The large rolls allow the builders to apply the stuff in no time flat on the walls before they are stood and the stuff has a prolonged "open time" during construction allowing it to stand up to the weather, especially wind better than felt while the building is under construction. The advantages of housewraps in general are for the builder, not the building. I have mentioned this before and hate to sound like a broken record but I can't understand why the stuff is still on the market or at least why it isn't the subject of a class action lawsuit. On the other hand, nearly everything we take apart with Tyvek behind it is rotted big time. As remodelers, we have yanked apart many an ancient house with felt behind the siding and everything is just fine. Personally we still use good old felt paper behind all our siding jobs. Thay are an air infiltration barrier only. Beware that certain houswraps such as Tyvek and possibly other spun bond products actually let moisture through. There was a comment in one of the replys to your post about the housewrap stopping the water that gets behind the siding. Well-done installation of the J - channel gives the vinyl siding a professional look in corners, doors, windows and other edges of your home. Simply slide the siding panel into the folded J - channel. Vinyl siding is really a leaky siding and the prep you do before installing it makes all the difference in how well the building stands up long term. J-channels are used around windows and doors, on inside corners and where the siding meets the soffit or roof at an angle. Use the undersill trim if the piece of siding under the sill is at the "thin " part of the siding, it will take up some of the slop of the siding in the channel under the sill. Yes you can just side into the J channel.
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