Posts Tagged ‘loose’

Wall Sealing Whoops

September 26, 2018


Today I prepped a room where the drywall had been badly torn when the old wallpaper was stripped off. This happened because the original installer hung the wallpaper directly on the drywall, with no coat of paint or primer to protect the drywall.

Before I could smooth the wall surface, I had to seal the torn drywall, because moisture on the torn areas would cause the brown paper to bubble. I rolled on a heavy coat of Gardz, a water-thin, penetrating product that is designed to soak into the porous material, bind everything together, and dry hard. It is supposed to dry inpenetrable by water.

Once it was dry, I skimmed over it with joint compound (which will be sanded smooth later).

As you can see, the Gardz failed to do as claimed, and it allowed moisture from my smoothing compound to seep through it and enter the torn paper of the drywall, which then expanded and bubbled. I’ve got a big mess on my hands!

Tomorrow, when everything is dry, I will sand smooth. Usually bubbles like this dry out and then sand flat. But the large loose areas have me a little worried. They may still be loose and bubbled, and they may swell again when the wall is given its final coat of Gardz.

I may end up having to cut out some loose areas, refloat, and reprime.

Not good, because this could add a full day to this job, and because there could potentially still be unstable areas under the surface. Never good to have an unsecure surface under your wallpaper.

Advertisements

Blue Birds Brighten a Bathroom – But Not A Good Quality Paper

June 27, 2018


The original wallpaper had fallen victim to curled seams. This happens most often with lower-end pre-pasted, paper-backed, solid vinyl wallcoverings, particularly in humid rooms, like this bathroom. Adding to the list of no-no’s were an improperly smoothed wall and the lack of a primer.

The seams on these papers are never great to begin with. When there is humidity, it will find its way into the seams and onto the paper backing of the wallpaper. When this backing gets wet by humidity, it expands. When it expands, it has nowhere to go but out – pushing away from the wall. This results in a curled seam. This is not “loose” wallpaper, and the seams cannot be glued back down. In many cases, the paper backing layer of the wallpaper actually delaminates (separates from) the top vinyl layer.

The homeowner loved the pattern, particularly the blue birds, and bought the same exact paper to replace the other. I stripped off the old paper, took various steps to stabilize the unsound wall surface, then skim-coated the wall to smooth it, primed, and hung the new paper.

The look is cheery and bright, and looks fabulous with the pale yellow bead-board wainscoting. The seams looked good when I left, and will pull down tighter as the paper dries.

Still, these economical pre-pasted, paper-backed, solid vinyl wallpapers are not my choice for use in any room. And this particular brand (Norwall) just about tops my list for brands to NOT purchase.