DIY Chatroom Home Improvement Forum

DIY Chatroom Home Improvement Forum (
-   Flooring (
-   -   Advantech or Plywood? (

remoder 09-28-2012 01:07 PM

Advantech or Plywood?
I'm currently in the process of replacing the entire subfloor in a ranch style home. I have removed the 1/2" plywood subfloor and 5/8" particleboard underlayment. The finished flooring will be carpet, linoleum sheet/vinyl tile (glued) and engineered wood flooring.
The house sits on doubled and tripled 2x8 girders and 2x8 joists with a span of 7'-9'.
I wish to use one single layer of 3/4" subfloor without underlayment due to the cost of 1350 sq ft. plus two additions totaling 570 sq ft.

I have four questions:

1a. For my above information of desired flooring is a single layer adequate?

1b. Is Advantech or Plywood better suited for my desired use? The Advantech is cheaper.

One of the additions will be over a concrete slab that juts out 9 1/2' that is 4"-4 1/4" lower than the main house. This will be the Dining room extension to total 15 1/2' so the two floors will need to be an equal height. This room will receive engineered wood. I plan to build this up with treated lumber and foam board for insulation.

The other addition will be a Master bed/bath on an enclosed carport with slab.


2a. What should I cover the dining room slab with initially?

2b. Will it be okay for the slab to be as is in the crawl space of the Master?

Ed911 09-28-2012 06:15 PM

What is the spacing on your floor joists.

I just put Advantech in my bathroom...and highly recommend it. If you have any questions, check out their website. Just remember to glue and screw it, if you decide to use it, and remember to block in around the edges. Here's the link

I called their customer service dept when I was thinking of using it, and they were very helpful. 1-800-933-9220 Advantech customer service.

BTW, my floor joists are on 16 inch centers and my experience is that with floor joists on 16 inch centers, you should be able to use only the the Advantech. Advantech is very stiff and has really good moisture resistance guaranteed not to swell or delaminate for 300 days when exposed to moisture. I used a piece of Advantech across a couple of saw horses and left it outside for the last six or eight months...other than being gray from being out in the rain and sun, it still retained it's original, it's got my vote for durability.

I would use it again, and if it's cheaper than the plywood that you're's a no brainer. Anyway, call Advantech customer service and let them know what you're doing...and see what they say.

As for your cannot put untreated wood directly on both are porous and will wick moisture.

Hang on, I'm sure you'll hear from other commenters. There are a lot of good, experienced people here.

joecaption 09-28-2012 07:48 PM

Advantec is a great product and have never once used plywood as a subfloor since I discovered it. Far more stable and water resistant.
I've gone so far as proffing to a customer how much better it is. I took a piece of 3/4" plywwod and a piece of Advantec drilled a hole in each and attached a piece of rope and threw both off of his dock. A week later the plywood was a mess and had all but fallen apart. The Advantic still looked like new.
But there's no way your going to be able to lay linolium over it, it's needs 1/4 A/C underlayment rated plywood over it.

remoder 09-28-2012 08:13 PM

Doh! The one item I left out. Yeah they're 16" centers. And after thinking about the glued linoleum a bit that does make sense due to the wax.

Hopefully someone will be able to steer me in the right direction on the moisture barriers. I had a link for a method but lost it. I believe it was - Ditra? then the treated lumber got Tapcons and rigid foam in between and subfloor on that.

The crawl space slab I just have no clue about. But I want the floor even with the entire house. I've already raised the sunken living room floor. So all floors not on the same level is not an option for the wife.

JazMan 09-28-2012 08:15 PM

Hi all,

I agree with Ed & Joe, Advantech is a good choice.

As mentioned, you're ok for carpet with padding and most likely for the engineered wood, but vinyl needs an underlayment.

Again I agree you do not use pressure treated indoors, ever, plus building a "sleeper" floor is not a recommended procedure because it often fails. If the ground contains moisture (it always does), it'll wick up to the concrete, where will the moisture go if you cover it?


remoder 09-29-2012 06:00 AM

With a good barrier the treated wood is not needed anyway. Forgot about the off-gassing of the treated lumber. The slab the sleeper floor will be installed on is not resting on the ground but approximately four feet above. I do realize there is also moisture in the air and the slab will still sweat. However I don't think it will be as much.

The slab in the crawl space hopefully will not be an issue but not sure.

JazMan 09-29-2012 09:52 AM


Originally Posted by remoder
With a good barrier the treated wood is not needed anyway. Forgot about the off-gassing of the treated lumber.

Although it may be a factor too, I wasn't thinking of the off-gassing. PT is very wet and needs to stay wet. When brought indoors it'll dry out causing it the twist and bend. The only time PT is recommended for indoors is if you use KD grade, I've never seen it.


remoder 09-29-2012 03:56 PM

Well I think I've found the barrier I will use. It's not cheap but I think it's the best option. Grace Ice and Water Shield over the slab then the sleepers, rigid foam, Advantech then finish flooring. The super sticky asphalt coating will seal the sleeper fasteners from allowing moisture in.

All times are GMT -5. The time now is 12:12 PM.

vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.

Search Engine Friendly URLs by vBSEO 3.6.1