Access Floors. Architect s Guide for Detailing & Specifying Access Floor Air Plenums. SustainAbility to the Power of

Transcription

1 Access Floors Architect s Guide for Detailing & Specifying Access Floor Air Plenums SustainAbility to the Power of 1

2 Access floor air plenum integrity begins with proper design and specification. 2

3 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 constructing 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 throughout the entire design process. There are six primary recommendations. An overview and explanation of each recommendations is provided below followed by proposed specification language and construction details. Design: Pre-Bid Meeting: Pre-Construction: Mock-up: 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. The requirement for pre-bid meetings to inform all subcontractors of the plenum sealing and mock-up construction requirements should be specified. Pre-construction meetings should also be specified to reaffirm the plenum sealing requirements to each sub-contractor division. 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. 3

4 Downloadable Specifications & Details Visit 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 CSI Specifications for Consideration The following is Tate s recommended access floor air plenum sealing specification language to insert into the CSI specifications for subcontractors. All of the specifications can be downloaded on-line at 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. 4

5 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 10% of the design airflow for category 1* leakage, and 10% of the design airflow for category 2 leakage when tested at the typical static pressure range of Pascals. Note:There are two basic categories of UFAD air leakage. Category 1 leakage occurs outside of the intended occupied zone. Category 2 leakage 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 system, all leakage and short-circuited air enters the return plenum and will not reach the intended zone. *The allowable Category 1 leakage number used to commission UFAD systems is higher than overhead distribution. This higher number is used because the entire HVAC system from supply point to diffuser is being tested in a UFAD system. By comparison overhead systems typically only test the trunk or high and medium pressure ducts. The test being performed on a UFAD system would be the equivelant to using the following equation on an overhead system: Leakage = supply duct + VAV box + low pressure duct + flex duct + diffuser & flex connection. 5

6 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 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 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 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 5 contractors are required to be properly sealed to prevent air leakage. 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 penetrations 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 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 carpeting contractors are required to be properly sealed to prevent air leakage. 6

7 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 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 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 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 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 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 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 cleanliness. 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. 7

8 Construction Details for Consideration The following are typical sealing details that should be considered to ensure UFAD plenum integrity. All of the details can be downloaded on-line at: Underfloor Air Sealing Locations PLAN VIEW WITHOUT ACCESS FLOOR DETAIL G TELCOM ELECTRICAL DETAIL I & K DETAIL E DETAIL D DETAIL F 8

9 DETAIL A MECHANICAL DETAIL B MENS JANITOR WOMENS KITCHEN DETAIL C ELECTRICAL DETAIL L & M TELCOM DETAIL N 9

10 Base Building Core & Shell Sealing Details A) PERIMETER SEAM ALONG SLAB AND EXTERIOR WALL INTERIOR WALL ASSEMBLY CURTAIN WALL SEAL AT SLAB LINE B) ENCLOSED COLUMN SEAM AT SLAB LINE STRUCTURAL COLUMN WALL ASSEMBLY (TYP) SEAL AT SLAB LINE C) DRYWALL PARTITION CONDITION SCHEDULED GWB SEAL AT SLAB LINE 10

11 D) BASE OF STAIRS ON BUILDING SLAB STAIR TREAD (TYP) SEAL SEAM BETWEEN STAIR AND CURB OR OTHER SUPPORT SEAL AT SLAB LINE CONCRETE CURB OR STRUCTURAL STEEL WITH FULL ENCLOSURE E) TOP OF STAIR INTERFACE WITH CONCRETE CURB OR STRUCTURAL STEEL WITH FULL ENCLOSURE SEAL AT SLAB LINE STAIR TREAD (TYP) F) ELEVATOR SHAFT TOP OF BELOW STAIR INTERFACE ACCESS WITH CONCRETE FLOOR DECK LINE ELEVATOR DOORS CONCRETE CURB OR STRUCTURAL STEEL WITH FULL ENCLOSURE ELEVATOR THRESHOLD SEAL AROUND FULL ENCLOSURE 11

12 G) EXPANSION JOINT IN EXPANSION JOINT SEAL JOINT EXPANSION JOINT IN HVAC System Sealing Details H) OPENING IN SLAB FOR VERTICAL DUCTS VERTICAL DUCT SEAL SPACE AROUND DUCT I) OPENING IN PLENUM WALLS FOR DUCTS DUCT THROUGH WALL SEAL SPACE AROUND DUCT 12

13 Plumbing Sealing Details J) PIPE PENETRATION THROUGH SEAL AROUND PIPE PIPE PENETRATION THROUGH K) PIPE PENETRATION THROUGH PLENUM WALLS SEAL AROUND PIPE PIPE O.D. WALL ASSEMBLY 13

