Is a Built-in J Channel Good for Double Hung Windows?

Aesthetically, built-in J channels usually look better! They give a sleek finish compared to the traditional option. Just keep in mind that this option might not be as practical for every situation, depending on your siding and weather conditions.

Generally, new construction vinyl windows don't require a traditional drip flashing if they have built-in channels. However, you should definitely apply weather seal tape to prevent air leaks. It's all about making sure everything is sealed up tight!