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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🛠️ Build Bold, Build Light, Build TuffBlock!

UNMATCHED STRENGTH - Each block supports up to 1,700 lbs, tested beyond 11,000 lbs for rock-solid stability you can trust.
EFFORTLESS INSTALLATION - Ultra-lightweight design means no heavy lifting—set up your deck foundation in minutes, not hours.
SPACE SAVING PORTABLE - 28x lighter than traditional concrete blocks, making transport and storage a breeze for any DIY pro.
VERSATILE COMPATIBILITY - Engineered to fit a wide range of joist and post sizes, perfect for decks, sheds, and raised walkways.
FUTURE PROOF YOUR PROJECT - Durable, weather-resistant foundation blocks that keep your outdoor spaces safe and stylish season after season.

TuffBlock is a revolutionary ultra-lightweight foundation block designed for decks and outdoor projects. Weighing just 1.5 pounds, it supports up to 1,700 pounds per block and fits a variety of joist and post sizes, offering a durable, portable, and easy-to-install alternative to traditional concrete blocks.

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