Originally Posted by EllenAndHerPlayPac
Reseal the vents and skylight. (lots of silicone)
Ellen, let me be the first of many to say, "Don't use silicone." The stuff is a mess, and if you ever want to remove it, you will have trouble.
Go to an RV dealer and get ProFlex sealer. It will do a better job and will be much easier to apply.
Of course, any sealer is just a final touch on the job. If you have parts that don't fit quite right, find out why and fix them properly. Then use the ProFlex.
Good luck with hour remodel.