Architectural Roof & Modified Roofing Upgrade

This roof replacement in Snellville, GA restored full protection to the home using GAF Timberline HDZ architectural shingles in Slate. The project improved weather resistance, addressed existing leak concerns, and provided the homeowner with a durable, professionally installed roofing system designed for long-term performance.

Project Overview

Following storm exposure and age-related wear, the homeowner experienced declining roof performance, including compromised shingles, deteriorated flashing, and areas of wood rot along fascia and soffit sections. An inspection confirmed the need for a full roof replacement, upgraded leak protection, and targeted carpentry repairs. In addition, a low-slope rear porch area required a modified bitumen roofing system to ensure proper waterproofing and drainage. The existing roof system no longer provided dependable protection against Snellville’s frequent rain and severe weather, making a comprehensive solution necessary.

Results

The completed roofing system delivered immediate improvements in protection, durability, and overall functionality. GAF Timberline HDZ architectural shingles in Slate were installed to provide enhanced wind resistance and long-term performance. Leak barriers were added at valleys, penetrations, chimneys, and other vulnerable areas, while new step flashing, counter flashing, and pipe boots ensured proper water shedding throughout the roof system.

The rear porch received a torch-applied modified bitumen roofing system installed over existing decking, providing a seamless and watertight low-slope solution. Ventilation was improved with the installation of a full ridge vent system, supporting balanced airflow across the roof. Carpentry repairs addressed damaged fascia, rake trim, soffit, and bird boxes using durable replacement materials, followed by sealing and painting for a clean, finished appearance. With installation completed to manufacturer standards, the homeowner now has a secure, weather-resistant roofing system built to perform through future storms.

Materials Used

Roofing

• GAF Timberline HDZ architectural shingles – Slate

• GAF Seal-A-Ridge hip & ridge cap – Slate

Underlayment & Protection

• Tri-Built synthetic underlayment (3 rolls)

• GAF StormGuard ice & water shield (1 roll)

Low-Slope Roofing System

• Torch-applied modified bitumen cap sheet (7 rolls)

• Torch-applied smooth sheet (7 rolls)

• Glass base sheet (2 rolls)

Starter & Edge Protection

• Tri-Built starter shingles (3 bundles)

• Drip edge – 10" x 4" x 2" white (rakes) (24 pcs)

Ventilation & Accessories

• GAF Cobra III ridge vent (19 pcs)

• 7" gooseneck exhaust vent – Black (1 vent)

• 3-in-1 pipe boots with rain collars – Black (4 boots)

• HVAC cap, collar, and flashing kit (1 kit)

Flashing & Metals

• Rolled flashing – 25' galvanized (24" wide) (1 roll)

• Step flashing – galvanized 2" x 4" x 8" (2 boxes)

• Counter flashing – 5" black (2 pcs)

Decking & Lumber

• 7/16" OSB decking (15 boards)

• 1x8 Hardie trim board (fascia)

• 1x10 Hardie trim board (bird boxes)

• 3/8" BC plywood (soffit and bird box repairs)

Fasteners & Sealants

• Simplex nails – 1-1/4" (1 box)

• Galvanized nail coils – 1-1/4" (2 boxes)

• Stinger NailPac (2 boxes)

• NP1 sealant – Black (4 tubes)

• Asphalt primer (2 cans)

Finishes

• Black spray paint (2 cans)

• Exterior semi-gloss white paint