Italian Cypress Roots and Fiberglass Pool Damage: Diagnosis and Root Barrier Solution

Did Italian Cypress Roots Puncture My Fiberglass Pool?

Two Italian cypress (20 ft tall) stand 15 and 20 ft from a pool hole. Neighbor’s 100-year-old oak is 70 ft away. Repairman blames tree roots.

Determine the Culprit: Protected Root Zone (PRZ) Calculation

1. Measure tree circumference (inches) at 4.5 ft height.
2. Divide by 2 → radius in feet of PRZ.
3. Example: 30″ circumference → 15 ft PRZ radius.

If the pool lies within a tree’s PRZ, that tree’s roots could be responsible.

Non-Removal Solution: Root Barrier Trench

1. Dig trench 12–18″ deep between tree and pool.
2. Cut all roots encountered.
3. Install barrier: cement/brick wall, or backfill with sand (easier to re-dig later).
4. Repeat every few years as roots regrow.

Benefit

Preserves trees while protecting pool. Identify the offending tree first via PRZ measurement.