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ZIP System R-Sheathing


  • 1
    IS R-SHEATHING A SIP, STRUCTURALLY INSULATED PANEL?

    No. R-Sheathing is not a SIP. It is a ZIP System sheathing panel with a polyiso foam adhered to the non-overlay side that can be attached to conventional wood-framed construction.


  • 2
    WHY DID WE CHOOSE TO USE POLYISOCYANURATE FOAM?

    Polyisocyanurate has the highest R-Value per inch (R6/inch) of standard rigid foam sheathings.


  • 3
    WILL THE FOAM SHRINK OVER TIME?

    The dimensional stability of the foam is <4% in thickness and <2% in length and width when tested by ASTM D 2126.


  • 4
    CAN ZIP SYSTEM R-SHEATHING BE USED ALONG THE COASTAL AREAS OF THE U.S.?

    Yes. However, any structure located in a coastal area that has a basic wind speed of 100 mph or greater and is using R-Sheathing to resist the wind loading, must be designed by a design professional as a shear wall. Prescriptive wall bracing methods can not be used in this situation.


  • 5
    WHAT IS THE PERMEANCE OF R-SHEATHING?

    R-sheathing is a multi layered product. The combined system permeance is 0.8-1.1 perms. The permeance of each layer when measured by ASTM E 96 Procedure B (Wet Cup) is as follows: • WRB Overlay 12-16 perms • 7/16” OSB 2-3 perms • Coated Glass Facer 45-50 perms • 1” Polyisocyanurate 1.5-2 perms • Coated Glass Facer 45-50 perms


  • 6
    HOW SHOULD R-SHEATHING BE STORED AT THE JOB SITE?

    For temporary job-site storage, units should be stacked on pallets at least 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.


  • 7
    WHERE IS THE DEW POINT WHEN USING THESE PANELS?

    Condensation occurs when the air cools down below its saturation temperature, i.e. the temperature of air which allows a maximum amount of water to be contained in vapor phase without a condensation. This temperature is referred to as dew-point temperature. Hence, condensation occurs whenever the air touches a surface that is colder than its dew point temperature. Within a wall assembly, the most common condensation point is the inboard surface of the exterior sheathing and it occurs in the winter time. ZIP System R-Sheathing adds a layer of insulation that creates a thermal break between indoor and outdoor environment, effectively “warming” the exterior surface of a wall cavity and reducing the risk of condensation within the wall system.


  • 8
    WHAT IS A BRACED WALL PANEL

    A Braced Wall Panel is a full-height section of a braced wall line. Only portions of a braced wall line actually resist lateral loading. Those portions that do the work are the braced wall panels. The building code specifies what percentage of a braced wall line has to be made up of braced wall panels.


  • 9
    WHAT IS THE DIFFERENCE BETWEEN PRESCRIPTIVE AND PERFORMANCE METHODS OF WIND AND SEISMIC RESISTANCE?

    Prescriptive Construction methods are found in the IRC and IBC and have limitations on the number or stories, wind and seismic zones. Performance (engineered) method is found in the IBC only and has no limitation on wind or seismic and can be any shape or size within IBC limits. Performance (engineered) requires a design professional. Prescriptive Construction does not


  • 10
    ARE THE AIR BARRIER AND WRB PROPERTIES DIFFERENT WHEN COMPARED TO REGULAR ZIP SYSTEM?

    No. The same WRB and air barrier properties are the same for R-Sheathing as they are for conventional ZIP System sheathing.


  • 11
    Do all Nail Penetrations need to be Sealed?

    Like conventional ZIP System sheathing, this is only a concern with the 12” o.c. field nailing because all of the fasteners at the panel edges are taped over anyway. Over-driven fasteners only need to be sealed or taped over if a hole is created all the way through the ZIP panel. Examples would be if a pneumatic nail were shot all the way through or if a nail was removed leaving a hole.


  • 12
    What is A Water-Resistive Barrier?

    A water-resistive barrier is a secondary line of defense against water penetrating into the wall system – the primary defense being the exterior wall cladding. While some think it only serves to protect the walls during the construction process, this barrier must perform even after the siding/exterior cladding is installed.


  • 13
    Can ZIP System R-Sheathing be used in construction types other than Type V?

    No. R-sheathing is comprised of a combustible wood structural panel. Therefore, Type V construction is the only construction type where it can be used.


  • 14
    HOW SHOULD R-SHEATHING BE STORED AT THE DISTRIBUTION OR RETAIL CENTER?

    Packaged units must be stored indoors or within a covered structure.


  • 15
    DOES THE R-VALUE OF THE FOAM DIMINISH OVER TIME?

