Installing Fiber Cement Siding Over Wood Siding

Some fiber cement panels act as a rain screen system so when retrofitting fiber cement onto wood or any other material the substrate should be in great shape prior to installation.

Installing fiber cement siding over wood siding.

Fiberglass cement siding is a composite made of portland cement silica and wood fiber. Begin by installing the inside and outside corners on the wall. If the cement siding is to be installed over wood sheathing 7 16 osb or plywood at a minimum it is recommended to use a 6d nail. Nail strips of wood lath where the lowest siding course will hang.

Attach a horizontal strip of wood lath that s 0 25 in 0 64 cm thick and 1 25 in 3 2 cm wide directly above the chalk line. Adding another layer onto the original siding might cover up existing issues some of which can be serious like previous water infiltration or foundation problems. Installing fiberboard cement siding fiberboard cement siding looks identical to wood once it s painted. Putting up trim before installing fiber cement siding.

Corners should be at least thicker than two stacked pieces of siding to allow room for caulking. Measure up 0 25 in 0 64 cm from where you want the bottom of the fiber cement siding to be then snap a level horizontal chalk line. Remember that the siding is hard so be sure the nails are located at the right place before driving them.