A. Pre-Work Inspection & Preparation • Conduct a thorough inspection of the existing TPO membrane for signs of wear, punctures, or seam failures. The contractor is responsible for completing all work outlined in the Scope of Work for the agreed-upon price. The quoted price shall encompass all labor, materials, equipment, and services necessary to fulfill the contract requirements without additional cost to the Navajo Nation Facilities Maintenance Department (FMD), unless otherwise approved in writing. • Identify and document areas requiring major repairs. • Clear the roof surface of debris, dirt, and contaminants using a blower or power washer (as needed). • Ensure the surface is dry and free of moisture before proceeding. • Replace all damaged or compromised TPO sections with like material. • Ensure positive drainages. B. Surface Preparation • Clean the existing membrane seams with an approved TPO cleaner. • Lightly abrade areas needing resealing to enhance adhesion. • Apply TPO primer to ensure proper bonding (if required by manufacturer guidelines). C. Resealing Process • Re-weld loose or failing seams using a hot-air welder. • Apply TPO seam tape where necessary, ensuring full adhesion. • Seal minor punctures or damage with TPO-compatible liquid sealant or flashing material. • Conduct a final pass with a roller to ensure seams are fully bonded. • Apply manufacturer-approved sealant material in strict accordance with the specified guidelines and recommendations. • Reseal all TPO roofing surfaces, including parapet walls, using a manufacturer-approved sealant at the recommended thickness to ensure long-term waterproofing and durability. • Properly seal all roofing penetrations, equipment pedestals, and walking surfaces. Replace and/or install designated walking pathways as needed to protect the TPO roofing membrane from foot traffic damage. D. Post-Work Inspection & Testing • Perform a seam probe test to confirm proper adhesion. • Conduct a water test if needed to check for leaks. • Inspect the entire roof to verify all problem areas have been addressed. • Upon final inspection and acceptance, the contractor shall provide a written 15-year guarantee covering both the materials used and the workmanship, ensuring protection against defects in materials and labor. • Premium/Manufacturer-Specific Warranties: Up to 15 years (for high-performance sealants) E. Cleanup & Final Documentation • Remove all tools, materials, and debris from the roof. • Provide a final report with photos and details of completed work. • Recommend ongoing maintenance or additional repairs if necessary.
