
hardie board siding trim boards
Problems With James Hardie Siding Installations. Aug 25 2009 I want to replace the trim with hardie trim but the original installers ran the siding all the way to the window frame and the wood trim boards were placed on top of the siding According to the hardie trim installation instructions the siding should not run under the trim boards but should butt to the trim board with a minimum of 18 gap.