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Fastening Information for Atlas Nail Base Fasteners
ACFoam® Nailable Insulations: 4' x 8' (1220mm x 2440mm)
APPROVED DECKS:
- 18–22 ga. Steel Deck (3/4” through deck [top flange])
- Structural Concrete (2500 psi min.) 3/16” pre-drilled pilot hole required (1” penetration into deck)
- 1" minimum Wood Plank and T & G (1” penetration into deck)
- 19/32" minimum plywood (1/2” through deck)
FM 1-60, 1-90, 1-105: 15 Fasteners (min.) for CrossVent, CrossVent RB and Nail Base Insulation (Steel Deck and Structural Concrete)
For projects requiring FM wind rating, FM approved assembly, including deck and roof covering, is required.
Atlas Nailbase Fastener Installation Recommendations
- The fasteners should be installed using an 1800-2500 RPM (max.) screw gun with a hardened drive bit. Standard electric drill guns are not recommended for installation of Atlas Nail Base Fasteners.
- Metal decks are acceptable deck types provided they are between 18 ga. (max.) and 22 ga. (min.). Be sure to determine the gauge of the deck. For 16 ga. or heavier, consult the Atlas Technical Department.
- The roof perimeter area is defined as a band equal in width to 10% of the lesser plan dimension or 40% of the mean roof height. (Minimum band width is 4 ft.)
Required Number of Atlas Nail Base Fasteners - Table 1
| Roof Slopes | Roof Area | 3:12/6:12 | 7:12/12:12 | 14:12/24:12 | ||||||||||||||||||
| Snowload +10 PSF Dead Load=Total Load PSF | 10-30 | 40 | 50 | 60 | 70 | 80 | 90 | 10-30 | 40 | 50 | 60 | 70 | 80 | 90 | 10-30 | 40 | 50 | 60 | 70 | 80 | 90 | |
| 18-22 ga. Steel | Field | 15 | 15 | 15 | 15 | 15 | 15 | 20 | 15 | 20 | 20 | 20 | 25 | 25 | 30 | 20 | 25 | 30 | 30 | 35 | 35 | 40 |
| Perimeter | 25 | 25 | 25 | 20 | 20 | 20 | 20 | 20 | 20 | 25 | 25 | 25 | 25 | 30 | 20 | 30 | 30 | 30 | 35 | 40 | 40 | |
| 1" Wood or Structural Concrete | Field | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 20 | 20 | 20 | 25 | 25 | 15 | 20 | 25 | 25 | 30 | 30 | 35 |
| Perimeter | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 15 | 20 | 20 | 20 | 20 | 25 | 25 | 15 | 25 | 25 | 30 | 30 | 35 | 35 | |
| 19/32" Plywood Minimum | Field | 15 | 15 | 15 | 20 | 20 | 25 | 25 | 15 | 25 | 25 | 25 | 30 | 35 | 40 | 20 | 30 | 35 | 40 | 45 | 45 | 50 |
| Perimeter | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 20 | 25 | 30 | 30 | 30 | 35 | 40 | 20 | 35 | 35 | 40 | 45 | 45 |
50 | |
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1. Table 1 applies to roofs in areas of wind velocity not exceeding 110 mph, Exposure C, Importance Factor I =1.15, and maximum mean roof height of 60 feet. For overhangs, consult Atlas's Technical Department. 2. Table 1 is valid only for use with Atlas Nail Base Fasteners. 3. Refer to pp. 26-28 for appropriate fastening patterns. 4. When plywood is used as the top surface of the ACFoam® nailable insulations, additional fastening is required. 5. The roof perimeter area is defined as a band equal in width to 10% of the lesser roof plan dimension or 40% of the mean roof height, whichever dimension is less (Minimum band width is 4ft.). Note: Perimeter area also includes corners. |
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Required Number of Atlas Nail Base Fasteners - Table 2
| Roof Slopes | Roof Area | 3/12 | 4/12 | 5/12 | 6/12 | 7/12 | 8/12 | 9/12 | 10/12 | 11/12 |
| 18-22 ga. Steel | Field | 25 | 25 | 25 | 25 | 30 | 30 | 30 | 30 | 30 |
| Perimeter | 45 | 45 | 45 | 45 | 35 | 35 | 35 | 35 | 35 | |
| 1" Wood or Structural Concrete | Field | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 |
| Perimeter | 35 | 35 | 35 | 35 | 25 | 25 | 25 | 25 | 25 | |
| 19/32" Plywood Minimum | Field | 20 | 20 | 20 | 20 | 25 | 25 | 25 | 25 | 25 |
| Perimeter | 40 | 40 | 40 | 40 | 30 | 30 | 30 | 30 | 30 | |
| Roof Slopes | Roof Area | 12/12 | 14/12 | 15/12 | 16/12 | 17/12 | 18/12 | 20/12 | 22/12 | 24/12 |
| 18-22 ga. Steel | Field | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 |
| Perimeter | 35 | 35 | 35 | 35 | 35 | 35 | 35 | 35 | 35 | |
| 1" Wood or Structural Concrete | Field | 20 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
| Perimeter | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | |
| 19/32" Plywood Minimum | Field | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
| Perimeter | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | |
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1. Table 2 applies to roofs with no snow load and wind velocity over 110 mph, but not exceeding 146 mph, in combination with 10 psf Dead Load, Exposure C, Importance Factor I=1.15 and maximum mean roof height of 60 feet. For overhangs, consult Atlas's Technical Department. 2. Table 2 is valid only for use with Atlas Nail Base Fasteners. 3. Refer to pp. 26-28 for appropriate fastening patterns. 4. When plywood is used as the top surface of the ACFoam® nailable insulations, additional fastening is required. See Technical Update dated 01/04/11. 5. The roof perimeter area is defined as a band equal in width to 10% of the lesser roof plan dimension or 40% of the mean roof height, whichever dimension is less (Minimum band width is 4ft.). Note: Perimeter area also includes corners. |
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