Every RV should have Insulation and gluing it is the best way to keep it in place. As part of the Insulated Floor Project, I just finished gluing all the individual pieces of Poly-Iso insulation board between the floor ribs of the Ford Transit floor.
You can read about all the details, and view all the photos and videos on the project page. When the entire floor project has finished, the complete guide will be made available for download.
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