mobiltec
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Post by mobiltec on Mar 3, 2015 18:28:57 GMT -8
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mitchell
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Post by mitchell on Mar 23, 2015 12:18:25 GMT -8
I noticed on some restoration project that the insulation was installed on the exterior of the frame between the battens. Then the vapor barrier and skin applied over and attached to the battens.
In other projects ,plywood was used on the exterior with framing on the interior and the insulation applied under the exterior sheathing, between the framing. i would assume that this approach would be better suited for installing the skin over a solid surface, providing more stability to the skin where needed.
i ask this only because we are installing a polished aluminum skin and would assume that less oil-canning would occur , provided the solid surface ( 1/2" plywood) as a base for the aluminum.
is their a right or wrong approach to this?
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John Palmer
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Hi, From a vintage trailer guy located in Santa Ana, CA. It's good to see lots of activity here.
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Post by John Palmer on Mar 23, 2015 14:22:11 GMT -8
I noticed on some restoration project that the insulation was installed on the exterior of the frame between the battens. Then the vapor barrier and skin applied over and attached to the battens. In other projects ,plywood was used on the exterior with framing on the interior and the insulation applied under the exterior sheathing, between the framing. i would assume that this approach would be better suited for installing the skin over a solid surface, providing more stability to the skin where needed. i ask this only because we are installing a polished aluminum skin and would assume that less oil-canning would occur , provided the solid surface ( 1/2" plywood) as a base for the aluminum. is their a right or wrong approach to this? IMO, It makes no difference. On one trailer, I have skinned the out side with Luan, then house wrap, before the aluminum skin. Oil canning is caused by the expansion of the aluminum skin due to heat. The extra layer of wood under the aluminum did not help with heat expansion. |
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Post by bigbill on Mar 23, 2015 18:34:54 GMT -8
I noticed on some restoration project that the insulation was installed on the exterior of the frame between the battens. Then the vapor barrier and skin applied over and attached to the battens. In other projects ,plywood was used on the exterior with framing on the interior and the insulation applied under the exterior sheathing, between the framing. i would assume that this approach would be better suited for installing the skin over a solid surface, providing more stability to the skin where needed. i ask this only because we are installing a polished aluminum skin and would assume that less oil-canning would occur , provided the solid surface ( 1/2" plywood) as a base for the aluminum. is their a right or wrong approach to this? IMO, It makes no difference. On one trailer, I have skinned the out side with Luan, then house wrap, before the aluminum skin. Oil canning is caused by the expansion of the aluminum skin due to heat. The extra layer of wood under the aluminum did not help with heat expansion. John is correct on the oil canning the only thing that sheeting under the alum does is increase the impact resistance. |
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mick
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Post by mick on Mar 24, 2015 22:13:22 GMT -8
John, Bill, if Iunderstand you right you're saying that when using luan on the outside you're sandwiching the insulation between that and the inside birch? Sounds like slightly more R factor using the extra luan I also like the impact resistance remark.
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John Palmer
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Post by John Palmer on Mar 25, 2015 7:08:30 GMT -8
John, Bill, if Iunderstand you right you're saying that when using luan on the outside you're sandwiching the insulation between that and the inside birch? Sounds like slightly more R factor using the extra luan I also like the impact resistance remark. Roof skin is flat on the top, and needs to curve down in the front and rear to meet the windows. Metal likes to bend in ONLY ONE DIRECTION. You need to keep the flat roof and the front and rear sections as flat and as square as possible. The more "stuff" you put on the roof, the easier it is to have the surface bow. This bow will cause the skin to make a "compound curve" at the ends. The compound curve will show up as PUCKERS in your metal. I view the addition of the extra luan sheeting, as a future possible roof skin installation problem, without much upside advantage.
Just an old mans opinion.
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mobiltec
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Post by mobiltec on Mar 25, 2015 16:18:04 GMT -8
There are only two things that might likely impact the roof. An airplane and a tree. A sheet of luan is not going to help much in either case....  |
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mick
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Post by mick on Mar 25, 2015 17:43:00 GMT -8
Gotcha, I was just curious after reading this thread and saw the luan mentioned.
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jodybitzz
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Post by jodybitzz on Mar 27, 2015 17:13:00 GMT -8
Larry, your videos were a godsend when we installed our new skin! Couldn't have done it without you!
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mobiltec
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Post by mobiltec on Mar 31, 2015 15:36:28 GMT -8
Thanks Jody. Glad they helped you out.
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