--- product_id: 505967172 title: "Instant Foundation Block Deck Support System for 4\" x 4\" Posts and 2\" Joists" brand: "tuffblock" price: "£43.12" currency: GBP in_stock: true category: "Tuff Block" url: https://www.desertcart.co.uk/products/505967172-instant-foundation-block-deck-support-system-for-4-x-4 store_origin: GB region: United Kingdom --- # Fits 35-47mm joists & 4x4 posts 28x lighter than concrete Supports 770 kg+ load Instant Foundation Block Deck Support System for 4" x 4" Posts and 2" Joists **Brand:** tuffblock **Price:** £43.12 **Availability:** ✅ In Stock ## Summary > 🛠️ Elevate your build with the lightest, strongest foundation block on the market! ## 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?** £43.12 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/505967172-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 - • **DIY Game-Changer:** No digging required for decks as low as 6.5 inches—speed up your project and impress your neighbors. - • **Low-Profile, High-Impact:** Sleek satin black finish blends seamlessly into any landscape—ditch the bulky concrete blocks. - • **Built to Last, Built to Protect:** UV-resistant, termite-deterring recycled polyolefin ensures durability and peace of mind. - • **Versatile Fit for Every Project:** Engineered to perfectly hold 2x4 to 2x8 joists and 4x4 posts, adapting to your unique build. - • **Unmatched Strength, Featherweight Design:** Supports over 1,700 lbs while weighing just 1.5 lbs—deck foundations redefined. ## Overview The Instant Foundation Block Deck Support System by TuffBlock offers a revolutionary, ultra-lightweight foundation solution supporting over 770 kg per block. Designed for 4x4 posts and 2" joists, it features a low-profile satin black finish, UV-resistant recycled material, and termite protection—perfect for professional and DIY projects seeking strength, versatility, and sleek aesthetics without the bulk of traditional concrete. ## Description Since the inception of Deck Blocks in 1988 in the USA, instant foundation blocks have been the preferred method for creating a strong and stable foundation for many professional & DIY projects worldwide. The concept has literally revolutionised the way we look at deck & raised platform construction, with millions of projects completed each year using the system. TuffBlock’s are made of high strength closed loop recycled polyolefin material with an ultra high UV rating. Designed with a ventilated underside to prevent moisture buildup and deter termites. TuffBlock’s are the only block product that are able to be secured to the post/bearer for extra stability An individual TuffBlock can support over 770 kgs (1,700 lbs) and weighs only 680 grams (1½ lbs). Designed to accept 35-47mm (2" x 4", 2" x 6", 2" x 8") Joists and 90 x 90mm - 100 x 100mm (4" x 4") Posts, TuffBlocks truely are the lightest, most versatile and easy to use deck foundation system on the market. Unique to the TuffBlock is the ability for low level decking, it is now possible to build a deck as low as 165mm (6½ inches) without the need for digging. No more ugly concrete blocks in your yard. The slimline profile and satin black finish means a TuffBlock easily blends into the landscape and surrounds. TuffBlocks are more than just a deck foundation, they are a versatile utility block that can be used for an endless number of applications. ## Features - Multi-purpose foundations for a range of home improvement projects including decks, sheds, pathways, raised walkways and more - Designed to support 770 kgs / 1,700 lbs & tested to over 5,000 kgs / 11,000 lbs - 28 times lighter than standard concrete and 11 times lighter than the Handi Block - Designed to accept 35-47mm (2" x 4", 2" x 6", 2" x 8") Joists and 90 x 90mm - 100 x 100mm (4" x 4") Posts - Low profile design ## Technical Specifications | Specification | Value | |---------------|-------| | Item diameter | 100 Millimetres | | Item form | Sheet | | Specification met | Partially Met | | Number of items | 1 | | Manufacturer | TuffBlock | | Part number | TB001602 | | Item Weight | 630 g | | Item model number | TB001602 | | Finish | Satin | | Item Package Quantity | 1 | | Cutting Diameter | 100 Millimetres | | Batteries included? | No | | Batteries Required? | No | ## Product Details - **Brand:** TuffBlock - **Colour:** Black - **Item dimensions L x W x H:** 30.5 x 30.5 x 8.9 centimetres - **Material:** Polyolefin - **Shape:** rectangular prism ## 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. ## 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.co.uk/products/505967172-instant-foundation-block-deck-support-system-for-4-x-4](https://www.desertcart.co.uk/products/505967172-instant-foundation-block-deck-support-system-for-4-x-4) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-17*