HomeMy WebLinkAbout07 25 10 - Weather Barriers TyvekMidtown West Studio M Architecture and Planning
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07 25 10 - 1
SECTION 07 25 10 – WEATHER BARRIERS TYVEK
PART 1 - GENERAL
1.1 SECTION INCLUDES
A. Weather barrier membrane (DuPont™ Tyvek® CommercialWrap®)
B. Seam Tape (DuPont™ Tyvek® Tape)
C. Flashing (DuPont™ FlexWrap™, DuPont™ FlexWrap™ NF, DuPont™
StraightFlash™, DuPont™ StraightFlash™ VF, and/or DuPont™ Thru-Wall
Flashing)
D. Fasteners (DuPont™ Tyvek® Wrap Caps)
1.2 REFERENCES
A. ASTM International
1. ASTM C920; Standard Specification for Elastomeric Joint Sealants
2. ASTM C1193; Standard Guide for Use of Joint Sealants
3. ASTM D882; Test Method for Tensile Properties of Thin Plastic
Sheeting
4. ASTM D1117; Standard Guide for Evaluating Non-woven Fabrics
5. ASTM E84; Test Method for Surface Burning Characteristics of
Building Materials
6. ASTM E96; Test Method for Water Vapor Transmission of Materials
7. ASTM E1677; Specification for Air Retarder Material or System for
Framed Building Walls
8. ASTM E2178; Test Method for Air Permeance of Building Materials
9. ASTM E2357; Standard Test Method for Determining Air Leakage of
Air Barrier Assemblies
B. AATCC – American Association of Textile Chemists and Colorists
1. Test Method 127 Water Resistance: Hydrostatic Pressure Test
C. TAPPI
1. Test Method T-410; Grams of Paper and Paperboard (Weight per Unit
Area)
2. Test Method T-460; Air Resistance (Gurley Hill Method)
1.3 SUBMITTAL PROCEDURES
A. Product Data: Submit manufacturer current technical literature for each
component.
B. Samples: Weather Barrier Membrane, minimum 8-1/2 inches by 11 inch.
C. Quality Assurance Submittals
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Carmel, IN November 10, 2017 (ASI-002, 02.05.2018)
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1. Design Data, Test Reports: Provide manufacturer test reports
indicating product compliance with indicated requirements.
2. Manufacturer Instructions: Provide manufacturer’s written installation
instructions.
3. Manufacturer’s Field Service Reports: Provide site reports from
authorized field service representative, indicating observation of
weather barrier assembly installation.
D. Closeout Submittals
1. Weather Barrier Warranty: Manufacturer’s executed warranty form with
authorized signatures and endorsements indicating date of Substantial
Completion.
1.4 QUALITY ASSURANCE
A. Qualifications
1. Installer shall have experience with installation of commercial weather
barrier assemblies under similar conditions.
2. Installation shall be in accordance with weather barrier manufacturer’s
installation guidelines and recommendations.
3. Source Limitations: Provide commercial weather barrier and
accessory materials produced by single manufacturer.
B. Mock-up
1. Install mock-up using approved weather barrier assembly including
fasteners, flashing, tape and related accessories per manufacturer’s
current printed instructions and recommendations.
a. Mock-up size: [10 feet by 10 feet] [insert size].
b. Mock-up Substrate: Match wall assembly construction, including
window opening.
c. Mock-up may remain as part of the work.
2. Contact manufacturer’s designated representative prior to weather
barrier assembly installation, to perform required mock-up visual
inspection and analysis as required for warranty.
C. Pre-installation Meeting
1. Hold a pre-installation conference, two weeks prior to start of
weather barrier installation. Attendees shall include Contractor,
Architect, Engineer, Installer, Owner’s Representative, and Weather
Barrier Manufacturer’s Designated Representative.
2. Review all related project requirements and submittals, status of
substrate work and preparation, areas of potential conflict and
interface, availability of weather barrier assembly materials and
components, installer’s training requirements, equipment, facilities and
scaffolding, and coordinate methods, procedures and sequencing
requirements for full and proper installation, integration and
protection.
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Carmel, IN November 10, 2017 (ASI-002, 02.05.2018)
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1.5 DELIVERY, STORAGE & HANDLING
A. Deliver weather barrier materials and components in manufacturer’s original,
unopened, undamaged containers with identification labels intact.
B. Store weather barrier materials as recommended by weather barrier
manufacturer.
1.6 SCHEDULING
A. Review requirements for sequencing of installation of weather barrier
assembly with installation of windows, doors, louvers and flashings to
provide a weather-tight barrier assembly.
