The Tennessee Log Homes standard roof insulation in a Premier Roof System consists of one 4-inch layer of Atlas AC-Foam II Polyiso Insulation (bottom layer), and one 1.5 inch layer of Falcon Type I EPS Insulation with ridges and valleys as a ventilation mechanism (top layer).  The two layers are glued together with Elmer's Wood Glue strictly for convenience to the builder to allow him to install the two layers in one step.

The Manufacturer's Web Address is http://www.atlasroofing.com/

Manufacturer's Information on the two products is listed below:

 

Atlas AC-Foam II Polyiso Insulation (bottom layer)

ACFoam Typical Physical Properties*
PROPERTY

TEST METHOD

TYPICAL RESULTS
Dimensional Stability (Length and Width) ASTM D 2126 Less than 2 %
Compressive Strength (10% Deformation) ASTM D 1621 20 PSI (140 kPa)
Water Absorption ASTM C 209 ASTM D 2842 < 1 % < 3.5 %
Moisture Vapor Transmission ASTM E 96 < 1.5 perm (85.0ng/ (Pa•s•m2))
Product Density ASTM D 1622 Nominal 2.0 pcf
Flame Spread ASTM E 84 (Full 10 min. Test) 25-50**
Smoke Developed ASTM E 84 (Full 10 min. Test) 50-170**
Tensile Strength ASTM D 1623 >730 psf (35 kPa)
Service Temperature - -100 to 250ºF (-73 to 122ºC)
* The physical properties listed above are presented as typical average values as determined by accepted ASTM test methods and are subject to normal manufacturing variation. This data is offered as a service to our customers and is subject to change. All information can be confirmed by contacting Atlas’s Technical Department.

** The numerical ratings as determined by ASTM Test Method E 84 are not intended to reflect hazards presented by this or any other material under actual fire conditions. A flame spread index of 75 or less meets code requirements regarding flame spread for foam plastic roof insulation. However, flame spread values are not required for foam plastic insulation used in roof deck constructions that comply as an assembly with FM 4450 or UL 1256 (see IBC, BOCA, SBCCI, and ICBO model building codes, Chapter 26). Smoke Developed values do not apply to roofing.

 

 
 CODES & COMPLIANCES

  • Federal Specification HH-I-1972/GEN and HH-I-1972/2,  Class 1 have been cancelled.
  • ASTM C 1289, Type II, Class 1.
  • Miami-Dade County, Florida Product Control No. 00-0208.04.
  • NYC MEA #107-01-M.
  • California State Insulation Quality Standards and Title 25 Foam Flammability Criteria (License #TC 1231).
  • IBC, NBC, UBC and SBC Sections on Foam Insulation (Chapter 26).
  • CCMC No. 12464-L.
  • CAN/CGSB-51.26-M86.
  • CAN/ULC-S704.

FM Standard 4450/4470 Approval
ACFoam-II is approved for Class 1 insulated steel, wood, concrete and gypsum roof deck construction for 1-60 and 1-90 Windstorm Classifications (may be mopped or mechanically fastened to concrete roof decks). Refer to FM Approval Guide for details on specific systems.

UL Standard 1256 Classification
Insulated metal deck construction assemblies - Construction #120 and #123.

UL Standard 790 (ASTM E 108) Classification
Class A with most roof membrane systems. See UL Roofing Materials & Systems Directory.

UL Standard 263 Fire Resistance Classification (ASTM E 119)
Some classifications for fire resistance are P225, P230, P259, P508, P510, P514, P519, P701, P710, P713, P717, P718, P719, P720, P722, P723, P724, P725, P727, P728, P729, P730, P732, P801, P814, P815, P818, P819, and P828. See UL Fire Resistance Directory for updated listings.

UL Standard 1897 Uplift Resistance
120 psf, 150 psf, 165 psf, 245 psf.

UL Certified for Canada

UL of Canada
Insulated Roof Deck Assemblies - Construction #C34.
CAN/ULC-S126-M86, CAN/ULC-S101-M89, CAN/ULC-S107-M87


 Spec this Product
 
 

 

 RECOMMENDED USES

ACFoam-II is typically specified for hot asphalt or coal tar BUR, modified bitumen, metal and single-ply membrane systems. ACFoam-II has one side marked for hot BUR and modified bitumen applications and one unmarked side for single ply and cold-applied modified bitumen applications, making this an almost universally adaptable product suitable for a variety of applications. ACFoam-II is a closed-cell, polyiso core integrally laminated to heavy black (non-asphaltic), fiber-reinforced felt facers. ACFoam-II is also available in 25-psi formula. Available in 4´ x 4´ (1220mm x 1220mm) and 4´ x 8´ (1220mm x 2440mm) panels.


 
 

 WARRANTY

 

In response to valid concerns of building designers regarding thermal efficiency of roof assemblies and the long-term insulating value of roof insulation, Atlas offers a 20-year, limited thermal warranty. The "ACFoam" Limited Warranty places Atlas ACFoam products above all others and supports the building owner, designer and contractor by backing up thermal performance. This warranty is available to the building owner at the time the building is completed and is transferable to any subsequent owner for the duration of the 20-year period.

