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Old 09-11-2010, 03:19 PM   #1
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setting deck posts (4x4) in concrete anchors/piers


i am about to build a 6x10 deck that will be about 30" above the ground.

was wondering if i should anchor the posts by setting them into the holes and then pour concrete around or pour concrete anchors/piers and then fasten the posts on top of them with braces and screws? i've seen some books that recommend the latter but, since it is easy for me to pour concrete vs. buying pre-made anchors/piers, i was wondering if setting them in might be sturdier as well as avoid braces and drilling in concrete ?

thanks

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Old 09-11-2010, 03:28 PM   #2
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setting deck posts (4x4) in concrete anchors/piers


I set mine on top of the concrete & installed the anchors.. I don't like & didn't use 4x4 . Being that tall . I would use 6x6

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Old 09-11-2010, 03:33 PM   #3
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setting deck posts (4x4) in concrete anchors/piers


thanks. 6x6 makes sense. also, for a deck that size, do you think 4 posts will be enough (also on one 10 ft side of the rectangle, the deck anchors to the house) or should i go with more, e.g. 6 or even 7 (one in the center) ?
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Old 09-11-2010, 03:40 PM   #4
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setting deck posts (4x4) in concrete anchors/piers


Mine bolts to the house on the back side. my deck is 24' x 12 ' . I used 4 6x6 post
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Old 09-11-2010, 04:08 PM   #5
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setting deck posts (4x4) in concrete anchors/piers


Here is the new minimum deck code, anything more will be better: http://www.lancova.com/deckinfo.pdf

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Old 09-07-2011, 05:01 PM   #6
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setting deck posts (4x4) in concrete anchors/piers


I see most posts on the internet say not to encase 4x4's in concrete. I need to build a 6' x 6' x 10' tall free standing structure. I need it to be stable and not fall over for risk of injury. How can I secure these posts to footings and have sheer resistance?
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Old 09-07-2011, 07:22 PM   #7
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setting deck posts (4x4) in concrete anchors/piers


Posts need to set on piers and not contact the earth at all---use Simpsom post attachments---

Codes vary a lot---so check ----no buried posts in this area.----Mike---
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Old 09-07-2011, 08:31 PM   #8
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setting deck posts (4x4) in concrete anchors/piers


I agree. There really is no debate here. You just don't put wood into concrete. Especially support members. Its that simple. People who are doing it are doing it wrong. Use the anchors. They work great and are real easy to use. They also give you a little bit of wiggle room in case your centers are off a little (within reason). If you ledger it to the house on one side, 4 4x4s holding a support beam will be sufficient.
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Old 09-12-2011, 07:59 PM   #9
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setting deck posts (4x4) in concrete anchors/piers


my deck is fully floating, 36" high. i used 4x4 post on simpson strong tie ancor into concrete pier. i was also worried about lateral movement due to no ledger.. but when i installed hurricane ties between all beams & joists it made a HUGE difference. deck is absolutely solid with no movement whatsoever.

for 10' long span, .. in MY AREA .. you can use a post on each end as long as a) beams are double 2x10 and b) we are talking about outside beams only (inside beams would need 3 posts).

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Old 09-12-2011, 08:33 PM   #10
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setting deck posts (4x4) in concrete anchors/piers


I used 6x6 posts with the adjustable Simpson Strong Tie anchors. They are attached to the piles with J-shaped stainless steel threaded rod. Building inspector was very happy with the system.

I would never put wood in concrete (concrete holds moisture, which wood likes to soak up).

Keep up posted with what you do.
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Old 09-24-2011, 08:45 PM   #11
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setting deck posts (4x4) in concrete anchors/piers


dpach, what is the diameter of the concrete with respect to the 6x6 post? in my area, the diameter would have to be 12" (double width of post) which is a lot of concrete for a large deck!

.. but concrete is cheap
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Old 09-24-2011, 09:22 PM   #12
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setting deck posts (4x4) in concrete anchors/piers


dpach, this is one bada$$ looking deck. i love the trailer space underneath. congratulations!!
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Old 09-25-2011, 12:02 AM   #13
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setting deck posts (4x4) in concrete anchors/piers


Quote:
Originally Posted by Knucklez View Post
dpach, what is the diameter of the concrete with respect to the 6x6 post? in my area, the diameter would have to be 12" (double width of post) which is a lot of concrete for a large deck!

.. but concrete is cheap
The piles are 12" wide, and 12 feet deep. Yeah, it was about $1100 to have guys come in and drill, form and pour them (including concrete) but worth every dollar to make sure this deck never moves.
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Old 09-25-2011, 12:06 AM   #14
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setting deck posts (4x4) in concrete anchors/piers


Quote:
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dpach, this is one bada$$ looking deck. i love the trailer space underneath. congratulations!!
Thanks. Took over a year to finish (had 5 mths of snow and rain where I couldn't do a darn thing). Worked out great for the snowmobile trailer.
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Old 09-25-2011, 01:30 PM   #15
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setting deck posts (4x4) in concrete anchors/piers


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The piles are 12" wide, and 12 feet deep. Yeah, it was about $1100 to have guys come in and drill, form and pour them (including concrete) but worth every dollar to make sure this deck never moves.
12' deep ???!!! why so deep, for god's sake ?? i mean, they only need to reach the frost line. i don't imaging the frost line goes deeper than 6' in the north of Alaska, much less anywhere else.

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