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Instant Foundation Block Deck Support System for 4" x 4" Posts and 2" Joists

Based on 46 reviews
Condition: New
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$26.77
Save $93.21 was $119.98

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Availability: Only 10 left in stock, order soon!
Fulfilled by Amazon

Arrives Saturday, Nov 7
Order within 17 hours and 48 minutes

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At a glance

Condition
New
Model
TB001602
Dimensions
12 x 12 x 3.5 in
Weight
1.4 lb
Shape
Rectangular
Item Form
solid
Grade Rating
Commercial

Features 5

  • 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

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.

Specs 15

Material 100% Recycled High Strength Closed Loop Polyolefin
Brand TuffBlock
Item dimensions L x W x H 12 x 12 x 3.5 inches
Shape Rectangular
Item Form solid
Brand Name TuffBlock
Number of Items 1
Unit Count 1 Count

Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Saturday, Nov 7

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Top Amazon Reviews


Stronger than I anticipated
I used these for building a raised garden bed with 4x4 posts. This was to avoid having to dig holes for them and to save money on lumber. They worked great and were much sturdier than I anticipated. I occasionally hit them with my weed wacker and they haven't even been scratched. I will be purchasing more in the spring for my next raised bed. ... show more
Reviewed in the United States on September 16, 2026 by Colton

Great easy product
Worked great for a seasonal campsite that we built a deck for!
Reviewed in the United States on June 3, 2021 by Jason Morel

Lowes sells for $8.99. Great product!
Great product. Easy to use. $8.99 at Lowes
Reviewed in the United States on June 27, 2022 by Randy in Texas

Seem to work well
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.
Reviewed in the United States on May 17, 2022 by Darrell

Expensive
Way to expensive for the result.
Reviewed in the United States on April 21, 2026 by DAVE HENRY
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