UNDER-SLAB VAPOR RETARDER
PART 1 - GENERAL
1.1 SUMMARY
A. Productssupplied under this section:
1. Vapor retarder and installationaccessories for installation under concrete slabs.
B. Relatedsections:
1. Section 03 30 00 Cast-in-Place Concrete
2. Section 07 26 00 Vapor Retarders
1.2 REFERENCES
A. AmericanSociety for Testing and Materials (ASTM):
1. ASTM E1745-17 Standard Specificationfor Plastic Water Vapor Retarders Used in Contact with Soil or Granular FillUnder Concrete Slabs.
2. ASTM E1643-11 Selection, Design,Installation, and Inspection of Water Vapor Retarders Used in Contact withEarth or Granular Fill Under Concrete Slabs.
B. TechnicalReference - American Concrete Institute (ACI):
1. ACI 302.2R-06 Guide for ConcreteSlabs that Receive Moisture-Sensitive Flooring Materials.
2. ACI 302.1R-15 Guide to Concrete Floorand Slab Construction.
1.3 SUBMITTALS
A. Qualitycontrol/assurance:
1. Summary of test results per paragraph9.3 of ASTM E1745.
2. Manufacturer's samples andliterature.
3. Manufacturer's installationinstructions for placement, seaming, penetration prevention and repair, andperimeter seal per ASTM E1643.
4. All mandatory ASTM E1745 testing mustbe performed on a single production roll per ASTM E1745 Section 8.1.
PART 2 - PRODUCTS
2.1 MATERIALS
A. Vapor retarder shall have all of thefollowing qualities:
1. Maintain permeance of less than 0.01Perms [grains/(ft2 · hr · inHg)] as tested in accordance with mandatory conditioningtests per ASTM E1745 Section 7.1 (7.1.1-7.1.5).
2. Other performance criteria:
a. Strength: ASTM E1745 Class A.
b. Thickness: 10 mils minimum
3. Provide third party documentationthat all testing was performed on a single production roll per ASTM E1745Section 8.1
B. Vapor retarder products:
1. Basis of Design: Stego Wrap Class A Vapor Retarder by Stego Industries LLC., (877) 464-7834 www.stegoindustries.com.
2. No substitutions.
2.2 ACCESSORIES
A. Seams:
1. Stego Tape by Stego Industries LLC,(877) 464-7834 www.stegoindustries.com.
B. SealingPenetrations of Vapor Retarder:
1. Stego Mastic by Stego Industries LLC,(877) 464-7834 www.stegoindustries.com.
2. StegoTape by Stego Industries LLC, (877) 464-7834 www.stegoindustries.com.
C. Perimeter/edgeseal:
1. Stego Crete Claw by Stego IndustriesLLC, (877) 464-7834 www.stegoindustries.com.
2. StegoTerm Bar by Stego Industries LLC, (877) 464-7834 www.stegoindustries.com.
3. StegoTackTape (double-sided sealant tape) by Stego Industries LLC, (877) 464-7834www.stegoindustries.com.
D. PenetrationPrevention:
1. Beast Foot by Stego Industries LLC, (877) 464-7834 www.stegoindustries.com.
E. VaporBarrier-Safe Screed System
1. Beast Screed by Stego Industries, LLC, (877) 464-7834www.stegoindustries.com.
PART 3 - EXECUTION
3.1 PREPARATION
A. Ensurethat subsoil is approved by Architect or Geotechnical Engineer.
1. Level and compact base material.
3.2 INSTALLATION
A. Installvapor barrier in accordance ASTM E1643.
1. Unroll vapor retarder with the longestdimension parallel with the direction of the concrete placement and face lapsaway from the expected direction of the placement whenever possible.
2. Extend vapor retarder to the perimeterof the slab. If practicable, terminate it at the top of the slab, otherwise (a)at a point acceptable to the structural engineer or (b) where obstructed byimpediments, such as dowels, waterstops, or any other site condition requiringearly termination of the vapor barrier. At the point of termination, seal vaporretarder to the foundation wall, grade beam or slab itself.
[Specifiernote: The perimeter seal can be handled several ways. When sealing to the slab,
Crete Claw is the best option. When sealing to a stem wall or wall,
the best option is to use StegoTack Tape orboth StegoTack Tape and Stego Term Bar.]
a. Seal vapor retarder to the entire slabperimeter using Stego Crete Claw, per manufacturer's instructions.
OR
b. Seal vapor retarder to the entireperimeter wall or footing/grade beam with double sided StegoTack Tape, or bothStego Term Bar and StegoTack Tape, per manufacturer's instructions. Ensure the concrete is clean and dry prior toadhering tape.
3. Overlap joints 6 inches and seal withmanufacturer's seam tape.
4. Apply seam tape/Crete Claw to a cleanand dry vapor retarder.
5. Seal all penetrations (includingpipes) per manufacturer's instructions.
6. For interior forming applications,avoid the use of non-permanent stakes driven through vapor barrier. Use blunt-end and/or threaded nail stakes(screed pad posts) and insert them into Beast Foot. Ensure Beast Foot'speel-and-stick adhesive base is fully adhered to the vapor retarder.
7. If non-permanent stakes must bedriven through vapor retarder, repair as recommended by vapor retardermanufacturer.
8. Use reinforcing bar supports withbase sections that eliminate or minimize the potential for puncture of thevapor retarder.
9. Repair damaged areas with vaporretarder material of similar (or better) permeance, puncture and tensile.
10. For vapor barrier-safe concrete screedingapplications, install Beast Screed (vapor barrier-safe screed system) permanufacturer's instructions prior to placing concrete.
END OF SECTION
