Roof Installation in Leonardtown, MD
An Assembly Engineered to Shed Water and Hold Wind
IRC R905.2.2 sets 2:12 as the minimum slope for asphalt shingles, with doubled underlayment required all the way up to 4:12. Premiere Renovations and Construction installs complete roof assemblies across Leonardtown, MD, and Hollywood: synthetic underlayment, ice barrier, drip edge, step flashing, chimney details and balanced ridge venting. Code also calls for drip edge at both eaves and rakes, a detail missing from many older local roofs. Ice barrier runs from the eave to 24 inches inside the wall line.
Six-nail patterns, matched soffit intake and hand-sealed rakes are what hold a covering down in exposed coastal wind, and valleys and penetrations get flashed in metal rather than sealed with caulk. We build to those details under MHIC #128355 and Registration #7659, with 20+ years behind them. Attic ventilation is sized at 1/150 of the vented area. Detail your project on our contact page and we will specify the whole assembly in writing.
Roof Installation We Provide
New Construction Roof Installation
Specification happens before framing is even complete on a new structure: sheathing thickness, fastener pattern, underlayment class and vent path all decided together. Decisions made in that order avoid retrofitting a ventilation system into an attic that is already finished.
Standing Seam Metal Roof Installation
Concealed-fastener panels lock together at raised seams, leaving no exposed screws to back out or gasket to dry rot. Clips let the metal expand and contract with temperature, which matters on the long, sun-loaded runs common to open waterfront elevations.
Architectural Shingle Installation
Laminated shingles carry two bonded layers, giving them depth on the roof plane and wind ratings that three-tab products cannot reach. Starter course, offset pattern, nail placement in the common bond area and hip-and-ridge caps all follow the manufacturer's printed instructions.
Roof Ventilation Systems
Exhaust at the ridge only works when intake at the soffit matches it. Baffles keep insulation off the vent chute, blocked soffits get opened back up, and net free area is calculated rather than guessed at from the ridge length alone.
Flashing and Chimney Installation
Nearly every leak starts at a transition rather than in the field of the roof. Step flashing goes in shingle by shingle along sidewalls, chimneys receive base, step and counter flashing set into a reglet, and crickets divert water around wide masonry.
Skylight and Roof Penetration Sealing
Skylights, plumbing stacks, bath fans and satellite mounts each break the water plane and each need their own detail. Manufacturer flashing kits, ice barrier collars and properly lapped underlayment keep these penetrations dry long after a bead of sealant would have failed.
How Professional Installation Supports Long-Term Performance
Code-Compliant Installation
Inspectors check specific line items: minimum slope for the covering selected, drip edge at eaves and rakes, ice barrier depth past the wall line, fastener count. Building the assembly to those requirements the first time keeps a project moving on schedule.
Wind-Rated Fastening
Roofs in this wind band call for six nails per shingle instead of the standard four, driven flat in the reinforced nailing zone. Hand-sealing along rakes and eaves adds holding power exactly where uplift pressure concentrates hardest during a coastal blow.
Balanced Attic Ventilation
Code allows 1/300 of the attic floor area in net free vent when a vapor retarder is present or upper venting carries 40 to 50 percent, otherwise 1/150 applies. Balanced airflow lowers summer attic temperatures and slows winter moisture buildup.
Watertight Flashing Details
Metal at every wall, valley, chimney and vent does the real work of keeping water outside. Correctly lapped and fastened flashing outlives sealant by decades, which is why these details get built rather than caulked over at the end of a job.
A Manufacturer-Certified System
Shingles, starter strip, underlayment, hip-and-ridge caps and ventilation from a single manufacturer are tested together as a system. Installing them that way, to printed specification, unlocks the stronger enhanced warranties that mixed, field-assembled components quietly disqualify a roof from ever receiving.
Passed Inspection, First Time
Failed inspections cost days, not minutes, and they usually trace back to something small: a missing rake edge, short ice barrier, four nails where six belong. Photographing each stage before covering it keeps the record straight and the schedule intact.
Frequently Asked Questions
What does roof underlayment do, and what goes under shingles?
Underlayment is the secondary water barrier between deck and shingles, catching anything that gets past the covering. Synthetic sheets have largely replaced #15 and #30 felt because they lie flatter, resist tearing around fasteners and tolerate weather exposure before the roofing goes on.
Is ice and water shield required on a new roof?
Ice barrier membrane belongs from the eave edge to at least 24 inches inside the exterior wall line. It is also the right detail in valleys and at low-slope transitions, where meltwater backs up and standing water lingers longest.
What is drip edge, and is it required by code?
Drip edge is the metal L-profile that carries runoff clear of the fascia and stiffens the deck edge. IRC R905.2.8.5 requires it at both eaves and rakes, and inspectors do check, so treating it as optional trim is a mistake.
How many nails per shingle are required in a high-wind area?
High-wind installation calls for six nails per shingle rather than four, with hand-sealing added at rakes and eaves. Premiere Renovations and Construction specifies that pattern on Leonardtown, MD, roofs because the area sits near a 115 to 120 mph ultimate design wind speed.
How much attic ventilation does a roof need?
Baseline requirement is 1/150 of the vented attic area in net free ventilating area. That drops to 1/300 where a vapor retarder is installed or 40 to 50 percent of the venting sits in the upper attic, with soffit intake balancing it.
What is step flashing, and where is it used?
Step flashing is a bent metal piece woven one per shingle course wherever a roof plane meets a vertical wall or chimney side. Each piece laps the one below, so water running down the wall stays above the shingles instead of behind them.
What is the minimum roof pitch for asphalt shingles?
Asphalt shingles need 2:12 as an absolute minimum under IRC R905.2.2, and anything from 2:12 up to 4:12 requires doubled underlayment. Below 2:12 the covering has to change entirely to a low-slope membrane system rather than shingles of any kind.
Metal roof or asphalt shingles, which is better for a coastal home?
Both perform well when detailed correctly. Standing seam sheds salt spray and wind with no exposed fasteners; Class H shingles rated to 150 mph under ASTM D7158 cost less. Premiere Renovations and Construction walks Leonardtown, MD, owners through both before specifying.
Every Layer Detailed Before the Shingles Go Down
A finished roof looks like one surface, but it is really six or seven layers that only work when each one is installed in the right order. Premiere Renovations and Construction, LLC has been assembling those layers correctly for 20+ years on homes across Leonardtown, MD, and the surrounding St.
Mary's County communities, from drip edge and ice barrier through nailing pattern, flashing metal and a ventilation path that actually breathes. We are happy to walk a roof plan with you, explain what the code requires and where we would go further, and leave you with a written scope. Send the details through our contact page whenever you are ready to talk it through.