How to Stop Pests at the Source: Air-Sealing with GREAT STUFF PRO™ Pestblock Foam

When most people think about pest control, they think about sprays, traps, or exterminators. But one of the most effective ways to help keep bugs and critters out of a home doesn’t involve pesticides at all — it starts with sealing the gaps they use to get inside.

Tiny openings around pipes, vents, rim joists, and siding act as easy entry points for spiders, ants, cockroaches, and other pests. GREAT STUFF PRO™ Pestblock Polyurethane Foam Sealant is designed to expand into those openings, forming a long-lasting, airtight and water-resistant barrier that helps block pests from entering the home while also supporting energy efficiency.

Even small cracks can cause big problems. They allow pests inside, but they also let conditioned air leak out and unconditioned air leak in. This forces heating and cooling systems to work harder and can increase energy costs.

According to the Residential Energy Services Network (RESNET), air-sealing and insulating projects around the home can help homeowners save up to 30% on energy costs. Sealing gaps with foam is a practical way to address both pest entry points and air leakage at the same time.

What GREAT STUFF PRO™ Pestblock Is Designed to Do

GREAT STUFF PRO™ Pestblock is a gun-applied polyurethane foam sealant that expands up to 3 inches to take the shape of cracks, gaps, and penetrations. Once cured, it forms a durable, airtight, and water-resistant seal that helps block a wide range of pests, including spiders, bees, ants, cockroaches, and more.

It is formulated to block pests without pesticides, making it a physical barrier solution rather than a chemical treatment. It is also designed not to harm bees, supporting more environmentally conscious building practices.

Key product features include:

• Expands to fill, seal, and insulate gaps up to 3 inches
• Forms a long-lasting, airtight, weather-resistant seal
• Adheres to wood, metal, masonry, glass, and most plastics
• Tack-free in approximately 6 minutes; trimmable in about one hour
• Paintable, stainable, and sandable once cured
• Reusable for up to 30 days when left attached to a GREAT STUFF PRO™ dispensing gun

Where Pestblock Is Commonly Used

Pests often enter buildings where mechanical systems and framing interrupt the structure. GREAT STUFF PRO™ Pestblock is commonly used to seal:

• Pipe and plumbing penetrations
• Electrical penetrations
• Dryer and exhaust vents
• HVAC and duct penetrations
• Attic penetrations
• Rim joists
• Sill plates

These areas are among the most frequent sources of both pest intrusion and air leakage. Sealing them helps support more consistent indoor conditions while reducing unwanted entry points.

Supporting Better Home Performance

In addition to blocking pests, Pestblock foam helps seal holes, gaps, and cracks that allow air to escape or enter the home. Because it forms an airtight and water-resistant seal, it supports broader air-sealing efforts and contributes to improved overall building efficiency.

GREAT STUFF PRO™ Pestblock is part of the PRO Series of polyurethane foams, formulated for professional performance and controlled application. When used with a compatible PRO dispensing gun, it allows for precise placement, high yield, and cleaner application, making it suitable for both contractors and serious DIY users.

If pests are getting inside, there is an opening somewhere. Sealing that opening is one of the most reliable long-term strategies for pest prevention. GREAT STUFF PRO™ Pestblock Polyurethane Foam Sealant works at the source of the problem — expanding into gaps to help block pests while also supporting air-sealing and energy-efficiency goals.

Instead of relying solely on reactive pest treatments, Pestblock offers a proactive solution that closes off access points and helps improve how the home performs overall.

At AWarehouseFull, we make it easy to get professional-grade products like Pestblock at competitive prices, whether you’re a contractor stocking up for a big job or a DIY homeowner tackling air-sealing and pest prevention yourself. Shop with confidence knowing you’re getting a quality product backed by performance you can trust.

Order your GREAT STUFF PRO™ Pestblock today and start sealing smarter.