Return to the Porches & Decks Forum | Post a Follow-Up

 o
deck addition - how low to ground?

Posted by rhomy (My Page) on
Thu, Jul 3, 14 at 14:54

I have an area of approx. 10' x 15' wide to connect my existing deck to a house addition with porch.

My question (barring any local codes which I will check into) how low can I go with deck? I will use pressure treated wood for continuity. Ground slopes so that a patio would require fill-in dirt.

Will ground level or up to say 8" above ground level create any problems? What would be best ground preparation for this?
thanks!


Follow-Up Postings:

 o
RE: deck addition - how low to ground?

You need ventilation under a deck to avoid moisture-caused problems (insects, mildew). If there's 8" clear under the joists, that should be ok. If you want the surface of the deck to be 8" up, then you'll have virtually no real clearance/ventilation, so I wouldn't go that way.

How steep is the slope? If it's steep, then the outside of the deck would be much higher off the ground, and that would give you enough ventilation. If the deepest it gets is 8" then I'd level it out and pour a patio.


 o
RE: deck addition - how low to ground?

8" is lower than I would go. The area is about 15 inches on one side to 40 inches on the other. This spans about 18 feet.
My consideration is a step down deck rather than one going evenly across, and stairs. I have a faucet that I would prefer not to move or raise.

Thank you for the information. (a crude drawing included)


 o
RE: deck addition - how low to ground?

15-40" off the ground is fine.


 o
RE: deck addition - how low to ground?

Thanks!


 o
RE: deck addition - how low to ground?

Keep it high. Build some storage bins underneath to stash junk.


 o
RE: deck addition - how low to ground?

Thank you OldFixer, but I prefer to be rid of "junk" :)


 o
RE: deck addition - how low to ground?

We had two decks in our back yard connected with boards like a bridge and it was built around existing trees. It was as low as we could go. One place I could put bricks to keep opossums out other place is was touching the ground.

Beware of treated wood. The previous treated board had arsenic in it and it was dangerous to children. They stopped using it, don't know what it is treated with now. I would use red wood if possible, ours was redwood.

This post was edited by EmmaR on Sat, Jul 12, 14 at 16:06


 o
RE: deck addition - how low to ground?

Very nice EmmaR! I like the lush feeling and pond.

I have a treated wood deck that is 20 yrs old; I don't know if I could afford to replace it with the additional deck. Something to definitely check into!


 o
RE: deck addition - how low to ground?

Thank you............

You need to be careful of the deck if treated wood was used. They don't make it anymore. Kids are more vulnerable than adults plus they sit on it and crawl around on it. Yours may have arsenic in it. The instruction when handling it was to wear gloves when touching it. They can't use arsenic anymore.


 o
RE: deck addition - how low to ground?

"You need to be careful of the deck if treated wood was used. They don't make it anymore. "

????
http://www.familyhandyman.com/decks/comparing-deck-wood-cedar-pressure-treated-wood-composite-decking/view-all

Here is a link that might be useful: decking


 o
RE: deck addition - how low to ground?

Pressure treated wood is most definitely still available. They have stopped producing CCA pressure treated and moved on to another chemical that the name escapes me of at the moment. This new material is allegedly safe (but CCA was considered safe at one time as well).


 o
RE: deck addition - how low to ground?

I would put a heavy black poly on the ground and cover that with pea gravel or other small stone. In all likelihood you will not be going under there, but a little careful ground prep is nice. In a pinch, you can look and see what is going on under the deck.


 o
RE: deck addition - how low to ground?

Thank you millworkman and Jackfre.


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Porches & Decks Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here