Large beige house with a turret and dark roof, under a cloudy blue sky. A car is in the driveway.

GAF Shingle and EPDM Roof Replacement

This Lancaster home needed more than a basic shingle replacement. Our inspection found loose shingles, visible nail pops, heavy organic growth, and an aging low-slope EPDM roof with deteriorated edges. These issues created several possible entry points for water and showed that multiple areas of the roofing system were approaching the end of their useful life.


After removing the existing roofing materials, we installed 7/16-inch OSB over the existing board roof deck to create a stronger, more consistent surface. The steep-slope portions received a complete GAF Timberline Natural Shadow roofing system, while the low-slope area was replaced with an EPDM rubber roofing system appropriate for that section’s pitch.


The project also included upgraded GAF Deck-Armor roof-deck protection, ice and water underlayment, new starter and ridge-cap shingles, pipe flashings, and new aluminum chimney and counter flashing.

Location: Lancaster, Lancaster County

Project Type: Roof Replacement

Project Scope: Removal of the existing roofing materials; installation of OSB over the existing board deck; new GAF asphalt shingle system; EPDM replacement on the low-slope roof; and updated chimney, counter, step, headwall, and pipe flashing

Key Features:

GAF Timberline Natural Shadow shingles, GAF Deck-Armor roof-deck protection, TopShield ice and water underlayment, GAF Pro-Start starter shingles, Seal-A-Ridge caps, new EPDM low-slope roofing, 7/16-inch OSB sheathing, Lifetime pipe flashings, and new aluminum chimney flashing

What We Delivered

What we delivered was a roofing system built around the different needs of each section of the home. The steep-slope areas received architectural shingles and coordinated GAF system components, while the flatter section was protected with EPDM rubber roofing instead of shingles that were not suited for the lower pitch.



Installing new OSB over the existing board deck created a more consistent base for the roofing system. New underlayment, leak protection, pipe flashings, and chimney flashing strengthened several of the roof’s most vulnerable areas. The result is a cleaner, more cohesive exterior with the right roofing material used on each slope and better protection where the different roof sections meet.