Where Should Butyl Tape Go When Installing Rood Membrane?
Updated 10/23/2025 | Published 04/02/2025
Question:
When installing side trim does the butyl tape go on the camper then tpo membrane then another strip of butyl on the trim? The video shows you adding under membrane but didnt notice any butyl added to the trim. I hope this question is clear enough to understand. Thank for your response.
asked by: Rich N
Expert Reply:
Hello Rich, good question. One layer of butyl tape is typically enough to keep things sealed. So if you do one layer under the membrane that should be fine. You can add a second layer on top of the membrane for extra protection if you wish, but it would not be necessary.
Product Page this Question was Asked From
Alpha Systems Superflex TPO RV Roof Membrane - White - 20' x 9-1/2'
- RV Roof Repair
- Roof Membrane
- TPO Membrane
- Rubber Roof
- TPO Roof
- 20 Feet Long
- White
- Alpha Systems
more information >
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on RV Roof Repair
Jesse M.
10/22/2025
Hey Rich, how did things go with sealing the side trim using the butyl tape and TPO membrane? Your update could make it easier for the next person working on the same roof setup.