Install a nailer
I hate redoing any mitre, but I will if that’s what it takes. Also, I always install a nailer for the crown moulding even if the trusses are running perpendicular. A nailer takes the guesswork out of finding the trusses/floor joists and guarantees the crown will stay in place.
Submitted by New Hope Remodeling @newhoperemodeling
Consider using a jack mitre
A jack mitre is basically a combination of a butt joint and a mitre joint. So why use a jack mitre? Basically, the jack mitre gives you extra strength and minimises the movement of the wood, which means that there’s less of chance of gaps. Plus, the jack mitre creates a much smaller glue line so there’s no glaring glue mark after your casing is painted. And, jack mitres are just cool!
Submitted by Seth Vyn @sethvyn
Build a large assembly table
It’s typically much easier to preassemble large casing and jambs before installing them. An assembly table is especially useful if you’re working on a house with a bunch of large windows. A big, flat, stable area to work makes assembly a breeze and results in cabinet shop-like quality.
Submitted by Sean Fagan @sean.fagan