Atlas Stucco-Shield insulating sheathing is a non-ozone depleting rigid, polyiso foam board with specially coated, patented facers on both surfaces specifically for use as a substrate for stucco and exterior insulation and finish systems (EIFS).
|R-VALUE1,2||NOMINAL BOARD THICKNESS|
1Conditioned thermal values were determined by ASTM Test Method C 518 at 75° mean temperature. Test specimens were conditioned in accordance with procedures outlined in ASTM C1289, Section 184.108.40.206.
2“R” means resistance to heat flow. The higher the R-value, the greater the insulating power.
3Other sizes available upon request. Contact your local Atlas sales office.
Apply Stucco-Shield directly to the exterior side of metal framing, wood framing or masonry construction.
Stucco-Shield less than 1ʺ in thickness must be installed over solid backing. Use code accepted shear or corner bracing in all cases, such as 1ʺ×4ʺ metal strapping or “let-in wood”. Stucco-Shield should be installed with the longest edge in a vertical position with edges on stud centers. Stud wall spacing of 16ʺ O.C. does not require horizontal support; however, 24ʺ O.C. stud spacing should have a horizontal 2ʺ×4ʺ at mid-height to support the Stucco-Shield. Each board must be attached with galvanized or other corrosion-resistant fasteners with minimum 1 1/4ʺ diameter rigid washer caps. Suitable fasteners should be placed no closer than 3/8ʺ to the perimeter edges of Stucco-Shield , spaced 12ʺ O.C. on all perimeters, including the top and bottom, as well as in the field of the board. Because the washer caps may extend beyond the edge of the board, it is better to butt the second board to the first board prior to nailing either one of the adjacent edges. Do not overdrive fasteners. Smooth shank fasteners (12 gauge min.) must penetrate wood studs a minimum of 1 1/2ʺ. Wood screws and ring shank nails (12 ga. min.) must penetrate wood studs a minimum of 1ʺ. Metal studs must be penetrated 3/4ʺ with self tapping screws.
Caulking (as specified by the EIFS system manufacturer) should be used to seal field cut irregularities at joints and around wall penetrations to ensure a closed surface for the penetrations to ensure a closed surface for the polymer stucco base coat. All requirements for control of thermal, mechanical, and/or structural movement must be as required by the synthetic stucco coatings manufacturer. Horizontal control joints are needed at floor junctures to compensate for construction lumber shrinkage. Be sure to consult the coating manufacturer.
Although Stucco-Shield is weather resistant, it should be coated with the system base coat within 2 weeks of installation. In the event Stucco-Shield becomes moist prior to application of the base coat, it must be allowed to completely air dry to ensure proper adhesion of the base coat. Keep dust and all other contaminants off the surface of Stucco-Shield.
Avoid unequal stress on the exterior walls by making sure all roofing materials are distributed equally on the roof and distribution of all interior gypsum board is completed prior to application of the base coat.
Atlas requires full mesh reinforcement in the base coat for best impact resistance and total system performance. Follow coating manufacturer’s instructions regarding reinforcement mesh application. Expansion control joints are required at each floor level to accommodate the inherent movements of the framing materials.
|PROPERTY||TEST METHOD||TEST METHOD MINIMUM REQUIREMENTS|
|FLAME SPREAD||ASTM E84||<75|
|SMOKE DEVELOPMENT||ASTM E84||<450|
|MOISTURE VAPOR TRANSMISSION
(ASTM E96 DESICCANT METHOD)
|ASTM E96||1.2 Perm at 1-inch|
|WATER ABSORPTION||ASTM C209||<1% by Volume
*Typical Results <0.5% by Volume
|DIMENSIONAL STABILITY||ASTM D2126||<2% Linear Change
*Typical Results <1% Linear Change
|SERVICE TEMPERATURES||–||-100°F to +250°F
(-73°C to 122°C)
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. For questions, please contact Atlas’s technical department.
- International Building Code (IBC), Section 1404.2 (ESR-1375)
- International Residential Code (IRC), Section R703 (ESR-1375)
- BOCA National Building Code, Section 1404.3 (ESR-1375)
- Standard Building Code, Section 2303.3 (ESR-1375)
- Uniform Building Code, Section 1402.1 & 2506.4 (ESR-1375)
- Federal Specification, HH-I-1972
- ASTM C1289 Type II, Class 2
- CCMC Evaluation Report, #12423-L (EnergyShield® CGF), #12422-R (EnergyShield®); (Meets CAN/CGSB 51.86-M86-Type 2)
- Miami-Dade County Product Control Approved, Miami-Dade County, Florida, NOA No. 08-0111.01, 4/14/13
- California State Insulation Quality Standards and Title 25 Foam Flammability Criteria – #TC 1231
- CAN/ULC S704-01, Type 2, Class C
Stucco-Shield can be used as part of a WRB and potentially part of an air barrier assembly. Stucco-Shield has passed ASTM E2357 as a component of an air barrier assembly. In these types of assemblies it is required that all joints, penetrations, and openings be taped or sealed by other means. Atlas recommends flashing Stucco-Shield into rough openings and other building transitions. The foil facers are compatible with most flashing or sheathing tape, joint fillers, sealants, and adhesives. Consult the product manufacturer for specific compatibility.