Attachment M - Revised Drawings.pdf
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- Solicitation number
- N4008525R0102
About this file
This is a roofing details drawing for the Naval Facilities Engineering Systems Command (NAVFAC) project at Norfolk Naval Shipyard in Portsmouth, VA, specifically for Building 171 Ship Maintenance Machine Shop Roof Repair. The detailed technical drawing provides comprehensive specifications for a modified bitumen roofing system, including typical roofing assembly, drain flashing, base flashing for round penetrations and expansion joints, and methods for tying into existing roofing. Key technical requirements include providing tapered insulation to create a minimum 1/2 inch per foot slope, using modified bitumen base and cap sheets, installing a vapor retarder, and ensuring proper membrane lap and integration with existing roofing components. The drawing includes specific instructions for handling various roof deck types (metal and concrete), drain installations, and addressing potential moisture issues through infrared scanning.
The project is part of contract N40085-19-D-9041, with the drawing approved on 03 June 2025 by the NAVFAC Mid-Atlantic department. The technical specifications provide detailed guidance for contractors on roof replacement and repair techniques, including minimum overlay requirements, membrane patching protocols, and specific notes about handling existing roof conditions. Notable technical details include staggering insulation layers by a minimum of 3 inches, using cold-fluid applied flashing, and providing metal umbrella flashing with band clamps at various roof penetrations and edges.
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Text version
MODIFIED BITUMEN
CAP SHEET
MODIFIED BITUMEN
BASE SHEET
1/2 IN. COVER BOARD
ROOF INSULATION,
SEE NOTE 1
VAPOR
RETARDER
EXISTING METAL
DECK, SEE NOTE 3
1/2 IN. ROOF
SHEATHING BOARD,
SEE NOTE 3
N O
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M A
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NOTES:
1. PROVIDE TAPERED INSULATION TO CREATE A MINIMUM 1/2 IN./FT. SLOPE FOR FULL AREA REPLACEMENTS OR TO
MATCH EXISTING ROOF SLOPE FOR PARTIAL AREA REPLACEMENTS.
2. EXISTING RECORD DRAWINGS INDICATE A TYPICAL BASE LAYER INSULATION THICKNESS OF APPROXIMATELY 3 IN.
CONTACT THE CONTRACTING OFFICER IF CONTINUOUS BASE LAYER OF INSULATION IF FOUND TO BE LESS THAN 2 IN.
THICK.
3. SOME ROOF AREAS INCLUDE CONCRETE ROOF DECK. WHERE CONCRETE DECK IS PRESENT, OMIT ROOF BOARD AND
ADHERE VAPOR RETARDER DIRECTLY TO CONCRETE.
PROVIDE TAPERED EDGE STRIPS
TO CREATE SUMP AROUND
DRAIN. SEE NOTES 1 AND 2
EXISTING PRIMARY OR OVERFLOW ROOF DRAIN BOWL; REMOVE AND
REINSTALL CLAMPING RING AND STRAINER TO ACCOMMODATE ROOFING WORK
EXISTING DRAIN PIPE
CL
COLD-FLUID APPLIED FLASHING; PROVIDE 24 IN. BEYOND
CENTER LINE OF DRAIN, EXTEND INTO DRAIN BOWL
MODIFIED BITUMEN TARGET SHEET; PROVIDE
30 IN. BEYOND CENTER LINE OF DRAIN
MODIFIED BITUMEN
BASE SHEET
MODIFIED BITUMEN CAP SHEET
1/2 IN. COVER BOARD
NOTES:
1. PROVIDE A MINIMUM OF 3/4 IN. / FT. SLOPE WITHIN THE DRAIN SUMP.
2. SUMP APPLIES TO PRIMARY DRAIN ONLY.
EXISTING ROOF DECK
D E
T A
IL
C
/A
E
T Y
P R
O O
F
IN
G A
S S
E M
B L Y
WATER CUT OFF MASTIC
METAL UMBRELLA FLASHING;
SECURE WITH BAND CLAMP
D E
T A
IL
C
/A
E
T Y
P R
O O
F
IN
G A
S S
E M
B L Y
BAND CLAMP; PROVIDE AT
TOP EDGE OF MEMBRANE
MODIFIED BITUMEN CAP SHEET
MODIFIED BITUMEN BASE PLY
CANT
M
IN
EXTEND VAPOR RETARDER
ONTO VERTICAL SURFACE OF
PENETRATION
METAL COPING; PROVIDE
ALONG LENGTH OF REPAIR.
PROVIDE CONTINUOUS
CLEATS ON BOTH SIDES
FASTENED TO EXISTING
CURB @ 8" O.C.
EXISTING WOOD CURB; TO REMAIN
EXISTING ROOFING
COMPONENTS; TO REMAIN
FLASHING MEMBRANE; INTEGRATE
WITH EXISTING EXPANSION JOINT
SEAL AND FASTEN TO TOP VERTICAL
EDGE OF CURB
NOTES:
1. DETAIL ILLUSTRATES ROOFING REPLACEMENT ALONG ONE SIDE OF EXPANSION JOINT. MIRROR REPAIRS
SHOWN IF REPLACEMENT IS REQUIRED ALONG BOTH SIDES OF JOINT.
