Installing Granite Counter - Plywood Needed? - Kitchen & Bath Remodeling - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Remodeling > Kitchen & Bath Remodeling


Thread Tools
Display Modes
Old 03-31-2009, 02:06 PM   #1
Join Date: Mar 2009
Posts: 1
Rewards Points: 10

Installing Granite Counter - plywood needed?

I am going to install a prefab granite counter (5 ft long) over two 1 ft. wide drawer stacks. This will leave a three foot area in the center to create a desk. I've read a lot online and some postings insist on plywood under the granite. Some insist plywood is not necessary. I am worried if I don't use plywood, the 3 ft unsupported section will crack. Also, some postings recommend using metal rods to further support granite. How does this work and where would I get the rods?

I thought this would be a simple DIY but now I'm confused. Any words of wisdom?
cwdiy is offline   Reply With Quote
Sponsored Links
Old 03-31-2009, 04:16 PM   #2
Remodeling Contractor
Join Date: Dec 2008
Location: Sandy Hook, CT
Posts: 3,590
Rewards Points: 2,000

12" overhang is okay with a granite slab. 36" opening is too much. on the back side add a 2" X 4" angle iron. You can find these as stock items at a mason yard (used for headers in brick and stone work). On the front just use a 1/4" flat steel plate. rods... get threaded rods at electrical or plumbing stores. (not very strong)
Bob Mariani is offline   Reply With Quote
Sponsored Links
Old 04-18-2009, 07:04 AM   #3
Join Date: Sep 2008
Location: SoCal
Posts: 1,802
Rewards Points: 1,016

Some of your confusion and varying recommendations may come from this... Granite slabs in the West are usually 2cm (3/4") and in the East 3cm (1 1/4"). With the 2cm having 1/2" plywood underneath for added strength and then having a overhanging edge applied that is about 1.5" thick that covers the plywood from view. The 3cm is laid without plywood directly on top of the cabinets and with no overhanging edge applied. Which way is better? Neither methinks, it's a matter of preference as to the appearance.

That said, depending on if 2cm or 3cm you need plywood if 2cm. And I would think with either 2cm with plywood or 3cm without, additional reinforcement would be recommended for a 3' span.

I would confer with the vendor where you are getting the pre-fab granite for their recommendation on how best to accomplish the installation.
vsheetz is offline   Reply With Quote
Sponsored Links


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
Stonemark & Silestone Countertops......??? DepotDweller Remodeling 11 01-03-2018 05:33 PM
installing granite counter ponch37300 Kitchen & Bath Remodeling 2 02-04-2009 12:10 AM
Installing a Granite counter top DaleB General DIY Discussions 2 03-13-2008 07:10 AM
installing granite counter tops dnassif Remodeling 4 07-01-2006 08:37 AM

Top of Page | View New Posts