C-2 Attachment 3-2 Amendment to A7.0 MRV Arch.pdf
PDF 1 MB Posted
- Attached to
- JRD Compound Heating - Ventilation - Air Conditioning & Envelope Improvements Federal contract opportunity
- Solicitation number
- 1240BJ26Q0001
- Issued by
- Department of Agriculture Forest Service
About this file
This is a construction document sheet (A7.0) for an HVAC modernization project at the Tongass National Forest Juneau Ranger District, prepared by the USDA Forest Service Alaska Region (R10).
The project involves Floor 2 of the Office Building and focuses on enclosing and insulating Forced Thermal Units (FTUs) with 10 inches of expanded polystyrene (EPS) rigid insulation on all sides, sealed with adhesive, spray foam, and tape. Key specifications include maintaining a minimum 3-inch clearance from the top of the FTU and keeping the bottom open to allow warm air circulation. The work requires 22x36-inch fire-rated insulated access panels (JL Industries FD basis of design) positioned between truss members at approximately 30 inches above finished floor, along with 24x36-inch wood frame platforms inside the truss space to allow for 18 inches of insulation underneath. Additional work includes demolishing an existing chimney, sealing all gaps in the insulation enclosure, and patching/repairing finishes to match existing conditions. The document contains a reflected ceiling plan for Floor 2 showing mechanical equipment locations, FTU enclosure plan and section details, and access panel specifications. The project number is MRV #2420, dated July 25, 2025, with a revision issued via Addendum 2 on March 18, 2026. All plans are noted as approximations requiring submission to the Contracting Officer Representative for approval prior to ordering materials.
View the file
Other files for this federal contract opportunity
Show all 18
On GovTribe
Work with this file on GovTribe
- Download the original file
- Contacts named in this file
- Similar government files
- Ask GovTribe AI about this file
Text version
DN
UP
DN
R E
F
VENDVEND
R E
FCORR.
A-211
ENTRY
A-207
RECREATION
A-201
CORR.
A-217
STAIR
A-218
FISH & WILDLIFE
A-216
OFFICE
A-216A
ENGINEERING
A-215
MINERALS
A-202
REC.
OFF.
A-201A
OFFICE
A-202A
OFFICE
A-203A
JAN.
A-204
SPECIAL USES
A-203
MEN
A-206
WOMEN
A-205
SECURITY
A-208
RANGER
A-214
CORR.
A-212
LUNCH
A-209
STAIR
A-213
CONF.
A-210
F
D
C
E
B
A
1 2 3 4 5 86 7 9 10 11
PLENUM ACCESS
4 4 4
3" MIN
3' - 0" MIN.
FTU, SIZE VARIES
MAINTENANCE SIDE
FOAM SEAL AROUND DUCTS AND PIPES
NOTE:
1. PLAN IS AN APPROXIMATION OF SIZE
AND GENERAL REQUIREMENTS. SIZE MAY
VARY TO ACCOMMODATE FRAMING
MEMBER LOCATIONS AND CLEARANCE
FOR MAINTENANCE OPERATIONS. SUBMIT
PLAN FOR EACH ENCLOSURE SIZE TO COR
FOR APPROVAL PRIOR TO ORDERING
MATERIALS.
2. ENSURE MIN 3" CLEAR FROM TOP OF
FTU. BOTTOM REMAINS OPEN TO HEAT
FROM BELOW.
M
IN
M
IN
M
IN
A7.0
10" RIGID INS. ALL SIDES
SEAL ALL JOINTS WITH
ADHESIVE/SPRAY FOAM
AND TAPE
3"
(E) 2ND FLOOR ACT
VAPOR RETARDER, LAP
INTO ENCLOSURE
PIPES AND VALVES
PER MECH
FTU, SIZE VARIES
10" RIGID INS.
10" RIGID INS.
ALL SIDES.
MAINTENANCE SIDE
KEEP 3'-0" CLEAR
DEMO VAPOR BARRIER,
OPEN TO BELOW
EXISTING ACCESS
HATCH
CUT PLY SHEATHING TO
OPENING. (ONLY ON SOUTH
WALL) DO NOT CUT TRUSS
MEMBERS. INCREASE NAILING TO
4" O.C. AT PERIMETER. PROVIDE
SOLID PERIMETER BLOCKING AND
FOIL TAPE INSULATION CUTS
PANEL ATTACHMENT FLANGE
AT SOLID BLOCKING OR TRUSS.
EXISTING FOIL FACE
INSULATION TO REMAIN CONT.
UP TO FLANGE
INSULATED ACCESS PANEL, SEE
SHEET NOTE FOR SPEC AND
LOCATION
CHECKED:
SHEET
DRAWN:
DATE:
SHEET TITLE:
PROJECT NO. OF
DESIGNER
ARCHIVE NO.
(R10)
ALASKA REGION
A7.0
ANM-JRD
COMPOUND
HVAC
MODERNIZATION
MRV #2420
FLOOR 2, OFFICE
BUILDING RCP
CONSTRUCTION DDOCUMENTS
FOR CONSTRUCTION
TONGASS NATIONAL
FOREST
07/25/2025
CJN
CJN
ZMJ
JUNEAU RANGER DISTRICT
0' 8' 16'4'1/8" = 1'-0"
1 FLOOR 2, OFFICE BUILDING RCP
NOTES:
GENERAL: MECHANICAL
EQUIPMENT SHOWN FOR CLARITY
PATCH AND REPAIR FINISHES TO
MATCH EXISTING.
ENCLOSE FTU WITH 10" EPS
INSULATION APPROXIMATELY AT
DASH. NO INSULATION UNDER THE
BOTTOM OF THE FTU TO ALLOW
WARM AIR TO CIRCULATE AROUND
THE FTU. ENSURE ENOUGH
CLEARANCE FOR MAINTENANCE.
SEAL ALL GAPS IN INSULATION
ENCLOSURE WITH SPRAY FOAM
INSULATION.
DEMO CHIMNEY. SEE MECH. SEE
ELEC FOR ELECTRICAL WORK IN
CHASE.
PROVIDE 22X36 ACCESS PANEL AT
EACH ATTIC BAY. BASIS OF
DESIGN; JL INDUSTRIES FD - FIRE-
RATED INSULATED FLUSH ACCESS
PANEL. LOCATE BETWEEN TRUSS
MEMBERS APPROX 30" A.F.F.
COORDINATE LOCATION TO AVOID
EXISTING MECH. COORDINATE
LOCATION WITH OWNER. PROVIDE
24X36 WOOD FRAME PLATFORM
INSIDE TRUSS SPACE FOR LANDING
BELOW ACCESS PANEL. ATTACH
TO TRUSS FRAMING AND DO NOT
COMPRESS EXISTING INSULATION.
ALLOW FOR 18" OF INSULATION
UNDER PLATFORM.
2 2
2 2
0' 2' 4'1'3/4" = 1'-0"
FTU ENCLOSURE, PLAN 4311
0' 2' 4'1'3/4" = 1'-0"
FTU ENCLOSURE, SECTION
NO. REVISION / ISSUE DATE
1 Addendum 2 03.18.2026
0' 1' 2'6"1 1/2" = 1'-0"
ACCESS PANEL
File details come from the government source that posted it. Updated .