B. Schedule installation of weather barrier materials and exterior cladding
within nine months of weather barrier assembly installation.
1.7 WARRANTY
A. Warranty:
1. Special weather-barrier manufacturer’s warranty for weather barrier for
a period of ten (10) years from date of purchase.
2. Pre-installation meetings and jobsite observations by weather barrier
manufacturer for warranty are required.
PART 2 PRODUCTS
2.1 MANUFACTURER
A. DuPont; 4417 Lancaster Pike, Chestnut Run Plaza 728, Wilmington, DE
19805; 1-800-44-TYVEK (8-9835); http://www.construction.tyvek.com
2.2 MATERIALS
A. Basis of Design: spunbonded polyolefin, non-woven, non-perforated,
weather barrier is based upon DuPont™ Tyvek® CommercialWrap® and
related assembly components.
B. Performance Characteristics:
1. Air Penetration: 0.001 cfm/ft2 at 75 Pa, when tested in accordance
with ASTM E2178. Type I per ASTM E1677. ≤0.04 cfm/ft2 at 75 Pa,
when tested in accordance with ASTM E2357
2. Water Vapor Transmission: 28 perms, when tested in accordance with
ASTM E96, Method B.
3. Water Penetration Resistance: 280 cm when tested in accordance with
AATCC Test Method 127.
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Carmel, IN November 10, 2017 (ASI-002, 02.05.2018)
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4. Basis Weight: 2.7 oz/yd2, when tested in accordance with TAPPI Test
Method T-410.
5. Air Resistance: Air infiltration at >1500 seconds, when tested in
accordance with TAPPI Test Method T-460.
6. Tensile Strength: 38/35 lbs/in., when tested in accordance with ASTM
D882, Method A.
7. Tear Resistance: 12/10 lbs., when tested in accordance with ASTM
D1117.
8. Surface Burning Characteristics: Class A, when tested in accordance
with ASTM E 84. Flame Spread: 10, Smoke Developed: 10
2.3 ACCESSORIES
A. Seam Tape: 3 inch wide, DuPont™ Tyvek® Tape for commercial applications.
B. Fasteners:
1. DuPont™ Tyvek® Wrap Cap Screws, as distributed by DuPont: 1-5/8 inch
rust resistant screw with 2-inch diameter plastic cap or manufacturer
approved 1-1/4” or 2” metal gasketed washer
2. Tyvek® Wrap Caps, as distributed by DuPont: #4 nails with large 1-inch
plastic cap fasteners, or 1-inch plastic cap staples with leg length
sufficient to achieve a minimum penetration of 5/8-inch into the wood
stud.
C. Sealants
1. Provide sealants that comply with ASTM C920, elastomeric polymer
sealant to maintain watertight conditions.
2. Products:
a. DuPont™ Commercial Sealant
c. DuPont™ Residential Sealant
b. Sealants recommended by the weather barrier manufacturer.
D. Adhesives:
1. Provide adhesive recommended by weather barrier manufacturer.
2. Products:
a. Liquid Nails® LN-109
b. Denso Butyl Liquid
c. 3M High Strength 90
d. SIA 655
e. Adhesives recommend by the weather barrier manufacturer.
E. Primers:
1. Provide flashing manufacturer recommended primer to assist in
adhesion between substrate and flashing.
2. Products:
a. 3M High Strength 90
b. Denso Butyl Spray
c. SIA 655
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Carmel, IN November 10, 2017 (ASI-002, 02.05.2018)
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d. Permagrip 105
e. ITW TACC Sta’ Put SPH
f. Primers recommended by the flashing manufacturer
F. Flashing – Basis of Design Products ( Refer to 07.60.00 for Alternative
Approved Flashing Systems)
1. DuPont™ FlexWrap™, as distributed by DuPont: flexible membrane
flashing materials for window openings and penetrations.
2. DuPont™ FlexWrap™ NF, as distributed by DuPont: flexible membrane
flashing materials for window openings and penetrations.
3. DuPont™ StraightFlash™, as distributed by DuPont: straight flashing
membrane materials for flashing windows and doors and sealing
penetrations such as masonry ties, etc.
4. DuPont™ StraightFlash™ VF, as distributed by DuPont: dual-sided
straight flashing membrane materials for brick mold and non-flanged
windows and doors.
5. DuPont™ Thru-Wall Surface Adhered Membrane with Integrated Drip
Edge: Thru-Wall flashing membrane materials for flashing at changes in
direction or elevation (shelf angles, foundations, etc.) and at transitions
between different assembly materials.
