826Damp proofing or Waterproofing Material

826.1 General Description

This section includes the requirements for material used as a mopping coat in damp proofing or as mopping cement for a waterproof membrane system.

826.1.01 Related References

A. Standard Specifications General Provisions 101 through 150. B. Referenced Documents AASHTO M 118 AASHTO M 121

826.2 Materials

826.2.01 Bituminous Material for Damp proofing or Waterproofing

A. Requirements Use a bituminous material that contains a primer coat and a sealer or mopping coat. Primer Use a primer coat that meets the requirements of AASHTO M 121. Sealer or Mopping Coat Use a coal-tar pitch that meets the requirements of AASHTO M 118. Coal-Tar Pitch Types Unless otherwise specified, use pitch Type I or Type II, as defined below, only when required by the Contract. Use Type I on vertical surfaces and Type II on flat surfaces. a. Type I Pitch A mopping coat for built-up roofs surfaced with slag or gravel. If the roof has nails, use the coat on inclines not exceeding 3 in./ft. (75 mm/300 mm). If the roof does not have nails, use the coat on inclines not exceeding 1 in./ft. (25 mm/300 mm). A mopping coat for damp proofing or a plying cement for building a membrane system of waterproofing above ground level. Do not use this material if it will be exposed to temperatures over 125 °F (52 °C). NOTE: This type of coal-tar pitch is suitable on railroad bridges, tanks, retaining walls, culverts, dams, conduit, etc. b. Type II Pitch A mopping coat for damp proofing or a plying cement in building a membrane system of waterproofing below ground level. Use this material for roofs exposed to moderate temperatures during installation and service. B. Fabrication General Provisions 101 through 150. C. Acceptance See the requirements in AASHTO M 118 and M 121. D. Materials Warranty General Provisions 101 through 150.