Our Proven, Step-by-Step Process (What We Do & Why It Matters)

When you hire Winchester Roofing, you’re getting a team that follows manufacturer-recommended methods at every stage—from deck prep and underlayment to flashing, shingles, and ventilation. 

​​

What to Expect: Our Step-by-Step Roof Replacement

​

1. Arrival, protection & tear-off - We protect landscaping, remove old roofing down to the deck, and haul away debris so we can inspect your roof structure properly​

2. Deck inspection & repairs - We verify your deck is an acceptable, solid substrate (e.g., plywood ≥ 3/8" or OSB ≥ 7/16") and correct any issues like wide gaps or damaged boards before installing new materials. Proper panel spacing and a smooth, fastener-friendly surface are critical for shingle performance and warranty compliance.​

3. Underlayment strategy (by slope & climate) - 

   1. Standard/steep slopes (≥4/12): We install code- and manufacturer-approved water-resistant synthetic underlayment (e.g., DiamondDeck®/RoofRunner™) to keep the deck dry and support the fire rating when required.

   2. Low slopes (≥2/12 and <4/12): We cover the entire deck with a self-adhered waterproofing shingle underlayment (WSU) (e.g., WinterGuard® or equivalent). This is required to reduce leak risk where water drains more slowly.  In high-risk areas, WSU is used even on higher slopes.

   3. The type of fastener and installation method used for the underlayment are determined by the manufacturer and directly affect the product warranty. For example, CertainTeed requires that synthetic underlayment be fastened to the roof decking with cap nails, while Owens Corning permits the use of staples.

4. Valleys, pipe boots & leak-prone areas - We line valleys with WSU before shingling to handle heavy water flow, and we follow preferred valley styles for your shingle system.   WSU is also installed on roof decking around all pipe boots, around chimneys, and any penetration points in the roof.

5. Drip edge, eaves & rakes - We install metal drip edge correctly—under underlayment at the rakes and over at the eaves for proper water-shedding—and fasten per modern code guidance.

6. Starter strip & first course - We use approved, manufactures starter shingles, sized and positioned to set the correct exposure and seal the eave line against wind-driven rain. We install the manufacturers starter shingles up the rake as well as the eave to qualify for the Wind Warranty Upgrade (130 MPH).

7. Field shingles (installation pattern & exposure) - We lay shingles per manufacturer spec (exposure, cut pattern) to avoid objectionable patterns and ensure reliable water shedding. Certain laminated shingles include installer-friendly features like NailTrak® and robust adhesive systems.

8. Fastening (nail type, count & placement) - We use corrosion-resistant roofing nails with the correct shank/head size and length, placed in the designated nailing zone —critical for performance and warranty.

9. Flashing (walls, chimneys, penetrations) - We replace or properly integrate step flashing (minimum dimensions and overlaps), counter-flashing, pipe boots, and kick-out diverters to move water away from walls and penetrations. Correct sequencing (base/step then cap) prevents capillary leaks and accommodates building movement.

10. Chimney / Masonry - Reglet - For masonry walls (including chimneys) we cut a slot into the masonry wall, then embed cap flashing into sealant, applied inside the cut slot.  This cap flashing covers the base / step flashing described above. 

11. Ridge/hip caps & sealing - We finish with matching manufacturers hip/ridge cap shingles installed to manufacturer specifications. In cool or dusty conditions, we verify seal-down and hand-seal if needed to prevent wind lift.

12. Attic ventilation check - Adequate intake (soffit) and exhaust (ridge) ventilation helps control heat and moisture, supporting shingle longevity and protecting warranties.

13. Final cleanup & photo documentation - We magnet-sweep, haul away debris, and provide before/during/after photos for your records.​​

​

Once we have confirmed you are happy with the work completed, have no outstanding questions, we will provide you with a copy of the Warranty Documents, Project Pictures, and Invoice.