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Unread 05-12-2013, 11:24 AM   #1
gueuzeman
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Kerdiboard fastening- screws

Having trouble locating a galvanized fastener in local shops that has a flared underside to the head like the (expensive and hard to get) Schluter ones.

I''ve just been using exterior deck screws, which work fine, bt the heads don't seat in thye kerdiboard washers as snug. Seems to be made for the shape of a standard drywall screw.

I know, I know, but here's my theoretical question- So on a traditional kerdi install, you hang drywall with drywall screws, right? And the screws are protected, so it's ok, right?

So if I'm protecting the washer and fastener on the kerdiboard, and it's never going to get wet, why can't I use a non-corrosion resistant screw?

And no, I will not be k-banding, but either urethane caulk or 2 coats hydroban.

Currently using ceramic coated deck screws, and happy to continue doing so, just wondering out loud.

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Unread 05-12-2013, 11:32 AM   #2
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Same feeling, and same method here. But I use sheet rock screws, the thicker ones. Don't know size of screw it's 1 1/4" x ? thick, I just buy the huge plastic box with handle. Wedi sausage tube the tabs, then might hit the bigger ones with a coat of Hydroban to give the smooth urethane some tooth.
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Unread 05-12-2013, 11:42 AM   #3
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Wouldn't bother me at all, Gueuze, but you won't win any arguments if you have a failure of any kind.

You can get galvanized drywall screws, too, which might make me feel a bit better about it.

I've not tried decking screws on Kerdiboard, but I can see the heads being too thick to work as well as drywall screws or KerdiBoard screws (which look to me like galvanized drywall screws).
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Unread 05-12-2013, 12:03 PM   #4
gueuzeman
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Couldn't agree more, CX, as manufacturer's directions override industry standards, as the uncoupling/crack isolation debate shows. eh?

The deck screws work fine, and are available . I'm glad to hear that there are galvanized drywall screws. If I can locate some at a reasonable price I may get some.

In the meantime I'll save my drywall screws for the electrical boxes.

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Unread 05-12-2013, 02:52 PM   #5
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I don't have any problem with drywall screws which have had waterproofing applied over them.
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Unread 05-12-2013, 03:27 PM   #6
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we normally use the backer on screws since they are handy
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Unread 05-12-2013, 06:10 PM   #7
John K
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For what its worth I use 1 5/8 sheet rock screws with the Wedi board washers. If water gets through I am up a creek without a paddle anyway, which would negate the type of screw I used.

Not to mention who is really looking to call in a manufacturer when the installation doesn't follow their guidelines to a "T". (ie, Hydroban on Kerdiboard with a little side of Greenskin and topped off with some modified thinset.
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Unread 05-12-2013, 08:32 PM   #8
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I'm with John, my local daltile doesn't sell the schluter fasteners in bulk; however, they do carry the large buckets of wedi screws and washers which we use for kerdi
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Unread 05-13-2013, 06:03 AM   #9
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galvenized drywall screws...

We have a few sheets to attach to 20 gauge steel... we found 1 5/8 zink self tappers
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Unread 05-13-2013, 06:20 AM   #10
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I use cement board screws with the kerdi washers when I use kerdi board.
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Unread 05-13-2013, 08:32 PM   #11
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I used leftover kerdi screws to fasten my outlets on my backsplash todayhahahahhaah....lol-im kidding!!
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Unread 05-14-2013, 05:21 AM   #12
bctile601
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I use the gray 1 5/8" deck screws on Wedi washers.

I keep 2 1/2" and 1 5/8" in bigger boxes on the truck, and have a small box of 1 1/4" and 2".


Fasten cement board with them, studs together with them, HydroBan, Wedi, Aquadefense, Kerdi

Whatever
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Unread 05-28-2013, 03:43 PM   #13
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I use tabbed washers from warehouse bay (item No: 30-40700), identical to Kirdi washers, and $24 for 500. They have coated screws as well!
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Unread 05-28-2013, 04:25 PM   #14
jadnashua
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At a recent workshop, they discussed the difference between waterproof and vaporproof...while the perm rating of Kerdi (or Kerdiband) is in the order of 0.78, it is waterproof...Kerdifix is not the recommended covering for the screws/washers on KerdiBoard. Long term, will it matter? Probably not, but it could.
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Unread 05-28-2013, 06:09 PM   #15
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Grabber Construction Products:
http://www.grabberman.com/CatBrowser...oC8ss13%2F8%3D

Rodenhouse Washers & Fasteners:
http://www.rodenhouse-inc.com/
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