I am in the process of installing a second AC (Duo Therm by Dometic) over the existing vent cover in the garage of my TH. I have a aluminum roof. The old vent has left holes in the aluminum. It says in the instructions to fill holes. I don't want to use caulk because it's right where the gasket of the AC will go. I am thinking of using Aluminum Foil Duct tape over the holes. It seems to stick well but I do not know how it will hold up to exposure to water?
I have a six inch thick roof. Instructions say I need optional duct adapter kit which will come with longer bolts 8" instead of 7" and a small metal duct extention. I would have to order this. I am thinking I can buy 1/4" x 8" bolts and make my own square duct but the instructions say the bolts are self locking? So are they something special? Any thoughts would be appreciated.
2011 Work and Play 30WR. Added 2nd AC, four deep cycle batteries.
I usually run flat head screws into the holes, pulled so the heads are just flush. If they will be inside or well under the gasket, I don't worry about it. If it's close to the edge, I will put a dab of proflex on the screw holes and run the screws through it, clean the excess and let it set for a bit before putting the unit down.