A Castle Rock retail property owner called us when his 18-year-old built-up roof started leaking into tenant spaces. With three active retail tenants and a busy weekend ahead, the project had to be scheduled and completed with zero disruption to business operations. Here's how it went.
- Location
- Castle Rock, CO 80104 — Douglas County
- Property Type
- Multi-tenant retail, 14,000 sq ft flat roof
- Tenants Active
- 3 retail businesses, all open during install
- Service
- Full commercial roof replacement (BUR removal + TPO install)
- Materials
- 60-mil TPO single-ply, tapered ISO insulation, fully-adhered
- Timeline
- 6 working days, zero tenant disruption
- Warranty
- 20-year manufacturer + 5-year workmanship
The Challenge
The existing built-up roof (BUR) was leaking in three locations into tenant spaces. The owner needed a permanent solution — but the building had to stay fully operational throughout. Any interior water intrusion during the project would mean closed tenants and lost rent.
Existing 18-year-old built-up roof showing failure at the seams
The Solution
We specified a complete tear-off and replacement with 60-mil TPO single-ply membrane over new tapered ISO insulation. TPO is the current standard for commercial flat roofs in Colorado — heat-welded seams (no adhesive failures over time), excellent UV resistance, energy-efficient white reflective surface, and 20-year manufacturer warranty.
- Tapered insulation to create positive drainage to existing drains and scuppers
- Cover board over insulation for puncture resistance
- 60-mil TPO fully-adhered (mechanical fastening would have transmitted vibration into tenant spaces)
- Heat-welded seams tested for waterproof integrity
- New parapet wall flashing and counter-flashing
- Detail work at every penetration — HVAC curbs, vents, drains, scuppers
The Schedule
We staged the project in 4 sections, never leaving more than one section exposed overnight. Weather windows were planned with 3-day forecast confidence. Tear-off and replacement of each section happened the same day — meaning each tenant was always protected by either old roof or new roof, never an open hole.
tear-off section 1
insulation + cover board
TPO heat-weld in progress
Crew arrived at 7am each morning and was off the roof by 5pm. No after-hours work, no weekend disruption, no interior leaks, no tenant complaints.
The Outcome
Project completed on day 6, on budget, with zero tenant disruption. The new roof carries a 20-year manufacturer warranty plus our 5-year workmanship warranty — and a comprehensive 10-year maintenance plan that includes annual inspections and minor repairs.
The owner has since referred us to two other commercial property owners in Castle Rock — both of whom we're now working with on similar projects.
The fact that they pulled this off without disrupting any of my tenants was the win. Other bidders wanted to close tenants for the project. Force 5 staged it section by section and kept everyone open and dry through the whole thing.— Castle Rock commercial property owner
Commercial Roofing Done Right
Commercial roofing is a different game than residential — more stakeholders, more constraints, less margin for error. If you own commercial property in Denver Metro and need a roof done by people who treat your tenants and business as carefully as the work itself, give us a call.
