BW Stretch System™
The BW Stretch System™ is the ultimate vertical backup wall system, providing superior air, water, thermal and vapor protection in an all-in-one barrier component. It can be vertically installed with a variety of exterior rainscreen systems and can span up to 6 ft. o.c. This unique insulated metal panel stretch span wall system introduces new standards when it comes to cost savings, design integrity, and sustainability. The BW Stretch System eliminates the need for multiple work crews as it is easily and quickly installed in a single step. The stretch span wall system not only expedites close-in and dry-in building times, but rather reduces the likelihood of improper installation as well.
| Coverage Width | 30”, 36” |
| Thermal Values – R-Value & U-Factor | U-Factor(BTU/h-ft2*fahrenheit) Panel Width: 36″ at 35 degrees 2″ = 0.063 2.5″ = 0.046 4″ = 0.034 R-Value (h*ft2*F/BTU) Panel Width: 36″ at 35 degrees 2″ = 16.7 2.5″ = 23.0 4″ = 33.5 |
| Finishes | Exterior Face: G-90 galvanized steel in 22 Ga. with epoxy primer finish Exterior Profile: No profile, unembossed Interior Face: G-90 galvanized in 26 Ga. with epoxy primer finish Interior Profile: Shallow Planked, nominal 3/64” deep, unembossed |
| Joint | Double tongue-and-groove |
| Core | Foamed-in-place polyisocyanurate |
| Length | 12’-0” or 20’-0” Vertical |
| Thickness | 2”, 2 ¾”, 4” |
Design Features and Benefits
- Provides air, water, thermal and vapor barrier in one step
- Can use multiple façade options while not reducing thermal efficiency
- Easy and fast installation, with reduced construction and labor costs
- Encloses the building faster in all weather conditions
- Can span up to 6ft on center
Download Our Literature
Metl-Span® BW Stretch System™ For Commercial & Industrial Buildings
2012 Master Format™ Section
All specifications and designs are subject to change without notice.
Load Span Tables
The Load Span Tables below are based on Allowable Stress Design (ASD). For loads calculated based on ASCE 7-10 (LRFD), please refer to section 2.4.1 of ASCE 7-10 for the applicable load combinations using Allowable Stress Design.
For FM Global Requirements, click here
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TESTING: BW Stretch System™
| Test/Approval | Test Method | Test Title | Results |
|---|---|---|---|
| Fire US | ASTM E84 | Surface Burning Characteristics of Building Materials | Flame Spread < 25, Smoke Developed < 450 |
| NFPA 259 | Test Method for Potential Heat of Building Materials | Potential heat of foam plastic insulation contained in the assembly tested in accordance with NFPA 285 | |
| NFPA 285-19 | Evaluation of Fire Propagation Characteristics of Exterior Non-Load Bearing Wall Assemblies | Representative mockup tested in accordance with NFPA 285-19. Contact Metl-Span for complying wall assemblies | |
| Fire Canada | CAN/ULC S101 | Fire Endurance Tests of Building Construction and Materials | Meets Acceptance Criteria per the National Building Code of Canada |
| CAN/ULC S102 | Surface Burning Characteristics of Building Materials and Assemblies | Meets the National Building Code of Canada requirements | |
| CAN/ULC S134 | Fire Test of Exterior Wall Assemblies | Meets Acceptance per the National Building Code of Canada. Testing preformed on panel only | |
| Structural | ASTM E72 | Standard Test Methods of Conducting Strength Tests of Panels for Building Construction | See load/span tables |
| Thermal Performance | ASTM C518 | Steady-State Thermal Transmission Properties by Means of the Heat-Flow Meter Apparatus | K-Factor of 0.119 BTU.in/hr.ft2.°F at 35° F mean core |
| ASTM C1363 | Thermal Performance of Building Materials and Envelope Assemblies | See Thermal Performance Guide | |
| Air Infiltration | ASTM E2357 | Rate of Air Leakage Through Curtain Walls Under Specified Pressure Differences | Meets Acceptance Criteria per the International Energy Conservation Code and the National Energy Code of Canada. Maximum Air Infiltration Rate of 0.004 cfm/sq. ft. at a static-air-pressure difference of 1.57 psf |
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