 20 Year Limited Warranty
 
 

 STORAGE

Storage/Precautions: Factory-applied packaging is intended only for protection during transit. When stored outdoors or on the job site, packages should be stacked on pallets at least four inches above ground level and completely covered with a weatherproof covering such as a tarpaulin. The temporary factory-applied packaging should be slit or removed to prevent accumulation of condensation. Roof insulation which has become wet or damaged should be removed and replaced with solid, dry insulation.

Warning! Do Not Leave Exposed: This product is a polyiso organic plastic foam and will burn if exposed to an ignition source of sufficient heat and intensity, or open flame, such as a welder´s torch. Like other organic materials, this product will release smoke if ignited. Do not apply flame directly to ACFoam roof insulations. This product should be used only in strict accordance with Atlas recommended uses and application instructions.


 

 INSTALLATION

ACFoam® General Installation Instructions
Before installation begins, the roof deck should be firm, well attached, even, clean and dry. Proper attachment of the insulation is necessary to prevent roof failures. Atlas will not be responsible for any damage caused by improper attachment. Atlas Roof Insulation products can be attached to decks that are approved by Factory Mutual and local codes. Atlas is not responsible for determining the suitability of the deck. ATLAS ROOF INSULATION PRODUCTS SHALL BE KEPT DRY BEFORE, DURING AND AFTER INSTALLATION.  Although Atlas Roof Insulation has been designed to withstand normal foot traffic, protection from damage by construction traffic and/or abuse is extremely important. Roof surface protection such as plywood must be used in areas where storage and staging are planned and heavy or repeated traffic is anticipated during or after installation.
(See Technical Bulletin #00-01)

Moisture/Vapor Control
Vapor retarders are used to impede the passage of water vapor into roofing systems, thereby preventing condensation and resulting damage to the insulation and roof system. All Atlas Roof Insulation Products may be installed with or without a vapor retarder, the need for which is determined by the designer. The designer may consult the NRCA Roofing and Waterproofing Manual for guidance in determining the need for a vapor retarder. Special consideration should be given to construction-generated moisture, as well.  For example, construction-generated moisture, such as will be released by placing concrete floor slabs after the roof has been installed, can drive large quantities of moisture into the roof system. Therefore, Atlas cannot be responsible for damage to the insulation when exposed to construction-generated moisture. Refer to the NRCA Roofing and Waterproofing Manual for their recommendations for the use of a vapor retarder when construction-generated moisture is present (4th Edition, Volume 1, p. 121). Refer to Atlas Technical Bulletin #00-01.

 
Complete Instructions
 
 

 

Long-Term Thermal Resistance*

THICKNESS

LTTR-VALUE

RSI

METAL
DECK FLUTE SPANABILITY

IN

MM

IN

MM

1.0
1.1
1.2
1.3
1.4

25.40
27.94
30.48
30.02
35.56

6.0
6.6
7.2
7.8
8.4

1.06
1.16
1.27
1.37
1.48

2 5/8"
4 3/8"
4 3/8"
4 3/8"
4 3/8"

66.675
111.125
111.125
111.125
111.125

1.5
1.6
1.7
1.8
1.9

38.10
40.64
43.18
45.72
48.26

9.0
9.6
10.3
10.9
11.5

1.58
1.69
1.81
1.92
2.02

4 3/8"
4 3/8"
4 3/8"
4 3/8"
4 3/8"

111.125
111.125
111.125
111.125
111.125

2.0
2.1
2.2
2.3
2.4

51.80
53.34
55.88
58.42
60.96

12.1
12.8
13.4
14.0
14.7

2.13
2.25
2.36
2.46
2.59

4 3/8"
4 3/8"
4 3/8"
4 3/8"
4 3/8"

111.125
111.125
111.125
111.125
111.125

2.5
2.6
2.7
2.8
2.9

63.50
66.04
68.58
71.12
73.66

15.3
15.9
16.6
17.2
17.9

2.69
2.80
2.92
3.03
3.15

4 3/8"
4 3/8"
4 3/8"
4 3/8"
4 3/8"

111.125
111.125
111.125
111.125
111.125

3.0
3.1
3.2
3.3
3.4

76.20
78.74
81.28
83.82
86.36

18.5
19.1
19.8
20.4
21.1

3.26
3.36
3.48
3.59
3.71

4 3/8"
4 3/8"
4 3/8"
4 3/8"
4 3/8"

111.125
111.125
111.125
111.125
111.125

3.5
3.6
3.7
3.8
3.9
4.0

88.90
91.44
93.98
96.52
99.06
101.60

21.7
22.4
23.0
23.7
24.3
25.0

3.82
3.94
4.05
4.17
4.28
4.40

4 3/8"
4 3/8"
4 3/8"
4 3/8"
4 3/8"
4 3/8"

111.125
111.125
111.125
111.125
111.125
111.125

*Long-term thermal resistance values were determined in accordance with CAN/ULC-S770. All test samples were third-party selected and tested by an accredited material testing laboratory.

 

Falcon Type I EPS Insulation

 
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