Re: Replacing vinyl veneer on a vinyl clad wood core slider
Vinyl products are generally maintenance free.... meaning disposeable. If it's over 10-15 years old it may be past it's useable service life. The PVC is seam welded or shrink heated to form to the wood under it. The wood can;t breath and PVC is vapor permeable to eventually, moisture will get into the wood and cause problems. PVC also expands at a different rate than wood whne heated as well.
MY guess is one of the seam welds has a leak, moisture got in and expanded the wood and split the PVC cladding.
TO make matters worse, when exposed to direct sun, PVC when it reaches about 150F will start to warp. Over time even with UV stabilizers, it will become brittle.
But your repair might extend it's life a few more years.
1925 Two-Story Stucco Beaux Arts Neoclassical