Old Torch Roof to Modern TPO — Roof Upgrade Project

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Golem Roofing completed a torch-down to TPO upgrade with low-slope roof restoration project in Los Angeles, CA. TPO roofing, drainage, flashing, and penetrations must work as an integrated waterproofing system. A properly installed TPO roof can provide long-term waterproofing performance when the deck, seams, drains, and edge details are rebuilt correctly. The smartest approach is to install (or replace) the roof first, then schedule rooftop equipment work — so both systems age together. When rooftop equipment is mounted on an aging roof, the homeowner eventually has to pay for panel removal and reinstallation just to replace the roof underneath. Proper flashing at every roofing mount point is critical — most roofing-related roof leaks are caused by improper penetration sealing.

Roofing Panels and Roofing — How They Work Together

25–30 Years
Roofing Panel Lifespan
25–50 Years
New Roof Lifespan
Roof First
Recommended Order
Proper Flashing
Leak Prevention

Roofing Panels and Roofing — How They Work Together

TPO roofing, drainage, flashing, and penetrations must work as an integrated waterproofing system. A properly installed TPO roof can provide long-term waterproofing performance when the deck, seams, drains, and edge details are rebuilt correctly. The smartest approach is to install (or replace) the roof first, then schedule rooftop equipment work — so both systems age together. When rooftop equipment is mounted on an aging roof, the homeowner eventually has to pay for panel removal and reinstallation just to replace the roof underneath. Proper flashing at every roofing mount point is critical — most roofing-related roof leaks are caused by improper penetration sealing.

Roofing + Roof Best Practices
  • Roof First, Roofing Second: If your roof is more than 10 years old, replace it before installing roofing. This avoids costly panel removal later
  • Flashing at Every Mount: Every lag bolt penetration needs a dedicated flashing boot and sealant — not just caulk over the bolt head
  • Coordinate Teams: Ideally, the roofing contractor and roofing installer should coordinate before work begins so mounting locations are pre-flashed during roof installation
  • Panel Cleaning: During removal and reinstallation, panels should be cleaned to restore optimal power output

Frequently Asked Questions

Should I replace my roof before installing roof-mounted equipments?

If your roof is more than 10 years old, yes — replace it first. Roof-mounted equipments last 25–30 years, and removing them mid-life for a roof replacement adds significant cost. The most economical approach is new roof → roof-mounted equipments so both systems age together.

How much does roof-mounted equipment removal and reinstallation cost?

Cost depends on the number of panels and system complexity. The process includes electrical disconnection, safe removal, on-site storage during roof work, panel cleaning, and reinstallation with new flashing and sealant at every mount point. Getting both services from one contractor simplifies coordination and accountability.

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