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cibula11 04-05-2007 02:07 PM

Deck Footing
 
Is there a way that I can find a precast concrete pier to use for deck footings. I thought I could do this deck in a weekend if I could have the holes dug and just drop in a concrete footing. Do they make these or is it better to buy tubing and pour a quick setting concrete in that?

handy man88 04-05-2007 02:13 PM

Pour the concrete. At least it'll be easier to level the post.

concretemasonry 04-05-2007 03:54 PM

Pour the concrete in the Sonotube, insert some steel and a Simpson bracket and you wil be ready to go in a couple of days. depending on the soil temperature.

AtlanticWBConst. 04-05-2007 05:37 PM

3rd vote: Pour your own (inexpensive). If you can find a concrete/masonry supplier, the prices will be cheaper than the big home improvement stores....
Insert a J bolt after it's poured...for your simpson strong tie post bracket...

AtlanticWBConst. 04-05-2007 05:38 PM

Also: If you're in a rush...concrete/masonry supply stores carry accelerators to speed up the curing process....

robertcdf 04-05-2007 11:31 PM

On almost all of my decks I build the frame first on temp supports. Then I pour the piers and leave the temps in untill the project is complete. This gives the concrete plenty of time to cure.

cibula11 04-06-2007 09:10 AM

Is there a certain kind of cement that would be better to use? I was looking at lowes and they sell the quickcrete stuff. Could I use a fast setting concrete?

cibula11 04-06-2007 09:25 AM

I also found these http://www.redifooting.com/

concretemasonry 04-06-2007 09:29 AM

Deck Footing
 
Usually you will have all the strength you need in a couple of days if you have 60+ degree temperarures. If you are really worried about the speed you can always go to a real concrete/masonry supplier and buy an accelerator. If you use an accellerator, be very carefull with dosage. Any time you go for faster setting with additives or curing, you reduce the end strength slightly.

You really have minimal load on the piers and the only thing you have to wotty about in the first couple of days is the lateral impact. on the anchorage, whatever it may be.

Brik 04-06-2007 10:40 AM

Quote:

Originally Posted by cibula11 (Post 39813)
Is there a certain kind of cement that would be better to use? I was looking at lowes and they sell the quickcrete stuff. Could I use a fast setting concrete?

You could use the fast setting stuff. My experience is the normal stuff sets up fast enough. What you want is concrete, it has an aggregate in it.

As for the bags at the big box stores. Do the math, you will be surprised how many bags you will need. Likely a lot, even for one footing.


Lets see if I do this correctly.
One 12" by 48" sonotube is

volume = http://mathcentral.uregina.ca/QQ/dat...Q.09.03/pi.gif r2 h

5425.92 cubic inches or about 3.14 cubic feet or 0.116 cubic yards

One 80lb bag of quickrete will yield about .6 cubic feet. That means you will need about 5 and a quarter 80lb bags for one 4'x12" sonotube. Thats a lot of bags if you have multiple footings.

Someone check my math.

So, consider having a redi mix truck deliver for you. Some may charge a minimum. Sometimes you will be able to find a supplier that is willing to bring extra from a large pour. Some places will measure and mix right on the truck and deliver the relatively small quantities for you. The latter is often called "metered concrete".



cibula11 04-06-2007 02:50 PM

Can I just use an 8" tube? The posts will only be 4x4's.

Or is there an easier way to do footings for a deck?
The job will include the demolition of the current deck and then a similar reconstruction.

Brik 04-06-2007 03:37 PM

Depends on the structure above (weight) and code requirements. My example of a 12" tube was just for illustration purposes and easier math with a 12", 1' tube.

Run the numbers on an 8" x48" tube.
2411 cu" or 1.4 cu' = about 2 and a third bags per footing. Maybe more manageable depending on how many you need to do and how quickly you want to do it.

robertcdf 04-06-2007 07:06 PM

If you could post your deck size: Joist span, joist size, beam size, post spacing on the beam. I can figure what size piers you need.

AtlanticWBConst. 04-06-2007 07:40 PM

FWIW - We have some towns in our area (N.E. temperature zone) that require 12" dia. footings.

We prefer to 'overkill' all our work (within reason) so we always use 12" dia. tubes.

Depending on your soil, size of deck/design, weight loads, etc....you may or may not want to look at 'bigfoot' tubes....

just my 2 cents....

robertcdf 04-06-2007 11:09 PM

Most often your piers in the middle need to be larger than your end piers. 14",16",24",30" diameter piers are not out of the question. When you look at a beam a pier in the middle hold 2X as much weight as an end pier. 12" should be the minimum for center piers. And as I said before they can get larger depending upon your joist span and span between posts.


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