Footings for new 4 X 8 walkout deck

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Posted by: from Grimsby
2/20/2017 at 9:02:05 PM

Had new cement patio poured last year and also removed deck that provided exit from kitchen to backyard. I want to rebuild with same size in mind (4X8ft) but wondering if using post anchor to new slab is sufficient or does code in Niagara region require footings. Simply being used as an entry/exit into house and about 4 ft high.

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Jay in Brantford
Date/Time2/20/2017 at 9:30:32 PM

I would say post anchors would be sufficient or deck blocks but it could depend on how thick your slab of concrete was as well.

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Andy from Hickman Masonry in Surrey
Date/Time2/20/2017 at 10:39:39 PM

Hi there,

I would also use decking blocks.

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Date/Time2/21/2017 at 8:14:25 AM

Hi Jeff,

From what I am getting from your description is that your basically building this small deck above your new slab?. Post anchors should be fine for this deck. If you put rebar steel in your slab, this would have been better, but then your deck is small enough and your not supporting a lot of weight. There is a slight chance that your slab could crack near your post anchors. To help distribute weight a bit, put your posts on 2 x 6 flat on the slab. Put a membrane and caulk around the 2 x 6 for water.

Do you home work, get a few Detailed Estimates.

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Date/Time2/21/2017 at 4:18:36 PM

I would do it once and do it right. I would install footings to support.

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Yucel from CPM Group Inc. in TORONTO
Date/Time2/21/2017 at 7:28:19 PM

To do a right job you need footing. This will ensure that any movement will not effect the slab or deck. The deck is small but you have load on one point all the time. What happens when it snows heavy in winter. This will cause cracks on your slab over time.

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Date/Time2/22/2017 at 11:30:00 AM


Put in two concrete 8" dia footings and make sure you go down 48" The frost went down that far here 2 years ago. Its the right way.

Good luck!

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Date/Time2/26/2017 at 10:04:56 AM

Good morning.

If your deck is attached to your house then you have to put in full footing to support the deck. The concrete slab is floating and will move and depending upon how it is constructed will crack and may not support the weight. It is also a code requirement.


Kingsway Construction Inc.

Glenn Rosborough

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