    Polyiso has a Long Term Thermal Resistance (LTTR) of R6 per inch. LTTR is a scientifically supported method to calculate the 15-year, time-weighted average R-value. It is measured by ASTM C 1303. Can this be written as, “It is common for exterior insulations to lose some small amount of R-value overtime. The listed R-value for ZIP System R-sheathing is a 15-year average which means the R-value at time of installation is actually higher than what is published.”


  • 16
    WHERE ARE HURRICANE PRONE REGIONS?

    Hurricane Prone Regions are defined by the IRC as the U.S. Atlantic Ocean and Gulf of Mexico coasts where the basic wind speed is greater than 90 mph, and Hawaii, Puerto Rico, Guam, Virgin Islands and America Samoa.


  • 17
    DOES ZIP SYSTEM R-SHEATHING HAVE A REQUIRED ASPECT RATIO?

    Yes, ZIP System R-Sheathing is limited to a 2:1 aspect ratio for shear wall designs.


  • 18
    WHAT’S THE DIFFERENCE BETWEEN THE IRC, IBC AND THE IECC?

    IRC; International Residential Code – Applies to single-family, duplexes and townhomes. IRC is limited to areas where the ground wind speed (3-sec gust) is less than 110 mph or 100 mph in hurricane prone regions. IBC; International Building Code – Applies to buildings and structures not defined in the IRC. IECC; International Energy Conservation Code – Applies to both residential and commercial construction and includes measures to improve the efficiency of the thermal envelope, HVAC systems, windows, doors and skylights.


  • 19
    WHAT IS ASPECT RATIO?

    Aspect ratio, as it relates to shear walls, is the height-to-width ratio of the shear wall segment. Example: An 8-ft tall shear wall that has a width of 4-ft, has a 2:1 aspect ratio.


  • 20
    HOW DOES ZIP SYSTEM R-SHEATHING ADDRESS WIND UPLIFT?

    ZIP System R-Sheathing is not recognized to resist combined uplift and shear. The requirement of any additional hold-down connectors or straps shall be determined by the designer-of-record, local building codes or other authority having jurisdiction. See the ZIP System R-Sheathing Installation Manual for more information.


  • 21
    WILL THE FOAM ABSORB WATER?

    The closed-cell structure of the polyisocyanurate foam impedes absorption of the water. The foam has a water absorption of <1% by volume when measured by ASTM C 209 and it can be considered a low-absorbant material..


  • 22
    WHAT IS A SHEARWALL? WHAT IS A BRACED WALL? WHAT IS THE DIFFERENCE ?

    Braced Wall provisions are prescriptive or “cook book” and are used in conventional construction. There is essentially no “engineering” required because the bracing requirements are spelled out in the code. For structures that do not meet conventional construction parameters, an engineered shear wall design is required by an engineer or other design professional based on calculations and engineering analysis. The code spells out braced wall requirements. A design professional spells out shear wall requirements. Both serve the same purpose which is to safely resist any anticipated wind or seismic event.


  • 23
    HOW HIGH CAN THE R-SHEATHING UNIT BE STACKED?

    Do not stack more than three units high.


  • 24
    IS THERE AN ISSUE WITH FLAME SPREAD AND SMOKE DEVELOPED INFORMATION SPECIFIC TO THE FOAM?

    No, both the IRC and IBC require that the surface burning characteristics of all foam plastic insulations be tested and exhibit a flamespread index of not more than 75 and a smoke development index of not more than 450. The foam insulation layer on R-Sheathing satisfies this requirement when measured by ASTM E 84 in accordance with the Acceptance Criteria for Foam Plastic Insulation (AC 12).


  • 25
    WHAT IS THE SIGNIFICANCE OF THE UL MARK?

    The UL mark is evidence that the product has been evaluated with respect to specific properties or for suitablility for use under certain specified conditions. The mark is also evidence that Huber has demonstrated ability to manufacture the product complying with UL requirements. In addition the mark provides evidence that the product is covered by a UL follow-up service to verify the product continues to be manufactured in the same manner that was evaluated and approved.


  • 26
    CAN ZIP SYSTEM R-SHEATHING BE USED IN FIRE-RATED ASSEMBLIES?

    Yes. ZIP System R-Sheathing is recognized in UL Design No. V302 and V303. It may not be used as a substitute for conventional wood structural panels in fire-rated wall assemblies specifying “wood structural panels.”


  • 27
    WHAT IS AN ACCEPTANCE CRITERIA?

    Acceptance Criteria (AC) is a list of standardized tests that a product or system must pass before ICC-ES will issue an ESR.


  • 28
    What is Type V?

    Type V construction is the type of construction in which the structural elements, exterior walls and interior walls can be any type of material permitted by the code. Type V is the only type that allows exterior walls to be built with combustible material which includes wood. Construction Types I, II, III, IV and V pertain to commercial construction and do not apply to the IRC.