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As I stated early on that roofs and adjacent seams are highly suspicious of water entry points, especially when rotten floors are involved. There are other causes (poor slam latch door designs, punctured Darco underlayment). But it's good practice to always start at the roof.
Just to clarify what is recommended for sealants:
Horizontal membrane surfaces: Dicor Self-leveling lap sealant
Vertical roof surfaces: Dicor non-sag sealant
Vertical hard surfaces that include hardware penetrations (light fixtures, screws, passthrough door framing, corner trim, awning fixtures): Geo Cell ProFlex RV Sealant.
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2017 Keystone Bullet 308BHS in Saddle.
2017 RAM 2500 Laramie Mega Cab 4x4 Hemi 6.4L
2008 GMC Yukon XL Denali (SOLD)
Hensley SwiftArrow Control Hitch with 1000 lb Spring Bars
Me, DW, (3) little DS's, and 1 rambunctious Boston Terrier
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