· Michael Blair
Siding tends to be replaced for appearance long before it has failed, or left long after the wall behind it has begun to suffer. A few signals separate the two.
Signals that mean replace
Widespread rot or soft board, particularly low on walls and beneath windows. Repeated paint failure across whole elevations rather than in patches.
Panels that have become brittle and crack when flexed, or a wall plane that has waved because the sheathing behind has swollen.
Signals that mean repair
Localised damage from a discrete cause — impact, a specific leak, one rotten board under a failed gutter joint. Fading, chalking and dirt are cosmetic.
A handful of loose or unzipped vinyl panels is a repair, not a re-side.
- Widespread soft board: replace
- Localised damage with a known cause: repair
- Brittle, cracking panels: replace
- Fade and chalk only: wash or paint
- Wall plane waving: investigate the sheathing
The energy and insulation opportunity
A re-side is the one moment when the wall is open from outside. Adding a continuous insulation layer or a rainscreen gap is cheap while the siding is off and expensive at any other time.
In Middle Tennessee, a drainage gap behind the siding is worth asking about — it lets the wall dry outward, which matters in our humidity.
Sequencing with other work
Windows before siding, always. Replacing windows after new siding means cutting into fresh work and compromising the flashing that was just installed.
Roof before siding as well, since roof-wall flashing is installed in a specific order and doing it out of sequence produces exactly the junction failures that cause rot.