Window Trim

4/2/2021 at 11:08:04 PM

You can watch a YouTube video from the supplier (Hardie). I watched and it only talks about providing a 1/8" gap at the ends of the siding boards. I prefer to leave a slightly larger gap (1/4") and apply caulking at the junction (interestingly not mentioned in the video). That would also allow the trim to be more easily removed.

In the Building Code (9.27.4.) it states: 'Sealant shall be provided between masonry, siding or stucco and the adjacent door and window frames or trim, including sills, unless such locations are completely protected from the entry of rain.' (i.e. fully protected by a roof or balcony above).

I'd say your installation is done in accordance with 'common industry standards'. If you want something more or different this should be spelled out in writing.

There are pros and cons to different kinds of siding. Hardie has the advantage of being noncombustible but the disadvantage of not being is easily serviceable as vinyl siding if you need to remove and replace pieces. On a flat plane having trim around windows and doors facilitates easy access to these components for future servicing.