Pest control in historic homes is a unique challenge for residents in Washington DC, Maryland, and Virginia. The mid-Atlantic region is a treasure trove of architectural history. From the stately Georgian manors of Virginia to the Federal-style townhomes in DC’s oldest neighborhoods and the Victorian gems throughout Maryland’s Montgomery and Prince George’s Counties, historic homes are more than just places to live. They are part of the cultural and architectural fabric of the region.
Each of these historic styles brings beauty and charm, but also aging materials, hidden gaps, and original construction methods that make them more vulnerable to pests. Protecting these homes takes expert care and precision. Read our Biotech-certified guide for five essential tips to keep your historic home pest-free and preserved for generations.
1. Inspect and Seal Vulnerable Entry Points
Historic homes often have original foundations, chimneys, and windows that shift or settle over time. These changes can create small gaps and cracks that invite pests like rodents, termites, ants, and even bats. Common culprits include deteriorating mortar, loose flashing, and warped wooden frames. A careful inspection should include the foundation, attic, roofline, window casings, and areas where utility lines enter the home. Pay close attention to spaces behind baseboards and under porches, which are often overlooked.
Once identified, these entry points should be sealed using pest-safe materials such as copper mesh, silicone-based caulks, and fine metal screens that maintain the home’s aesthetic. At Biotech, we specialize in inspecting historic structures and sealing them with techniques that respect original architecture while providing long-lasting protection against pests.
2. Preserve Wood Without Attracting Termites
Exposed wood is a hallmark of many historic homes, but it can also be a magnet for pests such as termites and wood-boring beetles. Keep wood elements dry and well-ventilated. Avoid piling mulch near the foundation and ensure gutters and downspouts direct water away from the home. If treatment is necessary, opt for low-impact or borate-based products that are safe for historic materials.
Regular inspections are also key. Early signs such as small holes, sawdust, or soft spots can go unnoticed in ornate trim or hidden beams.
3. Maintain Proper Ventilation and Moisture Control
Moisture is one of the biggest threats to both historic structures and pest control. Crawl spaces, basements, and attics should be dry and well-ventilated. Install vapor barriers if needed, and monitor for signs of mold or mildew. Controlling humidity helps discourage pests like silverfish, cockroaches, and centipedes that thrive in damp conditions.
Even minor issues like condensation on windows or musty smells in closets can be signs of poor airflow. Consider using dehumidifiers in problem areas and checking for plumbing leaks, especially in older pipework. Good ventilation not only prevents pests but also helps preserve plaster, wood, and other original materials from long-term damage.
4. Check Chimneys, Crawl Spaces, and Attics for Hidden Activity
Older homes often have less-sealed, rarely used areas that become prime nesting spots for pests. Chimneys without proper caps can attract birds, squirrels, or even raccoons. Crawl spaces and attics, especially those with original insulation or outdated ventilation, may hide rodents, bats, or insects that go unnoticed for months.
Make it a habit to inspect these areas seasonally. Look for droppings, chewed materials, nests, or unusual odors. Installing proper chimney caps, screens, and sealing access points can make a big difference. These hidden zones are often where infestations start, so early detection is key to protecting your entire home.
5. Schedule Regular Pest Inspections
Not all companies are equipped to work with pest control in historic homes. Choose professionals who specialize in older homes and understand their structural nuances. Regular inspections can catch issues before they escalate, from powderpost beetles in exposed beams to raccoons nesting in outdated chimneys. A proactive approach will protect both your investment and the story your home tells.
At Biotech, we offer specialized inspections tailored to historic homes, identifying potential problems early and ensuring that your property remains pest-free while preserving its unique character. Schedule your free inspection today.
