Can they be used for fence post?

No, they are really not appropriate as a fence post base. They aren't designed to supply much lateral support. They're meant to support a deck post.

My local building inspection office requires an icc, intertech, or similar evaluation product evaluation for new products does this have one?

Yes, their website shows the product has been evaluated and been certified. Search Tuff Block certification and the search should take you to the web page with the information! Good Luck!

How many would i need for a 20'x20' woodworking shop/ shed with a loft?

One big package does 10x10 so I would get 2. I had maybe 5 blocks left over.

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Instant Foundation Block for Decks (24-Pack)

Instant Foundation Block for Decks (24-Pack)

Product ID: 70667234

Details

Brand
Tuffblock
Capacity
1700 Pounds
Color
Black
Material
High strength
Product Dimensions
11.81"L x

♻️Made from recycled polyolefin with UV protection

⚖️Only 1.5 lbs, 28x lighter than concrete

🏗️Supports 1700+ lbs load

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€ 1260.30

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In stock

Sold byAmazon ItalyDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🏡 Build Bold, Build Fast — The Future of Deck Foundations is Here!

ECO CHIC DURABILITY - Crafted from recycled materials with ultra-high UV resistance for long-lasting outdoor resilience.
NO DIG INSTANT SETUP - Build decks as low as 6.5" off the ground with zero concrete, zero mess, zero wait.
ULTRA STRONG YET FEATHER LIGHT - Supports massive 1700 lbs while weighing just 1.5 lbs—deck building made effortless.
VERSATILE FIT FOR ALL PROJECTS - Adapts seamlessly to 2" nominal joists and 4x4 posts—perfect for decks, sheds, walkways, and more.
BUILT IN VENTILATION STABILITY - Innovative ventilated underside prevents moisture and termites, plus secure fastening for rock-solid stability.

The TuffBlock Instant Foundation System is a revolutionary lightweight alternative to concrete blocks, supporting over 1700 lbs while weighing only 1.5 lbs each. Designed for quick, no-dig installation, it accommodates various joist sizes and 4x4 posts, making it ideal for decks, sheds, and outdoor platforms. Made from recycled polyolefin with ultra-high UV protection and ventilated undersides, these blocks resist moisture and termites, backed by a 25-year warranty for lasting peace of mind.

Specifications

ASIN	B075G8C9C4
Best Sellers Rank	#844,350 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #609 in Decking
Brand Name	Tuffblock
Capacity	1700 Pounds
Color	Black
Customer Reviews	4.6 4.6 out of 5 stars (125)
Hole Count	2
Item Dimensions L x W	11.81"L x 11.81"W
Item Weight	1.5 Pounds
Manufacturer	Evolve Group
Manufacturer Part Number	14010011
Material Type	High strength closed loop recycled polyolefin material with an ultra-high UV rating
Number of Pieces	24
Unit Count	24.0 Count
Warranty Description	25 year warranty

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TrustScore 4.5 | 7,300+ reviews

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