3.
Underlayments:
Lay polyisocyanurate recovery board over the existing decking. The
recovery board will taper from 2 #” to &” from the edging of the building
to beth drains and from drain te drain creating a 1/8” slope to prevent
ponding water on thé new rubber membrane.
Fasten the hase materials with 3° galvanized plates and screws long enough
to penetrate the existing roofing and decking a minimum of ”.
Drip edges:
Cut and fit new 2 }s” wood perimeter around the three sides up to the 2 %”
recovery board te provide a solid surface below the new aluminum drip
edging.
Fabricate and install new heavy gauge Lead coated copper drip edges to all
the three sides of roof (to match tne existing building drip edge).
Apply RPI cured cever taping over the lead coated copper drip edging and
onto the rubber membrane,
Color to be Lead Coated Finish. Style to be as shown below:
RUBBER MEMBRANE
Roof membrane application:
Adhere 1004 of the .060" RPE EPDM rubber membrane to the underlayment
materials (fully adhered).
All field laps to be a minimum cf 6.”
Allow the membrane to extend over the roof edges and terminate below the
top of the wall covering.
Len existing gutters by extend the roof membrane and terminate along the
outer edges.
Adnere the new membrane up the brick wall and apply stainless steel
termination bars into the mortar joints using #8 x 1 4” stainless steel
fasteners.
Apply water cut-off mastic sealant behind the termination bar and over the
top of the bar te the brick surface.
Drains:
Install two new 4” RAC Insert drain systems into the existing drain piping.
These drains will be sealed into the existing cast iron drains and RPI
water cutoff mastic will be applied around the top of the drain where it is
fastened down through.
Special flashing details:
Flash all 4” pipe ventilators with RPI pre-formed pipe boot systems. Apply
RPI cover seam taping around ali edging for a secondary seal.
Apply the rubber membrane up all side walls of the roof unit and apply RPI
uncured caver tape to all four corner sections.
