Putting Trim Over Siding Gap

On most new homes the trim goes up after the siding is installed which creates a large gap that should not be caulked.

Putting trim over siding gap.

On tight gap there s no tongue so face nailing is the only option. Follow your window door manufacturer s installation instructions for caulking guidance between window and trim. The main difference in the installation instructions from glancing through them both is that the hz10 product is permitted to have the trim installed over the siding while the hz5 product is not. 01 28 2015 at 04 33 pm.

It s especially affordable when it placed over existing siding because the labor of removing the old siding is not needed. Leave a minimum 1 8 in. Hardie siding requires a minimum 2 gap from all hard surfaces like decks or rooflines and at least 8 from any soft surfaces like grass dirt or gravel. The wrb is lapped over the head flashing or the flashing is taped.

Last edited by jerry peck. Gap between siding and trim then caulk. Apply caulking compounds rated for exterior use when caulking window trim. The first is your moving the siding of the house about 3 4 of an inch outward.

There are a few things that you ll need to know when doing this however. The rain screen battens are run down to the top of the window flange. The most common approach here is to install sill trim at the soffits rip down the top course of siding and crimp the siding so the sill trim holds it in place. V joint or 45 degree shiplap is a little trickier.

It takes a lot of talent to make sure you don t shoot to much caulk inside the trim and they et caulk it perfectly flush with the trim using a special technique. During my time working for james hardie i very rarely got calls from homeowners that wanted to submit a warranty claim for their hardie siding. In the old days the builder would install the trim bring the siding up to it and caulk the corner. Trim boards that sit on top the siding.

I guess it s a new trade since they nail exterior trim over the siding with 7 16 gaps. The head flashing is installed in a bed of caulking onto the top of the window frame. Figure 14 flashing over trim do not caulk along top edge hardietrim board water resistive barrier siding 16 in. If the trim is being applied over the hardi panels.

The cement board panels are fastened to the battens. This works fine most of the time but always add a few blobs of caulking inside the bottom lip of the top course for extra security. Butt to siding trim the opening prior.