---
product_id: 387064322
title: "Instant Foundation Block Deck Support System for 4\" x 4\" Posts and 2\" Joists"
brand: "tuffblock"
price: "KSh44786"
currency: KES
in_stock: true
url: https://www.desertcart.co.ke/products/387064322-instant-foundation-block-deck-support-system-for-4-x-4
store_origin: KE
region: Kenya
---

# Fits 35-47mm joists & 90-100mm 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:** KSh44786
**Availability:** ✅ In Stock

## Summary

> 🏗️ Build Bold, Build Light, Build Now!

## 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?** KSh44786 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.ke](https://www.desertcart.co.ke/products/387064322-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

- • **Low-Profile, High-Impact:** Sleek satin black finish blends seamlessly with your landscape—no more bulky concrete eyesores.
- • **DIY Friendly & Pro-Approved:** Instant setup with secure post/bearer attachment—perfect for pros and weekend warriors alike.
- • **Versatile Fit for Every Build:** Accommodates 2x4 to 2x8 joists and 4x4 posts for ultimate project flexibility.
- • **Built to Last, Engineered to Protect:** UV-resistant, ventilated design prevents moisture buildup and termite damage for lasting durability.
- • **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 revolutionizes deck and raised platform construction with its ultra-lightweight, high-strength recycled polyolefin design. Supporting over 770 kg per block and tested beyond 5,000 kg, it fits standard joists and posts while offering a sleek, low-profile look that resists UV damage and moisture. Ideal for professionals and DIYers seeking a fast, durable, and versatile foundation solution without the hassle of 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 form | Rectangular |
| Specification met | Yes |
| Number of Items | 1 |
| Manufacturer | TuffBlock |
| Part number | TB001602 |
| Item Weight | 630 g |
| Product Dimensions | 30.48 x 30.48 x 8.89 cm; 630 g |
| Item model number | TB001602 |
| Color | Black |
| Finish | Satin |
| Item Package Quantity | 1 |
| Batteries Included? | No |
| Batteries Required? | No |

## Product Details

- **Material:** 100% Recycled High Strength Closed Loop Polyolefin
- **Brand:** TuffBlock
- **Item dimensions L x W x H:** 30.5 x 30.5 x 8.9 centimeters
- **Colour:** Black
- **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.

## 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

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**Shop now:** [https://www.desertcart.co.ke/products/387064322-instant-foundation-block-deck-support-system-for-4-x-4](https://www.desertcart.co.ke/products/387064322-instant-foundation-block-deck-support-system-for-4-x-4)

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*Product available on Desertcart Kenya*
*Store origin: KE*
*Last updated: 2026-01-27*