Advantages in Thermal Performance
There are many conflicting claims being made for energy-efficient products these days. All Thermo-ply performance claims are based on certified independent laboratory tests.
Compare Thermo-ply performance against other sheathing products.
An important job of a sheathing product is to control air infiltration. This why Thermo-ply outperforms sheathing products which claim to deliver extra R-Value.
Energy Savings.
Thermo-ply is a unique product. It offers significant energy savings by reducing energy-robbing air infiltration, and by adding R-Values.
R-Values.
R-Value is the way insulating products are rated, but R-Values do not measure sheathing performance. One of the most important factors to consider is the sheathing's ability to do its basic job of controlling heat loss or gain caused by air moving or infiltrating through the walls into the insulation. Thermo-ply retains a much larger percentage of the wall system's R-Value than other sheathing products, which lose over 50% of that R-Value in only a 10 mph breeze.
Thermo-ply wall sheathing controls air infiltration better than any other sheathing on the market. That's why Thermo-ply outperforms sheathing products which claim to deliver extra R-Values. The percentages shown below show the retained, effective R-Value for wall sections built with all components being the same EXCEPT the sheathing. This summary on effective R-Values is based on air infiltration tests run by an independent laboratory with industry-accepted methods (ASTM E-283), and further supported by the 1984 Department of Energy report.*
The total static R-Value for a Thermo-ply sheathing system is a combination of the R-Value of Thermo-ply itself and that of the reflective airspace between the sheathing and the siding. The chart on page 5 shows the total R-Value resulting from both these factors for various airspace sizes, using typical siding components.
R-Value Analysis**
| Sheathing |
Calculated or Static "R"
Without 10 mph Wind |
Effective "R" When Exposed
to Simulated 10 mph Wind |
Percentage of Retained
Effective R-Value |
| Thermo-ply |
15.6 |
11.8 |
75.6% |
| 1" Dow Foam (StyrofoamTM) |
20.0 |
11.3 |
56.5% |
| 1" Foil Faced Urethane Foam |
23.4 |
10.5 |
44.9% |
| 1" EPS Foam |
18.67 |
10.8 |
57.8% |
| 1/2" Fiberboard |
15.99 |
8.15 |
51.0% |
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* "Affordable Manufactured Housing Through Energy Conservation," U.S. Department of Energy (DOE), July 1984.
**R-Values of wall sections include aluminum siding, sheathing, airspace, air films, and an assumed R-13 kraft-faced batt insulation.
NOTE: R-Value means resistance to heat flow. The higher the R-Value the greater the insulating power.
Thermo-ply Alone and System R-Values
(These R-Values for Heat Flow Horizontal Only with Thermo-ply Used on Vertical Walls)
R-Values of walls with Thermo-ply construction and brick veneer.
R-Value
A. 0.68 Inside Air Film
B. 0.45 1/2" Gypsum
C. 0.00 Kraft (Asphalt Coated) or Polyethylene Vapor Barrier
D. 13.00 R-13 Fiberglass Insulation
E. 0.20 Thermo-ply
F. 3.50 3/4" Reflective Airspace
G. 0.41 Brick Veneer
H. 0.17 Outside Air Film
18.41 TOTAL R-VALUE
0.0543 TOTAL U-VALUE
Note: Use a wood strip or equivalent to seal off top of airspace
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R-Values of walls with Thermo-ply construction and hardboard siding.
R-Value
A. 0.68 Inside Air Film
B. 0.45 1/2" Gypsum
C. 0.00 Kraft (Asphalt Coated) or Polyethylene Vapor Barrier
D. 13.00 R-13 Fiberglass Insulation
E. 0.20 Thermo-ply
F. 1.33 Variable Reflective Airspace
G. 0.67 Hardboard Siding
H. 0.17 Outside Air Film
16.50 TOTAL R-VALUE
0.0606 TOTAL U-VALUE
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R-Values of walls with Thermo-ply construction and backed aluminum siding furred out.
R-Value
A. 0.68 Inside Air Film
B. 0.45 1/2" Gypsum
C. 0.00 Kraft (Asphalt Coated) or Polyethylene Vapor Barrier
D. 13.00 R-13 Fiberglass Insulation
E. 0.20 Thermo-ply
F. 3.50 3/4" Furring Strip with Reflective Airspace
G. 1.82 Aluminum Siding with Backer
H. 0.17 Outside Air Film
19.82 TOTAL R-VALUE
0.0504 TOTAL U-VALUE
Note: When siding is furred out, be sure to use horizontal strips on the top and bottom of the wall to seal the airspace.
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| Type Siding Used (See Notes Below) |
R-Value of Thermo-ply Alone |
Average R-Value of Reflective Foil Airspace |
Average System R-Value* for Thermo-ply Plus One Reflective Foil Airspace Between Thermo-ply and Siding |
| Lapped Sidings-Aluminum, Vinyl, Hardboard, Wood, etc.** |
0.2 |
1.33 |
1.53 |
| Brick Veneer and Furred-Out Siding with 3/4" Airspace*** |
0.2 |
3.5 |
3.7 |
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*Thermo-ply Reflective Foil System R-Values are ONLY for the Thermo-ply and the reflective foil airspace between Thermo-ply and siding. Insulation was in complete contact with inside of Thermo-ply for test. R-Values for siding, cavity insulation, gypsum and air film corrections ARE NOT INCLUDED in Thermo-ply System R-Values since many combinations are possible, but they can be added to Thermo-ply System R-Value to obtain TOTAL WALL R-Value. all tests were run according to ASTM C-236 at 75 deg. F mean temperature, 30 deg. F temperature differential.
** These lapped horizontal sidings form a variable reflective foil airspace with one foil surface on the Thermo-ply. This airspace varies between zero and the thickness or depth of the siding.
***Brick veneer is installed with 3/4" airspace. Siding must be spaced out 3/4" with furring strips. The airspace is a reflective foil airspace with one foil surface.
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