architect’s guide for detailing & specifying access … · architect’s guide for detailing...
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Architect’s Guide for Detailing &Specifying Access Floor Air Plenums
Access Floorsto the Power of
Access F loors
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“”
Access floor air plenumintegrity begins with proper
design and specification.
“”
Access floor air plenumintegrity begins with proper
design and specification.
Architect’s Guide for Detailing & Specifying Access Floor Air Plenums Plenum Integrity is one of the most important aspects of designing, constructing and maintaining an underfloor air delivery (UFAD) system. It is
vital that the entire design and construction team does their part to ensure the underfloor plenum is sealed properly. This process starts with the
architect. As the architect designing a building with a UFAD system you have the responsibility of providing specifications and details for con-
structing a plenum with proper sealing and integrity. Every contractor working in the plenum space needs to be aware of their responsibilities
and should be equipped with the information they need to successfully complete their work while maintaining plenum integrity.
Tate Access Floors is providing the following plenum seal integrity guidelines for consideration. The recommendations contained within this
guideline are based on lessons learned through working on a wide range of UFAD projects. To that end, Tate believes a holistic approach to
design and construction should be used and recommends regular consultation be held with key individuals on the construction team through-
out the entire design process.
There are six primary recommendations. An overview and explanation of each recommendations is provided below followed by proposed speci-
fication language and construction details.
Design: Specifications and performance requirements that create awareness and responsibility for plenum
sealing integrity should be included in all divisions of the CSI specifications. Drawings detailing the
construction requirements for the underfloor air delivery plenum should also be provided.
Pre-Bid Meeting: The requirement for pre-bid meetings to inform all subcontractors of the plenum sealing and
mock-up construction requirements should be specified.
Pre-Construction: Pre-construction meetings should also be specified to reaffirm the plenum sealing requirements to
each sub-contractor division.
Mock-up: Specify the construction and testing of a mock-up that includes all actual building conditions relative
to the UFAD system.
Quality Inspections: Specify the use of a commissioning agent to audit the construction process, perform air leakage
testing on the mock-up and final installation, and provide detailed reporting to the GC that ensures
the construction of the UFAD system follows the specified requirements.
Downloadable Specifications & DetailsVisit Tate’s website to download the sealing details and recommended specification language in this guide. The details are available in AutoCAD
dwg and PDF file formats. In addition a Microsoft word version of the specifications in this guide can be found in the architectural details under
the Product & Spec section of the website or by entering the following address into a web browser:
www.tateaccessfloors.com/architectural_details.html
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CSI Specifications for ConsiderationThe following is Tate’s recommended access floor air plenum sealing specification language to insert into the CSI specifications for subcontrac-
tors. All of the specifications can be downloaded on-line at www.tateaccessfloors.com/architectural_details.html
DIVISION 01 - GENERAL REQUIREMENT SPECIFICATIONS
Pre-Bid & Pre-Construction Meetings: All sub-contractors intending to bid on or awarded work on the project are required to attend pre-bid
and pre-construction meetings respectively. The purpose of these meetings is to review all air plenum specifications and details including but not
limited to pre-construction mock-ups and plenum sealing requirements.
Quality Control: All walls passing through the access floor must have gypsum board extending completely to the slab and be sealed at the
slab line. All penetrations into cavity walls and slabs for air ducts, plumbing pipes, electrical conduit and voice/data cabling must be completely
sealed. All seams and/or holes that have been created for or resulting from the work performed by a specific trade should be properly sealed by
that trade and whenever possible performed prior to the installation of the access floor.
Quality Control: Special inspections must be conducted by an independent quality auditor or commissioning agent to ensure that plenum
sealing work is performed by all subcontractors in compliance with specifications and drawings. Inspections shall occur as work progresses
and whenever possible in the presence of a representative from the general contractor. Reports of inspections will be submitted to the general
contractor.
Plenum Mock-Up & Testing: All subcontractors responsible for constructing or penetrating the underfloor plenum must participate in the
construction of an on-site plenum mockup consisting of all planned plenum components, penetrations, seams and openings. The mock-up
plenum is to be inspected and tested by an independent commissioning agent for air leakage to verify that it was constructed and sealed in
accordance with specifications and drawings including meeting the air leakage requirements.
