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-   -   Building a deck on a concrete patio. (http://www.diychatroom.com/f19/building-deck-concrete-patio-99915/)

Leon H. 03-29-2011 02:00 AM

Building a deck on a concrete patio.
 
I am building a small deck (3 x 8) attached to the house over a concrete patio. How do I secure the posts that will hold the deck to the concrete patio?

stadry 03-29-2011 06:13 AM

if you need more than gravity, there are angle clips you can get at the apron store that will hold your posts off the conc & attach w/lead shields & lags.

Just Bill 03-29-2011 07:23 AM

If you are in the northern half of the country, that patio should not be used for support. Your footer supports should be below frost line, which means breaking a hole in the patio and pouring a footer. The deck can be either free floating and rest on the patio, or attached to the house with footer supports.

Bondo 03-29-2011 09:09 AM

Quote:

Originally Posted by Leon H. (Post 619062)
I am building a small deck (3 x 8) attached to the house over a concrete patio. How do I secure the posts that will hold the deck to the concrete patio?

Ayuh,... If you're in a northern climate, Don't attach it to the house,...
When the concrete heaves with frost, it's rip it off the house...

Daniel Holzman 03-29-2011 09:25 AM

The point about the footers is correct, you do not want to attach posts to a floating slab for a variety of reasons. First, the frost heave as noted. Second, the slab may not be strong enough to support the load. So you need to do as suggested by a previous post, namely break through the concrete and install footers to size and depth as per local code.

DrHicks 03-29-2011 11:39 AM

Quote:

Originally Posted by Leon H. (Post 619062)
I am building a small deck (3 x 8) attached to the house over a concrete patio. How do I secure the posts that will hold the deck to the concrete patio?

What these other guys have said - about NOT attaching it to the house and the strength of the floating slab - is true.

However... A 3x8 deck is pretty darned small. It's more like a raised walk-way. I'm curious about it. Why are you building it? How high, etc.?

Also, are you wanting this to be a "Holmes on Homes" kind of job? Or are you happy to have it be "decent" because you'll be doing something else somewhere down the road?


If you're looking for good but not holy cow awesome, you can affix your 4x4 posts to the concrete slab. Heavy brackets can be had for $10-$15 each at any HD or Lowes or Menards. Again... That wouldn't be the ideal way to do this (probably) but it'll work.

dtsman 03-29-2011 12:13 PM

Not enough info.
A simple 3ft by 8ft deck.

Is this a 1st floor deck just to cover the concrete, or is it a second story deck?

1st floor deck, just attach it to the house or the slab, but not both so it can move. Hammerdrill and lead anchors.

2nd floor deck, You can either connect with a galvanized flange that is designed to bolt to the slab and then you set your post in it, these are found at HD, and all the others.
It is not out of the question to just pin it either. Anchor a galvanized or stainless bolt or rod in the slab, cut the head of the bolt off, drill a hole in the bottom of the post and set the post on the pin. This prevents the post from being knocked out when hit by a lawn mower or something. Perfectly legal in VA and KY.

Bo

Remember,
If the women don't find you handsome,
they should at least find you handy.
(Red Green)

Leon H. 03-29-2011 02:11 PM

small raised deck (step out)
 
Quote:

Originally Posted by DrHicks (Post 619218)
What these other guys have said - about NOT attaching it to the house and the strength of the floating slab - is true.

However... A 3x8 deck is pretty darned small. It's more like a raised walk-way. I'm curious about it. Why are you building it? How high, etc.?
I'm building it as a step out for a sliding patio door. It is about 2ft. off the patio.
Also, are you wanting this to be a "Holmes on Homes" kind of job? Or are you happy to have it be "decent" because you'll be doing something else somewhere down the road?
Decent. It will not be inspected. I just want the 4x4 posts to not be "floating" on the cement patio.


If you're looking for good but not holy cow awesome, you can affix your 4x4 posts to the concrete slab. Heavy brackets can be had for $10-$15 each at any HD or Lowes or Menards. Again... That wouldn't be the ideal way to do this (probably) but it'll work.

Sounds good enough for my use.

DrHicks 03-29-2011 02:23 PM

Quote:

Originally Posted by Leon H. (Post 619319)
Sounds good enough for my use.

I remain intrigued.

Why those dimensions? Is this like a handicap ramp?


Just curious - and I know it's none of my business. :)

Leon H. 03-29-2011 04:21 PM

Quote:

Originally Posted by DrHicks (Post 619322)
I remain intrigued.

Why those dimensions? Is this like a handicap ramp?
No. It is up against an 8 ft. wall and it comes out 3ft from the sliding patio door.(not 2 as I think I said earlier). Then I have two steps coming down from it.

Just curious - and I know it's none of my business. :)

thanks for the interest.


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