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Protecting Duplexes From Destructive Storm Damage

Last updated October 25, 2026

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The short answer

Start with the Roof and Gutters

Your duplex has two units under one roof, so a roof leak can affect both sides. Check for missing or loose shingles, especially after a hail storm. Look at the flashing around chimneys and vents. If you can see daylight or feel dampness, that is a sign water is getting in.

Clean gutters and downspouts before storm season. Clogged gutters force water under the roofline and into walls. Trim tree branches that hang over the roof. In a humid subtropical climate with hot summers and spring hail and thunderstorms, keeping the roof in good shape is your first defense.

Seal Windows and Doors

Wind-driven rain can push water through tiny gaps around windows and doors. Check the caulking and weather stripping on both units. Replace any cracked or hardened sealant. Pay extra attention to the side of the duplex that faces the prevailing wind.

If you have a shared wall between units, check the flashing where the wall meets the roof. Water can enter at that joint and travel into both homes. Apply fresh exterior caulk where siding meets trim. This simple step reduces the chance of hidden leaks during heavy rain.

  • Inspect window frames for rot or gaps
  • Replace worn weather stripping on doors
  • Re-caulk around window and door trim
  • Check the shared wall flashing for damage
  • Clear debris from window wells and vents

Protect Against Flooding

Duplexes often sit on a slab or have a crawlspace. If your area floods, water can enter through the foundation or the lowest level. Check the grading around the building. The ground should slope away from the foundation so water drains out, not in.

If you have a crawlspace, make sure vents are clear and the ground inside is dry. Consider installing a drainage system if water tends to pool. Keep any important items off the floor in lower areas. If water does get in, dry the space within 48 hours to slow mold growth.

Know Your Shutoff Locations

A storm can knock out power or cause a pipe to burst. Find the main water shutoff valve for the whole duplex and the gas shutoff if you have gas. Write down the locations and share them with your neighbor or tenant. If you live in Frisco, keep that list in a dry, easy-to-reach place.

Also know where your electrical panel is and how to turn off the power safely. After a storm, if you smell gas or see sparks, get out and call the utility company. Do not touch wet electrical equipment. Your safety comes first.

After the Storm, Dry and Inspect

Once the storm passes, walk through both units with a flashlight. Look for wet spots on ceilings, walls, and floors. Use fans and dehumidifiers to dry wet areas quickly. Remove wet carpet or padding if it is soaked, because it can hold moisture and lead to mold.

If you see water stains or feel dampness behind walls, you may need a professional look. A water damage inspection can find hidden moisture and help you decide what repairs are needed. The pros use moisture meters and thermal cameras to check inside walls without tearing them open.

  • Dry wet areas within 24 to 48 hours
  • Use fans and dehumidifiers to speed drying
  • Remove wet carpet or drywall that is soaked
  • Check for musty smells, a sign of mold
  • Take photos of any damage for your records

Need help right now?

Every hour counts once water gets into floors and walls. One call starts the response.

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Frequently asked questions

What should I do first after a storm damages my duplex?

Check for immediate dangers like downed power lines or gas leaks. If safe, turn off water and electricity if needed. Then start drying wet areas. Take photos of the damage. Call your insurance company to report the loss. Policies vary, and your insurer decides what is covered.

Can I dry the water damage myself?

You can dry small, contained areas with fans and dehumidifiers. But if water soaked into drywall, insulation, or under flooring, you may need professional help. Hidden moisture can cause mold and structural damage. A water damage inspection can reveal the true extent.

How do I know if mold will grow after a storm?

Mold can start growing within 24 to 48 hours in damp conditions. If you see discoloration, smell a musty odor, or feel a damp spot, mold may be forming. Dry the area quickly and consider consulting a mold professional. If you feel unwell, see a doctor.

Call Now (469) 535-6935