The constraint
Fulfillment tenant, could not close Monday through Friday. We had a Friday 6 pm to Sunday 10 pm window. Roof was 18 years old, foam intact, last recoat in 2019. Chalky top coat, one small delamination at an HVAC curb.
The plan
- Friday 5 pm: equipment on site, staging built
- Friday 6 pm to 10 pm: power-wash and detail cleaning, HVAC curb prep
- Saturday 6 am to 6 pm: first pass silicone at 12 mils, all penetrations detailed
- Sunday 6 am to 4 pm: second pass silicone at 13 mils, drain covers pulled and reset
- Sunday 6 pm to 10 pm: final walkthrough, drone photos, tenant notified
Materials
- GacoRoof S-2100 silicone, 25 dry mils applied in two coats
- GAF fabric reinforcement at 14 HVAC curbs
- Cured foam repair at 220 sq ft near the north curb
- New drain strainers on 6 roof drains
Production rate
6-person crew moved at roughly 1,100 sq ft per hour on the roll-and-spray combination. On a clean, dry, single-elevation roof we can push 1,400 to 1,600. Curbs and drains slow us down and are worth the detail time.
What it cost
$47,600 all in, including the localized foam repair and new drain strainers. On a per-sq-ft basis that landed at $2.16, right in the middle of our published Phoenix recoat range.
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