Jali Work — Perforated Stone Lattice Conservation

Conservation of Jali (jaali) — the Mughal tradition of perforated stone lattice screens combining ventilation, privacy, light filtering, and geometric art.

What Is Jali Work?

Jali (Urdu: جالی, "net" / "lattice") refers to perforated stone screens — typically carved from a single slab of marble, sandstone, or limestone. Jalis serve multiple functions:

Ventilation — passive cooling through air flow
Privacy — allows one-way visibility (purdah for women's quarters)
Light filtering — diffuses harsh sunlight
Geometric art — interlocking stars, octagons, hexagons, floral motifs
Climate control — works with traditional architecture for natural cooling

Notable Pakistani examples: Lahore Fort, Jahangir's Tomb, Sheikhupura Fort, Salimgarh, Wazir Khan Mosque windows.

Deterioration of Jali Work

Crack propagation — thin sections of jali make crack development serious
Soluble salt damage — pushes stone surface off, weakens carved patterns
Air pollution — modern industrial pollution accelerates stone decay
Vandalism + theft — entire panels stolen, especially marble jalis
Past cement repairs — incompatible material, accelerates damage
Structural settling — overall building movement stresses thin lattice members

Conservation Approach

3D documentation — photogrammetry, laser scanning where budget allows
Stone analysis — petrographic + salt analysis
Gentle cleaning — soft brushes, distilled water, never acid
Crack stabilization — stainless steel pins, mineral-based mortars
Lacuna filling — lime mortar tinted to approximate stone color
Selective replacement — only when fragments are missing + lost. Use compatible stone from same region. Carving by traditional masons
Stone consolidation — minimal intervention with proven products (ethyl silicate)
Protective measures — drainage improvements to prevent water/salt cycling

FAQs

Can missing jali sections be recreated?

Yes. Traditional stone carvers in Lahore + Multan can replicate jali patterns using historical drawings/photos. New panels marked subtly per ICOMOS authenticity rules.

Marble vs sandstone jali — different methods?

Yes. Marble more brittle, harder to consolidate. Sandstone more porous, more vulnerable to salt damage. Each requires specific approach.

How much does jali conservation cost?

Highly variable. Single small panel: Rs 1-3 Lac. Major monument with extensive jali (e.g., Jahangir's Tomb screen restoration): Rs 50 Lac - 2 Crore over multi-year program.