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The Building Block to a Better Fiber Cement Siding Job

We’ve leveled up our Fiber Cement Siding game with the addition to XtremeBlock to our product line.

Xtreme Block is easy to install and in stock at Holden Humphrey in five different profiles to accomodate for electrical mounts, spigots, lights and more.

Xtreme Block is designed to angle water away from the wall and the fixture as well as assure a caulk free install. Xtreme Block is the easiest way to add a receptacle or mount to your fiber cement siding!