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ThreeBlurryDecades t1_je76nls wrote

For a deck that size in south ontario I would put posts in 42"- 48" deep sonotube. Deckblocks can be okayish for tiny decks but you will have problems with a 12x24 on them.

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Chuckw44 t1_je7jjb8 wrote

You would go down 4ft for a deck that is 18 inches off the ground?

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Robot0verlord t1_je7odii wrote

You need to penetrate below the frost line regardless of how far off the ground the deck is.

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134dsaw t1_je7owfm wrote

That's the frost line in southern Ontario. There's no sense pouring a footing unless you get below the frost.

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LeatherDonkey140 t1_je8jbko wrote

I would not do deck blocks…I would do a 24”x24x18” footing with a Simpson post base….and a couple of #4 bars horiz. And a bent one going from horiz to vert in center … I would also do a sono tube -8” above grade , burying posts is a bad idea even if ptdf…I build in Ca so frost not an issue, wood has no business sub grade, and deck blocks unless set in a footing are shit. I have built many decks this way, no issues.

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jspurr01 t1_je7v7lp wrote

Southeast Michigan here - slightly north of Windsor, Ontario. I have about 1000 SF of decking, portions built in 1984, 1994, 2005. Did them all with a rented post hole digger and a couple bags of Redi-mix each. The last section was done with sonotubes. All are still rock solid. It wasn’t that expensive - and probably just a day or two to auger the post holes, pour and set the posts.

The decking and railings cost way more than setting posts.

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