Home » Public Forums » GMCnet » [GMCnet] Insulation, measuring, nesting and cutting
| [GMCnet] Insulation, measuring, nesting and cutting [message #284375] |
Sun, 09 August 2015 08:47  |
Olly Schmidt
Messages: 1265
Registered: February 2014
Location: Germany and Scottsville, ...
Karma: 8
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After removal of insulation is before installation of insulation.
I measured all the rectangles, put them into a nice table, and wondered
how best to puzzle them onto the 8x4s, when I thought, why not let the
computer do it.
A quick search revealed GoNest a free to try program for just that purpose.
Added the size of the sheets, the size of the rectangles, and how many I
needed, clicked the magic wand, and the program told me, I need 5 sheets
and showed me, how to cut them.
I went ahead, marked all five sheets yesterday, and this morning, I went
ahead with a Bernzomatic 6-in-1 hot knife and cut the stuff. Took me a
total of two hours, and apart from me feeling like being on LSD cause of
all the fumes, everything else looks nice.
I first wanted to get the Dremel VersaTip, but that wasn't available
locally, which makes me answer my month old question: Order online or
buy local, with a very definite: If you are located in the middle of
nowhere (like Farmville, VA), order everything online. You'll be much
better off.
--
Best regards
Peer Oliver Schmidt
PGP Key ID: 0x83E1C2EA
'76a Eleganza II, VA
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Best regards
Olly Schmidt
PGP Key ID: 0x18a9 3a1f 4196 bf22
'76a Eleganza II, VA
'73 Sequoia, SH, Germany
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| Re: [GMCnet] Insulation, measuring, nesting and cutting [message #284498 is a reply to message #284375] |
Mon, 10 August 2015 12:39  |
Olly Schmidt
Messages: 1265
Registered: February 2014
Location: Germany and Scottsville, ...
Karma: 8
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Senior Member |
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Yesterday I went ahead and tried to install the double layer of 0,75"
thick insulation.
No f* go. I was able to install a single layer of the 0,75" stuff, but
after having the first layer in, there was maybe room for 1/2 inch or
so. Sometimes even less.
I went ahead and bought some Reflectix stuff, that 0,25" thick and added
that to the whole ordeal.
Looks okay so far. I also found out, that a sharp knife is enough to cut
the foam insulation, no need for the hot knife setup. Live and learn.
Today or tomorrow will be the day of cutting the sheets for the ceiling.
If I remember correct, a rotary saw was the tool of choice for cutting
the FRP, wasn't?
--
Best regards
Peer Oliver Schmidt
the internet company
PGP Key ID: 0x83E1C2EA
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Best regards
Olly Schmidt
PGP Key ID: 0x18a9 3a1f 4196 bf22
'76a Eleganza II, VA
'73 Sequoia, SH, Germany
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| Re: [GMCnet] Insulation, measuring, nesting and cutting [message #284502 is a reply to message #284499] |
Mon, 10 August 2015 13:45 |
Olly Schmidt
Messages: 1265
Registered: February 2014
Location: Germany and Scottsville, ...
Karma: 8
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Am 10.08.2015 um 13:56 schrieb A.:
> Peer Oliver Schmidt wrote on Mon, 10 August 2015 12:39
>> ...I was able to install a single layer of the 0,75" stuff, but after having the first layer in, there was maybe room for 1/2 inch or so.
>> Sometimes even less. ...
> Is the 0.75 stuff really 0.75, or closer to 1"?
>
> All the info I have read from other people that did it said the ribs were 1-1/2" deep.
>
> What's the R-value of the foam board you are using?
http://www.lowes.com/pd_304087-210-304087.0_1z11pq2__?productId=3122443&pl=1
I never checked the supposed size. Anyway, too late now, as I won't
remove any of this.
Now I just need to find a good way to cut the FRP
--
Best regards
Peer Oliver Schmidt
the internet company
PGP Key ID: 0x83E1C2EA
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Best regards
Olly Schmidt
PGP Key ID: 0x18a9 3a1f 4196 bf22
'76a Eleganza II, VA
'73 Sequoia, SH, Germany
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| Re: [GMCnet] Insulation, measuring, nesting and cutting [message #284510 is a reply to message #284498] |
Mon, 10 August 2015 14:30 |
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thesmith
Messages: 589
Registered: February 2015
Location: Cary, NC
Karma: 6
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Peer, you got pictures? As you it know it didn't happen if there are no pictures 
Peer Oliver Schmidt wrote on Mon, 10 August 2015 13:39Yesterday I went ahead and tried to install the double layer of 0,75"
thick insulation.
No f* go. I was able to install a single layer of the 0,75" stuff, but
after having the first layer in, there was maybe room for 1/2 inch or
so. Sometimes even less.
I went ahead and bought some Reflectix stuff, that 0,25" thick and added
that to the whole ordeal.
Looks okay so far. I also found out, that a sharp knife is enough to cut
the foam insulation, no need for the hot knife setup. Live and learn.
Today or tomorrow will be the day of cutting the sheets for the ceiling.
If I remember correct, a rotary saw was the tool of choice for cutting
the FRP, wasn't?
--
Best regards
Peer Oliver Schmidt
the internet company
PGP Key ID: 0x83E1C2EA
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Cary, NC
1978 Center Kitchen Royale.
[Updated on: Mon, 10 August 2015 14:46] Report message to a moderator |
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| Re: [GMCnet] Insulation, measuring, nesting and cutting [message #284513 is a reply to message #284502] |
Mon, 10 August 2015 14:46 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Peer,
Considering your location, it probably won't help much, but the best tool
I've found for cutting FRP is the Harbor Freight electric shear. Cuts
straight or curves easily, cleanly and quickly.
