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Old 08-29-2012, 01:47 PM   #1
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Pre-cast concrete blocks for deck?


I'm tearing down my existing unsafe deck & replacing it.

The existing deck extends 10' off the house (supported at the house end by a ledger) & is supported at the other end by 4x6 beams which are, in turn, supported by 4x4 posts that sit on pre-cast concrete pyramid blocks. The deck is also 10' off the blacktop underneath.

I live in WA state, so we don't get hard freezes. Are these blocks enough support?

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Old 08-29-2012, 02:00 PM   #2
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Pre-cast concrete blocks for deck?


Not ever going to meet code any place I've ever lived.
Might be fine in some places for a ground level deck.
How do the 4 X 4's come into play?
A deck that high needs 6 X 6's.

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Old 08-29-2012, 02:27 PM   #3
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Pre-cast concrete blocks for deck?


mdalli,

check out this link for the "Prescriptive Residential Wood Deck Construction Guide." http://www.awc.org/publications/DCA/DCA6/DCA6-09.pdf

if will provide a lot of information for code compliant deck construction.

Washington State Residential Building Code (state amendments to International Residential Code) can be found here https://fortress.wa.gov/ga/apps/sbcc/Page.aspx?nid=14
online access to International Residential Code can be found here http://publicecodes.cyberregs.com/ic...2009/index.htm

you'd need to talk with your building official to determine if you have a frost depth your footing/foundation for the deck must meet, and if permits are required. You may be able to get them to meet you at your site to see what you have and give you some advice.

Now to your question. Not knowing the soil bearing capacity of your soil, or the size of the concrete blocks it is difficult to say if they can properly support the code imposed loads or not. Evaluations such as this typically requires "eyes on the site." you are there so you can see everything, unfortunately we are here and cannot. Photos, however helpful, are not the same as being there.

Sorry I cannot answer your question, but hopefully I have pointed you in the direction to get the answers you need.

Good luck!
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Old 08-29-2012, 05:12 PM   #4
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Pre-cast concrete blocks for deck?


Quote:
Originally Posted by joecaption View Post
Not ever going to meet code any place I've ever lived.
Might be fine in some places for a ground level deck.
How do the 4 X 4's come into play?
A deck that high needs 6 X 6's.
The 4x4s are what I'm removing. Trust me, the whole old deck is a case study in what NOT to do. We moved in less than a year ago, this is the 1st major project of many.
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Old 08-29-2012, 11:45 PM   #5
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Pre-cast concrete blocks for deck?


My first inkling would be to say no. I'd go with a footing below the frost line (18" in Seattle), and a sonotube full of concrete, in a mono-pour. Those links above should tell you more, though.
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