14 Electrical System Sealing Details l) CONDUIT THROUGH PLENUM WALLS SEAL AROUND CONDUIT CONDUIT (AND CABLE BUNDLE) O.D. WALL ASSEMBLY CONDUIT M) OPEN ENDS OF CONDUIT IN THE CONDUIT PLENUM THROUGH SPACE PLENUM WALL OUTLET WALL ASSEMBLY CONDUIT SEAL OPENING AT CONDUIT PENETRATION SEAL OPEN END OF CONDUIT IN PLENUM THERMOSTAT WALL ASSEMBLY CONDUIT SEAL OPENING AT CONDUIT PENETRATION SEAL OPEN END OF CONDUIT IN PLENUM 14

15 Voice/Data System Sealing Details N) CABLE PENETRATIONS THROUGH PLENUM WALL WITH CABLE SLEEVE SEAL AROUND CABLE SLEEVE CABLE SLEEVE O.D. SEAL AROUND CABLES INSIDE SLEEVE WALL ASSEMBLY CAPPED ENDS OF UNUSED CABLE SLEEVE (TYP) CABLE BUNDLE CABLE PENETRATIONS THROUGH PLENUM WALL WITH CABLE SLEEVES 15

16 Access Floor Air Sealing Locations PLAN VIEW WITH ACCESS FLOOR INSTALLED DETAIL 1 & 3 DETAIL 12 DETAIL 4 & 5 TELCOM ELECTRICAL DETAIL 9 & 10 6 RAISED PODIUM DETAIL 8 16

17 DETAIL 2 DETAIL 13 DETAIL 6 & 7 MECHANICAL MENS JANITOR KITCHEN WOMENS ELECTRICAL TELCOM DETAIL 14 17

18 Access Floor Sealing Details 1) PLENUM DIVIDERS PANEL FASTENED TO PEDESTAL HEAD WITH COMBO CORNERLOCK SCREW ACCESS FLOOR PANEL ATTACH PLENUM CHANNEL WITH STRINGER SCREWS FIELD APPLIED GASKET TAPE JOINTS WITH METAL FOIL TAPE 2.4m LONG GALVANIZED STEEL HAT CHANNEL FASTEN WITH TEK SCREWS 26 GA. X 1.8m STEEL BOTTOM ANGLE CUT AS REQUIRED SO THAT IT DOES NOT EXTEND ABOVE HAT CHANNEL FIELD APPLIED TATE PLENUM GASKET P/N TAPE JOINTS WITH METAL FOIL TAPE WHERE BOTTOM ANGLE SECTIONS MEET AND WHERE HAT CHANNEL SECTIONS MEET TAPE JOINTS WITH METAL FOIL TAPE WHERE HAT CHANNEL AND BOTTOM ANGLE MEET BOTTOM ANGLE SET IN FIELD APPLIED CONTINUOUS ADHESIVE BEAD 2) AIR HIGHWAYS FIELD APPLIED GASKET AT HAT CHANNEL AND STRINGERS (TYP) ACCESS FLOOR PANELS STRINGERS (TYP) PEDESTAL (TYP) HAT CHANNEL METAL FOIL TAPE AT JOINTS 18

19 3) PENETRATIONS THROUGH PLENUM DIVIDERS PLENUM DIVIDER ASSEMBLY CABLE SLEEVE (FIRESTOP OR PUTTY INSIDE OF SLEEVE) SEAL TO FILL GAP (TYP) WATER PIPE(S) CONDUIT METAL FOIL TAPE AT JOINTS 4) PERIMETER SEAM WITHOUT WALL BASE PENETRATIONS THROUGH PLENUM DIVIDER WALL EXTENDS TO SUBFLOOR ACCESS FLOOR PANEL SEAL AT FLOOR/WALL LINE CUT PANELS TO WITHIN 1.6MM OF WALL SEAL AT SLAB LINE 5) PERIMETER SEAM WITH WALL BASE ACCESS FLOOR PERIMETER SEAL WITHOUT WALL BASE CUT CARPET TO WALL AND ADHERE TO ACCESS FLOOR WITH RELEASABLE ADHESIVE ACCESS FLOOR PANEL WALL EXTENDS TO SUBFLOOR WALL BASE (WHERE USED) CUT PANELS TO WITHIN 1.6MM OF WALL SEAL AT SLAB LINE ACCESS FLOOR PERIMETER SEAL WITH WALL BASE 19

