Insulation query

Here is a generic building plan for a teardrop designed by the members of T&TTT.

Postby DasBaldGuy » Tue Sep 08, 2009 10:10 pm

Arne wrote:R value of 3/4 ply is .91 +/-....

the lowest I could find for 3/4 foam was R = 2.6

We are talking about the 3/4 inch "blue" styrofoam 4x8 sheets available at bigbox home improvement store, correct?
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Postby Arne » Wed Sep 09, 2009 8:29 am

I used pink, as that is what h/d had available.. I think the white with foil is higher..

R-Values Per Inch For Common Insulating Materials*

Insulating Material Avg. R-Value Per Inch
Batts or Blankets

* Mineral fiber (rock, slag or glass)


Loose Fill

* Mineral fiber (rock, slag or glass)


* Cellulose (milled paper and wood pulp)


* Vermiculite, exfoliated


* Perlite, expanded

Rigid Board and Slabs

* Expanded polystyrene, extruded (cut-cell surface) and molded bead-type


* Expanded polystyrene, extruded (smooth-cell surface)


* Expanded polyurethane, refrigerant 31 exp.


* Polyisocyanurate

Building Board Sheathing, regular density 2.64
I hope I never get too old to play (Arne, Sept 11, 2010)
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Postby eight433 » Wed Jan 27, 2010 1:20 pm

I used 3/4 plywood, AND 3/4 pink insulation on the walls. 2x2 rafters for the ceiling, with 1 1/2 white Styrofoam insulation in the roof, AND a fantastic fan with two windows. I had it outside the other night with a 10 dollar coil/fan heater and it would keep it HOT inside of that little camper. It was 18 degrees and windy that night. It got even better after I put weatherstrip around the doors.

IMO, you can never over insulate. I might even insulate my cabinets, as that is the only place I feel cold air yet.
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Re: Insulation query

Postby stmaryscowboy » Mon Jul 18, 2016 9:34 pm

Has anybody used the original 2X2 wall construction and used the spray in polyurethane in the walls, ceiling and in the floor? If so does it help with structural rigidity? I my way of thinking it would help in maintaining the temperature, humidity, noise and help make the frame more rigid. I would appreciate any input.
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Postby felixx » Mon Jul 18, 2016 11:45 pm

pieface wrote:Hi
There is a guy in Bury who is selling tears on e bay ... dZViewItem
if you look at his photos he appears to have used 3/4 ply and cut it out to lighten it and then insulated the voids. I'm not sure if I would want to go that route myself but every one to their own. :thinking:
I think that camping in our weather conditions would need insulation and good ventilation. :lol: Having said that I have been thinking about 3/4 ply and covering the interior with that thin cord carpet type material that they use on the inside of our buses.

pieface 8)

I did that.. cut voids and insulated em..
works well
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