Complete GAF Timberline HDZ SG Roof Replacement | 5-Inch Gutter System with Oversized 3x4 Downspouts








Complete GAF Timberline HDZ SG Roof Replacement | 5-Inch Gutter System with Oversized 3x4 Downspouts









This Round Rock roofing project replaced worn comp shingles with GAF Timberline HDZ SG architectural shingles. The system used Tiger Paw underlayment, StormGuard ice and water shield, and Cobra ridge venting for balanced airflow. HDZ shingles hold up well against Central Texas hail and 100-degree summer heat. The steep 8/12 and 10/12 sections were handled with the right safety gear and detail work.
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We finished the job with new 5-inch gutters and oversized 3x4 downspouts across the Round Rock home. The bigger downspouts clear heavy downpours and cedar pollen buildup better than standard sizes. Clean water routing keeps runoff away from the limestone-heavy soil near the foundation. Installed in one focused day after the roof was complete.
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The homeowner reached Austin Pro on October 4, 2023 through a family referral passed along by our office staff. The first conversation focused on storm damage to the aging comp roof and the insurance claim process.
We inspected the roof and found worn comp shingles across steep 8/12 sections, plus tired flashing at the penetrations. The gutters were also due for replacement. Findings moved the job to the prospect stage on October 17, 2023.
The project was approved on October 18, 2023, just one day after the prospect stage. We built the scope as a full GAF Timberline HDZ SG system with a matching 5-inch gutter package to fit the insurance claim.
The crew tore off the old shingles and installed the new GAF system over multiple days, taking extra care on the 8/12 and 10/12 steep sections. Tiger Paw underlayment, StormGuard, ridge venting, and new flashing all went in before the gutters followed in a single day.
Both the roof and gutters were completed on October 30, 2023, with a final cleanup and metal touch-up using Rust-Oleum enamel.
We replaced the full roof and gutter system on this Round Rock home, swapping tired comp shingles for a new GAF Timberline HDZ SG roof and adding 5-inch gutters with oversized downspouts. The result is a weather-ready exterior built for Central Texas storms.
The existing comp shingles had reached the end of their service life. Years of hail, hard sun, and wind had worn the shingle mat thin. This was insurance work, so getting the full system right mattered for long-term coverage.
Steep pitch was the story on this house. We logged a steep fee for the 8/12 roof and a separate charge for a 10/12 section, which changes how a crew moves and how long each square takes. Steep roofs slow everyone down for safety, so we planned this one over multiple days instead of rushing it. The pitch also means water sheds fast, which makes the underlayment and flashing details even more important. Skip those, and steep roofs leak at every penetration. We took the time to get the pipe flashing and ridge caps sealed right.
We built the roof as a full GAF system, not just shingles on felt. Timberline HDZ SG shingles sit on Tiger Paw synthetic underlayment, with StormGuard ice and water shield at the vulnerable spots. The synthetic underlayment holds up to Central Texas heat far better than old-style felt, which can dry out and crack when attic temps climb past 100 degrees. We also added a mix of Cobra ridge venting and a slant-back box vent to move hot air out of the attic. Balanced airflow keeps the shingles cooler from below and helps them last their full life.
The gutters went in as a clean one-day job after the roof was finished. We ran 5-inch gutters with 3x4 downspouts, sized to handle the heavy, fast rain that hits Round Rock in storm season. Oversized downspouts also clog less when cedar pollen and leaf grit wash off the roof.
The home now has a complete, sealed roof-and-gutter system ready for the next hail season. The GAF setup carries strong manufacturer coverage, and the gutters protect the fascia and foundation from runoff. Everything closed out cleanly in early 2024.
They handle heat, wind, and hail well, which matters in a region that sees all three. The HDZ line also installs with a wide nailing zone, so the crew can seat each shingle accurately even on a steep 8/12 pitch.
The roof ran over multiple days because of the steep pitch, and the gutters followed in one day. From approval on October 18 to completion on October 30, 2023, the field work wrapped in under two weeks.
Bigger downspouts move more water per minute and resist clogging from cedar pollen and debris. During a hard Central Texas downpour, that extra capacity keeps water off the fascia and away from the foundation.
Yes, this was an insurance claim job. We documented the storm damage and matched the full GAF system to the scope, so the homeowner got a complete roof rather than a patch.





