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05-26-2017, 06:29 PM
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#1
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Member
Join Date: May 2017
Posts: 59
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Roof drilling help
As some may know, I am changing out old heat pumps for new ones. The new mounting lag screw holes on the new unit do not line up with previous holes.
First, the new holes will be about an inch further in than the previous holes. Do you think I will still hit the stud?
Second, how should I seal the old holes?
Thanks,
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05-26-2017, 06:51 PM
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#2
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Senior Member
Join Date: Jun 2014
Posts: 214
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To seal, use Dicor
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Kitty & Rolf - Successfully unemployed since 2012
2000 MADP - 2012 Grand Cherokee
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05-26-2017, 06:54 PM
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#3
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Senior Member
Newmar Owners Club
Join Date: Jul 2006
Location: Wellington, Florida
Posts: 12,996
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Hi LewTippett,
Newmar reinforces the opening for roof HVAC units. When you say the new holes are " further in than the previous holes" do you mean closer together?
The rafters are on 16" centers. Maybe you can find the aluminum reinforcement "box" Newmar built to hold the HVAC unit. I'm more concerned you will hit this box frame. If you center the new unit in the old box framed opening you should be fine.
Fill the old holes with the sealant of your choice and top off the holes with EternaBond.
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Gary
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
The Avatar Is Many Times Around The USA
Nobody Knows Your Coach Like Somebody Who Owns One Just Like Yours
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05-26-2017, 06:57 PM
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#4
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Senior Member
Join Date: Mar 2009
Location: Apollo Beach, FL
Posts: 1,940
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What is your roof made of ? TPO,EDPM, Fiberglass ? That will impact what you should use to fill and seal the old holes
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2013 DS 4338
2015 F-150 toad with kayaks,bicycles and a Harley in the back
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05-26-2017, 06:59 PM
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#5
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Senior Member
Newmar Owners Club
Join Date: Jul 2006
Location: Wellington, Florida
Posts: 12,996
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Hi PanJH,
The roof will be Brite-Tec or Fiberglass.
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Gary
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
The Avatar Is Many Times Around The USA
Nobody Knows Your Coach Like Somebody Who Owns One Just Like Yours
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05-26-2017, 07:40 PM
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#6
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Senior Member
Join Date: Nov 2006
Location: Western NY
Posts: 2,130
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Email Newmar and ask fir roof framing dwgs fir your unit.
I've done this for side walls and they supplied pdf dwgs I requested.
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Don & Marge
'13 Newmar Ventana 3433 - '14 CR-V TOAD
'03 Winnebago Adventurer 31Y - SOLD
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06-02-2017, 05:47 PM
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#7
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Member
Join Date: May 2017
Posts: 59
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No luck on back unit
[QUOTE=GaryKD;3617498]Hi LewTippett,
Newmar reinforces the opening for roof HVAC units. When you say the new holes are " further in than the previous holes" do you mean closer together?
The rafters are on 16" centers. Maybe you can find the aluminum reinforcement "box" Newmar built to hold the HVAC unit. I'm more concerned you will hit this box frame. If you center the new unit in the old box framed opening you should be fine.
OK, the front unit lag screws all bit and tightened down. Passenger side of the rear unit did as well. However, the rear driver side screws hit nothing. Anything short of opening the roof and adding support? If not, anyone point me to a relevant "how to" link?
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Pam and Lew Tippett
2001 Newmar Dutch Star DP
Vidalia, GA
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06-02-2017, 05:51 PM
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#8
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Senior Member
Newmar Owners Club
Join Date: Jul 2006
Location: Wellington, Florida
Posts: 12,996
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Can you slide a piece of wood under the outer roof and screw into the wood making a sandwich to hold the HVAC unit?
__________________
Gary
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
The Avatar Is Many Times Around The USA
Nobody Knows Your Coach Like Somebody Who Owns One Just Like Yours
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06-02-2017, 09:08 PM
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#9
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Member
Join Date: May 2017
Posts: 59
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Come Again?
Quote:
Originally Posted by GaryKD
Can you slide a piece of wood under the outer roof and screw into the wood making a sandwich to hold the HVAC unit?
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This was what I was thinking, I think. Is there some way to go under the outer roof without cutting into it? I was thinking that I would cut into the roof and place a piece of one by between existing studs, re-cover, seal, and then screw into it? Or, is there an easier way?
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Pam and Lew Tippett
2001 Newmar Dutch Star DP
Vidalia, GA
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06-03-2017, 12:31 PM
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#10
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Senior Member
Join Date: Oct 2012
Location: Bushnell, FL
Posts: 6,490
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Hey Lew, not sure about your year/model but you mayfind this helpful:
Dometic Brisk II install on Newmar
and here:
Brisk II Install Story by Bruce (bdkolber) | Photobucket
BTW, if I remember correctly, 1 Lag Bolt is longer than the other 3. You are not bolting to crossmembers ... you are bolting to a frame assembly.
This is the frame that is under the A/C:
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2005 Newmar Essex 4502, 2013 Caddy SRX
1997 HR Endeavor 37, CAT, 1996 Geo Tracker
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