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Unread 06-17-2013, 01:26 PM   #1
rdflinn@gmail.com
David
 
Join Date: Jun 2013
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Master Bath Upgrade Project

Hi,

I've been lurking for a while and enjoyed all the information but I've got one big question that has me confused. I've gutted and replaced the subfloor in my old 1926 colonial 2nd floor bathroom. The tub is in and I'm about to hardibacker (after plastic) the tub/shower area.

My main question is on the floor ... I'm installing Warmly Yours radiant heat and I am now leaning towards using SLC over the heating mat and Phil Green's slick Edge Strip kit. But ... the question is ... do I still need the 1/4 hardibacker under the WY mat? Their instructions are vague on this topic.

I've got the following:

16 " on center joists (8")
3/4 " T&G plywood subfloor
1/2 " Exposure 1 plywood underlayment

Do I do this:

thinset coat
1/4" hardibacker
SLC primer
WY heating mat
SLC

or this:

SLC primer
WY heating mat
SLC

I'm planning on 12" mosaic basket-weave tile with a fancy marble border to go on top (3/8" thick).

Thanks!

david
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Unread 06-17-2013, 02:12 PM   #2
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Welcome, David.

I don't believe Warmly Yours cares at all about the CBU under their product, but the SLC manufacturer may have different requirements for metal or plastic lath reinforcement depending upon what's under it. Can't tell what you intend to use.

I'd like that floor a lot better, especially for natural stone tile, if it weren't all cut up in short little pieces like that.

Did you evaluate your joist structure in light of the stone installation?

My opinion; worth price charged.
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Unread 06-17-2013, 02:24 PM   #3
rdflinn@gmail.com
David
 
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Question

Hi,

Yeah, I had a squeaky floor issue and had to cut it out and repair with some additional blocking. Passes the jump test!

The joist structure is sound and gives a 740 deflector test. There was mosaic tile before (over linoleum), so by replacing the subfloor and underlayment, it appears to be really solid, especially after all the additional blocking I added.

As per the SLC, for example, Henry recommends the metal lath, but it appears that the radiant heat mat also is a "lath" so it appears to work without metal lath.

Perhaps another layer of 1/2" underlayment would be better than the 1/4" hardibacker?
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Unread 06-17-2013, 05:14 PM   #4
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yes, only considering the 'between joist' deflection
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Unread 06-17-2013, 09:33 PM   #5
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David, if you already have two layers of subflooring, you don't need a third. The CBU is helpful in that it is a more friendly surface for the SLC, which is why some manufactures wave the reinforcement requirement if pouring over CBU rather than plywood.

My opinion; worth price charged.
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Unread 06-18-2013, 06:00 PM   #6
rdflinn@gmail.com
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Hi,

Okay ... I've decided I'll just go for the 1/4" Hardi. Once that's down and the WY heating mats are glued down, I'll decide on SLC or just the Flexbond thinset I was planning to use.

Now ... 1/2" Hardi going up in the tub/shower!
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