Siding is a rain screen, not a raincoat
Every cladding leaks. Wind-driven rain finds the laps, the nail holes, and the joints, especially in a Columbus spring when storms come in sideways. A siding system that works accepts this and manages the water behind the face: a water-resistive barrier over the sheathing, a drainage plane that lets incidental moisture run down and out, and flashing that directs it away from the framing at every interruption.
Peeling paint, swollen or cupped boards, and staining at the bottom courses are symptoms. The cause is almost always upstream: a window flashed over the water-resistive barrier instead of into it, a barrier lapped backward so water runs behind the course below, a missing kick-out flashing where a roof dies into a wall, a penetration caulked instead of flashed. Replacing boards without correcting the water path replaces the symptom on a schedule.
We treat the water-resistive barrier as the primary defense and the cladding as the first line, not the only one. Openings get flashed and integrated into the barrier shingle-fashion, so gravity works for the wall instead of against it. Where a roofline terminates against siding, we install kick-out flashing to throw water into the gutter rather than behind the cladding. It is a small piece of metal that prevents one of the most common rot patterns in central Ohio housing stock. Grade matters too: Columbus clay soils drain slowly, and splash-back off saturated ground soaks the bottom courses, so clearance above grade is part of the moisture strategy, not a cosmetic choice.
Trim detailing
Trim is where most siding jobs go wrong, because trim is where water concentrates. Window and door casings, frieze boards under the soffit, rake boards along the gable edges, and fascia at the eaves all collect runoff, and each joint is a decision about where that water goes next.
We detail joints to shed: end grain sealed before installation, horizontal surfaces back-beveled or capped with metal, butt joints located away from the wettest zones, and gaps sized to the material’s movement rather than to what looks tight on day one. Caulk has a role, but it is a maintenance item with a service life, not a water-management strategy. A joint that depends entirely on a bead of sealant fails when the sealant does. A joint that is flashed and lapped correctly keeps working after the caulk gives up.
Material categories, without a winner
There is no best siding, only tradeoffs that fit or don’t fit a specific house and owner.
Fiber cement is dimensionally stable, fire-resistant, and holds paint well, but it is heavy, unforgiving to cut and fasten, and repairs mean working cementitious board on a finished wall. Engineered wood is lighter, handles like lumber, and takes fasteners cleanly, but it depends heavily on sealed edges and correct clearances to manage moisture. Vinyl is inexpensive, never needs paint, and tolerates neglect, but it moves substantially with temperature, can crack under cold impact, and its appearance is fixed at install. Wood is the most repairable of the four and the most demanding: it moves with humidity and asks for recoating on a real schedule.
Materials we specify include James Hardie fiber cement and LP SmartSide engineered wood, along with vinyl and wood options where they fit the project. Ohio’s freeze-thaw cycles and humid summers punish any material installed with the wrong clearances. The install matters more than the logo on the carton.
What a correct install looks like
Most siding failures are installation failures. These are the details we hold crews to.
- Water-resistive barrier sequencing. The barrier laps shingle-style, upper over lower, and window and door flashing integrates into it, not over it.
- Coursing layout. Courses are laid out before the first board goes on, so reveals stay consistent, lines land sensibly at openings, and joints stagger per manufacturer documentation.
- Fastener schedule. Fasteners of the specified type, at the specified spacing, driven to the specified depth. Overdriven nails crush fiber cement and dimple vinyl; underdriven nails telegraph through paint.
- Clearances. Gaps at roof surfaces, above horizontal flashings, and above grade, held to the manufacturer’s numbers. Siding that touches a shingle roof wicks water; siding buried in mulch rots from the bottom up.
- Flashing at every interruption. Kick-out flashing at roof-wall intersections, head flashing over openings and trim bands, and Z-flashing at horizontal joints in panel products.
None of this is visible in the finished photo. All of it determines whether the wall is dry in ten years. We document these details because a siding job is a building-envelope job that happens to change how the house looks.