The hardest part of an addition roof is the junction: valley or flashing lines where new slopes meet the existing house, and matching elevations so water sheds across the seam instead of into it. We plan tie-ins around drainage first, then aesthetics — matching existing shingles as closely as current production allows, or deliberately transitioning to a complementary material. Step flashing at the wall junction is installed piece by piece with each shingle course, never surface-caulked after the fact.
New installations let us get ventilation right from day one. We calculate net free vent area against the 1/150 baseline for the attic footprint, balance intake at the soffits with exhaust at the ridge, and make sure insulation will not block the intake path. Done at installation, this costs little; retrofitted later, it costs real money and the shingles above a hot attic age faster in the meantime. We will show you the calculation for your building rather than asking you to trust a rule of thumb.
Most Marietta new roofs use architectural shingle — October 2026 installed pricing $4.50–$7.00 per square foot — with standing seam metal at $10–$16 per square foot for owners who want its longevity and clean lines, plus flat systems for low-slope sections. Prices are per measured roof area including deck preparation in the quoted scope. Permit requirements differ between the City of Marietta and unincorporated Cobb by parcel and project; we confirm yours before quoting so the number you approve is the number you pay.
