Roofing Nails in Your Pool — The Frisco Problem Nobody Talks About
Your roofer didn't check the pool. Now there's a rust stain on your plaster from a nail sitting on the bottom. One nail, one month, permanent damage — here's how to prevent it.
You had your roof replaced last month. The roofers did a great job — new shingles look perfect, cleanup was thorough, they even used a magnet roller on the driveway to pick up dropped nails. But they didn't check the pool. Nobody checked the pool. And now there's a small brown stain forming on the deep end floor that wasn't there before.
That stain is rust. From a roofing nail sitting on your plaster.
This is a problem we see regularly in Frisco's established neighborhoods — Starwood, Newman Village, older sections of Phillips Creek Ranch — where homes are 15-20 years old and roof replacements are happening on every other block. Roofers are focused on the roof. Pool owners assume the pool fence keeps debris out. Neither is thinking about the nails that bounce off the roof, hit the deck, and roll into the water.
How Nails End Up in Your Pool
Roofing involves removing thousands of old nails and driving thousands of new ones. Despite best practices — magnetic sweepers, tarps, careful cleanup — nails escape. They bounce unpredictably when pulled from old shingles. They fall from scaffolding and roll across the deck. Wind carries lightweight nails and shingle fragments across fence lines.
If your pool is within 30 feet of the roofline — and most Frisco backyard pools are — some debris reaches the water. Shingle grit settles on the surface and gets filtered out. But nails sink directly to the bottom and become invisible once they settle on the pool floor, especially in the deep end where you can't see detail from the deck.
The problem isn't limited to your own roof. If your neighbor is having roofing work done, nails travel across fence lines. We've found roofing nails in pools where the homeowner hadn't done any construction — the source was the neighbor's roof replacement two houses down.
The Damage Timeline
Week 1: The nail sits on the plaster. Chlorinated pool water begins oxidizing the iron surface. Nothing visible yet.
Week 2-3: Rust develops. A faint brown halo appears around the nail — visible if you look straight down from the pool edge, but invisible from the deck at a normal angle.
Month 1-2: The rust stain expands to a 2-4 inch circle around the nail. Iron oxide is dissolving into the plaster surface. At this point, removal of the nail plus a spot acid treatment ($100-200) can usually eliminate the stain.
Month 2+: Iron has penetrated into the plaster matrix. The stain is permanent. Remediation options are localized replastering ($300-600) or full resurfacing ($5,000-14,000) if multiple stains have formed across the pool.
One nail. One month of sitting undetected. Thousands in potential damage.
How to Prevent It
Before roofing work: Cover the pool with a tarp or safety cover ($50-100 from any hardware store). Tell your pool service the dates so we can schedule a post-construction floor inspection.
During roofing work: Keep the pump running. Don't swim. Ask roofers to sweep the pool deck area with a magnetic roller daily.
After roofing work: Inspect the pool floor at dusk with the pool light on — the underwater light casts shadows that make small objects visible. Run your robotic cleaner and check its filter bag for metal debris. Have your pool service do a manual floor inspection.
If your neighbor is roofing: Close your pool cover or drape a tarp over the nearest pool edge. Check the pool floor daily during construction.
We Found One — Now What
Remove the nail immediately — use a pool pole with a leaf rake or magnetic retrieval tool. Don't wait for your next service visit.
If the nail was there less than a week, the stain is likely surface-level and can be treated with a spot acid application. If it's been weeks or months, have a professional assess whether the stain has penetrated the plaster.
Then check for more. If you found one, there may be others — especially in the deep end where heavy objects roll and settle. Check the pump strainer basket too — smaller metal fragments may have been caught before reaching the floor.
The universal rule: cover the pool during any construction within 30 feet of the pool edge. A $50 tarp prevents thousands in damage.
Construction happening near your Frisco pool? Hydra Pool Services provides post-construction pool inspections — we find the nails before they cause permanent damage. Get your pool inspected →
John Smith, CPO-Certified Pool Technician
Servicing pools across Frisco, Plano, McKinney & North DFW.