--- product_id: 174657781 title: "Instant Foundation Block Deck Support System for 4\" x 4\" Posts and 2\" Joists" brand: "tuffblock" price: "340 zł" currency: PLN in_stock: true reviews_count: 4 category: "Tuff Block" url: https://www.desertcart.pl/products/174657781-instant-foundation-block-deck-support-system-for-4-x-4 store_origin: PL region: Poland --- # Made from 100% recycled polyolefin Only 1.5 lbs, 28x lighter than concrete Supports 1700+ lbs load Instant Foundation Block Deck Support System for 4" x 4" Posts and 2" Joists **Brand:** tuffblock **Price:** 340 zł **Availability:** ✅ In Stock ## Summary > 🏗️ Build Bold, Build Light, Build Fast — The Future of Deck Foundations! ## Quick Answers - **What is this?** Instant Foundation Block Deck Support System for 4" x 4" Posts and 2" Joists by tuffblock - **How much does it cost?** 340 zł with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/174657781-instant-foundation-block-deck-support-system-for-4-x-4) ## Best For - tuffblock enthusiasts ## Why This Product - Trusted tuffblock brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Eco-Chic Foundation:** Crafted from 100% recycled materials with superior UV resistance for long-lasting, sustainable projects. - • **No-Dig, No-Stress Installation:** Build decks just 5.5 inches off the ground—no heavy digging or concrete mixing required. - • **Ultra-Strong Yet Feather-Light:** Supports heavy loads over 1700 lbs while weighing just 1.5 lbs—deck building made effortless. - • **Built-In Ventilation for Durability:** Innovative ventilated underside prevents moisture buildup and termite damage, ensuring your deck stands the test of time. - • **Versatile Fit for All Your Joists & Posts:** Designed to perfectly accept 2” nominal joists and 4” x 4” posts for seamless construction. ## Overview The TuffBlock Instant Foundation System revolutionizes deck building with lightweight, ultra-strong blocks supporting over 1700 lbs each. Made from 100% recycled polyolefin with high UV resistance, these blocks eliminate the need for concrete and digging, fitting all standard 2” joists and 4” x 4” posts. Their ventilated design prevents moisture and termite damage, making them the smart, sustainable choice for professional-grade floating decks and platforms. ## Description The TuffBlock Instant Foundation System is a lightweight deck foundation alternative to concrete. It consists of multiple floating deck blocks that sit on top of the ground and accept pieces of wood to construct decks, garden sheds, landings, pathways, raised walkways, cubby houses, dog shelters and more. The TuffBlock’s are made from recycled polyolefin material with an ultra high UV rating. They are designed with a ventilated underside to prevent moisture buildup. The TuffBlock system is the only block product that can be secured to the post or bearer to provide extra stability. Each TuffBlock can support up to 1,700 pounds and weighs only 1.5 pounds. They are designed to accept 2” x 4”, 2” x 6”, 2” x 8” Joists and 4” x 4” Posts. The TuffBlock system is unique because it allows you to build a deck that is 5.5 inches low without the need for digging. Review: Great easy product - Worked great for a seasonal campsite that we built a deck for! Review: Lowes sells for $8.99. Great product! - Great product. Easy to use. $8.99 at Lowes ## Features - Instant foundation system used for building floating decks and platforms - Replaces heavy concrete blocks - Each block designed to support over 1700 lbs - Weights 1.5 lbs -- 28 times lighter than concrete - Extremely adaptable to accept all 2" nominal joists and 4 x 4 posts ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07YN6HMHM | | Best Sellers Rank | #101,735 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #213 in Braces & Joist Hangers | | Brand | TuffBlock | | Brand Name | TuffBlock | | Customer Reviews | 4.4 out of 5 stars 44 Reviews | | Grade Rating | Commercial | | Item Dimensions | 12 x 12 x 3.5 inches | | Item Form | solid | | Item Shape | Rectangular | | Item dimensions L x W x H | 12 x 12 x 3.5 inches | | Manufacturer | TuffBlock | | Material | 100% Recycled High Strength Closed Loop Polyolefin | | Model Number | TB001602 | | Number of Items | 1 | | Part Number | TB001602 | | Shape | Rectangular | | Unit Count | 1.0 Count | ## Product Details - **Brand:** TuffBlock - **Item Form:** solid - **Item dimensions L x W x H:** 12 x 12 x 3.5 inches - **Material:** 100% Recycled High Strength Closed Loop Polyolefin - **Shape:** Rectangular ## Images ![Instant Foundation Block Deck Support System for 4" x 4" Posts and 2" Joists - Image 1](https://m.media-amazon.com/images/I/51eQWg9sn+L.jpg) ![Instant Foundation Block Deck Support System for 4" x 4" Posts and 2" Joists - Image 2](https://m.media-amazon.com/images/I/61fLlMI9B2L.jpg) ![Instant Foundation Block Deck Support System for 4" x 4" Posts and 2" Joists - Image 3](https://m.media-amazon.com/images/I/61OWteYswUL.jpg) ![Instant Foundation Block Deck Support System for 4" x 4" Posts and 2" Joists - Image 4](https://m.media-amazon.com/images/I/61vW1ywLwML.jpg) ![Instant Foundation Block Deck Support System for 4" x 4" Posts and 2" Joists - Image 5](https://m.media-amazon.com/images/I/61RbzBuH1CL.jpg) ## Questions & Answers **Q: How many are in each order?** A: $32 for 1?! Go to Lowe’s. They are like $9.80 for 1! **Q: How many would I need for a 10x20 shed floor?** A: The number you need is determined by size of the beam, most small sheds are probably 2 x 6 joists and spacing should not exceed 5'. Are you using 4x4 posts? **Q: 3rd image shows a 2x6 being held along the side. How high off the ground is the 2x6 from the ground?** A: It’s about 2-3” **Q: Can one be used for mailbox support?** A: Don’t see why not. Put a 4x4 post in the middle and should be good to go! Make sure surface is level under the block. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great easy product *by J***L on June 3, 2021* Worked great for a seasonal campsite that we built a deck for! ### ⭐⭐⭐⭐⭐ Lowes sells for $8.99. Great product! *by R***S on June 27, 2022* Great product. Easy to use. $8.99 at Lowes ### ⭐⭐⭐⭐ Seem to work well *by D***L on May 17, 2022* The openings are different sizes, none of which are ideal for the actual measurements of a 2x4. For this I take off one star. For the 7'x7' shed platform I built, these seem to work great. They're also much easier to work with than the concrete version of the same thing. ## Frequently Bought Together - TuffBlock Instant Foundation Block Deck Support System for 4" x 4" Posts and 2" Joists - BuildTuff TuffBlock Deck Support - 8 Count - Pro-Grade Composite Shims for Heavy Duty Leveling. 24 pk 7.75 Inch, Never Rot, Easy Snap, Level Wedges. Water, Weather Resistant for Toilets, Doors, Windows, Sheds. Support Appliances and Furniture --- ## 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.pl/products/174657781-instant-foundation-block-deck-support-system-for-4-x-4](https://www.desertcart.pl/products/174657781-instant-foundation-block-deck-support-system-for-4-x-4) --- *Product available on Desertcart Poland* *Store origin: PL* *Last updated: 2026-05-23*