Water Damage Restoration in Chantilly, VA

Seepage, pumps and clay

Water damage restoration in Chantilly often begins with a basement that was dry for years and then seeped after a long rain. Clay-heavy ground holds water against the foundation, and the footing drain and sump have to carry the load.

Chantilly is in western Fairfax County, about eleven miles south of Ashburn. We handle water extraction, drying and mold work here, along with commercial calls from nearby warehouses and flex space.

Seepage, flood or plumbing leak

Geography around Chantilly

Chantilly sits beside Washington Dulles International Airport, and the Steven F. Udvar-Hazy Center, the Smithsonian's annex at Dulles, opened there in December 2003. Large paved areas and roofs shed fast runoff, which feeds nearby streams.

Sully Historic Site, the home of Richard Bland Lee, sits on land the county has preserved, and Ox Hill Battlefield Park marks the site of a Civil War battle fought on September 1, 1862. Both sit on gently rolling ground typical of the area, where water finds low spots in lawns and yards.

Services most needed here

Local risks

Fairfax County notes that many soils in the county have high water tables and thick clay layers in the subsoil, and that diabase bodies sit under parts of the western county. Where clay or rock is near the surface, water has trouble draining downward and ends up beside the foundation.

A basement can seep even when the pump is working. If the pump keeps up, you may see a damp strip at the wall. If it falls behind, you see water on the floor. Our sump pump failure page explains the usual failures.

We cannot say what the soil is under a particular lot. The county soil map and a geotechnical engineer can.

Warehouses and flex space nearby

The Chantilly area has a lot of warehouse and flex space, and those buildings have their own water problems. Sprinkler lines in unheated bays freeze, roof drains clog and loading dock slabs take on water. We plan drying around operating hours when we can.

See our commercial water damage page for property types and how we plan the work. We do not handle data center or server-room work.

An example call from a Chantilly basement

After three days of rain, the sump pit in a finished basement is running almost nonstop. By evening the pump falls behind, and a thin sheet of water spreads across the floor from the wall and floor joint. The carpet is damp by the time the owner notices.

We extract the water, lift the carpet and pad and meter the walls. Water that came through the joint from the ground is Category 2 at least, so the pad is replaced and the drywall is cut above the wicking. We also check the pump and the discharge to see why it fell behind.

Often the answer is simple. The discharge line is too short, the pump is old or the downspouts empty beside the foundation. We record what we saw so a plumber or contractor can fix it.

Prevention for Chantilly basements

• Extend downspouts so they end several feet from the foundation.
• Regrade soil so it slopes away from the house.
• Test the sump pump a few times a year and add a battery backup.
• Keep window wells clear and make sure their drains work.
• Store items off the basement floor in plastic bins.
• Use a dehumidifier to keep humidity under about 50 percent.

Mold after seepage

A damp strip along the base of a basement wall is where mold starts. The drywall wicks water, the paper face feeds mold and the baseboard hides it. We check that strip with a meter and remove the damaged section before it spreads. See our mold removal page if you have already found growth.

Keeping a simple sump log

A notebook beside the pit helps more than people expect. Write down the date, how long it rained and how often the pump ran. After a few storms you will see a pattern, such as a pump that runs every few minutes after an inch of rain and starts to lose ground after two.

That pattern tells a plumber whether the pump is the right size and whether the discharge is the limit. It also tells us, on a call, how close the system was to its limit when it failed.

If you notice the interval between pump cycles getting shorter over time, it can mean the pit is filling faster than before. Something may have changed in the yard, such as a new downspout or a blocked drain.

Window wells and walkout doors

Lower-level windows and walkout doors are common entry points for storm water. A window well with a clogged drain fills like a bucket, and water presses on the glass or leaks through the frame. A walkout door with poor grading lets surface water sit at the threshold.

Clear leaves from wells before heavy rain and check that the drain at the bottom moves water. Regrade soil near walkouts so it slopes away from the door.

Pump backup options are compared in Sump Pump Backup Options When the Power Goes Out.

Questions from Chantilly homeowners

Back to Ashburn Resto home. Neighboring areas we also serve include Herndon and Sterling.