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13 votes
Accepted

Can I support 6x6" deck posts on 10" diameter poured concrete footings?

Summary - the post size seems questionable. Even at 12", it might have been insufficient. It depends very much on your soil type. The remainder of this answer is a huge estimate based on lots of ...
StayOnTarget's user avatar
  • 5,585
10 votes
Accepted

Recommended footings for deck built on rock with 5-10% grade?

1" of organic matter on rock? remove all the organic matter from the locations where the footings go, pour concrete footings or piers on the rock surface directly. Might be a good idea to drill ...
Ecnerwal's user avatar
  • 218k
7 votes

Recommended footings for deck built on rock with 5-10% grade?

sedimentary rock can be quite soft / should be easy to drill. fine for compressive strength. drill 8" deep holes using rotary hammer 3/4" quad carbide bits blow out the holes / clean holes ...
Fresh Codemonger's user avatar
6 votes

How deep do I need to make the post footings for a residential deck in Northern Michigan?

The post depth depends on the frost line. The size of the footing depends on the soil type under the footing. You need to dig until at least under the frost line, and then, if you are not on rock or ...
P2000's user avatar
  • 16k
6 votes
Accepted

Are metal anchors or buried posts better for 6 x 6 posts for a pavilion?

The pier and footing is the best approach. A structure, even a deck or pavilion should not have to rely upon the posts being anchored in concrete for structural support. The pavilion itself should be ...
HoneyDo's user avatar
  • 8,784
5 votes
Accepted

How to calculate sizing for treehouse footing?

Hmmm...no digging in the ground and no concrete. Sounds like the four perimeter beams will be your foundation. They’ll need to be treated for ground contact (pressure treated) as you indicate. ...
Lee Sam's user avatar
  • 23.3k
5 votes

Can pressure treated wood be buried in concrete?

"Pressure treated wood" isn't one thing. It's many things. Some is rated for ground contact or below grade use. Most isn't. You'd need lumber that is. You won't keep it from getting wet ...
isherwood's user avatar
  • 139k
4 votes

How/where can I find out what the frost-line is for my area?

This map shows the frost line depth for each state.
first1pass's user avatar
4 votes

Concrete retaining wall with lean and crack, looking for input

This site prefers not to provide 'call a professional' answers and I might receive some less positive reception for this answer, but this is a case where I think that it is appropriate. My suggestion ...
Ack's user avatar
  • 5,729
4 votes
Accepted

How can I pour a concrete patio under my existing deck without surrounding the deck posts in concrete?

Support either side of each post, cut it off, insert a steel stub base or pour a new concrete base to a height slightly above the planned slab, pour the new slab. Or, just make sure the "expansion ...
Ecnerwal's user avatar
  • 218k
4 votes
Accepted

Can I fill a hole with concrete that is close or even touches the footing of my house?

There's no problem with filling the hole right next to the foundation. That exactly what they do when adding on additions to houses. The "bolts" you see coming out of the existing foundation ...
JACK's user avatar
  • 81.8k
3 votes

How close can a deck post footing be to a retaining wall?

Comment by @BillDOe is correct: it should go the required depth for the post, measured from the base of the retaining wall as if there was no wall and no retained earth there. As long as it has ...
Z4-tier's user avatar
  • 1,500
3 votes

How can I protect partially buried deck posts from decay?

Check the tag on the end of your posts, see if it says it is rated for ground contact. If so, you're fine. The post base simply keeps it out of standing water. If it says above ground, you are still ...
NPM's user avatar
  • 2,021
3 votes

Can I support 6x6" deck posts on 10" diameter poured concrete footings?

If you are willing to dig some big holes, while stabilizing the piers so they don't fall on you, and do some drilling you might be able to solve this more simply. Hmm - actually, those (10" dia x ...
Ecnerwal's user avatar
  • 218k
3 votes
Accepted

Is it a problem that my post bases overhang the footing edge slightly?