20 6) PERIMETER SEAM AT NON-SMOOTH WALLS & COLUMNS 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 7) ACCESS FLOOR SEAL AT FASCIA / EXPOSED EDGE WHERE GAPS OCCUR BETWEEN THE EDGE OF THE ACCESS FLOOR AND FASCIA, APPLY DUCT OR METAL TAPE TO SEAL JOINT PRIOR TO APPLICATION OF CARPET. FIRE RATED CAULK OR SEALANT TRIM ANGLE GUARDRAIL POST ATTACH TRIM ANGLE OVER CARPET AND FASCIA PLATE CUT CARPET TO FASCIA PLACE AND ADHERE TO ACCESS FLOOR WITH RELEASABLE ADHESIVE ACCESS FLOOR PANEL FASCIA PLATE (cut to meet edge of access floor) BOTTOM ANGLE 8) PERIMETER SEAM AT ELEVATOR SHAFT Access Floor Seal At Fascia / Exposed Edge 1.6MM 20

21 9) PERIMETER SEAM AT TOP OF STAIR LANDING CONCRETE CURB OR STRUCTURAL STEEL WITH FULL ENCLOSURE SEAL AROUND ENCLOSURE CUT PANELS TO WITHIN 1.6MM OF CURB STAIR TREAD (TYP) ACCESS FLOOR PERIMETER SEAL AT TOP OF STAIR 10) PERIMETER SEAM AT BASE OF STAIR LANDING STAIR TREAD (TYP) SEAL SEAM AROUND ENCLOSURE CUT PANEL TO WITHIN 1.6MM OF STAIR CONCRETE CURB OR STRUCTURAL STEEL WITH FULL ENCLOSURE ACCESS FLOOR PERIMETER SEAL AT BASE OF STAIR 11) PENETRATION IN WALL THROUGH ACCESS FLOOR 21

22 FOAM GASKET ATTACHED 12) PERIMETER SEAM AT FIRE BARRIER BELOW DOOR THRESHOLD OPTION 1: ATTACH THRESHOLD WITH GASKET ON UNDERSIDE CONCORE OR ALL STEEL ACCESS FLOOR PANEL OPTION 2: APPLY SEALANT OR ATTACH GASKET TO BARRIER TO SEAL JOINTS PERIMETER PEDESTAL SUPPORT SHEETROCK FACED FIRE BARRIER SEAL AT SLAB LINE Access Floor Seal At Fire Barrier Below Door Threshold 13 PERIMETER SEAM AT CURB WHERE FLOOR COVERING IS CONTINUOUS CARPET TILE ADHERED TO ACCESS FLOOR AND CURB ACCESS FLOOR PANEL CUT PANELS TO WITHIN 1.6MM OF WALL. FOAM GASKET ATTACHED TO CURB TO SEAL JOINT ACCESS FLOOR SEAL AT CURB CONTINUOUS FLOOR COVERING FROM ACCESS FLOOR TO CURB 14) PERIMETER SEAM AT CURB WHERE FLOOR COVERING IS NOT CONTINUOUS OTHER COVERING ADHERED TO CURB TRANSITION STRIP OR THRESHOLD CARPET TILE ADHERED TO ACCESS FLOOR ACCESS FLOOR PANEL CUT PANELS TO WITHIN 1.6MM OF WALL. IF GAP 22

23 15) CABLE CUTOUTS & GROMMETS PLAN VIEW GROMMET WITH LID PLAN VIEW FOAM PLENUM SEAL CUTOUT TRIM MOLDING SECTION THROUGH CUTOUT FOAM PLENUM SEAL LID IS 2 PART TWIST COVER FULLY CLOSED POSITION TO PREVENT AIR LEAKAGE FOAM PLENUM SEALS: THESE ARE PROVIDED BY THE ACCESS FLOOR MANUFACTURER AND ARE RECOMMENDED TO SEAL CABLE OPENINGS CABLE CUTOUT & SEAL ASSEMBLY 16) POWER, VOICE/DATA DISTRIBUTION BOXES IN ACCESS FLOOR PANELS SEAL UNUSED DUPLEX OPENINGS ATTACH BLANK INTERFACE PLATES TO UNUSED OPENINGS POWER, VOICE, AND DATA DISTRIBUTION BOX 17) PIPE PENETRATION THROUGH ACCESS FLOOR SEAL AROUND PIPE 23

24 Tate Access Floors Pty. Ltd. 28 Biloela Street, Villawood NSW 2163 Tel: Fax: tatetasman.com.au kingspan.com Corporate Headquarters: 7510 Montevideo Road, Jessup, MD Tate Hotline: Tel: Fax: Production Facilities: 7510 Montevideo Road, Jessup, MD Springvale Road, Red Lion, PA tateinc.com kingspan.com Tate Access Floors, Inc. components are proudly made in the U.S.A. A member of MEMBER Tate Building Technology Platform, ConCore, GrateAire, PosiLock, PosiTile, PVD Servicenter, Floating Floors, Integral Trim, SustainAbility and AirArrest are registered trademarks of Tate Access Floors, Inc. DirectAire TM, SmartAire TM and PowerAire TM are trademarks of Tate Access Floors, Inc Tate Access Floors, Inc. Revised 2010 Version /10