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Siding is a wall assembly, not a finish
Siding is the wall assembly you can see, and the part you can see is the least important part of it. What keeps a wall dry is the layer behind the cladding and the flashings at every opening, which is why two houses with identical siding can perform completely differently.
That matters more in the southeast than in a drier climate. Humidity, wind-driven rain and long cooling seasons all push moisture at a wall, and a wall that cannot dry after it gets wet will eventually tell you so through the finish.
Water resistive barrier and flashings do the work, cladding sheds the bulk.
Windows, doors and penetrations, not the field of the wall.
The details where cladding meets roof, eave and grade.
Across all four divisions of the business.
Cladding sheds water. The barrier behind it keeps the wall dry
No siding is watertight, and none is designed to be. Water gets behind cladding at laps, at fasteners and around openings, and a wall assembly is built on the assumption that it will. The water resistive barrier behind the siding is what actually keeps the sheathing dry, and the flashings at every opening are what direct water back out.
This is why replacing siding without looking at what is behind it is a cosmetic exercise. If the barrier is torn, missing at a seam, or lapped the wrong way, the new cladding will look better and the wall will keep getting wet. The point in a project where the barrier is visible is a short window, and it is the most valuable inspection on the job.
It is also why drainage matters. A wall that can drain and dry behind the cladding tolerates the water that inevitably gets in. A wall that traps it does not, and in a humid climate that is the difference between a long service life and a rebuild.
Openings are where walls leak
The field of a wall rarely fails. Windows, doors, hose bibs, dryer vents, electrical penetrations and the intersections where a wall meets a roof are where the water finds a path, and every one of those is a flashing detail rather than a siding detail.
Window head flashing is the most common miss. Without it, water running down the face of the wall arrives at the top of the window and has nowhere to go but in. The damage is slow, hidden, and usually discovered when the trim below the sill starts to go soft.
The wall-to-roof intersection is the second. Where a lower roof runs into a wall, kick-out flashing at the bottom of that run is what stops water being dumped behind the siding. It is a small piece of metal, it is left off constantly, and it produces some of the worst concealed rot found in wall cavities.
How the work happens
5 stagesFrequently Asked Questions
How do I know if my siding needs replacing or just repair?
Localised damage on a wall that is otherwise sound is a repair. What argues for replacement is evidence that the layer behind the cladding has failed: soft sheathing, staining at the base of the wall, or repeated problems at the same openings. Those are barrier and flashing failures, and they are not fixed by patching the visible layer.
Can new siding go over old?
It is possible with some materials, and it is usually the wrong call. Covering the existing cladding means the water resistive barrier and the sheathing are never inspected, and it makes the flashing details at every opening harder to do properly. The wall you cannot see is the wall that decides how long the work lasts.
What causes wall rot when the siding looks fine?
Missing flashing, most often. Head flashing above windows and kick-out flashing where a lower roof meets a wall are the two that get left off, and both direct water into the cavity rather than out of it. The cladding stays intact while the sheathing behind it degrades, which is why the damage tends to be advanced by the time it is visible.
Does siding need to match what the roof is doing?
At the intersections, yes. Where a roof plane runs into a wall, the roof flashing, the kick-out and the siding termination are one detail handled by whoever is on site. When roofing and siding are done by different trades at different times, that junction is where the responsibility gap lands, and it is a common source of leaks.
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