6. Preformed Inside and Outside Corners and End Dams as distributed by
DuPont: Preformed three-dimensional shapes to complete the flashing
system used in conjunction with DuPont™ Thru-Wall Flashing.
PART 3 - EXECUTION
3.1 EXAMINATION
A. Verify substrate and surface conditions are in accordance with weather
barrier manufacturer recommended tolerances prior to installation of
weather barrier and accessories
3.2 INSTALLATION – WEATHER BARRIER
A. Install weather barrier over exterior face of exterior wall substrate in
accordance with manufacturer recommendations.
B. Install weather barrier prior to installation of windows and doors.
C. Start weather barrier installation at a building corner, leaving 6-12 inches of
weather barrier extended beyond corner to overlap.
D. Install weather barrier in a horizontal manner starting at the lower portion
of the wall surface with subsequent layers installed in a shingling manner to
overlap lower layers. Maintain weather barrier plumb and level.
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E. Sill Plate Interface: Extend lower edge of weather barrier over sill plate
interface 3-6 inches. Secure to foundation with elastomeric sealant as
recommended by weather barrier manufacturer.
F. Window and Door Openings: Extend weather barrier completely over
openings.
G. Overlap weather barrier:
1. Exterior corners: minimum 12 inches.
2. Seams: minimum 6 inches.
H. Weather Barrier Attachment:
1. Attach weather barrier to studs through exterior sheathing. Secure
using weather barrier manufacturer recommended fasteners, space 12
-18 inches vertically on center along stud line, and 24 inch on center,
maximum horizontally.
I. Apply 4 inch by 7 inch piece of DuPont™ StraightFlash™ or weather barrier
manufacturer approved alternate to weather barrier membrane prior to the
installation cladding anchors.
3.3 SEAMING
A. Seal seams of weather barrier with seam tape at all vertical and horizontal
overlapping seams.
B. Seal any tears or cuts as recommended by weather barrier manufacturer.
3.4. OPENING PREPARATION (for use with non-flanged windows – all cladding types)
A. Flush cut weather barrier at edge of sheathing around full perimeter of
opening.
B. Cut a head flap at 45-degree angle in the weather barrier at window head to
expose 8 inches of sheathing. Temporarily secure weather barrier flap away
from sheathing with tape.
3.5 FLASHING (for use with non-flanged windows – all cladding types)
A. Cut 9-inch wide DuPont™ FlexWrap™ or DuPont™ FlexWrap™ NF a minimum of
12 inches longer than width of sill rough opening. Apply primer as required
by manufacturer.
B. Cover horizontal sill by aligning DuPont™ FlexWrap™ edge with inside edge
of sill. Adhere to rough opening across sill and up jambs a minimum of 6
inches. Secure flashing tightly into corners by working in along the sill
before adhering up the jambs.
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Carmel, IN November 10, 2017 (ASI-002, 02.05.2018)
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C. Fan DuPont™ FlexWrap™ at bottom corners onto face of wall. Firmly press in
place. Mechanically fasten fanned edges. Mechanical fastening is not
required for DuPont™ FlexWrap™ NF.
D. Apply 9-inch wide strips of DuPont™ StraightFlash™ at jambs. Align flashing
with interior edge of jamb framing. Start DuPont™ StraightFlash™ at head of
opening and lap sill flashing down to the sill.
E. Spray-apply primer to top 6 inches of jambs and exposed sheathing.
F. Install DuPont™ FlexWrap™ DuPont™ FlexWrap™ NF at opening head using
same installation procedures used at sill. Overlap jamb flashing a minimum of
2 inches.
G. Coordinate flashing with window installation.
H. On exterior, install backer-rod in joint between window frame and flashed
rough framing. Apply sealant at jambs and head, leaving sill unsealed. Apply
sealants in accordance with sealant manufacturer’s instructions and ASTM C
1193.
I. Position weather barrier head flap across head flashing. Adhere using 4-
inch wide DuPont™ StraightFlash™ over the 45-degree seams.
J. Tape top of window in accordance with manufacturer recommendations.
K. On interior, install backer rod in joint between frame of window and flashed
rough framing. Apply sealant around entire window to create air seal. Apply
sealant in accordance with sealant manufacturer’s instructions and ASTM C
1193.
3.6 OPENING PREPARATION:
A. Cut weather barrier in an “ -cut” pattern. A modified -cut is also
acceptable.
1. Cut weather barrier horizontally along the bottom and top of the
window opening.
2. From the top center of the window opening, cut weather barrier
vertically down to the sill.