A fine toothed saber saw does well also, but you should cut from the back
to minimize exposed chipping along the cut line.
If you're willing, you can even scribe straight cuts with a sharp knife,
then use a straight edge along the "keeper" side of the cut and break off
the excess.
Smaller round holes are best cut with a hole saw, with a piece of wood
behind the hole to minimize wallowing about of the center drill.
HTH,
Ken H.
On Mon, Aug 10, 2015 at 2:45 PM, Peer Oliver Schmidt
wrote:
> ...
>
> Now I just need to find a good way to cut the FRP
>
> --
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Insulation, measuring, nesting and cutting [message #284524 is a reply to message #284513] |
Mon, 10 August 2015 18:10 |
Olly Schmidt
Messages: 1265
Registered: February 2014
Location: Germany and Scottsville, ...
Karma: 8
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Senior Member |
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We used a circular saw. Worked okayish.
Unfortunately, the FRP isn't holding up at all without some stapleing or
something. I guess some got lucky, but it is probably to warm (even at
only 24C). We got the first in, but I'll need to attach it to the
ceiling with the (in another thread) mentioned bars. Will see how that
works out.
--
Best regards
Peer Oliver Schmidt
the internet company
PGP Key ID: 0x83E1C2EA
_______________________________________________
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Best regards
Olly Schmidt
PGP Key ID: 0x18a9 3a1f 4196 bf22
'76a Eleganza II, VA
'73 Sequoia, SH, Germany
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| Re: [GMCnet] Insulation, measuring, nesting and cutting [message #284525 is a reply to message #284375] |
Mon, 10 August 2015 18:44 |
<rallymaster
Messages: 361
Registered: May 2014
Karma: 2
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I used a sabre saw with the panel on a 4 x 8 table, making the cuts as
close to the edge of the table as possible. The trim that holds the
panels to the ceiling covers the wavers in the cuts. A table saw will
probably work, too, but I don't have all the adjustable supports and
rollers to hold that wimpy FRP in place while cutting. I can't cut a
really straight line with any kind of saw, be it sabre, table, band, or
hand-held circular type.
RonC
On Mon, 10 Aug 2015 14:45:27 -0400 Peer Oliver Schmidt
writes:
> Am 10.08.2015 um 13:56 schrieb A.:
>> Peer Oliver Schmidt wrote on Mon, 10 August 2015 12:39
>>> ...I was able to install a single layer of the 0,75" stuff, but
> after having the first layer in, there was maybe room for 1/2 inch
> or so.
>>> Sometimes even less. ...
>> Is the 0.75 stuff really 0.75, or closer to 1"?
>>
>> All the info I have read from other people that did it said the
> ribs were 1-1/2" deep.
>>
>> What's the R-value of the foam board you are using?
>
http://www.lowes.com/pd_304087-210-304087.0_1z11pq2__?productId=3122443&p
l=1
>
> I never checked the supposed size. Anyway, too late now, as I won't
> remove any of this.
>
> Now I just need to find a good way to cut the FRP
>
> --
> Best regards
>
> Peer Oliver Schmidt
> the internet company
> PGP Key ID: 0x83E1C2EA
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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>
Ron & Linda Clark
North Plains, ORYGUN
78 Eleganza II
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| Re: [GMCnet] Insulation, measuring, nesting and cutting [message #284530 is a reply to message #284498] |
Mon, 10 August 2015 20:31 |
Jim Miller
Messages: 501
Registered: March 2008
Karma: 10
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On Aug 10, 2015, at 1:39 PM, Peer Oliver Schmidt wrote:
>
> No f* go. I was able to install a single layer of the 0,75" stuff, but after having the first layer in, there was maybe room for 1/2 inch or so. Sometimes even less.
As long as the original spray-in foam has been completely removed It is possible to combine two different thicknesses of “blue board” and perfectly fill the space between the roof and the ribs. I’d have to go look at my notes but from memory the combination is 1/2” and 5/8”. Home Depot had both of them on the racks in the lumber department when I did my GMC.
Not sure why you tried a hot cutter? A sharp utility knife works flawlessly and there are no fumes.
The reflectix is almost worthless from an R-value perspective IMO. It reflects some portion of the IR that is incident upon it from each side but other than that it doesn’t contribute much to insulative value compared to foam. After going to the effort of removing the sprayed in insulation I certainly wouldn’t settle for one piece of isocyan foam with a piece of foiled bubble wrap under it.
--Jim "saving the lives of Onans...one unit at a time" Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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| Re: [GMCnet] Insulation, measuring, nesting and cutting [message #284531 is a reply to message #284513] |
Mon, 10 August 2015 20:47 |
Jim Miller
Messages: 501
Registered: March 2008
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> On Aug 10, 2015, at 3:46 PM, Ken Henderson wrote:
>
> Considering your location, it probably won't help much, but the best tool I've found for cutting FRP is the Harbor Freight electric shear. Cuts straight or curves easily, cleanly and quickly.
The shear sounds like a good idea Ken - did it result in any microcracks?. When I replaced my ceiling I used the “GMC Tool” and its toothed blade to slice the FRP sheet along a marked cut line. There’s an optimal oscillation frequency for doing this - too fast results in a smoked blade and too slow destroys the FRP.
--Jim "saving the lives of Onans...one unit at a time" Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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