If I understand correctly that the post bases overhang the sides of the concrete piers slightly, it's not an issue. As you said, 6x6 posts are unnecessarily large for the load, so as long as you have ...
isherwood's user avatar
  • 139k
3 votes
Accepted

Patio Deck Piers Construction

The green sleeve appears to point specifically to "Techno Metal Post" per a brief search. That's a specific brand of screw-pile or helical-pile. You can see the ground-screw parts on the ...
Ecnerwal's user avatar
  • 218k
3 votes

Leaning fence due to loose posts

The posts may be loose for a variety of reasons and it's worth spending a few minutes considering which are likely so that you can mitigate them. As you said it could be that the posts were set too ...
Greg Hill's user avatar
  • 30.8k
3 votes

How do I know how deep to dig a deck post hole for a 12-foot post?

You need to check the building codes for where you live. If you go to your cities website they may have it on there or you could call the local inspector. I live in Minnesota and I believe the depth ...
JD74's user avatar
  • 1,834
3 votes
Accepted

How to splice two sonotubes to extend their length

Pouring concrete directly into the drilled hole without a sonotube lining it, is typically how it is done. The sonotube is simply a handy way to get a nice looking pour above grade. If you are ...
Jack's user avatar
  • 35.5k
2 votes

How wide does a 6x6 concrete post footing need to be using an elevated post base anchor?

Well...I had to live and learn. I used 12 inch sonotubes with the same anchor and cheap cement (the fence post kind that was recommended to me) and 6 x6 posts, which turned out to be a bad idea. 2 of ...
Amymboxer's user avatar
2 votes

How will concrete fill in?

I poured three Deck Footers (Stairs) - two 10" tubes, and one 8" tube yesterday in 45 degree weather, and each about 30" in length. I filled the concrete to the top of the tubes. The tubes were each ...
Herman D's user avatar
2 votes
Accepted

Footing for deck on slope with one side near grade

Those pier blocks or deck blocks are a waste of money. It's not going to be as difficult to dig a few holes and install some real posts now as it will be after the deck is complete and has sunken (...
Ben Welborn's user avatar
  • 6,212
2 votes

Is this base idea sufficient for a ground level, not attached to the house wooden patio?

A plain old cinder block will deteriorate within a matter of years. Use blocks designed for the purpose, or pour footings like you're supposed to, following code to the letter. Concrete Deck Block: ...
Mazura's user avatar
  • 13.4k
2 votes
Accepted

Am I required to use footings when building a deck or can I just have the posts resting on the ground? (Wisconsin)

So I was able to get confirmation on an answer from a local building inspector. As per Wisconsin Administrative Code SPS 321.15(2)(f) (f) Deck footings. Decks attached to dwellings and detached ...
Programmer's user avatar
  • 2,050
2 votes

I need a concrete footing to be 5 feet tall. What circumference and reinforcement do I need?

when you are building things 24 feet up and asking these kind of questions, it should be self evident you need to hire someone to do it for you or at the very least handle the technical design and ...
personal privacy advocate's user avatar
2 votes
Accepted

Should I use concrete for a 2" square metal fence post?

Eight months later, here is my answer and update: I called the my town's building division and determined the frost line for my region is 48". It wasn't possible for me to dig below 48", so I dug to ...
Joseph's user avatar
  • 245
2 votes
Accepted

Fixing porch-supporting pier that settled because of bad drainage

I would endeavor to keep the pier but "fix" it. First would be to get the pier block back into its original, ideal position. Probably this can be done DIY with a car jack, a bunch of scrap lumber, ...
wallyk's user avatar
  • 12.3k
2 votes

Regrading under deck to protect footings from water

You need lots of fill dirt. Put about 3-4" or more right underneath the deck. Than add lots of dirt to the area outside the deck. Grade down away from the deck and divert the water toward that area of ...
Jerry_Contrary's user avatar
2 votes

Leveling a sinking 1st floor addition that is about 4' off the ground

You can do it but there may be complications. When stabilizing a job like this I would want to pour a few new footings much larger than what you have and probably add a few. When jacking the frame ...
Ed Beal's user avatar
  • 103k
2 votes

is it safe to remove soil from basement footing?

The footings need to stay on the originally compacted soil, if possible, surrounded by several feet of soil for support, which is also supported against subsidence. They have uniformly settled to ...
Upnorth's user avatar
  • 818

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