Fiberglass under cab bed cracking

[Adluma]

Does anyone know what might've caused this crack in the fiberglass above the cab bed, or how much it might cost to repair? The crack seems to be only on portion of the fiberglass that parallels the cab window, and doesn't run perpendicular to the cab window. Thanks in advance!!

 

[D W]

Looks more like the seam calking is decaying. Needs to be re-caulked. Some of the other seams also need attention as well. I can see rust from the fasteners on the vinyl trim. Use some GEOCELL PRO-FLEX Sealant to re-caulk.

 

[Adluma]

Ok cool thanks!

 

[bikendan]

Does anyone know what might've caused this crack in the fiberglass above the cab bed, or how much it might cost to repair? The crack seems to be only on portion of the fiberglass that parallels the cab window, and doesn't run perpendicular to the cab window. Thanks in advance!!

Please post the year, make and model number of your RV. It appears that have a motorhome. If you provided that information, we can move your post to the correct brand sub-forum and possible factory support.

 

[Mokurt]

Looks like the panel is sagging.
I would first scrape off the old sealant and check the fasteners to see if they are loose.
May have to replace them with larger ones if the holes are stripped.

As far as having a RV shop fix it the price could vary a lot.