CANT
EXTEND VAPOR RETARDER
ONTO VERTICAL SURFACE OF
CURB
D E
T A
IL
C
/A
E
T Y
P R
O O
F
IN
G A
S S
E M
B L Y
EXISTING EXPANSION
JOINT SEAL; TO REMAIN
6"
6"
E X
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IN
G
R O
O F
IN
G
A S
S E
M B
L Y
LAP VAPOR RETARDER ONTO
EXISTING VAPOR RETARDER A
MINIMUM OF 6 IN., SEE NOTE 1
MODIFIED-BITUMEN MEMBRANE; LAP BASE
AND CAP SHEET ONTO CLEAN, WELL-
BONDED EXISTING MEMBRANE A MINIMUM
OF 6 IN. AND ACCORDING TO
MANUFACTURERS WRITTEN INSTRUCTIONS
D E
T A
IL
C
/A
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T Y
P R
O O
F
IN
G A
S S
E M
B L Y
NOTES:
1. IF EXISTING VAPOR RETARDER IS NOT PRESENT, LAP ONTO EXISTING DECK.
EXISTING MODIFIED BITUMEN MEMBRANE:
TO REMAIN.
STAGGER INSULATION
LAYERS A MINIMUM OF 3 IN.
DISCONTINUITY (SEE NOTE 2) IN THE EXISTING ROOFING
MEMBRANE, MAXIMUM 6 IN. DIAMETER. PERFORM
LOCALIZED PATCHING/REPLACEMENT OF ROOFING. TIE
ROOFING INTO EXISTING COMPONENTS TO RESTORE
WATERTIGHT CONDITION.
MODIFIED-BITUMEN MEMBRANE;
PROVIDE BASE LAYER AND CAP SHEET.
LAP ONTO CLEAN WELL BONDED
EXISTING MEMBRANE A MINIMUM OF 6 IN.
AND ACCORDING TO MANUFACTURERS
WRITTEN INSTRUCTIONS, SEE NOTE 1
E X
IS
T
IN
G
R O
O F
IN
G
A S
S E
M B
L Y
NOTES:
1. CONTRACTORS ARE REQUIRED TO PERFORM A FULL MOISTURE IR SCAN TO CONFIRM/IDENTIFY EXTENTS OF
WET INSULATION PRIOR TO COMMENCING REPAIRS. WET INSULATION IS TO BE REMOVED AND REPLACED PER
DETAIL .
2. DISCONTINUITY IS DEFINED AS HOLE THROUGH MEMBRANE, OPEN SEAM, DEBONDED MEMBRANE LAYERS, OR OTHER VISIBLE DEFICIENCY PRESENT ON THE SURFACE OF THE EXISTING ROOFING MEMBRANE.
6" MIN. 6" MIN.
/C1 AE500
VIRGINIA BEACH, VIRGINIA 23462
4525 MAIN STREET, SUITE 1400
757·455·5800
SATISFACTORY TO DATE
APPROVED
ACTIVITY
FOR COMMANDER NAVFAC
SEAL
A/E INFO
A
B
C
D
1 2 3 4 5
1 2 3 4 5
A
B
C
D
SCALE:
CONSTR. CONTR. NO.
SHEET
NAVFAC DRAWING NO.
DES DRW CHK
OF
EPROJECT NO.:
D E
P A
R T
M E
N T
O F
T H
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A V
Y N
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IE
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M A
N D
DRAWFORM REVISION: 25 AUGUST 2020
PM/DM
BRANCH MANAGER
CHIEF ENG/ARCH
FIRE PROTECTION
N A
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AS NOTED
MW/RC
JWJ
HPN
APPROVED BY JOSEPH SINGER,
900F DEPARTMENT HEAD, VIA EMAIL.
03 JUNE 2025
AE500
N N
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TFC
12928722
JDK MAR
1654300
N40085-19-D-9041
P O
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DJD
3" = 1'-0"C1
TYP. ROOFING ASSEMBLYC1
3" = 1'-0"C2
TYP. DRAIN FLASHINGC2
3" = 1'-0"A1
BASE FLASHING - TYP. ROUND PENETRATIONA1
3" = 1'-0"(AE112) C4
BASE FLASHING - EXPANSION JOINTC4
3" = 1'-0"(AE110) A2
TIE-IN TO EXISTING ROOFING TO REMAINA2
3" = 1'-0"A4
ROOFING MEMBRANE PATCHA4
S Y
M D
E S
C R
IP
T
IO
N
D A
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A P
P R
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JDKerr Image
JDKerr Image
| Sheets |
| AE500 - ROOFING DETAILS |
| 2026-01-08T08:22:12-0500 | |
| Jeffrey D Kerr | |
| I am approving this document |
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