Which adhesive caulk for solar panel mounts??

They said that the Thermo Panel is used on the interior walls and on the floor. Did not describe are explain the make up of the Thermo Panel.

mrdon2 wrote:
The attachment shows the roof prints to help you find the cross members to screw into.

Finding stud centers may take some patience.

I had roof prints from my trailer manufacturer, they only served as a rough indication of rafters location. Wooden rafters are narrow 1.3/4" so I needed accuracy +/- 0.5" or better. Prints showed the layout from the inside, i.e. looking from the room, not looking from above. Say, print shows the distance to rafters from the wall and it is unclear whether it is from the inside panel or whatever. When you are on the roof, there are no reference points other than curvy lines of exterior trim, and the roof itself is arched.

So drilled 1/64" pilot hole and passed a thin stainless wire to see if there really was a rafter where it should've been, and where the edges and centers are. Few times the hole was close to the edge and had to be abandoned, plugged and sealed, it's just a tiny 1/64" hole, and another hole was drilled. My brackets were home-made, aluminum, big footprint each bracket, 3-5 screws per bracket, and there was enough room to correct a mistake and drill another hole. Off the shelf brackets are too small to drill another hole next to the first one, or - worse yet - they are plastic.

In motorhomes the cross-members could be metal but I'm not sure they are wider than 1.3/4", so you'll need same accuracy.

westend wrote:
What about that Thermo-Panel definition? Just curious....

Must be typo.

What about that Thermo-Panel definition? Just curious....

Wanted to say thanks to all those that responded to the original post. While I was waiting on responses to the original post, I also emailed Winnebago with pretty much the same request. Within 24 hours my response from Winnebago was as follows; "You can use both. The adhesives we use are the 3M style glues and the screws are self-taping no longer than 1 inch. The attachment shows the roof prints to help you find the cross members to screw into." I also received four pdf files outlining the roof layout on the 2008 Access. Very impressive response with a very quick response.

Using 3m 5200.

Without screws, gluing it to rubber-ish membranes - including TPO sheets - won't be smart. Even If it adheres well, you don't want it to fly off with pieces of membrane still attached. I vaguely recall some TPO membranes with plywood backing and aluminum joists underneath - not wooden joists. You better find out what you have there, before driving the screws in. Without anchoring it to joists, you need more screws per each bracket, to hold in 3/4" particle board.

mrdon2 wrote:
I have been reading these post with regards to adhesive/securing of solar panels to roofs on motor homes. I presently own a Class C 08 Access that has Thermo-Panels Material on the roof. My question is what should I use to adhere these panels to the roof with this type of roofing material. All comments and suggestions will be appreciated.

Do you mean a TPO membrane?
TPO = "Thermoplastic polyolefin" according to google

If so, it's just like a rubber (EPDM) roof; there's a plywood under-layment that you can screw into. Or, even better, if you can find wooden joists, you can screw into those. When using screws, some don't even use an adhesive sealant between the bracket and roof material, but I did, using 3M 4200.

I have a rubber roof not TPO. Can't really say how well the 3M Polyurethane or Hybrid products will adhere to TPO. And then there's the question of how strong the glue between the TPO and the roof is. Prolly best to make sure your screws can do the job. I use 3 #10 screws per 6" bracket, 4 brackets per panel, into what seems to be 3/8" plywood, not chipboard.

On top of the bracket, covering the screws and edges of the bracket, any good non-adhesive sealant will do; but I used 3M 4200 there too just because it was already opened and available.

EDIT: Just noticed Almot has already said the same thing.

Not sure about Thermo Panels Material.

If this is a TPO - thermoplastic polyolefine - I suggest you use same things as on EPDM rubber membrane. Stainless screws and a decent sealant (adhesion won't matter, it's just to seal the screw holes).

I have been reading these post with regards to adhesive/securing of solar panels to roofs on motor homes. I presently own a Class C 08 Access that has Thermo-Panels Material on the roof. My question is what should I use to adhere these panels to the roof with this type of roofing material. All comments and suggestions will be appreciated.