01 · DECK
Start with a sound substrate
Tear-off can expose deterioration that was not visible from the surface. Damaged decking or framing must be documented and resolved before it is concealed by new roofing layers.
GAF roof-system planning · real Kellets field work
A roof is a system—not just shingles.
See how deck condition, leak protection, underlayment, starter strips, shingles, ventilation, ridge caps, flashing, and workmanship must work together on a replacement roof.
Direct answer
What makes a complete GAF roofing system?
GAF identifies seven coordinated categories: leak barrier, roof-deck protection, starter-strip shingles, field shingles, attic ventilation, rooftop accessories, and ridge-cap shingles. The exact products and details depend on roof geometry, ventilation, climate exposure, code requirements, and the conditions uncovered during removal.
System-first planning
Four decisions that shape the finished roof.
All media on this page comes from Kellets project work. Product selections vary by property; photographs document field conditions and sequencing rather than promising a particular product for every roof.
02 · WATER CONTROL
Plan leak barriers and underlayment
Valleys, eaves, penetrations, sidewalls, and transitions deserve deliberate detailing. Roof-deck protection helps shield the deck; leak barriers address vulnerable water-entry zones.
03 · SHINGLE FIELD
Coordinate starter, shingles, and ridge caps
Starter strips protect roof edges, field shingles create the primary weathering surface, and ridge caps finish hips and ridges. Layout and fastening must follow the selected product instructions.
04 · TRANSITIONS
Make every roof condition work together
Chimneys, skylights, wall intersections, retained materials, low-slope sections, metal roofs, and future solar work can turn a simple replacement into a coordination project.
Warranty literacy
Choose the assembly and warranty together.
Warranty names can sound similar while eligibility and coverage differ. Ask for the exact warranty document, qualifying products, contractor requirements, registration responsibility, exclusions, transfer rules, and workmanship terms before work begins.
System eligibility matters
GAF states that enhanced warranty eligibility depends on the contractor’s current certification level and use of qualifying GAF accessories. Do not rely on a verbal label alone—confirm the exact warranty available for the proposed assembly.
Product details matter
Timberline HDZ® is an architectural shingle. Certain wind and algae-protection terms require qualifying products and installation conditions; the controlling warranty and product documents govern.
Kellets is an independent contractor. This page provides planning guidance and does not replace GAF’s current product instructions, warranty documents, code requirements, or project-specific professional review. Ask Kellets to document the certification tier and enhanced-warranty options applicable at contract time.
Brooklyn case study
What to Expect When You’re Expecting a Roof Replacement
This home combined a new pitched asphalt-shingle roof, standing-seam metal, a low-slope membrane assembly, and transitions to a retained existing clay-tile roof. Tear-off also exposed major structural conditions that had to be addressed before the new roof systems could continue.
Homeowner Q&A
Questions to resolve before replacement.
Good roofing decisions begin with the conditions, not a one-line price per square.
Is a GAF roof just Timberline shingles?
No. GAF describes a coordinated roof system that can include leak barrier, roof-deck protection, starter strips, shingles, ventilation, accessories, and ridge caps. The selected assembly should match the property.
Can every contractor offer every GAF enhanced warranty?
No. GAF ties enhanced-warranty availability to the contractor’s current certification tier and qualifying system components. Request written confirmation for the warranty proposed on your project.
What happens if damaged decking or framing is found?
The work should pause long enough to document the condition, define the required response, communicate cost and schedule implications, and restore a suitable base before roofing layers conceal the area.
How should skylights, chimneys, walls, and mixed roof slopes be handled?
They should be treated as coordinated transition details. Material compatibility, flashing sequence, drainage path, and manufacturer instructions matter more than applying a generic detail everywhere.
Can solar be coordinated with a roof replacement?
Yes. Roof age, deck condition, attachment strategy, penetrations, array location, access, and electrical routing should be coordinated early so completed roofing does not need avoidable rework.
Planning a roof replacement?
Bring us the leaks, slopes, transitions, and solar plans.
Kellets will help organize the questions, field conditions, system choices, documentation, and next steps.