---
product_id: 174657781
title: "Instant Foundation Block Deck Support System for 4\" x 4\" Posts and 2\" Joists"
brand: "tuffblock"
price: "€ 88.94"
currency: EUR
in_stock: true
reviews_count: 3
category: "Tuff Block"
url: https://www.desertcart.fr/products/174657781-instant-foundation-block-deck-support-system-for-4-x-4
store_origin: FR
region: France
---

# Fits 2" joists & 4x4 posts Only 1.5 lbs, ultra-lightweight Supports 1700+ lbs load Instant Foundation Block Deck Support System for 4" x 4" Posts and 2" Joists

**Brand:** tuffblock
**Price:** € 88.94
**Availability:** ✅ In Stock

## Summary

> 🛠️ Build smarter, lighter, and faster—decking redefined!

## 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?** € 88.94 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fr](https://www.desertcart.fr/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

- • **Secure & Stable Foundation:** The only floating deck block system that can be fastened to posts or bearers for extra stability and peace of mind.
- • **No-Dig, No-Stress Installation:** Build decks 5.5 inches off the ground without any digging or heavy equipment.
- • **Universal Fit for Modern Builds:** Engineered to perfectly accept all 2" nominal joists and 4x4 posts for versatile deck designs.
- • **Built to Last, Designed to Protect:** Made from recycled polyolefin with ultra-high UV resistance and ventilated undersides to prevent moisture and termites.
- • **Heavyweight Support, Featherweight Feel:** Supports over 1700 lbs while weighing just 1.5 lbs—28x lighter than concrete blocks.

## Overview

The TuffBlock Instant Foundation System revolutionizes deck building by replacing heavy concrete blocks with ultra-lightweight, recycled polyolefin blocks that support over 1700 lbs. Designed for 2" joists and 4x4 posts, it enables quick, no-dig installation with superior moisture and termite resistance, making it the go-to foundation for modern 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 and termites. 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 | #285,151 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #535 in Braces & Joist Hangers |
| Date First Available | October 2, 2019 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 1.39 pounds |
| Item model number | TB001602 |
| Manufacturer | TuffBlock |
| Number of Items | 1 |
| Product Dimensions | 12 x 12 x 3.5 inches |

## 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

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**Shop now:** [https://www.desertcart.fr/products/174657781-instant-foundation-block-deck-support-system-for-4-x-4](https://www.desertcart.fr/products/174657781-instant-foundation-block-deck-support-system-for-4-x-4)

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*Product available on Desertcart France*
*Store origin: FR*
*Last updated: 2026-03-05*