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Old 08-19-2013, 02:32 PM   #10
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Default Re: 2010 3500 RV build (formerly painted seat pedestals)

Got the rear AC frame installed. I filled it with expanding foam first. VHB tape is between the frame and the cross members. ABS blocks & shims fill the space between the frame and the inside of the roof where the A/C supports will be on the outside. I used 3M fast set polyurethane adhesive (window weld) to glue the ABS to the roof. I had to run conduit through this frame. I used a section of smaller diameter conduit and slid the smurf tube over the ends held with some PVC glue.

image note: We also injected foam into the van roof cross members and used strips of Dynamat to seal the holes. (-Which was a bad idea because the expanding foam did not cure and kept running out on sunny days. We now recommend pulling Thinsulate strips into the ribs.)

I used the remaining tube of Window Weld to re-attach the exterior body panels to the space frame. There were a number of places that were completely loose. Not sure what causes them to come loose. Maybe the sliding door since most of the failed adhesive was on that side. I think some of the panels were even rattling.

Also painted the A/C inside assembly to match the interior. Rustoleum Aged Iron texture paint again.

The picture below shows the headliner that came in the van. I painted the fan to match it too. I've started insulating from front to back with 3M Thinsulate held in place with 3M 90 spray adhesive. Then a vapor barrier of taped on Reflectix. Not sure I'll follow the same exact scheme on the walls. I will use more Thinsulate but may add some sort of rigid foam first.

I've installed Thinsulate over the cab headliner, behind the door panels, and behind the trim on the A & B pillars. All the doors and every unsupported panel has been damped using a 9 pack of 18x22 sheets of Dynamat Extreme which I got online from Best Buy. We are quite happy with how quiet the front is even though its basically a wall-less cargo van in the back right now.

2010 MB 3500 RV conversion.

Last edited by hein; 10-02-2015 at 06:56 PM.
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