3/4" Insulation Unavailable - What Now?

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3/4" Insulation Unavailable - What Now?

Postby mahai217 » Mon Jun 12, 2017 5:12 pm

So, I decided to build my TD with 1/4" skin, 3/4" skeleton and insulation, and 1/8" or 1/4" interior skin. I purchased Steve Frederick's Shop Manual and working through it and have even bought some of the lumber. I've tried sourcing the insulation but can not find any within 100 miles -- maybe more.

Any ideas? What about getting 1 1/2" and slicing it in half (thickness -- from 1 1/2" to two sheets of 3/4")? Any ideas on how to do this?

I live in the Boise, Idaho area.

Thanks again!

John
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Re: 3/4" Insulation Unavailable - What Now?

Postby lrrowe » Mon Jun 12, 2017 5:49 pm

This may be a silly question, but what about building with the 1 1/2 insulation. Thicker walls would mean better insulation and noise damping.
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Re: 3/4" Insulation Unavailable - What Now?

Postby tony.latham » Mon Jun 12, 2017 5:59 pm

mahai217 wrote:So, I decided to build my TD with 1/4" skin, 3/4" skeleton and insulation, and 1/8" or 1/4" interior skin. I purchased Steve Frederick's Shop Manual and working through it and have even bought some of the lumber. I've tried sourcing the insulation but can not find any within 100 miles -- maybe more.

Any ideas? What about getting 1 1/2" and slicing it in half (thickness -- from 1 1/2" to two sheets of 3/4")? Any ideas on how to do this?

I live in the Boise, Idaho area.

Thanks again!

John
:NC


Arghhhhhhhh....

Iv'e been there a couple of times. On my first search for 3/4" foamboard, there wasn't any here in Salmon and nothing in the Bitterroot Valley. We had a trip planned to Spokane and I found the 3/4" pink stuff in a Home Depot. On my third 'drop, I found it in a Home Depot in Missoula––they had it in beadboard with a foam backing.

Which leads me to the second teardrop I built, a little 4 x 8 for my sister. The skeleton was made from 1/2" AC plywood. Finding 1/2" pink board was easy.

Soooo... you might consider going that route.

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A skeleton made from 1/2" AC (I'd avoid the void-rich CDX) is fine for the skeleton wall with 1/4" sheathing. The other thought is purchasing 1" pinkboard and taking it down a quarter with a random orbital and 80 grit sandpaper after it's glued into your wall's holes. It won't take long. Just keep your vacuum nearby. 3/4" pinkboard is thicker than 3/4" plywood so you have to take this step anyway....

The only problem I had with my sis's walls were that the shelf the ceiling fits on is narrow. With a 3/4" skeleton, I can snap it down with my 1/4" crown stapler over a bead of glue. I was afraid to do that with the 1/2" skeleton––afraid it would split out. I ended up laying a bead of PL Premium down and nailing it down with skinny little nails. Works fine.

Tony
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Re: 3/4" Insulation Unavailable - What Now?

Postby greygoos » Mon Jun 12, 2017 6:23 pm

They sell 3/4 polystyrene insulation at Home Depot on Federal Way. They are 18 inches wide and 4 feet long. 6 to a pack. Somewhere around 10.00
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Re: 3/4" Insulation Unavailable - What Now?

Postby Redneck Packrat » Mon Jun 12, 2017 6:36 pm

3/4 is pretty common here, all the mom&pop type places stock that but not the thicker stuff. I'm building with 2" and am having the same problem finding enough of it in decent enough condition to use.
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Re: 3/4" Insulation Unavailable - What Now?

Postby martymcfly » Mon Jun 12, 2017 7:23 pm

BMC has it. I paid for it there on Franklin and picked it up out by Broadway. It was $23 a 4x8 sheet r-tech with foil on both sides.
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Re: 3/4" Insulation Unavailable - What Now?

Postby Kevin A » Mon Jun 12, 2017 9:24 pm

If all else fails, use 1/2" foam with a 1/4" or 6mm ply to fill the void.
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Re: 3/4" Insulation Unavailable - What Now?

Postby mahai217 » Tue Jun 13, 2017 8:32 am

lrrowe wrote:This may be a silly question, but what about building with the 1 1/2 insulation. Thicker walls would mean better insulation and noise damping.


Not a silly question. I'm just planning to build so I fill the voids of the skeleton with insulation. If I used 1 1/2" insulation I would have to use 1 1/2" skeleton.
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Re: 3/4" Insulation Unavailable - What Now?

Postby mahai217 » Tue Jun 13, 2017 8:33 am

martymcfly wrote:BMC has it. I paid for it there on Franklin and picked it up out by Broadway. It was $23 a 4x8 sheet r-tech with foil on both sides.


Thanks Marty! I will stop by!
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Re: 3/4" Insulation Unavailable - What Now?

Postby mahai217 » Tue Jun 13, 2017 8:35 am

Thanks for all of the ideas folks! You gave me a few things to think about. I appreciate you taking the time to share your knowledge and experience.

John
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Re: 3/4" Insulation Unavailable - What Now?

Postby elcam84 » Tue Jun 13, 2017 5:30 pm

Wow 3/4 is all the borgs here carry. Sometimes they have 1" but anything thicker is special order and very expensive. Unfortunately no Menards here.

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Re: 3/4" Insulation Unavailable - What Now?

Postby pchast » Tue Jun 13, 2017 8:19 pm

John,

Have yo looked at foamys at all... :thinking:
If you glue that 1.5 in. foam to the skins you will
only need some blocks to screw things too in the foam.
The skeleton would be unnecessary.
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Re: 3/4" Insulation Unavailable - What Now?

Postby mahai217 » Wed Jun 14, 2017 8:41 am

pchast wrote:John,

Have yo looked at foamys at all... :thinking:
If you glue that 1.5 in. foam to the skins you will
only need some blocks to screw things too in the foam.
The skeleton would be unnecessary.



:thumbsup: :thinking:
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Re: 3/4" Insulation Unavailable - What Now?

Postby elcam84 » Wed Jun 14, 2017 8:45 am

Well dont forget how sailboats are made. They are just foam with fiberglass on both sides... Why not do the same with a teardrop and eliminate the frame and use plywood instead of fiberglass. Even something like a heavy laminate on one side would add allot of strength but everything has to be glued well.

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Re: 3/4" Insulation Unavailable - What Now?

Postby QueticoBill » Wed Jun 14, 2017 2:55 pm

elcam84 wrote:Well dont forget how sailboats are made. They are just foam with fiberglass on both sides... Why not do the same with a teardrop and eliminate the frame and use plywood instead of fiberglass. Even something like a heavy laminate on one side would add allot of strength but everything has to be glued well.

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True. And why not just use fibreglass? It does depend on the adhesive.
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