All concrete used to support decks should have reinforcing steel. Concrete only has one-tenth the strength in tension as it does in compression. The blocks may or may not contain reinforcing steel.The Internet is littered with photos and stories about ground-contact treated lumber that has rotted or been attacked by insects. The blocks have to be buried which means the wood deck post is also partially buried, leaving it subject to moisture penetration and wood-destroying insects.The post just rests on the block and you hope the concrete lugs don’t break off the block over time. Concrete pier blocks don’t have any way to mechanically connect to the wood deck posts.
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