Building Plenum Inspections and Tests: The constructed plenum is to be inspected and tested by an independent commissioning agent for
air leakage to verify that it was constructed and sealed in accordance with specifications and drawings including meeting the air leakage
requirements.
Air Leakage Requirements: Total air leakage from the plenum should be no more than 15% of the design airflow for category 1 leakage, and
15% of the design airflow for category 2 leakage when tested at the typical static pressure range of .05 -.10” w.g. max.
(Note:There are two basic categories of UFAD air leakage. Category 1 leakage occurs outside of the intended occupied zone. Category 2 leak-
age is plenum air that leaks into the occupied zone through spaces other than the designed air distribution devices such as diffusers. Category
2 leakage is unique to UFAD systems because all of this leakage goes into the occupied space whereas in a traditional ducted overhead sys-
tem, all leakage and short-circuited air enters the return plenum and will not reach the intended zone.)
DIVISION 03 - CONCRETE SPECIFICATION - Cast in Place Concrete
The concrete contractor is aware that the space beneath the access floor will be used as an air delivery plenum and as such will take the nec-
essary precautions when installing their work so as not to impact the integrity of the plenum space specific to air leakage and cleanliness. Any
penetrations or holes in the underfloor plenum resulting from the work performed by the division 3 contractors not intended for service utility
distribution are required to be properly sealed to prevent air leakage.
DIVISION 05 - METAL STAIRS SPECIFICATION
The metal stair contractor is aware that the space beneath the access floor will be used as an air delivery plenum and as such will take the nec-
essary precautions when installing their work so as not to impact the integrity of the plenum space specific to air leakage and cleanliness. Any
penetrations or holes in the underfloor plenum created for or resulting from the work performed by the division 5 contractors are required to be
properly sealed to prevent air leakage.
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DIVISION 09 - FINISHES (WALLS) SPECIFICATION
The wall contractor is aware that the space beneath the access floor will be used as an air delivery plenum and as such will take the necessary
precautions when installing their work so as not to impact the integrity of the plenum space specific to air leakage and cleanliness. Any penetra-
tions or holes in the underfloor plenum created for or resulting from the work performed by the wall contractors are required to be properly
sealed to prevent air leakage.
DIVISION 09 - FINISHES (ACCESS FLOORING) SPECIFICATION
The access floor contractor is aware that the space beneath the access floor will be used as an air delivery plenum and as such will take the
necessary precautions when installing their work so as not to impact the integrity of the plenum space specific to air leakage and cleanliness.
Any penetrations or holes in the underfloor plenum created for or resulting from the work performed by the access flooring contractors are
required to be properly sealed to prevent air leakage.
DIVISION 09 - FINISHES (TILE CARPETING) SPECIFICATION
The carpeting contractor is aware that the space beneath the access floor will be used as an air delivery plenum and as such will take the nec-
essary precautions when installing their work so as not to impact the integrity of the plenum space specific to air leakage and cleanliness. Any
penetrations or holes in the underfloor plenum created for or resulting from the work performed by the carpeting contractors are required to be
properly sealed to prevent air leakage.
DIVISION 14 - CONVEYING EQUIPMENT SPECIFICATION
The conveying equipment contractor is aware that the space beneath the access floor will be used as an air delivery plenum and as such will
take the necessary precautions when installing their work so as not to impact the integrity of the plenum space specific to air leakage and
cleanliness. Any penetrations or holes in the underfloor plenum created for or resulting from the work performed by the division 14 contractors
are required to be properly sealed to prevent air leakage.
DIVISION 22 - PLUMBING SPECIFICATION
The plumbing contractor is aware that the space beneath the access floor will be used as an air delivery plenum and as such will take the nec-
essary precautions when installing their work so as not to impact the integrity of the plenum space specific to air leakage and cleanliness. Any
penetrations or holes in the underfloor plenum created for or resulting from the work performed by the division 22 plumbing contractors are
required to be properly sealed to prevent air leakage.
