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Unread 06-08-2021, 03:13 PM   #1
nafreire
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Waterproof concrete porch - Help

I live in Toronto, Canada. I have a small concrete porch that I need to waterproof because it has some small cracks that let bits of water into my cold room. The plan is to waterproof and then cap the porch with Banas’s stone.
Should I use Ditra with the Canadian weather? Or would Kerdi be a better option? Any issues with water getting under the stone with the weather in Canada? The majority of the porch is covered but the front 2 feet. I do have a proper slope for water runoff.

Thanks
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Unread 06-08-2021, 05:42 PM   #2
jadnashua
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Probably neither Ditra or Kerdi are your best choices for outdoor waterproofing. Noble has some membranes specifically made for that. Schluter does have a method to use their products for outdoor waterproofing...check their installation handbook on the website.
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Unread 06-08-2021, 08:30 PM   #3
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Is the Mapei Mapeguard 2 Membrane Crack-Isolation a similar product to Noble deck?
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Unread 06-08-2021, 11:26 PM   #4
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Not the same...from the technical data sheet of the Mapei product mentioned:
"Do not use on vertical surfaces, under glass tile
installations, or as a roof deck membrane or wear
surface."

IOW, not designed for what you want.

https://www.noblecompanyonlinestore....rack-isolation
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Unread 06-11-2021, 01:19 PM   #5
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just did a webinar yesterday on decks...
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Unread 06-11-2021, 03:12 PM   #6
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And you have not linked to the webinar here because...?
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Unread 06-11-2021, 03:49 PM   #7
cx
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Welcome, Nuno.

If you don't add that geographic location to your User Profile the information will be lost before we leave this page.

I think you'll find NobleDeck to be unique in its class. The only membrane I'm aware of that's indicated as a single waterproofing layer over raised decks above occupied space.

I'd wanna know more about the structure of your above-grade slab to know whether you're likely to be successful with a natural stone installation, but the NobleDeck would likely be my recommendation.

My opinion; worth price charged.
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Unread 06-17-2021, 07:18 AM   #8
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Nuno,

What you will need is called a 'primary waterproofing membrane', which is essentially a roofing type membrane, since that patio slab is serving as a roof in a way to that two feet of space beneath it.

Noble would be a great company to reach out to if you want to keep the layers as thin as possible. As CX mentioned, they have a membrane for this that can be tiled over directly. Otherwise, you will need a primary membrane, drainage mat, reinforced mortar bed, secondary waterproofing (Aquadefense or the like) and then tile and grout. This creates quite a thick sandwich of materials, so you may want to give Noble a ring and see how hard it will be to get your hands on their product in your area.
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