(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 3 of 3

Thread: Backer board for shower grab bar (fiberglass surround)

  1. #1
    DIY Junior Member penobscotman's Avatar
    Join Date
    Mar 2013
    Buffalo NY

    Default Backer board for shower grab bar (fiberglass surround)

    The Kohler/Sterling website keeps talking about "backer boards" for attaching grab bars to their Vikrell surrounds. It's a bit vague, but I once found a page on their site which "sort of" explained it. Now I can't find the page and the company doesn't seem to to understand my query. My memory is that you glue, with silicone, a board to the outside of the surround. This stiffens the surround in the area of the grab bar and give the screws something to bite into. The best practice, of course, is to attach blocking to the framing but I want to add a grab bar in a spot where it will be difficult to block. I do have access to the point.

    Has anyone done this? Is silicone the best adhesive for this? What about construction adhesive?

  2. #2
    Test, Don't Guess! cacher_chick's Avatar
    Join Date
    Jan 2008
    Land of Cheese


    There are specific locations on SOME Kohler/Sterling units for mounting grab bars. Some of their surrounds can be ordered with the backer boards in place. Silicone would work fine for holding the board in place. Because the walls can flex a little, I would not use anything that hardens like construction adhesive.

  3. #3
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    New England


    An ADA qualified safety bar must support at least 300#. Depending on the strength of the surround, It will take some pretty good support to meet those requirements. Personally, I'd want some solid blocking attached to the studwalls I could screw into, with enough so that when the bar was anchored, it didn't flex the surround. I do not know if they have a fastener for this application, but you may want to look at stuff from www.wingits.com. I've used them on a tiled wall with great success.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

Similar Threads

  1. Shower pan installation with backer board
    By ruggles531 in forum Shower & bathtub Forum & Blog
    Replies: 9
    Last Post: 04-29-2013, 06:53 PM
  2. Use of 1/4 inch Hardie backer board on tub surround
    By nickhnw in forum Shower & bathtub Forum & Blog
    Replies: 7
    Last Post: 02-04-2011, 05:04 PM
  3. Grab bar in fiberglass shower
    By rayh78 in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 2
    Last Post: 01-14-2009, 05:08 PM
  4. Shower/tile backer board on old plaster - NEED ADVICE
    By joengn in forum Shower & bathtub Forum & Blog
    Replies: 10
    Last Post: 05-29-2007, 11:36 AM
  5. Installing a grab bar into a fiberglass shower
    By Terry in forum Shower & bathtub Forum & Blog
    Replies: 0
    Last Post: 11-02-2005, 09:01 AM


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts