Vincent, Appreciate you posting a summary of your experience working with us.
Although we use select or no 1 grade lumber this has little to do with the natural properties of lumber.
As natural wood behaviour and properties include, shrinking, warping, splitting, twisting etc... This is something that occurs and can cause issues not due to installation or quality of workmanship but simply due to natural wood behaviour and properties which are largely out of any installer's control. Furthermore, it is all outdoor lumber that is susceptible to this and even Cedar would share similar properties and behaviours.
Warranty Exclusions that are Industry Standard including from HOME DEPOT or any other big box store Installation departments would include items such as this as technically if a gate is jammed due to a warp it would not be eligilbe for a warranty claim.
Having said that In or Out of Warranty when it comes to Our Customers we do all we can when a fair and feasible request is made to remedy the situation.
Although Warranty is meant to cover 'Lift / Lean of Posts' or 'Detaching Sections' we do our best to adjust gates when requested and take care of our customers as best we can when fair and feasible.
Glad we resolved your issue to your satisfaction and once again thank you for sharing your experience.
CAN DO Fence and Deck
Sales Office: (416) 630-DECK (3325)
Mobile: (416) 989-3934