Tag: adhesives

Asphalt Roof Cement

A trowelable mixture of solvent-based bitumen, mineral stabilizers, other fibers and/or fillers. Classified by ASTM Standard D 2822-1 Asphalt Roof Cement, and D 4586-2 Asphalt Roof Cement, Asbestos-Free, Types I and II. Type I is sometimes referred to as “plastic cement,” and is made from asphalt characterized as self-sealing, adhesive and ductile, and conforming to ASTM Specification D 312, Type I; Specification D 449, Types I or II; or Specification D 946. Type II is generally referred to as “vertical-grade flashing cement,” and is made from asphalt characterized by a high softening point and relatively low ductility, and conforming to the requirement of ASTM Specification D 312, Types II or III; or Specification D 449, Type III.

See Plastic cement and Flashing cement.

Bond

The adhesive and/or cohesive forces holding two components in positive contact.

Cohesion

The molecular forces of attraction by which the body of a material is held together.

Contact Cements

Adhesives used to adhere or bond various roofing components. These adhesives adhere mated components immediately on contact of surfaces to which the adhesive has been applied.

Flashing Cement

A trowelable mixture of solvent-based bitumen and mineral stabilizers that may include asbestos or other inorganic or organic fibers. Generally, flashing cement is characterized as vertical-grade, which indicates it is intended for use on vertical surfaces. (see Asphalt Roof Cement and Plastic Cement.)

Lap Cement

An asphalt-based roof cement formulated to adhere overlapping plies or asphalt roll roofing.

Loose-Laid Membrane

A ballasted roofing membrane that is attached to the substrate only at the edges and penetrations through the roof.

Mastic

A thick adhesive material used as a cementing agent for holding waterproofing membrane in place. (see Asphalt roof cement).

Peel Strength

The average load per unit width required to separate progressively a flexible member from a rigid member or another flexible member.

Plastic Cement

a roofing industry generic term used to describe asphalt roof cement that is a trowelable mixture of solvent-based bitumen, mineral stabilizers, and other fibers and/or fillers. Generally, intended for use on relatively low slopes, not vertical surfaces. (also see Asphalt roof cement and Flashing cement.)

Release Tape (Release Strip)

A plastic film or paper strip that is applied to the back of self-sealing shingles and other materials. The strip prevents the material from sticking together in the roll or bundle. With asphalt shingles, the strip need not be removed for application of the shingles.

Roof Cement

see Asphalt roof cement or Coal tar roof cement

Slip Sheet

Sheet material, such as reinforced kraft paper, rosin-sized paper, polyester scrim or polyethylene sheeting, placed between two components of a roof assembly (such as between membrane and insulation or deck) to ensure that no adhesion occurs between them and to prevent possible damage from chemical incompatibility, wearing or abrasion of the membrane.