Non-Frost Resistant Slate In Frost Area - Is It Possible? - Flooring - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Flooring


Thread Tools Display Modes
Old 10-23-2010, 09:09 PM   #1
Join Date: Oct 2010
Posts: 22
Rewards Points: 40

Non-Frost Resistant Slate in frost area - Is it possible?

We are tiling our front porch (11'x18') with a pattern of 6x6, 12x12, and 24x24 slate from Home Depot. We have 3/4" plywood on 12" centers I think. I'm going to lay down 1/2$" backerboard and a layer of Ditra. The porch is covered, but the sides are open, so it will get wet and some snow.

We live near the southern part of Va and temps are already starting to dip near the 30's at night. I was planning on sealing the stone with Quikrete Natural Look Waterproofer:

We got the slate in and they are generically labeled "Premium Natural Stone - Gauged Classic".
On the 12x12 slate there is a big sticker "Non-Frost Resistant Slate".

So I'm starting to worry that I may be heading down the wrong path. I see people using slate all the time for outdoor projects.
Did I simply pick the wrong type of slate? Should I stop now and select another type?
With proper sealing, should I be ok?


mrlegoman is online now   Reply With Quote
Old 10-23-2010, 10:10 PM   #2
JazMan's Avatar
Join Date: Feb 2007
Location: Troy, Michigan
Posts: 5,860
Rewards Points: 422

You've selected the wrong materials for outdoor use if there's a possibility for below freezing temps. Even some slates that are not labeled "non-frost resistant" may only resist for a number of cycles. After that you can vacuum the pieces.

You should find a real porcelain tile that claims an absorption of .05% or less. Plenty of slate looking porcelain tiles out there.

We always want two layers of plywood totaling 1 1/4" as a base when installing natural stone. The concrete backer does not add anything to the structure except height. Ditra is a good choice if all the other requirements are met. It would also be nice if you had a slopped substrate for water run off.

The other spec to keep in mind is the joists' deflection rating. Natural stone requires much stiffer joists (L720) than porcelain and the normal home construction norms. (L360). Let us know; the type and size of the joists, their condition, species and grade, double check the on-center-spacing, measure the span from support to support.

Sealing the installation will not make the installation waterproof, it'l just make it easier to maintain. Water will get in thru grout and hair line cracks.



TILE GUY - retired- TROY, MI - Method & Product suitability consulting.

JazMan is offline   Reply With Quote
Old 10-23-2010, 10:22 PM   #3
Join Date: Oct 2010
Posts: 22
Rewards Points: 40

Thanks for the quick reply Jaz. I'm heading to the house site tomorrow and I will double check all the dims of the support structure.

I'll also talk to the boss (wife) and see of she'll accept something other than a natural stone.

Will post what I find tomorrow. Thanks again.
mrlegoman is online now   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
Insulating furnace/utility area cbrc5eric Building & Construction 3 04-30-2010 12:03 PM
Slate under cabinets? CCP Remodeling 2 03-09-2010 03:57 PM
Outdoor Seating Area JackOfAllTrades Landscaping & Lawn Care 10 02-05-2010 02:01 PM
Advice and help on slate floors adamsela Flooring 1 10-04-2006 04:23 PM
help Chuckman Off Topic 8 06-15-2006 10:06 PM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1