Frost heave is the single most common cause of structural problems in Westchester decks. Understanding it can save you thousands.
What Is Frost Heave?
When water in soil freezes, it expands — pushing upward on anything above it. In Westchester, ground temperatures below the frost depth (42 inches) never freeze. Above that depth, soil can freeze and expand every winter. Deck footings above the frost line get pushed up every winter and drop back down every spring. After a few years, this cyclical movement loosens connections, stresses the ledger, and causes visible problems.
The 42-Inch Rule in Westchester
All deck footings in Westchester County must extend at least 42 inches below finished grade. This is a code requirement, not a suggestion. It's the most commonly failed inspection item and the most common reason older decks develop problems.
Signs Your Deck May Have Shallow Footings
- Deck has moved up or down relative to the house ledger
- Gaps at the ledger connection that weren't there before
- Post bases that have shifted or are no longer plumb
- Deck is older (built before stricter code enforcement)
What Can Be Done
Existing shallow footings can't be deepened without rebuilding the deck. This is why, when older decks have footing problems, full replacement is often the right call — you get properly installed footings and a new deck for only marginally more than repairing the old one.
Questions? Westchester Home Improvements handles everything for you — permits, drawings, construction. Free estimates, no obligation.
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Be cautious of any quote that comes in dramatically below the others. In this market, a price that seems too good usually is — it often reflects cheaper materials, a crew without proper licensing or insurance, or an intention to raise the price through change orders after work starts. Comparing quotes line by line, rather than by the total alone, is the best way to understand what you're actually paying for.
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