| Generator compartment insulation [message #213457] |
Sat, 06 July 2013 09:39  |
bpimm
Messages: 211
Registered: June 2013
Location: Washougal Washington
Karma: 2
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The insulation in the generator compartment is falling out and very dirty. What is a good replacement material?
I was thinking of a 1/2" to 1" layer of rigid polyisocyanurate foam and a layer of the heat reflective bubble material and then maybe a sheet metal liner. should be easy to clean and provide thermal and noise insulation to the interior but no sound deadening for the outside. It might make it an echo chamber outside.
Thoughts?
Brian & RaeDean
1973 26' #383
Brian & RaeDean
1973 26' #383
Washougal WA
[Updated on: Sat, 06 July 2013 09:40] Report message to a moderator |
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| Re: [GMCnet] Generator compartment insulation [message #213573 is a reply to message #213560] |
Sun, 07 July 2013 07:57  |
bpimm
Messages: 211
Registered: June 2013
Location: Washougal Washington
Karma: 2
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The microfoil looks great, where can it be purchased? I did a search and didn't get anything where I could order a roll.
| Ken Burton wrote on Sat, 06 July 2013 20:43 |
Do not use that bubble stuff. It burns quite rapidly. If you doubt my warning, take a piece of it and put a match to it.
If you want some thing better use Northern Ohio Foam Products microfoil. It will not sustain a flame on its own. It will melt and burn if a flame is held against it.
http://www.nofp.com
http://www.nofp.com/wordpress/products
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Brian & RaeDean
1973 26' #383
Washougal WA
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| Re: Generator compartment insulation [message #213602 is a reply to message #213457] |
Sun, 07 July 2013 11:14 |
mickey szilagyi
Messages: 273
Registered: January 2013
Karma: 0
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We used some stuff called Thermo-Tec and foil tape when we re-did our generator compartment on our 26' 1977 Kingsley. We bought it all on Amazon. Here's the Amazon titles:
Thermo-Tec 14130 24" X 48" One Sided Thermo Guard Flame Retardant
Thermo-Tec 12005 Spray-On Adhesive - 16.75 oz.
Scotch Aluminum Foil Tape 3311 Silver, 2 in x 10 yd 3.6 mil
Our install photos will show some of the Thermo-Tec starting here:
http://www.gmcmhphotos.com/photos/generac-primepact-50g-installation/p49782-original-battery-compartment.html
We left the original foam inside the compartment even though it was coming off in places and even scorched at the top. We cleaned it carefully with a scotch pad but you could clean it some other way. We also vacuumed it off and I suppose you could wash it. We left it because we wanted the insulating factor it had to remain. But we re-attached it in all the loose places with contact cement - used to glue counter tops. We coated both surfaces and once they were pressed together they stayed. In places where the original foam was sagging we carefully cut a slit in it so we could apply the cement between the two surfaces. We used an old paint brush to get plenty of the cement on both surfaces. On the top where it was sagging we cut an X in the original foam and pushed in the contact cement. It is really important to get enough of it on both surfaces, let it set for 10 minutes or so and then press the two together. Follow the directions on the can. Once we secured the original foam in place we then applied the Thermo-Tec over it using the spray adhesive. It worked great, just like the contact cement. But we did mask off where we didn't want the adhesive to go. Again, once the two surfaces touch they are stuck pretty much for good so make sure you're on target when you put the Thermo-Tec in place. We used one whole 24 x 48 inch sheet to go from the back of the main compartment up the back, on the top towards the front and then up under the compartment door hinges. On this large piece we started placing the piece in just below the hinges (eight or so inches from the top of the piece), rolled and pushed the rest of the top up under the top of the compartment door. Then we worked our way back on the top and then down the back. This is definitely a two person job as you CANNOT let the pieces touch once they have glue on them - they really stick together. We dry fit everything before adhering as you don't get a second chance with the glue. We taped all the joints with the aluminum tape.
We chose the Thermo_Tec as it was thin, about 1/4 inch but provided good heat protection along with aluminum reflective properties. Plus we had a space problem. We had to keep the compartment as big as possible because our clearances were right down to barely getting the PrimePact 50 into the compartment.
This installation isn't very old so we can't give you any info on how it all is going to stay put. So far it's fine. We've run the generator for about 1/2 hour. We will see how things hold up as we use it more. We also put a 1/8 inch sheet of neoprene between the generator bottom pan and the aluminum plate we installed as the bottom of the generator compartment. We sprayed the neoprene with silicon lubricant which really helped slide the generator in place as there was very little extra room to wiggle and push it in. We're happy with the sound insulation but don't have much to compare it to as we haven't been inside another coach with the generator running.
Our two cents worth....
Mickey
1977 Kingsley, 403, Lansing, MI
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| Re: [GMCnet] Generator compartment insulation [message #213638 is a reply to message #213573] |
Sun, 07 July 2013 19:17 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Call them and order it direct. They will UPS it to you. Be sure to tell them that you are going to use it on a GMC motor home. I paid them a visit with my GMC many years ago. It is a family owned business. The owners took me through their manufacturing facilities. They will also send you samples if you ask.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Generator compartment insulation [message #213642 is a reply to message #213602] |
Sun, 07 July 2013 20:43 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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That is an interesting product. It's heat rating sure looks much better than other stuff I have seen. At $20.00 a sheet, 1 or 2 sheet would definitely do the trick.
Ken B.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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