Project: Copper Chimney Flashing Installation Service

RH Renovation NYC completed a multi-system exterior envelope restoration featuring custom hand-bent copper step and counter-flashing installation, masonry chimney tuckpointing, and targeted asphalt shingle matrix repair for a residential home in The Bronx, NYC. Masonry chimneys projecting through steep-slope rooflines represent one of the most critical and high-risk waterproofing intersections on a residential structure. In urban Bronx environments, these roof transitions are subjected to extreme microclimatic forces—including severe winter freeze-thaw expansion, driving rains from seasonal nor’easters, high wind-shear gusts, and intense thermal cycling.

When legacy chimney flashings corrode, split, or dislodge from masonry mortar joints, wind-driven rain penetrates directly behind the roof deck, causing concealed rafter rot, ceiling drywall collapse, and attic insulation saturation. Furthermore, eroded chimney mortar joints absorb standing water, which expands during freezing temperatures and leads to spalling brickwork and internal masonry decay. This project was engineered to deliver a complete, long-term weatherproofing solution: repointing the compromised brick chimney, weaving new architectural shingles into the surrounding roof plane, and fabricating custom soldered copper step and counter-flashings to create an impenetrable, lifetime-rated fluid barrier.

Comprehensive Scope of Work & Installation Methodology

To satisfy strict New York City Department of Buildings (DOB) residential building safety codes and NFPA 211 chimney standards, our licensed and insured Bronx restoration specialists executed a multi-phase technical installation protocol:

• Masonry Joint Rake-Out & Tuckpointing: Technicians systematically raked out deteriorated, loose mortar joints along the brick chimney stack using specialized diamond-blade masonry tools. High-flexibility Type N exterior masonry mortar was firmly packed into cleaned joint voids and struck into a water-shedding concave profile to resist freeze-thaw spalling.

• Targeted Shingle Tear-Off & Subdeck Audit: Damaged, weathered, and lifted asphalt shingles surrounding the chimney perimeter were removed down to the timber roof subdeck. The exposed plywood was inspected, reinforced, and encapsulated with a continuous layer of rubberized self-adhering ice-and-water shield membrane.

• Custom Copper Step Flashing Integration: Heavy-gauge architectural solid copper step flashings were custom-bent on-site and interwoven course-by-course with new high-wind architectural dimensional shingles along the sides of the chimney stack, providing individual course drainage protection.

• Reglet Cutting & Copper Counter-Flashing Encapsulation: A horizontal reglet groove was precision-cut into the brick chimney mortar joints. Custom-formed copper counter-flashings were inserted deep into the reglet, overlapping the step flashings beneath. The joint was mechanically anchored with lead wedges and sealed with non-sag exterior polyurethane sealant.

• Soldered Copper Apron & Cricket Flashing Fitment: A custom copper apron flashing was fitted along the lower chimney face, and a rear copper cricket/saddle flashing was integrated along the high-side roof deck to divert downward water sheet-flow around the chimney corners. All metal-to-metal overlap seams were lead-free soldered for permanent seam fusion.

• Final Waterproofing Audit & Site Magnet Cleanup: A high-pressure water spray audit was conducted around all four faces of the chimney assembly to confirm zero water entry. A comprehensive magnetic sweep of the surrounding roof and grounds was completed to clear all metal debris.

Project Highlights & Technical Specifications

• Service Category: Architectural Copper Chimney Flashing Installation, Masonry Chimney Repointing & Roof Shingle Matrix Repair

• Project Location: The Bronx, New York, NY

• Core Materials Used: Heavy-gauge solid copper sheet stock, lead-free structural solder, Type N flexible masonry mortar, self-adhering rubberized ice-and-water shield membrane, architectural dimensional asphalt shingles, lead anchorage wedges, and UV-resistant exterior polyurethane sealants.

• Key Engineering Focus: Masonry-to-roof transition weatherproofing, freeze-thaw mortar spalling defense, custom hand-soldered metal seam fusion, water-shedding cricket geometry, and NYC DOB code compliance.

Results & Homeowner Value

By combining precision brick tuckpointing with custom hand-soldered copper step and counter-flashing details, RH Renovation NYC permanently protected the home’s most vulnerable roof transition. The Bronx homeowners now benefit from an aesthetically striking, lifetime-rated copper flashing assembly and a fully restored, weather-tight chimney structure engineered to endure severe regional weather for decades.