Re: roof material on GS Visa 23RBK
Make sure the trailer has no signs of leaking inside the trailer (regardless of roof material) - such as discoloration on the ceiling or walls, soft spots on the floor. If anything like that is present, find another trailer. There can be serious hidden damage (rotted wood, mold) that is very difficult to repair.
On the roof itself look around the vents and other openings at the sealant (Dicor lap sealant). Make sure the sealant is in good condition, not loose, without cracks in the sealant. It does get dirty which is normal. Also check the edge of the roof, where it meets up with the sides and front and back to makes sure those are also well sealed without cracks. Also look for any openings with an exceptional amount of sealant on them - that could be the sign of the trailer having a leak that the owner tried to seal by adding more sealant rather than replacing what was there (which usually doesn't work). Many people recommend resealing every year or two. IME, if done reasonably well the sealant will last for 4-5 years or more.
The roof material itself is pretty durable and long lasting. The only concern would be an obvious tear or large spot of sealant where a tear had been repaired. They're pretty hard to tear, but a tree branch poking downward could do it.
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2014 Innsbruck Lite 198BH
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