Siding contractors glossary

Short, plain-English definitions of the terms you'll meet when choosing a Siding provider in Lake County , Florida.

What are corner posts?: Corner posts are vertical trim components installed at the inside and outside corners of siding to conceal edges and provide a finished appearance on vinyl or metal installations.
What are furring strips?: Thin wood or metal strips installed against a wall or sheathing to create a level nailing surface for siding and allow water drainage and air circulation in the gap between the wall and siding.
What are weep holes in vinyl siding?: Weep holes are small drainage openings built into vinyl siding panels and J-channel trim that allow trapped moisture to escape to the exterior.
What is a drip cap?: A drip cap is an angled trim piece installed above windows and doors that channels water away from the wall surface to prevent moisture intrusion and rot.
What is a fascia board?: A fascia board is the horizontal trim board that covers the ends of roof rafters and supports the gutter system, forming the finished edge where the roof meets the wall.
What is a High-Velocity Hurricane Zone (HVHZ)?: A High-Velocity Hurricane Zone (HVHZ) is a Florida Building Code classification for coastal counties subject to extreme wind speeds and sustained hurricane conditions, requiring building materials and installation to meet the highest wind-resistance standards.
What is a Miami-Dade NOA (Notice of Acceptance)?: A Miami-Dade NOA (Notice of Acceptance) is a product certification issued by Miami-Dade County that verifies siding and other building materials meet rigorous Florida standards for wind and impact resistance, particularly from hurricanes and severe weather.
What is a prorated warranty?: A prorated warranty is manufacturer coverage on siding that pays out a decreasing percentage of repair or replacement costs as the product ages, rather than providing full coverage for the entire warranty period.
What is a soffit?: A soffit is the horizontal panel that forms the underside of a roof overhang, typically vented to allow air circulation into the attic space.
What is a starter strip?: A starter strip is the metal or vinyl trim piece installed at the base of a house that anchors and levels the first course of siding panels.
What is a vapor barrier?: A vapor barrier is a material layer installed within a wall assembly to limit the movement of water vapor from one side to the other, protecting interior structures from moisture damage.
What is a wind load rating?: A wind load rating is a numerical measurement in pounds per square foot that indicates how much wind pressure a siding product can withstand without failure, determined through standardized testing.
What is board and batten siding?: Board and batten siding is a vertical wall covering made of wide boards placed side-by-side with narrow battens nailed over the gaps between them.
What is clapboard siding?: Clapboard siding consists of long horizontal boards that overlap each other like roof shingles, creating a weather-resistant exterior wall covering traditionally used in residential construction.
What is Dutch lap profile siding?: Dutch lap profile is a lap siding design with a horizontal beveled groove cut into the top edge of each board, creating a pronounced shadow line between courses.
What is engineered wood siding?: Engineered wood siding is a manufactured composite material made from wood strands or fibers bonded with resin, designed to resist moisture, insects, and weathering better than solid wood.
What is fiber cement panel siding: Fiber cement panel siding consists of large rigid sheets made from cement, wood fiber, and other materials, installed as whole-panel units rather than individual lap boards.
What is house wrap?: House wrap is a synthetic, breathable membrane installed beneath siding to shed bulk water while allowing water vapor to pass through, preventing moisture damage to the wall structure.
What is insulated vinyl siding?: Vinyl siding panels with an attached foam backing layer that increases structural rigidity and provides thermal insulation compared to hollow-back vinyl.
What is J-channel?: J-channel is a J-shaped trim piece installed along window and door frames and at siding edges to create a finished seal while accommodating thermal expansion and contraction of siding panels.
What is kickout flashing?: Kickout flashing is a small metal diverter installed where a roofline meets a sidewall to channel water away from the siding rather than allowing it to run down the wall.
What is R-value in siding?: R-value is a numerical rating that measures how effectively an insulated siding panel or foam backer board resists heat flow, with higher numbers indicating greater insulating ability.
What is vinyl siding gauge?: Vinyl siding gauge is the thickness of the material measured in mils (thousandths of an inch), typically ranging from .040 to .052 inches or higher for residential applications.
What is Z-flashing?: Z-flashing is Z-shaped metal trim installed above window heads and horizontal trim to channel water away from the underlying wall assembly during siding work.