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title: Interior Painting
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description: >
When to use: Field-applied surface preparation, primers, and finish coatings on interior architectural substrates — gypsum board, plaster and veneer plaster, concrete, concrete masonry, ferrous and galvanized metal, and interior wood — in commercial, institutional, and multi-family residential buildings. Covers latex, alkyd, and water-based epoxy paint systems applied to walls, ceilings, doors and frames, exposed structure, and exposed mechanical and electrical work that is to be field-painted.
− Not intended for: Exterior painting (see [[syncs/exterior-painting]]); high-performance industrial or chemical-resistant coatings for process areas, kitchens, and wet environments; intumescent fireproofing (see [[syncs/fireproofing]]); shop-applied or factory finishes on metal fabrications, casework, and architectural metals; floor coatings, traffic coatings, and waterproof membranes; concrete sealers and curing compounds; coatings on continuously wet surfaces such as shower walls; or specialty decorative finishes such as Venetian plaster, gilding, and faux finishes.
+ Not intended for: Exterior painting (see [[sync/exterior-painting]]); high-performance industrial or chemical-resistant coatings for process areas, kitchens, and wet environments; intumescent fireproofing (see [[sync/fireproofing]]); shop-applied or factory finishes on metal fabrications, casework, and architectural metals; floor coatings, traffic coatings, and waterproof membranes; concrete sealers and curing compounds; coatings on continuously wet surfaces such as shower walls; or specialty decorative finishes such as Venetian plaster, gilding, and faux finishes.
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## A finish coat is only as good as the preparation and primer beneath it; the most common cause of paint failure is inadequate surface preparation, not defective paint. {note}
−## The Contractor shall coordinate substrate readiness with [[syncs/gypsum-board-assemblies]] for joint treatment and finish levels, with [[syncs/doors-frames-and-hardware]] for hollow metal frames to be field painted, with [[syncs/fireproofing]] for the boundary between intumescent fireproofing and decorative paint, and with [[syncs/firestopping]] for sealants and joint treatments adjacent to painted surfaces.
+## The Contractor shall coordinate substrate readiness with [[sync/gypsum-board-assemblies]] for joint treatment and finish levels, with [[sync/doors-frames-and-hardware]] for hollow metal frames to be field painted, with [[sync/fireproofing]] for the boundary between intumescent fireproofing and decorative paint, and with [[sync/firestopping]] for sealants and joint treatments adjacent to painted surfaces.
## Where paint is applied over substrates governed by other standards, the surface preparation and finish requirements of this standard control unless the referenced standard imposes a more stringent requirement.
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### The Contractor shall request supplemental construction lighting where the available illumination does not allow proper film inspection.
−### The lighting available during construction is rarely the same as the lighting under which the finished work will be viewed; specifying a Level 5 gypsum finish (per [[syncs/gypsum-board-assemblies]]) and a flat paint will not hide telegraphing if the construction lighting is dim and the finished space is brightly lit by clerestories or track fixtures. {note}
+### The lighting available during construction is rarely the same as the lighting under which the finished work will be viewed; specifying a Level 5 gypsum finish (per [[sync/gypsum-board-assemblies]]) and a flat paint will not hide telegraphing if the construction lighting is dim and the finished space is brightly lit by clerestories or track fixtures. {note}
## Ventilation {toc}
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## Gypsum Board {toc}
−### Gypsum board shall be at the finish level required by the room finish schedule (see [[syncs/gypsum-board-assemblies]] for finish level definitions).
+### Gypsum board shall be at the finish level required by the room finish schedule (see [[sync/gypsum-board-assemblies]] for finish level definitions).
### Joints, fastener heads, and accessories shall be fully treated, sanded smooth, and dust-free.
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### Failures caused by inadequate humidity control during the warranty period — for example, persistent condensation on cool walls in an under-ventilated space — are excluded as environmental, not workmanship.