SCOPE ANALYSIS REPORT
Project: Central Plaza Office Tower – Tenant Improvement Floors 8-12
Trade: Division 21 – Fire Suppression
Spec Sections Analyzed: 21 13 00, 21 13 13, 21 13 16
Analysis Date: November 10, 2025
Generated by: SpecFinder 1.0
PROJECT OVERVIEW
This analysis covers fire suppression scope for Central Plaza Office Tower Tenant Improvement, a 5-floor office build-out (floors 8-12) requiring complete wet-pipe sprinkler system installation. The project includes new sprinkler risers, seismic bracing, concealed sprinkler heads in T-bar ceilings, and coordination with HVAC ductwork, lighting, and structural elements. The building is fully occupied below and above the work area, requiring phased installation and hot-tie connections to the existing system.
SCOPE SUMMARY
Your Division 21 scope includes:
- Complete wet-pipe sprinkler system (5 floors, approximately 85,000 SF total)
- 2 new sprinkler risers (8″ steel pipe from basement to 12th floor)
- Zone control valves and flow switches (one per floor)
- Seismic bracing per ASCE 7 (longitudinal and lateral restraints)
- Concealed sprinkler heads in acoustical ceilings (white finish, quick-response)
- Fire pump coordination (existing pump capacity verification required)
- Hydraulic calculations and submittal (full system design with NFPA 13 compliance)
MATERIALS & QUANTITIES
Pipe & Fittings
Main risers (8″ Schedule 40 steel): 240 linear feet
- Grooved-end connections throughout
- Seismic bracing at maximum 40′ intervals per ASCE 7-16
Branch lines (2″ Schedule 10 steel): 4,800 linear feet
- Black steel pipe, threaded connections for heads
- Painted per spec (red oxide primer + finish coat)
Drop lines (1″ Schedule 10 steel): 1,200 linear feet
- From branch lines to individual heads
- Armored flex drops in areas with seismic requirements
Fittings: Grooved elbows, tees, couplings, reducers (estimated 650 units)
Sprinkler Heads
Concealed pendent heads (quick-response, 155°F): 420 units
- White finish, recessed escutcheon plates
- Standard coverage (130 SF per head)
- FLAG: Spec requires “chrome” finish in restrooms and break rooms (32 heads)
Upright heads (for above-ceiling plenum spaces): 85 units
- Standard response, 155°F, chrome finish
Control Valves & Devices
Butterfly control valves (OS&Y type): 5 units (one per floor)
- Grooved connections, UL/FM approved
- Tamper switches and supervisory connections
Flow switches (paddle-type): 5 units
- Wired to fire alarm system (coordinate with Division 28)
Pressure gauges: 10 units (upstream/downstream of each control valve)
Test & drain connections: 5 units (one per floor)
Seismic Bracing
Longitudinal bracing assemblies: 68 units
- Maximum 40′ spacing on main lines per ASCE 7-16
- Attached to structural deck or beams (verify attachment points)
Lateral bracing assemblies: 68 units
- Four-way bracing at direction changes and tees
- COORDINATION REQUIRED: Structural engineer approval for attachment loads
Fire Pump Coordination
Existing fire pump capacity: 750 GPM @ 125 PSI
- ACTION REQUIRED: Verify pump can handle additional 5-floor load
- Hydraulic calculations will determine if pump upgrade needed
KEY REQUIREMENTS
NFPA 13 Compliance
- Light Hazard Occupancy: Office spaces (0.10 GPM/SF design density)
- Design Area: 1,500 SF most remote area
- Head Spacing: Maximum 15′ x 15′ coverage (130 SF per head)
- Hydraulic Calculations Required: Full system analysis from most remote head to water supply
Seismic Requirements (ASCE 7-16)
- Seismic Design Category D (per structural drawings)
- Longitudinal bracing: Every 40′ on branch lines 2″ and larger
- Lateral bracing: Every 80′ on branch lines, every direction change
- Four-way bracing: At cross mains and major tees
- Flexible couplings: Required within 24″ of building separation joints
Ceiling Coordination
- Acoustical T-bar ceilings: 2′ x 2′ grid throughout
- Concealed heads: Require precise coordination with ceiling grid layout
- Minimum clearance: 18″ from sprinkler head to top of ceiling tile (per NFPA 13)
- FLAG: Some heads may need to be relocated if HVAC diffusers conflict (coordinate during layout)
Hot-Tie Connections
- Building remains occupied during construction
- Hot-tie procedure required: Connect new risers to existing system under pressure
- Owner approval required: Schedule hot-tie work during off-hours (evenings/weekends)
- Temporary impairment: Notify building fire marshal 48 hours in advance
SUBMITTAL REQUIREMENTS
Hydraulic Calculations
(Required 12 weeks before installation)
- Full system analysis per NFPA 13
- Most remote area calculation (1,500 SF design area)
- Pump curve verification (existing fire pump capacity)
- Water supply test results (coordinate with owner/city for flow test)
- FLAG: Architect review typically takes 30 days for hydraulic calcs – submit early
Shop Drawings
(Required 10 weeks before installation)
- Sprinkler layout drawings (coordinated with reflected ceiling plans)
- Riser diagrams (valve locations, pipe sizing, flow switches)
- Seismic bracing details (attachment methods, load calculations)
- Coordination drawings (showing conflicts with HVAC, lighting, structure)
Product Data
(Required 8 weeks before installation)
- Sprinkler head specifications (manufacturer cut sheets, UL listings)
- Pipe and fittings (manufacturer certifications, material specs)
- Valves and devices (control valves, flow switches, tamper switches)
- Seismic bracing systems (manufacturer load ratings, installation instructions)
Certifications
(Required before final inspection)
- Contractor’s Material & Test Certificate (NFPA 13 Appendix C)
- Hydrostatic test results (200 PSI for 2 hours, no leaks)
- Flush test results (water velocity and clarity per NFPA 13)
- Final acceptance test (flow test at inspector’s test connection)
COORDINATION RISKS
🚨 HIGH PRIORITY
1. Fire Pump Capacity Verification (Division 21 / Owner / City)
- Issue: Existing fire pump rated at 750 GPM. Adding 5 floors may exceed capacity.
