Spread silicone on all four sides of the hole and at the slit at the bottom to completely seal the edges (Photo 3). You may need to tape the rubber to the siding temporarily until the caulk dries. Let the caulk dry overnight, then partially fill the boot with foam; seal the hole from the inside as well.
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Frequently Asked Questions
What can I use to seal a hole in a trailer?
Use lath screen or lath metal, cement, hardware cloth, or metal sheeting to fix large holes. These materials can be found at your local hardware store. Fix gaps in trailer skirtings and use flashing around the base of the house.