Concrete Slab For Hot Tub - Concrete, Stone & Masonry - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Concrete, Stone & Masonry


Thread Tools Display Modes
Old 09-13-2012, 06:42 PM   #1
Join Date: Sep 2012
Posts: 1
Rewards Points: 10

Concrete slab for hot tub

We are building a 10' x 10' slab for our hot tub. It is 4" thick with 2 piles and no rebar. The hot tub weighs around 4200lbs with water. We're wondering if that should be enough to support the weight or should we build the slab thicker?


mattbreck is offline   Reply With Quote
Old 09-13-2012, 06:50 PM   #2
Civil Engineer
Join Date: Mar 2009
Location: Boston
Posts: 5,688
Rewards Points: 4,956

I don't get the part about the two piles. Is this a typo, or did you drive two piles into the ground to support the slab? As for support, a 4 inch slab should work fine provided it is properly supported by a suitable crushed stone or clean gravel base on adequately compacted and prepared soil. The concrete will be entirely in compression, which is the way concrete is strong, unless you have voids or compressible soil supporting the concrete, in which case you will have serious trouble.


Daniel Holzman is offline   Reply With Quote
The Following User Says Thank You to Daniel Holzman For This Useful Post:
mattbreck (09-13-2012)
Old 09-15-2012, 12:12 AM   #3
World's Tallest Midget
Mort's Avatar
Join Date: Nov 2008
Location: Seattle, WA
Posts: 1,412
Rewards Points: 694

^^^ What he said. Four inches of compacted gravel should do the trick.

And for extra credit, you're looking at about 1.25 yards of concrete.
Mort is offline   Reply With Quote

Thread Tools
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
Concrete Basics for the DIYer Mort Concrete, Stone & Masonry 7 11-22-2012 11:19 AM
concrete porch slab questions Queso Bandit Building & Construction 2 06-29-2011 10:31 AM
Fix or Replace Porch Concrete Slab Majoram Building & Construction 10 06-25-2011 02:45 PM
Help stone over concrete slab Johnnyquest Flooring 0 05-20-2011 03:36 PM
Concrete slab to foundation work tntgarv Building & Construction 3 02-28-2010 12:23 PM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1