Community Forums

dp7 · 03-15-2018, 03:34 PM

I have had both dometic roof units replaced under warranty. I noticed that they are attached to the fiberglass roof with what appears to be 4, quarter inch lag bolts. I am curious if Newmar provides any additional support for these bolts to thread into. Seems that if they only thread into the fiberglass roof & thin wood underlayment, that the female threads would be prone to cross threading or stripping damage. Anyone know what those bolts thread into?

Mr_D · 03-15-2018, 03:37 PM

Having ordered two DSDP's and living with them for a total of 15 years I'm pretty confident that there is reinforcement around the openings and the bolts are into something more solid than fiberglass and luan.

"007" · 03-15-2018, 07:59 PM

Your roof rafters are 16" on center and crossed braced at opening to mount AC plate on a new form gasket required for new AC installs. -- NEW GASKET INSTALL

Stuart W · 03-16-2018, 07:38 AM

Also wood below the fiberglass

lass · 03-16-2018, 08:18 AM

Here's a drawing of the Newmar plenum. Hope it helps.

dp7 · 03-17-2018, 12:55 AM

Quote:

Originally Posted by lass

Here's a drawing of the Newmar plenum. Hope it helps.

Thanks!

The drawing says sheet 2 of 2. Would you happen to have sheet 1?

Also it says for recessed ceiling. I assume that only the high end coaches have recessed ceilings. Perhaps sheet 1 is for non-recessed ceilings.

bruceisla · 03-17-2018, 04:10 AM

Quote:

Originally Posted by dp7

Thanks!

The drawing says sheet 2 of 2. Would you happen to have sheet 1?

Also it says for recessed ceiling. I assume that only the high end coaches have recessed ceilings. Perhaps sheet 1 is for non-recessed ceilings.

I don't have sheet 1 but the drawing Lass provided is accurate. However, it is actually the "support adapter" that is welded to the cross braces. It is a square of flat aluminum plates. The lag bolts go thru the fiberglass and into the plates. In other words, the A/C unit is actually bolted (indirectly) to the cross braces.