If your water damage is minimal and the wood is still structurally sound you might be able to skip ahead to part 2 seal up the roof to prevent future water damage.
Replace roof boards on jayco popup.
Manually raise the roof with two or more people.
Use at least six pieces of lumber to hold the roof upright.
It is almost inevitable especially if you use it a lot or have had it for quite some time.
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There will be times your pop up camper roof needs repair due to cracks from small accidents or extreme weather conditions.
Place 2 by 4 pieces of lumber between the frame and roof on each corner.