring a 2.5 mm thick closed-cell foam layer, it provides cushioning, sound absorption, and moisture resistance. Each 100 sq. ft. roll includes a 4-inch overlap with adhesive strip for easy, secure installation, smoothing minor subfloor imperfections while protecting your investment with a limited lifetime warranty. ## Description The ROBERTS Black Jack 2-in-1 Underlayment is designed for use under floated laminate, bamboo and engineered wood floors and is ideal for many types of subflooring. Black Jack is engineered as a superior grade, 2-in-1 underlayment with a 2.5 mm thick foam layer that provides optimal cushioning and sound absorption, as well as a closed cell foam design that offers excellent moisture vapor resistance. The underlayment also features a 4 in. overlap and adhesive strip to seal out moisture and join multiple rolls. ## Features - 100 sq. ft. coverage with rolls measuring 28 ft. x 43 in. x 2.5 mm - For use under laminate and engineered wood flooring - Dense, closed cell structure offers moisture barricade - Offers cushioning, sound reduction, resistance and levels minor sub floor imperfections - Easy installation with plastic overlap and adhesive strip ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00CJBLR2I | | Best Sellers Rank | #119,307 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #39 in Flooring Underlayments | | Certification | True | | Color | Black | | Coverage | 100 square feet | | Customer Reviews | 4.5 4.5 out of 5 stars (831) | | Date First Available | April 26, 2013 | | Finish | Premium | | Included Components | Underlayment Roll | | Item Package Quantity | 1 | | Item Weight | 1.95 pounds | | Item model number | 70-026 | | Manufacturer | Roberts | | Material | Foam-based material | | Part Number | 70-026 | | Product Dimensions | 336 x 43 x 0.09 inches | | Shape | Rectangular | | Size | 100 sq. ft. | | Style | Jack | | Thickness | 2.5 millimeters | | Warranty Description | Limited Lifetime | ## Product Details - **Brand:** ROBERTS - **Color:** Black - **Item dimensions L x W x H:** 336 x 43 x 0.09 inches - **Material:** wood - **Shape:** Rectangular ## Images ![ROBERTS Black Jack Underlayment - 100 sq. ft. Roll - 43" x 28' x 2.5 mm - Image 1](https://m.media-amazon.com/images/I/61k34JuU41L.jpg) ![ROBERTS Black Jack Underlayment - 100 sq. ft. Roll - 43" x 28' x 2.5 mm - Image 2](https://m.media-amazon.com/images/I/31IcKgoy9iL.jpg) ![ROBERTS Black Jack Underlayment - 100 sq. ft. Roll - 43" x 28' x 2.5 mm - Image 3](https://m.media-amazon.com/images/I/5196zvvGdFL.jpg) ![ROBERTS Black Jack Underlayment - 100 sq. ft. Roll - 43" x 28' x 2.5 mm - Image 4](https://m.media-amazon.com/images/I/51IaE4Y974L.jpg) ![ROBERTS Black Jack Underlayment - 100 sq. ft. Roll - 43" x 28' x 2.5 mm - Image 5](https://m.media-amazon.com/images/I/51l6WOA5vdL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: What is the sound ratings ,ie IIC,STC,in order to comply with HOA** A: That is incorrect, from Roberts website, it's a bit higher with IIC at 70 and STC at 66 **Q: Whats R-Value or Thermal Resistance for this Underlayment? Installing over Radiant Heated Concrete slab and need a low R-value.** A: The manufacturer's information doesn't really say anything about R value and I doubt there is any. It must be extremely extremely small. I installed this underlayment over dricore panels. Works great... **Q: What density rating is this product?** A: Hi! Please refer to below information. item# thickness times density (kg/m³) 70-026　2.5MM 30　 33 **Q: Would this work on a van floor?** A: Debra,This backing provides moisture and sound benefits for rigid flooring over cement applications. It is easily ripped if you are not careful when installing flooring. I'd use something more durable for a vehicle especially if moisture or sound reduction isn't an issue. ## Frequently Bought Together - ROBERTS Black Jack Underlayment - 100 sq. ft. Roll - 43" x 28' x 2.5 mm - ROBERTS 50-040 Underlayment Tape Roll, Red - ROBERTS 70-115 Moisture Barricade Underlayment Film, for Vinyl, Laminate SPC, Engineered Wood Floors, 6 mil. Thick, Polyethylene, 120 Sq. Foot Roll, Black --- ## 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.uk/products/1050620-roberts-black-jack-underlayment-100-sq-ft-roll-43-x](https://www.desertcart.co.uk/products/1050620-roberts-black-jack-underlayment-100-sq-ft-roll-43-x) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-10-25*