Queens Roof, Parapet, Windows & Exterior Masonry Rehabilitation P.S. 221
Work
client New York City School Construction Authority (NYCSCA)
location 57-40 Marathon Parkway, Queens, NY 11362
Contractor ARMY CONSTRUCTION LLC
Performance Period 820 Calendar Days
Queens Roof, Parapet, Windows & Exterior Masonry Rehabilitation P.S. 221
The Public School 221 Queens project is a full-scale
building-envelope restoration addressing the school's aging roof, parapets,
masonry, and window systems.
ARMY CONSTRUCTION LLC executed the work in compliance with NYCSCA standards,
combining structural rehabilitation, waterproofing technology, and aesthetic
renewal to extend the building's service life while maintaining its mid-century
architectural character.
Scope of Work
1. Sitework & Exterior Improvements
Removal of damaged concrete pavements and aggregate base; installation of new **reinforced concrete sidewalk slabs** with positive drainage slopes.
Tree-protection and trimming performed by a **certified arborist**; reinstatement of landscaping with new sod and evergreen shrubs.
2. Concrete & Structural Repairs
**Canopy Rehabilitation:** Removal of loose and deteriorated concrete at entry canopies; patching with structural repair mortar.
**Fill & Screed Repair:** Excavation and replacement of cracked fill/screed to restore slope and integrity of the roofing substrate.
**Soffit Repair:** Routing and sealing of structural cracks under lunchroom slab with modified repair mortar.
3. Masonry Restoration & Terra Cotta
**Parapet Reconstruction:** Demolition down to roof deck; steel cleaning and priming; full rebuild with expansion joints and overflow scuppers.
**Terra Cotta Restoration:** Re-clad ceramic glazed terra-cotta columns and repoint columns using compatible mortar.
**Stone & Coping Work:** Replace granite curb stones under main-entrance guardrail and clean limestone sills and coping stones.
4. Roof Replacement & Waterproofing
**Roof Assembly Removal:** Strip all roof layers to solid fill/screed.
**New Roofing Systems:**
**Cold-Applied SBS Modified Bitumen** roof.
**Fluid-Applied Membrane Roofing** for selective zones.
Full repair of screed, vapor barrier, and insulation installation.
**Flashings & Drainage:** New **stainless-steel and liquid-applied flashings**, overflow scuppers, and vent base flashings.
5. Metal Work & Roof Safety Systems
**Access Ladders:** Install new **galvanized steel ladder** and replace damaged chimney rungs and handles.
**Roof Barrier Systems:** Provide parapet-mounted and slab-mounted **roof railings**.
**Cap Flashings:** Install two-piece **stainless-steel cap flashings**.
6. Sealants & Expansion Control
Replace all perimeter, control, and **expansion-joint sealants**.
New compressed joint fillers at building corners, pavement joints, and parapets to restore weather-tightness.
7. Windows, Doors & Guards
**Bulkhead Doors:** Replace with new **fire-rated steel doors and frames**.
**Window Guards:** Remove and replace exterior guards, modify select guards to accommodate AC units and awning operation.
Patch masonry penetrations and install new anchors per specifications.
8. Interior Finishes & Coatings
**Plaster Repair:** Wall and ceiling restoration in stair bulkheads.
**Ceiling Tiles:** Replacement of damaged tiles to match existing.
**Paint & Coating:** Repaint steel lintels and angles with rust-inhibitive primer. Apply **anti-graffiti coating** on above grade. Paint walls and ceilings.
**Spandrel Panels:** Clean, seal, and repaint porcelain-enamel steel spandrels at curtain walls, including sealant replacement.
Key Materials & Manufacturers
System
Product / Manufacturer
Roofing Assemblies
Cold-Applied SBS Modified System
Flashings & Metal Work
26 ga Stainless Steel / **20 oz Copper**
Masonry Units & Mortar
**Glen-Gery Brick** / Type N Mortar
Repair Mortar
**Sika / MAPEI** Structural Repair Systems
Ladders & Barriers
Custom **Galvanized Steel Assemblies**
Doors & Frames
**Steel craft** Fire-Rated Systems
Coatings
**Sherwin-Williams / Tnemec** Anti-Graffiti Systems
Project Highlights
Full Envelope Rehab:
Full envelope rehabilitation covering roof, parapets, masonry faades, and windows.
Modern Roofing:
Integration of modern **cold-applied and fluid-applied roofing technologies**.
Architectural Authenticity:
Restoration of **terra cotta columns** and limestone details for architectural authenticity.
Weather Protection:
Complete sealant replacement and **anti-graffiti protection** across faades.
Safety Enhancements:
Enhanced safety with new roof rail systems and access ladders.
Result
The P.S. 221 Queens Restoration Project revitalized a key NYC public school facility, delivering a watertight, structurally sound, and **architecturally restored building envelope**.
Through expert craftsmanship and close coordination with the NYCSCA design team, ARMY CONSTRUCTION LLC ensured that every elementfrom **terra cotta repointing** to roof installationmet stringent performance and aesthetic standards, extending the school’s service life for decades.
Subscribe to our newsletter today!
Don't miss out on the latest in architecture and design