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Post by sarahfaye67glendale on Jul 8, 2021 7:02:30 GMT -8
Hi...just before I get too far down the road can I get an opinion on how I’m doing w my reflectix insulation on the roof of my 1967 Glendale Glendette? Thanks in advance! flic.kr/p/2ma4sfh
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Post by vikx on Jul 8, 2021 10:34:35 GMT -8
What you're doing looks good Sarah. Since you have thicker rafters, I would insert rigid foam under the Reflectix. It will give you more R value than Reflectix alone. We recommend Reflectix by itself when ceiling cavities are very shallow.
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lexcentric
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'56 Dalton Frame-up rebuild - New axle. waiting for better weather to put new walls up
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Post by lexcentric on Jul 8, 2021 12:07:58 GMT -8
I'm about to do my ceiling as well and was considering using reflectix on the curved portions at the front and rear with rigid foam in the top (flat) section. I'm assuming that 3/4" foam will not make the bend, but am curious if anyone has tried?
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Post by vikx on Jul 8, 2021 18:33:02 GMT -8
I think you can make a bend with 3/4 foam but oh what a mess! You would have to groove for the curve and that stuff goes everywhere. Wonder how I know that?
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ruderunner
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Post by ruderunner on Jul 10, 2021 2:14:08 GMT -8
See if you can find "fan fold" insulation. It's used under vinyl and aluminum siding. Usually only 3/8 inch thick, fairly flexible.
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DayDreamer
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Post by DayDreamer on Jul 10, 2021 16:51:47 GMT -8
What about fiberglass insulation?
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Post by vikx on Jul 10, 2021 20:03:08 GMT -8
Fiberglass was used originally but because most of our trailers have only 3/4" ceiling cavities, foam board has more R value as does Reflextic. I've also insulated the cavity and laid the orig. fiberglass over that under the roof. Every little bit helps...
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DayDreamer
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Post by DayDreamer on Jul 11, 2021 8:22:25 GMT -8
Fiberglass was used originally but because most of our trailers have only 3/4" ceiling cavities, foam board has more R value as does Reflextic. I've also insulated the cavity and laid the orig. fiberglass over that under the roof. Every little bit helps... The fiberglass insulation is R-13 what is the 1/2” foam board with reflectix? And then you put vapor barrier over that correct? Someone on here said fiberglass holds moisture, if that is true seems like no one would be using it. Lastly when someone says the pink stuff are they talking about fiberglass insulation. Thx much.
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Post by vikx on Jul 11, 2021 10:51:34 GMT -8
The fiberglass in our trailers originally was no more than 1/2" thick, not R 13. It was just a thin layer to say the trailer was insulated. "Pink" stuff is usually higher density foam board-better quality than white board with all the little beads. If fiberglass is used in the belly cavity, it tends to hold water and causes more belly rot. Foam board is recommended in the belly.
Most of us use a vapor barrier, depending on materials used.
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DayDreamer
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Post by DayDreamer on Jul 11, 2021 13:21:24 GMT -8
So my frame boards are 2x2’s so should I use Polyshield or RTech 1.5” or 1” foam board? I’m learning how to maneuver this forum so I asked this in another thread too but meant to post it here.
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Post by vikx on Jul 11, 2021 20:04:08 GMT -8
Whatever fits.
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Post by Teachndad on Jul 12, 2021 8:34:57 GMT -8
So my frame boards are 2x2’s so should I use Polyshield or RTech 1.5” or 1” foam board? I’m learning how to maneuver this forum so I asked this in another thread too but meant to post it here. Like Vikx posted. You might have to play around with what works/fits in the cavity. Use the reflectix when you have nothing else that will work. I found your similar post in this thread vintagetrailertalk.freeforums.net/thread/933/insulation-use shows pictures of insulation and a description of how they scribed the rafters. Shasta 61 gives a good description of how he insulated his trailer. If I may suggest, post in that thread addressed to our member Shasta 61 and see if they can post more details on how they scribed it with a knife to scribe the insulation in the curved parts of the roof. Just a thought. I haven't tried this, but I have seen a 1/4" or 3/8" thick styrofoam used as a packing material. I believe Ruderunner mentioned this very same material in an earlier post in this thread. I don't know if it's commercially available, but if it is, maybe it could be layered and glued. This foam bent very easily and didn't need any scoring in this thickness. Cheers, Rod
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Post by wisconsinjoe on Jul 17, 2021 6:03:14 GMT -8
If you have a 1-1/2 inch roof cavity (or better yet, 1-5/8"), you can bend two layers of 3/4 foam board by kerfing with a utility knife. I draw parallel lines somewhere between 1" and 2" depending on the tightness of the bend. Two passes with the knife, but don't cut through all the way. Then pre-bend with the kerf on the outside of the bend. Before bending, stick packing tape on the un-cut side going across the direction of the bend. Use several strips of tape about a foot apart. Don't worry if you get some cuts splitting all the way through. Set the foam in place with some foam adhesive and clamp down with thin strips of wood stapled across the two layers of foam, temporarily stapled onto rafters.
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