D+GA Project No. 9926
EPDM Single-Ply Membrane Roofing
16 October 2001
07531 - 5
3.02
PREPARATION:
A.
Clean substrate of dust, debris, and other substances detrimental to roofing installation according to roofing system
manufacturer's written instructions. Remove sharp projections.
B.
Prevent materials from spilling or migrating onto surfaces of other construction.
C.
Complete terminations and base flashings and provide temporary seals to prevent water from entering completed
sections of the roofing system at the end of the workday or when rain is forecast. Remove and discard temporary seals
before beginning work on adjoining roofing.
3.03
INSULATION INSTALLATION:
A.
Coordinate installing roofing system components so insulation is not exposed to precipitation or left exposed at the end
of the workday.
B.
Comply with roofing system manufacturer's written instructions for installing roof insulation.
C.
Install insulation in two layers of boards to achieve required thickness of insulation indicated, with side and end joints in
top layer of boards offset from side and end joints in bottom layer.
D.
Install insulation with long joints of insulation in a continuous straight line with end joints staggered between rows,
tightly abutting edges and ends between boards.
1.
Cut and fit insulation within 1/4 inch of nailers, projections, and penetrations.
E.
Attached Insulation: Install each layer of insulation and secure to deck using mechanical fasteners specifically designed
and sized for fastening specified board-type roof insulation to deck type indicated..
1.
Fasten insulation according to requirements of FM's "Approval Guide" for specified Windstorm Resistance
Classification and the insulation and roofing system manufacturers' written instructions.
3.04
ADHERED SHEET INSTALLATION:
A.
Install EPDM sheet over area to receive roofing according to roofing system manufacturer's written instructions.
Unroll sheet and allow to relax for a minimum of 30 minutes.
B.
Start installation of sheet in presence of roofing system manufacturer's technical personnel.
C.
Accurately align sheets and maintain uniform side and end laps of minimum dimensions required by manufacturer.
Stagger end laps.
D.
Apply bonding adhesive to substrate and underside of sheet at rate required by manufacturer and allow to partially
dry. Do not apply bonding adhesive to splice area of sheet.
E.
Adhesively fasten sheet securely at terminations and perimeter of roofing.
F.
Apply roofing sheet with side laps shingled with slope of roof deck where possible.
G.
Spread sealant or mastic bed over deck drain flange at deck drains and securely seal roofing sheet in place with
clamping ring.
3.05
SEAM INSTALLATION:
A.
Clean both faces of splice areas, apply splicing cement, and firmly roll side and end laps of overlapping sheets according
to manufacturer's written instructions to ensure a watertight seam installation. Apply lap sealant and seal exposed
edges of sheet terminations.
1.
Apply a continuous bead of in-seam sealant before closing splice if required by roofing system manufacturer.