DIVISION 23 - HEATING VENTILATION AND AIR CONDITIONING SPECIFICATION
The HVAC contractor is aware that the space beneath the access floor will be used as an air delivery plenum and as such will take the neces-
sary precautions when installing their work so as not to impact the integrity of the plenum space specific to air leakage and cleanliness. Any
penetrations or holes in the underfloor plenum created for or resulting from the work performed by the division 23 HVAC contractors are
required to be properly sealed to prevent air leakage.
DIVISION 26 - ELECTRICAL SPECIFICATION
The electrical contractor is aware that the space beneath the access floor will be used as an air delivery plenum and as such will take the nec-
essary precautions when installing their work so as not to impact the integrity of the plenum space specific to air leakage and cleanliness. Any
penetrations or holes in the underfloor plenum created for or resulting from the work performed by the division 26 electrical contractors are
required to be properly sealed to prevent air leakage.
DIVISION 27 - COMMUNICATIONS SPECIFICATION
The communications contractor is aware that the space beneath the access floor will be used as an air delivery plenum and as such will take
the necessary precautions when installing their work so as not to impact the integrity of the plenum space specific to air leakage and cleanli-
ness. Any penetrations or holes in the underfloor plenum created for or resulting from the work performed by the division
26 communications contractors are required to be properly sealed to prevent air leakage.
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CURTAIN WALL
CONCRETE DECK
SEAL AT SLAB LINE
INTERIOR WALL ASSEMBLY
Base Building Core & Shell Sealing DetailsA) PERIMETER SEAM ALONG SLAB AND EXTERIOR WALL
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Construction Details for ConsiderationThe following are typical sealing details that should be considered to ensure UFAD plenum integrity. All of the details can be downloaded on-line
at: www.tateaccessfloors.com/ architectural_details.html
Underfloor Air Sealing LocationsPLAN VIEW WITHOUT ACCESS FLOOR
MECHANICAL
KITCHEN
JANITORMENS
WOMENS
ELECTRICALTELCOM
ELECTRICAL TELCOM
DETAIL A
DETAIL B
DETAIL N
DETAIL E
DETAIL D DETAIL F
DETAIL I & K
DETAIL G
DETAIL L & M
DETAIL CKITCHEN
MENS
WOMENS
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CONCRETE DECK
SEAL AT SLAB LINE
SCHEDULED GWB
C) DRYWALL PARTITION CONDITION
STRUCTURAL COLUMN WALL ASSEMBLY (TYP)
CONCRETE DECK
SEAL AT SLAB LINE
B) ENCLOSED COLUMN SEAM AT SLAB LINE
STAIR TREAD (TYP)
SEAL AT SLAB LINE
SEAL SEAM BETWEEN STAIRAND CURB OR OTHER SUPPORT
CONCRETE CURB OR STRUCTURALSTEEL WITH FULL ENCLOSURE
CONCRETE DECK
D) BASE OF STAIRS ON BUILDING SLAB
CONCRETE DECKSEAL JOINT
EXPANSION JOINT
G) EXPANSION JOINT IN CONCRETE DECK
SEAL AT SLAB LINE
CONCRETE DECK
STAIR TREAD (TYP)
TOP OF STAIR INTERFACE WITH CONCRETE DECK
CONCRETE CURB OR STRUCTURALSTEEL WITH FULL ENCLOSURE
E) TOP OF STAIR INTERFACE WITH CONCRETE DECK
SEAL AROUND FULL ENCLOSURE
ELEVATOR THRESHOLD
ELEVATOR DOORS
CONCRETE DECKCONCRETE CURB OR STRUCTURALSTEEL WITH FULL ENCLOSURE
F) ELEVATOR SHAFT BELOW ACCESS FLOOR LINE
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CONCRETE DECK SEAL SPACE AROUND DUCTDUCT
THROUGHWALL
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VERTICAL DUCT
SEAL SPACE AROUND DUCT
CONCRETE DECK
HVAC System Sealing DetailsH) OPENING IN SLAB FOR VERTICAL DUCTS
I) OPENING IN PLENUM WALLS FOR DUCTS
CONCRETE DECK
WALL ASSEMBLY
CONDUIT (ANDCABLE BUNDLE) O.D.