- Risk: If hydraulic calcs show insufficient flow, pump upgrade required (not in budget)
- Action Required: Obtain water supply test results and verify pump curve BEFORE bidding
- Typical Resolution: If pump upgrade needed, submit change order or value-engineer head spacing
2. Seismic Bracing Structural Attachments (Division 21 / 05)
- Issue: Seismic bracing requires attachment to structural deck or beams with specific load ratings
- Risk: Structural engineer may require additional reinforcement or attachment methods not in original design
- Action Required: Submit seismic bracing shop drawings to structural engineer for approval during submittal phase
- Lead Time Impact: Structural review can add 2-3 weeks to approval timeline
3. Hot-Tie Connections to Existing System (Division 21 / Owner / Fire Marshal)
- Issue: Building remains occupied; hot-tie work requires system shutdown and fire watch
- Risk: Owner may restrict work hours or require additional safety measures (increasing labor costs)
- Action Required: Confirm hot-tie procedure and schedule restrictions with owner BEFORE bidding
- Cost Impact: Weekend/after-hours work can add 20-30% to labor costs
⚠️ MEDIUM PRIORITY
4. HVAC Duct and Sprinkler Head Conflicts (Division 21 / 23)
- Issue: Concealed sprinkler heads require precise spacing; HVAC ducts may interfere
- Risk: Head relocations required after ceiling layout, causing rework and delays
- Action Required: Coordinate sprinkler layout with HVAC shop drawings before rough-in
- Schedule Impact: Conflicts discovered late can delay ceiling installation by 1-2 weeks
5. Fire Alarm Integration (Division 21 / 28)
- Issue: Flow switches and tamper switches must be wired to building fire alarm panel
- Risk: Scope gap on who provides wiring, conduit, and panel programming
- Action Required: Clarify Division 21 vs. Division 28 responsibilities for wiring and connections
- Typical Resolution: Division 21 provides devices, Division 28 provides wiring and integration
6. Ceiling Grid Layout Coordination (Division 21 / 09)
- Issue: Concealed heads must align with 2′ x 2′ ceiling grid; grid layout not finalized
- Risk: Heads installed before grid layout finalized, causing misalignment and rework
- Action Required: Obtain final reflected ceiling plans before installing drop pipes
- Best Practice: Install branch lines first, wait for ceiling grid installation, then install drops
CODE COMPLIANCE NOTES
NFPA 13 (Sprinkler Installation)
- 7.2.1: Light Hazard occupancy design density 0.10 GPM/SF over 1,500 SF
- 9.3.5.1: Concealed heads require 18″ clearance above finished ceiling
- 16.11.5: Seismic protection required per ASCE 7 (Seismic Design Category D confirmed)
- 25.2: Hydrostatic test at 200 PSI for 2 hours (no pressure loss allowed)
ASCE 7-16 (Seismic Design)
- Chapter 13: Nonstructural components require seismic bracing
- Table 13.6-1: Sprinkler piping component importance factor Ip = 1.5
- 13.3.1: Bracing required for piping 2″ diameter and larger
- 13.6.7.2: Longitudinal bracing every 40′, lateral bracing every 80′
International Building Code (IBC)
- 903.2: Automatic sprinkler systems required in Group B occupancies over 5,000 SF per floor (compliant)
- 903.3.5: Fire department connections required (verify existing FDC serves new floors)
RECOMMENDED ACTIONS
Before Bidding:
- Obtain water supply test results: Verify city water pressure and flow at building
- Confirm fire pump capacity: Review existing pump curve and calculate if upgrade needed
- Clarify hot-tie restrictions: Confirm work hour restrictions and fire watch requirements with owner
- Submit RFI: Clarify Division 21 vs. Division 28 scope for flow switch wiring
After Contract Award:
- Start hydraulic calculations immediately: 12-week lead time for approval
- Coordinate with HVAC contractor: Obtain duct routing drawings before sprinkler layout
- Submit seismic bracing details to structural engineer: Verify attachment loads and methods
- Order long-lead items: Grooved valves and specialty fittings (6-8 week lead time)
During Construction:
- Install branch lines before ceiling grid: Avoid misalignment issues with concealed heads
- Schedule hot-tie work with owner: Minimum 48-hour notice to fire marshal required
- Perform hydrostatic test before ceiling closeout: 200 PSI for 2 hours, document results
ESTIMATED SCOPE VALUE
Materials: $145,000 – $165,000
Labor: $95,000 – $110,000
Testing & Certification: $8,000 – $12,000
Total Estimated Scope: $248,000 – $287,000
Note: Estimate assumes existing fire pump has adequate capacity. If pump upgrade required, add $75,000-$125,000. Hot-tie work during off-hours may add 20-30% to labor costs.
END OF REPORT