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Unread 06-21-2008, 11:36 AM   #1
cfell
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Preslope variation... questions...

Does the preslope have to be the same thickness around the perimeter or can I increase the thickness on one end (such as an unlevel floor or to encase some plumbing)?

In one case the plumbing is wrapped with the closed cell foam and 4 mil plastic.

On the other, the concrete slab is low on one end and the walls shimmed to level...sooooo...

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Unread 06-21-2008, 11:54 AM   #2
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Channing,

What kind of variances are you dealing with? Regarding function, the slope needs to be a minimum of 1/4" per foot. Aesthetically, it's preferred to have the floor meet the walls at the same level throughout the perimeter.

If I read your post right, I would suggest building your preslope the thickness needed to accomodate whatever obstruction / void you're dealing with, and continue that profile around the shower floor???
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Unread 06-21-2008, 07:53 PM   #3
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The pre-slope doesn't have to be pretty or the same thickness throughout. You just want the drain to be the lowest spot and a slope of about 1/4" per ft. The final deck-mud has to be level around the perimeter and hopefully about 1 1/4" thick or thicker.

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Unread 06-22-2008, 08:40 PM   #4
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yeah, that should be great, thank you gentlemen..

I've ended up with almost 2 nches at perimeter "to keep things even"... tapering to the drain.

It's been curing about 30 hours and looks very tight. I did "scrape" the surface to smooth all raised edges... (my son was helping me and insisted "it's fine"..) and for about 85% of the surface, he was right.

I spent the rest of the weekend installing the vanity, resurfacing the walls, etc.

When I begin the final slope, I'll be tapering the slope a bit so the edge is about 1/2 inch... and a little thicker at the center... I hope that plan is a workable one...
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Unread 06-23-2008, 06:22 AM   #5
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The final slope is the same thickness from wall to drain.
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Unread 06-23-2008, 07:06 AM   #6
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bummer..... well, thanks for clearing it up for me...
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Unread 06-23-2008, 08:06 AM   #7
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Channing, let me know if I'm readying your posts right - while your pre-slope is up to 2" thick, your "final slope" over the liner at the perimeter is only 1/2" thick (post # 4). If that is the case, 1/2" mortar thickness over the liner is not enough. It needs to be more than that, more mass to hold together. We recommend 1-1/4" thickness for the final mortar bed. For more information on that, see the Shower Construction thread in the Liberry, John's post #2 here. http://johnbridge.com/vbulletin/showthread.php?t=5434

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Unread 06-23-2008, 09:24 AM   #8
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The final slope do not have to be the same thickness everywhere. That is ONLY if the preslope was installed perfectly, but even then you can tweek it a bit.

I agree with Mike, your proposed final thickness is too thin. You should have made the preslope thinner if t total height was the issue. It doesn't matter if the preslope cracks, but you don't want that in the final mud bed.

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Unread 06-23-2008, 10:00 PM   #9
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Howdy, guys!

I see the point. I need to have enough thickness over the liner to minimize flex of the Final slope.. for that a minimum of 1.5 inches is recommended... the thicker, the more flex resistant and stable. Right?
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Unread 06-23-2008, 10:09 PM   #10
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You got it.
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