Teardrops n Tiny Travel Trailers

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?

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)

3.25

Loose Fill

* Mineral fiber (rock, slag or glass)

2.2

* Cellulose (milled paper and wood pulp)

3.4

* Vermiculite, exfoliated

2.13

* Perlite, expanded

2.7
Rigid Board and Slabs

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

4.0

* Expanded polystyrene, extruded (smooth-cell surface)

5.0

* Expanded polyurethane, refrigerant 31 exp.

6.25

* Polyisocyanurate

7.04
Building Board Sheathing, regular density 2.64

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.

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.

pieface wrote:Hi
There is a guy in Bury who is selling tears on e bay http://cgi.ebay.co.uk/american-teardrop ... 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.
I think that camping in our weather conditions would need insulation and good ventilation. 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

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