SEAL AROUND CONDUIT
CONDUIT
Electrical System Sealing Detailsl) CONDUIT THROUGH PLENUM WALLS
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CONCRETE DECK
SEAL AROUND PIPE
SEAL AROUND PIPEPIPE O.D.
WALL ASSEMBLY
CONCRETE DECK
Plumbing Sealing DetailsJ) PIPE PENETRATION THROUGH CONCRETE DECK
K) PIPE PENETRATION THROUGH PLENUM WALLS
CONCRETE DECK
WALL ASSEMBLY
CABLE BUNDLE
CAPPED ENDS OF UNUSED CABLE SLEEVE (TYP)
SEAL AROUND CABLE SLEEVE CABLE SLEEVE O.D.
SEAL AROUND CABLES INSIDE SLEEVE
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OUTLET
CONDUIT
CONDUIT
WALL ASSEMBLY
WALL ASSEMBLY
CONCRETE DECK
CONCRETE DECK
SEAL OPENING AT CONDUIT PENETRATION
SEAL OPENING AT CONDUIT PENETRATION
SEAL OPEN END OF CONDUIT IN PLENUM
SEAL OPEN END OF CONDUIT IN PLENUM
THERMOSTAT
M) OPEN ENDS OF CONDUIT IN THE PLENUM SPACE
Voice/Data System Sealing DetailsN) CABLE PENETRATIONS THROUGH PLENUM WALL WITH CABLE SLEEVE
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8’ LONG GALVANIZED STEEL HAT CHANNEL
26 GA. X 6’ STEEL BOTTOM ANGLE CUT AS REQUIRED SO THAT IT DOES NOT EXTEND ABOVE HAT CHANNEL
TAPE JOINTS WITH METAL FOIL TAPE
ACCESS FLOOR PANEL
FIELD APPLIED GASKET
FASTEN WITH TEK SCREWS
PANEL FASTENED TO PEDESTAL HEAD WITH COMBO CORNERLOCK SCREW
ATTACH PLENUM CHANNELWITH STRINGER SCREWS
TAPE JOINTS WITH METAL FOILTAPE WHERE BOTTOM ANGLE SECTIONS MEET AND WHERE HAT CHANNEL SECTIONS MEET
TAPE JOINTS WITH METAL FOILTAPE WHERE HAT CHANNELAND BOTTOM ANGLE MEET
BOTTOM ANGLE SET IN FIELD APPLIED CONTINUOUS ADHESIVE BEAD
FIELD APPLIED TATE PLENUM GASKET P/N 10626
Access Floor Sealing Details1) PLENUM DIVIDERS
Access Floor Air Sealing LocationsPLAN VIEW WITH ACCESS FLOOR INSTALLED
MECHANICAL
KITCHEN
JANITORMENS
WOMENS
ELECTRICALTELCOM
ELECTRICAL TELCOM
DETAIL 6 & 7DETAIL 2
DETAIL 14
DETAIL 13DETAIL 4 & 5
6” RAISED PODIUMDETAIL 8
DETAIL 9 & 10
DETAIL 12DETAIL 1 & 3
KITCHEN
MENS
WOMENS
METAL FOIL TAPE AT JOINTS
PLENUM DIVIDER ASSEMBLY
SEAL TO FILL GAP (TYP)
WATER PIPE(S)
CONDUIT
CABLE SLEEVE(FIRESTOP OR PUTTY INSIDE OF SLEEVE)
SEAL AT SLAB LINE
WALL EXTENDS TO SUBFLOOR
SEAL AT FLOOR/WALL LINE
CUT PANELS TOWITHIN 1/16" OF WALL
ACCESS FLOOR PANEL
3) PENETRATIONS THROUGH PLENUM DIVIDERS
4) PERIMETER SEAM WITHOUT WALL BASE
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2) AIR HIGHWAYS
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6) PERIMETER SEAM AT NON-SMOOTH WALLS & COLUMNS
7) ACCESS FLOOR SEAL AT FASCIA / EXPOSED EDGE
NON-SMOOTH WALL OR COLUMN
CAULK & FASTEN METAL ANGLE TO WALL
CUT CARPET TO WALL AND ADD OPTIONAL WALL BASE
CONCORE OR ALL STEEL FLOOR PANEL
GUARDRAIL POST
ATTACH TRIM ANGLE OVER CARPET AND FASCIA PLATECUT CARPET TO FASCIA PLACE AND ADHERETO ACCESS FLOOR WITH RELEASABLE ADHESIVE
ACCESS FLOOR PANELFASCIA PLATE (cut to meetedge of access floor)
BOTTOM ANGLE
WHERE GAPS OCCUR BETWEEN THEEDGE OF THE ACCESS FLOOR AND FASCIA,
APPLY DUCT OR METAL TAPE TO SEAL JOINT
TRIM ANGLE
FIRE RATED CAULK OR SEALANT
PRIOR TO APPLICATION OF CARPET.
