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Old 06-18-2017, 08:16 AM   #1
Harry48
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Floating bench with SS supports

Needing advice/confirmation on mounting a floating bench. I have a 60x42” shower with Schluter’s Kerdi membrane and tiled with 12x24 porcelain tile (some cut shorter to fit shower dimensions), laid horizontal with 50% overlap. I have a 3 cm thick Silstone quartz slab 10x42” for the bench, and plan to mount it with a 1/2” gap from the back wall. The quartz bench will be supported at the ends by laying it on 8” long stainless steel angles (1-1/2 x 1-1/2 x 3/16”). Silicone will be spotted between the bench and SS angle to keep it in place. The SS angles will be mounted on the wall (over the tile) with SS lags or large screws anchored into a section of 2x12 mounted between the wall studs (see photo). I will likely screw a 42” piece of SS angle to the wall mounted SS brackets for added support under the midsection of the bench. The 2x8 is for a grab bar.
I’m looking for advice and/or confirmation to this approach. Also, any thoughts on how tight to screw the angles to the wall, not wanting to crack the tile or break the grout bond. Should I drill a hole through the tile significantly larger. Than the lag diameter so any weight on the bench does not push the lags onto the tile?
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Old 06-18-2017, 09:20 AM   #2
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From the way the post is worded I cant tell if you've already tiled or not. Personally I wouldn't want to be driving lags into the walls of my shower...
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Old 06-18-2017, 01:05 PM   #3
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Lags are hex headed bolts with screw threads. Yes, shower is already tiled and grouted.
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Old 06-18-2017, 01:34 PM   #4
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I think everybody knows what lag bolts are. I think he means he wouldn't want to put holes through the waterproofing of the shower. Frankly, neither would I, especially at the level you're doing it at and with the size of hole necessary.
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Old 06-18-2017, 02:23 PM   #5
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Not a problem with the holes......I will silicone the hole before and after inserting the lags.
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Old 06-18-2017, 05:29 PM   #6
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Silicone or not, lags are a bad idea in my opinion.
A few pics of what it currently looks like may help. Along with a diagram of what you plan to do about bracing, many of us are visual and pictures help.
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Old 06-19-2017, 12:38 AM   #7
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Harry. Your plan for the ss angle, ss lags sounds like it will work.

Did you put a lot of thinset behind the tiles in this area? I would worry about crushing the tiles and cracking them. I would rough up the inside surface of the angle and use silicon. Anything to help spread out the weight instead of relying on the lags. For sure drill the holes bigger than needed in the tile.

Just thinking here.
Maybe there is a way to attach the angle or a ledger with epoxy and not drill holes.
Just a thought, will surely get chastised here. Maybe use biscuits and epoxy to mount it. Can the bench go directly over a horizontal grout joint?

This would be titties. Remove grout at said joint, or wouldn't need to be at a joint. Cut a 1/8th inch notch on both sides of corner where the bench is going. Cut the same notch in the bench.
Stick lengths of ss stock in notch with silicon. Slide the bench in on this newly created rail.

Let the down talking begin.

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Old 06-19-2017, 03:47 AM   #8
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Quote:
Originally Posted by Travis
This would be titties.
A very forgotten but universally beloved phrase.
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Old 06-19-2017, 09:22 AM   #9
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Here is a drawing....it is missing the "cross piece" of SS angle that is shown in the second image. The two pieces of SS angle are just held in place for photo purposes....no screws holes yet.
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Old 06-19-2017, 10:08 AM   #10
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I was picturing a 45 degree corner bench.
Your setup will probably work.
I have seen plenty of grab bars installed this way. Just know when to stop cranking on the lags.

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Old 06-19-2017, 10:19 AM   #11
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Thanks Shady. Yes, can't tighten too much!!!, but needs to be snug. I am surprised how much weight there is for the bench. Quartz slab I guess is about 25 lbs, and SS angle about 15 lbs.

As for the silicone, it (as well as the Kerdi sealant by Schluter) are frequently used to seal holes and screw inserts through Kerdi membranes.....where soap dishes, other types of commercial benches, etc. are punched t hrough.
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Old 06-19-2017, 11:39 AM   #12
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I would like to see kerdi fix used in the holes, etc. I trust it way more than silicon. But it can be ugly if visible

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Old 06-19-2017, 04:49 PM   #13
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Kerdifix's bond strength can reach over 1400psi depending on the materials involved. Given enough surface area, it alone should hold your SS brackets in place...the screws or bolts would help hold it in place prior to it curing. The stuff cures at the rate of about 1/8"/day from the outside in.
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