How to size footings
by Deborah Ford
I am building a small deck at my back door (so I can let my dogs out). It will be 10 feet wide (against the house) and 6' 8'' out. It will be freestanding so I don't have to work with a ledger board.
I have dug 4 holes at 6'6" on center apart (wide) and the first two are 18" (centerline) from house and the next two are 48" (centerline) from those. The paper I have says to make the cylinder foundations 16" in diameter and 30" deep. The depth is not a problem.
All my neighbors decks have 12" diameter cylinders and I think 16" is too much for such a little deck. I can't find the building codes for Anne Arundel county Maryland. The web just keeps putting me to deck builders and I am doing it myself.
What size do my cylinders need to be? I can't even find 16" sono tubes.
Deborah (who is tired of walking my dogs around the house to the back yard)
Shallow Footings For Deck
by Steve Cara
(Ottawa, ON, Canada)
I'm building a deck for a client that is in two parts.
I've tied the main deck to the house and poured 6 footings for it, then tied the second (lower) deck to the first in an "L" shape. The second deck has 9 footings.
Most of the footings are between 3 and 4 feet deep. About three of them are between 1.5 and 2.5 feet in depth due to solid obstructions to both shovel and auger (Rock and Construction Debris). They are not, however, on bedrock.
Should I be concerned about these heaving? If so, what can I do to shore them up?
Alternate method to burying posts in concrete footings???
I am planning to build/rebuild a deck that is attached to the house and hangs over a daylight basement. The deck is about 9 ½’ above the ground at its highest point. It appears that Olympia, WA code requires 18” diameter footings 4’ deep with 6 x 6 posts buried in the concrete a minimum of 3 ½’.
This seems like complete overkill in every way but I’m guessing this is done to add lateral stability to the posts. I really don’t like the idea of having wood in contact with concrete due to the fact that the posts will be more prone to decay.
It also makes it very difficult if there was ever a need to replace a post.
Does anyone know of an alternate method of attaching a post to a footing that will have good lateral stability without actually burying the post in the concrete?
I’m thinking of something like a bracket that encases the outside of the post with a flange that bolts to the top of the footing or something similar.
I want to be prepared with other potential options to offer the permit office when I apply for a permit. Anyone know of brackets or hardware manufactured to deal with this situation?
P.S. This is the link to the Thurston county building code pertaining to deck construction.
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Where to Locate Holes for Deck Piers and Footings
When I measured where to auger my holes for the deck footings, the post will sit right on the end of the deck...
Should I have left an overhang? So the deck would overhang the post underneath...you know what i mean? Or is it OK that i have the post on the end of the deck?
Planning for deck footings and layout
by Curtis Bader
I am planning to add a 16x16 four season porch attached to my existing house.
I know the town inspector has final say but would like to lay footings out and size corner and support posts.
Right now the plan is to attach one end to sill board of existing house and put 3 12" around and 4' deep concrete footings on the outer end.
It is planned to use 2"x10" joists with the vertical supports being pressure treated 4"x4" ranging from 5' in height on one down to 3.5' on the other end due to terrain.
I have had a friend help me lay out the basics to bring to the town but think 4"x4" corner supports on the side away from the house spaced at 8' seems to small.
Your expert thoughts would be appreciated.
Deck support posts sunk in concrete or sit on footings?
by Bill Alvey
I am building a deck that is above grade, the highest elevation about 14 feet from the floor to the ground(on a hill). All recommendations I read are to put the posts (6 x 6) on footings, bolted with brackets. It seems that burying the posts and filling around with concrete is more stable. Why is this not recommended? Is it an alternative way to put the posts in?
Thanks in advance for any help.