Existing Flat Roof Reparation in the Bronx
RH Renovation NYC completed a comprehensive low-slope flat roof reparation and waterproofing restoration project featuring damaged membrane excision, structural subdeck remediation, high-density cover board installation, and heavy-duty Firestone APP/SBS 180 (Elevate) cap sheet layer laydown for a property located in The Bronx, NYC. Densely built multi-family and commercial structures across The Bronx are continuously subjected to severe regional microclimatic pressures—including intense thermal shock from direct summer sunlight, heavy driving rains from seasonal nor’easters, severe urban wind-shear, and recurring winter freeze-thaw cycles.
When an existing flat roof system suffers localized punctures, split seams, or surface degradation, trapped stormwater exerts continuous hydrostatic pressure on the underlying roofing assembly. Left unaddressed, water saturates interior thermal insulation, rots timber or metal decking, and leads to costly ceiling leaks and interior structural damage. This project was engineered to systematically strip away compromised roofing sections, rebuild the structural subdeck, and deploy a reinforced, commercial-grade Firestone 180 modified bitumen cap sheet assembly built for exceptional puncture resistance, flexibility, and long-term weatherproofing.
Comprehensive Scope of Work & Installation Methodology
To adhere strictly to New York City Department of Buildings (DOB) safety and commercial roofing code standards, our licensed and insured Bronx flat roofing specialists executed a multi-phase technical installation protocol:
Diagnostic Audit & Targeted Substrate Excision: Technicians conducted a thorough diagnostic inspection across the entire roof plane to identify water-saturated insulation and deteriorated membrane sections. All damaged, split, or blistered material was systematically cut away down to the bare structural deck.
Structural Subdeck Remediation: Compromised deck sections were repaired and reinforced using heavy-duty, grade-stamped CDX sheathing panels to restore a flat, solid, and structurally sound foundation.
High-Density Insulation Cover Board Laydown: Replacement high-R-value polyisocyanurate (ISO) insulation and high-density cover boards were mechanically anchored across the repaired field. This step restores the continuous thermal envelope, eliminates surface irregularities, and provides a stable substrate for membrane adhesion.
Firestone (Elevate) 180 Black Layer Membrane Application: A heavy-duty Firestone 180 polyester-reinforced SBS/APP modified bitumen membrane layer was installed across the prepared roof deck. The membrane was systematically rolled, torch-applied/adhered with precision temperature control, ensuring complete compound bleed-out along all field laps to form a monolithic, highly elastic, puncture-resistant waterproof barrier.
Parapet Wall, Scupper & Penetration Flashing Details: High-risk transition zones—including masonry parapet walls, roof drains, scuppers, skylight curb bases, and plumbing vent stacks—were wrapped with reinforced membrane flashing, anchored with heavy-gauge metal termination bars, and sealed with high-performance non-sag polyurethane sealants.
Final Quality Control & Seam Inspection: A multi-point seam probe and water-flow test were performed to verify complete lap fusion, edge termination security, and unobstructed fluid drainage off the roof deck, followed by a thorough site cleanup.
Project Highlights & Technical Specifications
Service Category: Commercial & Residential Low-Slope Flat Roof Reparation & Modified Bitumen Waterproofing
Project Location: The Bronx, New York, NY
Core Materials Used: Structural CDX plywood sheathing, Firestone (Elevate) 180 polyester-reinforced modified bitumen membrane (black layer), high-R-value rigid polyisocyanurate insulation boards, heavy-gauge metal termination bars, and non-sag polyurethane sealants.
Key Engineering Focus: Hydrostatic water intrusion defense, high-tensile puncture resistance, urban wind-shear defense, thermal contraction/expansion accommodation, and NYC DOB code compliance.
Results & Property Owner Value
By performing targeted substrate repairs and installing a premium Firestone 180 modified bitumen cap layer, RH Renovation NYC permanently resolved the property’s leak vulnerabilities. The Bronx property owner now benefits from a robust, weather-tight, and energy-efficient flat roof assembly built to withstand severe regional weather while extending the overall service life of the building.
