Pre-molded perlite fitting covers are the best choice for use with calcium silicate. They offer the abuse resistance of calcium silicate without the moisture absorption properties. Pre-molded consistently outperforms mitered fitting covers. WR-1200 products will not become saturated when accidently exposed to water. This outstanding feature drastically reduces potential for corrosion under insulation while assuring the customer of optimum thermal performance.
Most water entering an insulation system comes in at the fittings.