2.1.3.2
Elastomeric Membrane Underlayment
Membrane shall be a cold applied composite self-adhering membrane of not
less than 0.10 mm 0.004 inch high strength polyethylene film with slip
resistant embossing, coated on one side with a thick layer of
adhesive-consistency rubberized asphalt, interwound with a disposable
silicone coated release sheet. The tensile strength and elongation values
shall be not less than 1.7 MPa 250 psi when tested in accordance with ASTM
D 412 and pliability shall be unaffected when tested in accordance with
ASTM D 146.
2.1.3.3
Elastomeric Membrane Accessories
Two component urethane, mastic and primer shall be as approved by the
membrane manufacturer. Flashing, expansion joint covers, temporary UV
protection and corner fillets shall be as recommended by the membrane
manufacturer.
2.1.4
Nails
Nails shall be large-headed slater's solid copper nails of Number 10 or 11
gauge metal. Nails shall be 3d for slates 450 mm 18 inch or less in
length; 4d nails shall be used for slates 500 mm 20 inch or longer, and 6d
nails shall be used for slates on hips and ridges. Thicker slates require
longer and heavier gauge nails. The proper size shall be determined by
adding 25 mm 1 inch to twice the thickness of the slate. Nails shall be of
sufficient length to adequately penetrate the roof sheathing. Nails used
to retain copper flashing and slate at rake edges, hips, ridges, and eaves
prone to wind damage shall be of the ring shank design.
2.1.5
Flashing
Flashing shall be 0.57 kg 20 ounce, light cold-rolled temper (H00) copper
conforming to ASTM B 370. Flashing shall be in accordance with the
requirements as specified in Section 07600 FLASHING AND SHEET METAL.
2.1.6
Elastic Cement
Elastic cement shall be an approved brand of waterproof elastic slater's
cement colored to match as nearly as possible the general color of the
slate.
2.1.7
Acid Neutralizing Wash
**************************************************************************
NOTE: In areas of the country where past burning of
fossil fuels has caused acid staining of slate roofs
and existing portions of the roof are being reused
or are to remain in place, application of an acid
neutralizing wash is recommended. Edit
specification to meet project requirements.
**************************************************************************
Acid neutralizing wash shall be non-destructive wash formulated to
neutralize the effects of acid deposits resulting from the past burning of
fossil fuels (particularly coal). The wash shall not change the color,
appearance, or life of the slate roof, copper flashing and accessories,
underlayment, adhesives or the wall surfaces of the building.
SECTION 07310
Page 8
Previous Page
