Any leaks around the side windows and roof vents means you have to remove them, clean up the old butyl tape sealant, apply new butyl tape and reinstall, not a hard job but also not something you can do in an hour. If there is caulking around the windows or vent, especially if it is silicon you have extra work to clean that off. A leak can never be repaired with caulking, the window or vent must be removed and resealed properly.
Butyl tape is a remarkable product, this sticky, flexible tape can seal windows and vents for many decades but be aware there are two different products that are often called butyl tape, these pictures show the difference. The left picture is actually butyl putty which is of a lesser quality and only lasts about 8-12 years.
The product on the right is butyl tape, a very high quality product which will last over 40 years.The easiest way to tell the difference between the two is by looking at the release paper. The release paper on the putty is like crape paper or wrinkly, the release paper on the butyl tape is smooth and a heavier coated paper.
The side windows are mounted either with screws into an interior wooden frame or with rivets through the fiberglass with steel backing washers. To remove the Jalousie either remove the screws or carefully drilling out the rivets using a 1/8″ drill bit, this prevents accidentally making the hole larger if you drill through the fiberglass. Usually just drill until the rivet head comes off, then the rest of the rivet can be tapped out with a small punch or even pulled out from the inside with a pair pf pliers. Once all the fasteners are removed the window can be carefully pried and worked out. This can be a lengthy and messy job as the butyle tape will be resisting your every attempt.
Once the window or vent is removed all the old butyl tape must be removed and cleaned up. While you have the side windows out it is a good idea to inspect the seals around the opening window panes and the opening mechanism. The Jalousie windows are excellent in both quality and function and can be completely rebuilt as shown in the attached video.
The side Jalousie windows use 3-4 different seals, these seals fit into grooves on the window frames that are easy to access if you have the windows out and apart.
Along the top this gray vinyl seal is used on the header (Top) of Boler side jalousie windows. It is 7/8″ tall. The T at the top is approximately 1/8″ wide and slides into an 1/8″ channel on the top edge of each window frame
Along both sides a silicon rubber “J” seal slides into an 1/8″ channel on the side edge of each window frame
The bottom pane of glass closes against this seal. The seal fits in a channel and is held in place without adhesives, but the channel is often crimped, the crimp can be opened up by carefully inserting a small screwdriver into the slot and twisting gently.
Between the 2 two window panes I used a “P” weather-strip available at most home improvement stores
This article is not quite finished yet.