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Title: Section 2507  •  Size: 6934

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SECTION 2507 - INTERIOR PLASTER

2507.1 General. Plastering with gypsum plaster or cement plaster shall not be less than three coats when applied over metal lath or wire fabric lath and shall not be less than two coats when applied over other bases permitted by this chapter. Showers and public toilet walls shall conform to Section 807.1.

Plaster shall not be applied directly to fiber insulation board. Cement plaster shall not be applied directly to gypsum lath, gypsum masonry or gypsum plaster except as specified in Section 2506.3.

When installed, grounds shall assure the minimum thickness of plaster as set forth in Table 25-D. Plaster thickness shall be measured from the face of lath and other bases.

2507.2 Base Coat Proportions. Proportions of aggregate to cementitious materials shall not exceed the volume set forth in Table 25-E for gypsum plaster and Table 25-F for cement plaster.

2507.3 Base Coat Application.

2507.3.1 General. Base coats shall be applied with sufficient material and pressure to form a complete key or bond.

2507.3.2 Gypsum plaster. For two-coat work, the first coat shall be brought out to grounds and straightened to a true surface, leaving the surface rough to receive the finish coat. For three-coat work, the surface of the first coat shall be scored sufficiently to provide adequate bond for the second coat and shall be permitted to harden and set before the second coat is applied. The second coat shall be brought out to grounds and straightened to a true surface, leaving the surface rough to receive the finish coat.

2507.3.3 Cement plaster. The first two coats shall be as required for the first coats of exterior plaster, except that the moist-curing time period between the first and second coats shall not be less than 24 hours and the thickness shall be as set forth in Table 25-D. Moist curing shall not be required where job and weather conditions are favorable to the retention of moisture in the cement plaster for the required time period.

2507.4 Finish Coat Application. Finish coats shall be applied with sufficient material and pressure to form a complete bond. Finish coats shall be proportioned and mixed in an approved manner. Gypsum and lime and other interior finish coats shall be applied over gypsum base coats which have hardened and set. Thicknesses shall not be less than 1/16 inch (1.6 mm).

Cement plaster finish coats may be applied over interior cement plaster base coats which have been in place not less than 24 hours.

Approved acoustical finish plaster may be applied over any base coat plaster, over clean masonry or concrete, or other approved surfaces.

2507.5 Interior Masonry or Concrete. Condition of surfaces shall be as specified in Section 2508.8. Approved specially prepared gypsum plaster designed for application to concrete surfaces or approved acoustical plaster may be used. The total thickness of base coat plaster applied to concrete ceilings shall be as set forth in Table 25-D. Should ceiling surfaces require more than the maximum thickness permitted in Table 25-D, metal lath or wire fabric lath shall be installed on such surfaces before plastering.

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