Out Door Concrete Slab For Hot Tub - Building & Construction - DIY Chatroom Home Improvement Forum
Advertisement


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Building & Construction

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread
Display Modes
Old 06-26-2010, 06:59 AM   #1
Newbie
 
Join Date: Jun 2010
Posts: 1
Rewards Points: 10
Default

Out door concrete slab for hot tub


I live in northwestern CT and want to pour a 9'x9' concrete slab for a hot tub, do I need footing below the frost line?, or just 6-8" crushed stone and re-bar enforced 6" slab. Any help would be greatly apreciated Thank Eric
catfish1 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 06-26-2010, 07:53 AM   #2
Concrete & Masonry
 
Join Date: Nov 2008
Location: Wisconsin
Posts: 3,786
Rewards Points: 518
Default


I generally drill & pour 4-5 sono tubes under the pad to play it safe. Frost shouldn't get too deep under a hot-tub, as they do loose some heat & help protect the ground under them from frost. If you're sure that the ground is hard enough, you can probably get away with just the gravel base and slab on grade. If concerned yet, you could probably put some rigid foam on the ground around the perimeter of the slab for a little extra protection.
jomama45 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 06-27-2010, 07:12 AM   #3
Member
 
Join Date: Jun 2009
Location: atl & hilton head
Posts: 6,640
Rewards Points: 3,564
Default


in northern ny ( binghamton ), we placed ours on 6" crushed stone, 6" pad of conc, & 2" of foam,,, typical frost depth was 4' but only everywhere else,,, under the tub it never got below 50f ( left a remote thermometer under the tub )
stadry is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 06-27-2010, 11:11 AM   #4
Member
 
Knucklez's Avatar
 
Join Date: Oct 2007
Location: ontario canada
Posts: 1,120
Rewards Points: 1,002
Default


i never hear people talk about the ground grid that is supposed to be installed under the tub. any help on this issue?

does your tub sit no the 2" of foam? if so, maybe the cement is NOT warmed by the tub and so frost could be a real concern?

i would be leery of putting sonotubes under a slab. the slab which is NOT directly over the sonotubes could be forced up due to the frost heave, but the slab that IS over the sonotube (and tied in with rebar) would not move. this will crack the slab. i would rather have the slab floating (over crushed stone etc.) so that it all moves together.

Knucklez
__________________
"if you can't be handsome, at least you can be handy" -Redgreen
Knucklez is offline   Reply With Quote
Old 06-27-2010, 02:12 PM   #5
Member
 
Join Date: Jan 2009
Location: South of Boston, MA
Posts: 17,248
Rewards Points: 2,000
Default


My last house the tub sat on a dug out area that I filled with concrete rubble, about 12" deep
Then I poured 2-3" of cement over it just for a level surface
Never moved in 5-6 years

This house the 1st tub is ona slab that is anywhere from 8-20" thick
Also partially filled with rubble....hasn't moved in 6 years

My 2nd tub was simply installed over levelled concrete pavers 4-6" deep
These were maybe 24" square
Its been there 3 years now



Scuba_Dave is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pouring Patio Slab and Post Footings Question average_male Building & Construction 22 04-04-2016 12:13 PM
engineer wood floor @ uneven Slab on grade gtimk4 Flooring 0 03-21-2010 06:29 PM
Concrete slab to foundation work tntgarv Building & Construction 3 02-28-2010 12:23 PM
Extending Concrete Patio Slab bobo Building & Construction 6 04-17-2008 12:17 PM
Filling hole in carport (concrete slab) chaddihimself Building & Construction 2 08-10-2007 12:50 PM




Top of Page | View New Posts