Install Window Trim Before Or After Siding

If the trim is being applied over the hardi panels.

Install window trim before or after siding.

To provide a common reference point measure up 8 in. The head flashing is installed in a bed of caulking onto the top of the window frame. We used pressure treated 2 x 4 s for the trim around the windows and the doorway and then we had to create trim corners for both the inside and the outside corners like the ones in the picture above. The rain screen battens are run down to the top of the window flange.

Before you replace the siding cut and install new j channels to prevent water from leaking into your home. Also if the windows are of different sizes it gives the contractor a chance to make some custom changes so the window will fit properly. As long as the old siding isn t bulging or falling off you can usually install vinyl siding right over it. From the top of this row and stretch a string line across the deck.

Instruction on how to install exterior 2x4 trim around a new or old window. If we installed the trim after the siding we would have had to caulk a ton to fill in for the different levels the layered siding creates. Nevertheless you can install the siding first if you have already started on that. Begin by installing the first row of siding on both sides of the deck.

This increases the exterior wall thickness however so you ll need to extend the window. The cement board panels are fastened to the battens.