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

€ 1576.76

Duties & taxes included

In stock

Sold byAmazon FranceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🏗️ Build Bold, Build Light — The Future of Deck Foundations!

UNMATCHED STRENGTH - Each block supports over 1700 lbs, ensuring rock-solid stability for your projects.
LIGHTWEIGHT PORTABLE - At just 1.5 lbs, these blocks are 28 times lighter than concrete, making transport and setup a breeze.
ECO FRIENDLY DURABILITY - Crafted from recycled materials with ultra-high UV resistance for long-lasting outdoor performance.
VERSATILE COMPATIBILITY - Designed to fit all 2-inch nominal joists and 4x4 posts, perfect for decks, sheds, and more.
EFFORTLESS DECK BUILDING - No digging required—install decks as low as 6.5 inches off the ground with ease.

The TuffBlock Instant Foundation System offers a revolutionary lightweight alternative to traditional concrete blocks, supporting over 1700 lbs while weighing only 1.5 lbs. Made from recycled polyolefin with superior UV protection, these blocks enable quick, no-dig installation for decks and platforms as low as 6.5 inches off the ground. Compatible with a wide range of joists and posts, TuffBlock delivers eco-friendly durability and unmatched convenience backed by a 25-year warranty.

Specifications

ASIN	B075G8C9C4
Best Sellers Rank	#507,636 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #316 in Decking
Brand Name	Tuffblock
Capacity	1700 pounds
Color	Black
Customer Reviews	4.6 4.6 out of 5 stars (126)
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 Items	24
Number of Pieces	24
Unit Count	24 Count
Warranty Description	25 year warranty

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