Apply caulking compounds rated for exterior use when caulking window trim.
Putting trim over siding gap.
I guess it s a new trade since they nail exterior trim over the siding with 7 16 gaps.
Leave a minimum 1 8 in.
On most new homes the trim goes up after the siding is installed which creates a large gap that should not be caulked.
Follow your window door manufacturer s installation instructions for caulking guidance between window and trim.
01 28 2015 at 04 33 pm.
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.
Gap between siding and trim then caulk.
The cement board panels are fastened to the battens.
The rain screen battens are run down to the top of the window flange.
In addition a gap of between 1 8 and 1 4 inch between the edge of the siding and the window trim requires treatment as well.
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.
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.
Last edited by jerry peck.
While tight gap siding can be installed from the top down we usually run it from the bottom up.
It s especially affordable when it placed over existing siding because the labor of removing the old siding is not needed.
There are a few things that you ll need to know when doing this however.
Figure 14 flashing over trim do not caulk along top edge hardietrim board water resistive barrier siding 16 in.
Trim boards that sit on top the siding.
If the trim is being applied over the hardi panels.
The first is your moving the siding of the house about 3 4 of an inch outward.
In the old days the builder would install the trim bring the siding up to it and caulk the corner.
On tight gap there s no tongue so face nailing is the only option.
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.
The head flashing is installed in a bed of caulking onto the top of the window frame.
Butt to siding trim the opening prior.
The wrb is lapped over the head flashing or the flashing is taped.
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.