B. Fold side and bottom weather barrier flaps into window opening and fasten.
C. Cut a head flap at 45-degree angle in the weather barrier at window head to
expose 8 inches of sheathing. Temporarily secure weather barrier flap away
from sheathing with tape.
Midtown West Studio M Architecture and Planning
Carmel, IN November 10, 2017 (ASI-002, 02.05.2018)
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3.7 FLASHING (for use with flanged windows)
A. Cut [7-inch] [9-inch] wide DuPont™ FlexWrap™ or DuPont™ FlexWrap™ NF a
minimum of 12 inches longer than width of sill rough opening.
B. Cover horizontal sill by aligning DuPont™ FlexWrap™ edge with inside edge
of sill. Adhere to rough opening across sill and up jambs a minimum of 6
inches. Secure flashing tightly into corners by working in along the sill
before adhering up the jambs.
C. Fan DuPont™ FlexWrap™ at bottom corners onto face of wall. Firmly press
in place. Mechanically fasten fanned edges. Mechanical fastening is not
required for DuPont™ FlexWrap™ NF.
D. On exterior, apply continuous bead of sealant to wall or backside of
window mounting flange across jambs and head. Do not apply sealant
across sill.
E. Install window according to manufacturer’s instructions.
F. Apply 4-inch wide strips of DuPont™ StraightFlash™ at jambs overlapping
entire mounting flange. Extend jamb flashing 1-inch above top of rough
opening and below bottom edge of sill flashing.
G. Apply 4-inch wide strip of DuPont™ StraightFlash™ as head flashing
overlapping the mounting flange. Head flashing should extend beyond
outside edges of both jamb flashings.
H. Position weather barrier head flap across head flashing. Adhere using 4-
inch wide DuPont™ StraightFlash™ over the 45-degree seams.
I. Tape head flap in accordance with manufacturer recommendations.
J. On interior, install backer rod in joint between frame of window and
flashed rough framing. Apply sealant around entire window to create air
seal. Apply sealant in accordance with sealant manufacturer’s instructions
and ASTM C 1193.
3.8 THRU-WALL FLASHING INSTALLATION
A. Apply primer per manufacturer’s written instructions.
B. Install preformed corners and end dams bedded in sealant in appropriate
locations along wall.
C. Starting at a corner, remove release sheet and apply membrane to primed
surfaces in lengths of 8 to 10 feet.
D. Extend membrane through wall and leave ¼ inch minimum exposed to form
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drip edge.
E. Roll flashing into place. Ensure continuous and direct contact with
substrate.
F. Lap ends and overlap preformed corners 4 inches minimum. Seal all laps
with sealant.
G. Trim exterior edge of membrane 1-inch and secure metal drip edge per
manufacturer’s written instructions.
H. Terminate membrane on vertical wall. Terminate counterflashing or with
termination bar.
I. Apply sealant bead at each termination.
3.9 THRU-WALL FLASHING/WEATHER BARRIER INTERFACE AT BASE OF WALL
A. Overlap thru-wall flashing with weather barrier by 6-inches.
B. Mechanically fasten bottom of weather barrier through top of thru-wall
flashing.
C. Seal vertical and horizontal seams with tape or sealing membrane.
3.10 THRU-WALL FLASHING/WEATHER BARRIER INTERFACE AT SHELF ANGLE
A. Seal weather barrier to bottom of shelf angle with sealing membrane.
B. Apply thru-wall flashing to top of shelf angle. Overlap thru-wall flashing with
weather barrier by 6-inches.
C. Seal bottom of weather barrier to thru-wall flashing with tape or sealing
membrane.
3.11 THRU-WALL FLASHING/WEATHER BARRIER INTERFACE AT WINDOW HEAD
A. Cut flap in weather barrier at window head.
B. Prime exposed sheathing.
C. Install lintel as required. Verify end dams extend 4 inches minimum beyond
opening.
D. Install end dams bedded in sealant.
E. Adhere 2 inches minimum thru-wall flashing to wall sheathing. Overlap lintel
with thru-wall flashing and extend ¼ inch minimum beyond outside edge of
lintel to form drip edge.
F. Apply sealant along thru-wall flashing edges.
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G. Fold weather barrier flap back into place and tape bottom edge to thru-wall
flashing.
H. Tape diagonal cuts of weather barrier.
I. Secure weather barrier flap with fasteners.
3.12 FIELD QUALITY CONTROL
A. Notify manufacturer’s designated representative to obtain [required]
periodic observations of weather barrier assembly installation.
3.13 PROTECTION
A. Protect installed weather barrier from damage.
END OF SECTION