Painting works on canopies, eaves, balconies, and stair soffits: classify by position into ceiling-surface coating items, not by indoor/outdoor (Beijing DB11/T 2382-2024)

Topic Positioning

Item application for painting (putty, paint) on canopy undersides, eaves, balcony slabs, and stair soffits in consumption/budget norms. Core conclusion: such upward-facing soffits take the "ceiling surface" caliber, not interior/exterior wall paint by location.

Core Conclusions

1. Position classification — Beijing DB11/T 2382-2024, 4.14.2: "Plastering of eaves, canopies, balconies, stairs, and other soffits may follow the ceiling-plastering items." Canopy undersides thus belong to the ceiling caliber.
2. Painting follows position — 4.14.10: "Ceiling putty, paint, and oil follow 4.15.1-4.15.10." Painting items are tabled by position: exterior wall (A.14.3-1.1), interior wall (A.14.3-1.2), ceiling surface (A.14.3-2); canopy undersides match ceiling items such as A-14-118 "ceiling paint, emulsion, two coats" (m2; work: substrate cleaning, spraying/brushing). Beijing 2021 edition has the same structure (14-118).
3. Why misapplied: canopies are outdoors, intuition says "exterior"; but items split by painted position (wall/ceiling), not indoor/outdoor: overhead work and scaffold conditions match ceilings.
4. Three boundaries (all DB11/T 2382-2024):
   • Exposed canopy side faces and parapet flips: exterior-wall paint calibers;
   • Outdoor walls under the canopy are exterior walls anyway: exterior-wall paint;
   • 4.15.6: "Single painted areas <= 0.50 m2 follow miscellaneous-item paint"; 4.15.8: "Painted and sprayed areas are computed per design-shown dimensions."
5. Consistent regional parallels: Shaanxi's new draft (2024): "for balconies and canopies projecting from exterior walls, soffit plastering is computed on horizontal projection of the exterior-face dimensions and executes ceiling-plastering items; cantilever beam soffits merge into the balcony/canopy area"; railway TB/T 10831-2024 splits interior paint by "wall/ceiling" (FY-1791 wall, FY-1793 ceiling; ceiling bands cost more than wall bands) — canopy soffits likewise take the ceiling band.

Applicable Boundaries

• Applies to Beijing building and decoration works (DB11/T 2382-2024) and other regions/sectors following the same position-based split; specific item numbers, coefficients, and work contents per the local current pricing basis (Shaanxi is a draft; railway numbering differs).
• Only for upward-facing soffits; exposed vertical faces/flips and sheltered outdoor walls take exterior-wall calibers; indoor walls take interior-wall calibers.
• Single areas <= 0.50 m2 follow miscellaneous paint; quantities per design dimensions.
• Local calculation rules (developed area/horizontal projection, deduction thresholds) differ — check them together.
• This card is an item-application interpretation, not a project pricing conclusion.

Further Reading

• DB11/T 2382-2024 Sections 4.14 (4.14.2, 4.14.10, 4.14.11) and 4.15 (4.15.6, 4.15.8); Annex A.14 (A.14.3-2, item A-14-118).
• Shaanxi new consumption quota (2024 draft) ceiling-plastering rules.
• TB/T 10831-2024 Vol. 10, Chapter 2 Section 5 paint works, FY-1791~FY-1811.
• Beijing 2021 edition ceiling paint items (14-118).