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  1. #1
    Join Date
    Jun 2011
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    4

    Default Drywall over painted block

    Can someone tell me if it acceptable to install drywall directly over painted masonry block with adhesive in lieu of firring strips?

  2. #2
    Join Date
    Dec 2010
    Location
    Houston Texas
    Posts
    2,360

    Default Re: Drywall over painted block

    You can IF

    1- This is a dry location and there is NO risk of water getting to the back side of the drywall

    2- You have no desire to remove the drywall in the future. Whomever gets to remove this drywall will curse the day you were born. Furring strips help solve this problem

    3- The block is plumb and straight enough to get nice drywall joints. Furring strips help solve this problem

    4- You have no desire to attach baseboards, crown moulding, or trim. Furring strips help solve this problem

    5- You have no desire to have electrical, plumbing, audio / video. Furring strips help solve this problem

    6- You have some way to get the drywall panels to stay where you want them while the glue sets. Furring strips help solve this problem

    Why do you want to do this?

  3. #3
    Join Date
    Aug 2007
    Posts
    6,481

    Default Re: Drywall over painted block

    Quote Originally Posted by HoustonRemodeler View Post
    3- The block is plumb and straight enough to get nice drywall joints. Furring strips help solve this problem
    Now wait a minute, are you saying that furring strips will F-up a plumb and straight wall?

    I know what you meant, but it bears fixing for clarity.
    I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!

  4. #4
    Join Date
    Dec 2010
    Location
    Houston Texas
    Posts
    2,360

    Default Re: Drywall over painted block

    I am thinking about leaving it, just to see if anyone else is paying attention.

  5. #5
    Join Date
    Jun 2011
    Posts
    4

    Default Re: Drywall over painted block

    This is an existing finished area being used as a church nursery. Existing walls are painted block (many coats). The existing doors are trimmed with 3/4"material and all electrical is existing and fine where it is. The purpose of the drywall is to update the look of the block. This area also has a drop ceiling. If I use firring strips I will have to re-trim the doors and extend the jambs. If I apply the drywall directly, I will save the cost of this as well as the cost of applying the firring strips.

  6. #6
    Join Date
    Aug 2007
    Posts
    6,481

    Default Re: Drywall over painted block

    Rather than overlay the walls, I think I'd be inclined to skim coat them with either plaster or drywall compound to smooth the surface and mimic drywall. It would be a whole lot easier, cheaper, and cleaner to do.
    I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!

  7. #7
    Join Date
    Jun 2011
    Posts
    208

    Default Re: Drywall over painted block

    Two easy ways that any newbie can skim coat any wall:

    1. Use a "V" notched adhesive trowel to spread joint compound on the wall, and allow to dry. Then, holding that same trowel upside down, fill in the trowel ridges with the un-notched side of the trowel. The result will be a uniformly thick layer of joint compound on the wall.

    2. Use a "V" notched adhesive trowel to spread joint compound on the wall. While the compound is still wet, mist it with water using a spray bottle, and trowel it flat using the un-notched side of the trowel.

    In either case, it's best to first paint the wall with white wood glue diluted in enough water to make it into a paintable consistancy. Allow that dilute glue to dry on the wall. The moisture from the joint compound will re-activate the glue, causing it to bond the joint compound to the wall. For a Cadillac job, one could use concrete bonding agent instead of white wood glue. Concrete bonding agent has a "window of opportunity" during which wet material will re-activate it's adhesive properties. Once that time window has closed, concrete bonding agent becomes unaffected by moisture. I'm thinking that if moisture coming through the block wall was a problem, it would mucked up the multiple coats of paint on that wall by now. If moisture migration through the wall isn't a concern, then white wood glue won't re-emulsify and drop the skim coat of joint compound onto the floor.
    Last edited by Nestor; 06-15-2011 at 09:43 PM.

  8. #8
    Join Date
    Aug 2009
    Location
    Ladson,SC
    Posts
    192

    Default Re: Drywall over painted block

    I would agree that skim coating is acceptalable I would stay away from the dry wall product and use an Acrylic Plaster applied to the block.
    Check on One of these products.
    Variance Acrylic Finishes.Located in Albuquerque,NM

    Litex Incorported, Fort Lauderdale, FL

    SAFRA veneer plaster products

    Master of Plaster

    All the above can be textured or applied smooth with color no painting required.
    Can be applied over a painted surface some require a bonding agent that will come with the product that you select.
    I say no Joint Compound based on my experence as a plaster.
    75 % of my work comes from the use of Drywall product applied over substrates that will last from 5 to 20 years than I get to due high dollar repairs.Been doing these repairs for the last 35 Yrs.

  9. #9
    Join Date
    Jun 2011
    Posts
    4

    Default Re: Drywall over painted block

    Great ideas! Thanks!

  10. #10
    Join Date
    Mar 2008
    Location
    nova scotia, canada
    Posts
    1,522

    Default Re: Drywall over painted block

    im with sprucey on this one, definitely just get the wall parged
    fire up the saw and make some dust

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