Originally Posted by Lynkage
The FRP (Fiberglass Reinforced Panel) is used in lots of commercial applications and lots of bathrooms.
Yes, we're trying to find why it cracks. Could be it's being cut too close to roof penetrations like vent openings, not allowing for expansion. Just found this passage which recommends 100% adhesion, I know that wasn't always accomplished. I certainly recognized the stuff but could not figure where it came from. Its warranted for 10 years in some installations but what went wrong, the ops motorhome is 3 years old!
"STANDARD WALL PANEL INSTALLATION INSTRUCTIONS
Generally, frp panels can be installed using adhesive alone, fasteners alone, or a combination of adhesiveand fasteners. The method used should be determined by the room and wall conditions (see the wall
conditions noted above). Check your local building codes for any restrictions or guidelines regarding approved installation methods.
If adhesive is used, be sure that it is an frp-formulated product. Frp adhesives are widely available. Follow
the adhesive manufacturer's recommendations for trowel style (e.g., appropriate height of adhesive bead
left by trowel). It is important to apply adhesive carefully and follow all directions to prevent problems that
may result from using too little or too much adhesive. 100% adhesive coverage is recommended using a
"crosshatch" pattern. Adhesive should extend to all edges of the panel and should be applied directly to
the back of each individual frp panel."
Not for certain this is it, but sure looks like it.