Builders Edge 3SMO815TW SturdiMount Mounting Block, White BackToSchool How often should I change

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Builders Edge 3SMO815TW SturdiMount Mounting Block, White BackToSchool How often should I changeThe SturdiMount Oversized Mounting Block is designed for fiber cement and hardboard applications to prevent water infiltration and damage. Highlights: Color: White Material: Fiber Cement Size: 8 1 2 inch W x 15 inch H Style: Oversized Generously sized for coach lights, SturdiMount blocks provide a finished look that complements a wide range of exterior materials This block with an ABS flange is designed to keep water at bay