SEAL AT SLAB LINE
WALL EXTENDS TO SUBFLOOR
WALL BASE (WHERE USED)
CUT PANELS TOWITHIN 1/16" OF WALL
ACCESS FLOOR PANEL
CUT CARPET TO WALL ANDADHERE TO ACCESS FLOOR
WITH RELEASABLE ADHESIVE
5) PERIMETER SEAM WITH WALL BASE
CONCRETE DECK
STAIR TREAD (TYP)
CONCRETE CURB OR STRUCTURALSTEEL WITH FULL ENCLOSURE
SEAL SEAM AROUND ENCLOSURE
CUT PANEL TO WITHIN1/16" OF STAIR
STAIR TREAD (TYP)
CONCRETE CURB OR STRUCTURALSTEEL WITH FULL ENCLOSURE
SEAL AROUND ENCLOSURE
CUT PANELS TO WITHIN 1/16" OF CURB
9) PERIMETER SEAM AT TOP OF STAIR LANDING
10) PERIMETER SEAM AT BASE OF STAIR LANDING
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8) ACCESS FLOOR SEAL AT FASCIA / EXPOSED EDGE
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13) PERIMETER SEAM AT CURB WHERE FLOOR COVERING IS CONTINUOUS
12) PERIMETER SEAM AT FIRE BARRIER BELOW DOOR THRESHOLD
SHEETROCK FACED FIRE BARRIER SEAL AT SLAB LINE
CONCORE OR ALL STEEL ACCESS FLOOR PANEL
OPTION 1: ATTACH THRESHOLD WITH GASKET ON UNDERSIDE OPTION 2: APPLY SEALANT OR ATTACH
GASKET TO BARRIER TO SEAL JOINTS
PERIMETER PEDESTAL SUPPORT
CARPET TILE ADHERED TO ACCESS FLOOR AND CURB
ACCESS FLOOR PANEL
FOAM GASKET ATTACHEDTO CURB TO SEAL JOINT
CUT PANELS TO WITHIN 1/16" OF WALL.
11) PENETRATION IN WALL THROUGH ACCESS FLOOR
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CONCRETE DECK
SEAL AROUND PIPE
15) CABLE CUTOUTS & GROMMETS
16) POWER, VOICE/DATA DISTRIBUTION BOXES IN ACCESS FLOOR PANELS
17) PIPE PENETRATION THROUGH ACCESS FLOOR
SECTION THROUGH CUTOUT
PLAN VIEW
FOAM PLENUM SEAL
FOAM PLENUM SEAL
CUTOUT TRIM MOLDING
FOAM PLENUM SEALS:THESE ARE PROVIDED BY THEACCESS FLOOR MANUFACTURER ANDARE RECOMMENDED TO SEALCABLE OPENINGS
LID IS 2 PART TWIST COVERFULLY CLOSED POSITION
PLAN VIEW
TO PREVENT AIR LEAKAGE
SEAL UNUSED DUPLEX OPENINGS
ATTACH BLANK INTERFACE PLATESTO UNUSED OPENINGS
OTHER COVERING ADHERED TO CURBTRANSITION STRIP OR THRESHOLD
CARPET TILE ADHERED TO ACCESS FLOORACCESS FLOOR PANEL
CUT PANELS TO WITHIN 1/16" OF WALL. IF GAP
14) PERIMETER SEAM AT CURB WHERE FLOOR COVERING IS NOT CONTINUOUS
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