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

🪵Supports 1.5 & 2 inch joists, 3.5 & 4 inch posts

⚖️Ultra-lightweight: 1.5 lbs, 28x lighter than concrete

🏋️‍♂️Load rated 1,700 lbs, break tested 11,000+ lbs

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Bs.14118

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Sold byAmazon BoliviaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Build smarter, not harder — the future of foundations is here!

UNMATCHED STRENGTH - Supports heavy loads with break testing far beyond industry standards
EFFORTLESS HANDLING - Ultra-lightweight design means easy transport and installation without heavy lifting
BUILT TO LAST OUTDOORS - UV stabilized and moisture-resistant to protect your investment for decades
ECO FRIENDLY CERTIFIED - Made from 100% recycled materials with ICC-ES certification and a 25-year warranty
VERSATILE FIT FOR EVERY PROJECT - Accepts multiple joist and post sizes for decks, sheds, and more

The Instant Foundation Block 24-Pack by Evolve Group revolutionizes deck and raised platform construction with ultra-lightweight, versatile blocks that support up to 1,700 lbs each. Made from 100% recycled materials, UV stabilized, and designed with moisture control features, these blocks offer professional-grade strength and durability backed by a 25-year warranty and ICC-ES certification. Perfect for millennial pros seeking eco-conscious, hassle-free foundation solutions.

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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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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