Arizona pests don't need much space to get inside. Bark scorpions can squeeze through gaps thinner than a credit card, while mice can enter through openings about the size of a dime. As Arizona homes age and building materials expand and contract in the desert climate, small gaps can develop around foundations, utility lines, doors, and other exterior features.

That's where pest exclusion comes in. At Northwest Exterminating, our Desert Guard exclusion service helps protect homes across The Valley and Southern Arizona by identifying and sealing the openings pests use to enter. By creating a physical barrier against scorpions, rodents, spiders, ants, and other common invaders, Desert Guard provides an added layer of protection, helping keep pests where they belong — outside.

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What Is Pest Exclusion?

Pest exclusion means physically sealing the gaps, cracks, and openings that allow pests to enter your home. Instead of waiting for pests to get inside and then treating them, exclusion stops them at the door.

Why Does Exclusion Matter So Much in Arizona?

Arizona's climate puts unique stress on homes. Extreme daytime heat, followed by rapid cooling at night, causes building materials to expand and contract repeatedly. Over time, this creates gaps in areas that were originally sealed tight.

Stucco develops cracks, gaps form around pipe penetrations, weatherstripping deteriorates faster than it does in milder climates, and garage door seals warp. These aren't gaps you'd notice walking by, but they're more than enough for scorpions, spiders, ants, and rodents to squeeze through.

Our technicians see this across every type of home — from older stucco homes in Tucson's midtown to newer builds in Queen Creek and Surprise. The desert environment creates these openings faster than most homeowners realize.

What Entry Points Does Desert Guard Address?

During a Desert Guard inspection, our team evaluates your home's exterior for every type of opening pests could use. Common areas we address include:

  • Gaps along the foundation where stucco meets concrete or block

  • Openings around plumbing and electrical penetrations, including where AC lines enter the structure

  • Weep holes in block walls and brick veneer — designed for drainage, but frequently used by scorpions and insects

  • Garage door seals that have warped, cracked, or pulled away from the frame

One of the most common things we find during Desert Guard inspections is damaged garage door seals. Homeowners rarely notice the gap, but it can provide easy access for scorpions, crickets, spiders, and other pests.

We also inspect roofline transitions, vent screens, stucco trim details, and other areas where small openings can develop over time. Every home is different, and the inspection identifies the specific vulnerabilities on your property.

Once the inspection is complete, our team seals these openings using materials matched to each situation — expanding foam, copper mesh, caulk, weatherstripping, and screening. The goal is a complete, durable seal that doesn't interfere with how the home functions.

Which Pests Does Exclusion Keep Out?

That's what makes exclusion so effective — it addresses multiple pests at once rather than targeting one species at a time.

Scorpions are one of the biggest reasons Arizona homeowners request exclusion work. They can flatten their bodies to fit through gaps as thin as a credit card. If there's an unsealed opening along your foundation or around a door frame, bark scorpions will find it.

Rodents are another major beneficiary of exclusion. Rats and mice need surprisingly small openings — mice can fit through a gap the size of a dime. Sealing the roofline and foundation entry points cuts off their access entirely.

Spiders, ants, earwigs, crickets, and cockroaches all benefit from the same exclusion work. Any pest that enters through structural gaps is affected. For homeowners dealing with multiple pest types, exclusion often produces the most noticeable improvement in indoor pest pressure.

How Does Exclusion Work With Quarterly Pest Control?

Exclusion and treatment complement each other. Treatment helps reduce pest populations around your home and creates a protective barrier around the structure. Exclusion closes the physical gaps that pests use to enter.

When both are in place, your home benefits from two layers of protection. Pests approaching the structure encounter treated areas around the home, while exclusion helps eliminate the openings they would otherwise use to get inside.

Our home pest control plans — including Defense, SMARTDefense, and SMARTDefense Complete — can be paired with Desert Guard for comprehensive protection that addresses both pest activity and pest entry points.

How Long Does Exclusion Work Last?

The materials we use in Desert Guard are selected specifically for Arizona's conditions. They're designed to withstand extreme heat, UV exposure, and the expansion-contraction cycles that break down standard caulks and foams.

Our Desert Guard materials are backed by a one-year warranty for replacement and labor. 

Frequently Asked Questions About Exclusion

Is pest exclusion the same as weatherproofing?

There's overlap, but exclusion specifically targets openings that pests use. Some gaps that matter for pest control — like weep holes or certain construction gaps — aren't addressed by standard weatherproofing.

Does exclusion work prevent termites?

Exclusion addresses above-ground entry points used by insects, spiders, scorpions, and rodents. Subterranean termites typically enter from below ground and require separate treatment.

How long does a Desert Guard installation take?

Most homes can be completed in a single visit. Larger homes or properties with extensive gaps may require a follow-up. Our team will let you know what to expect after the initial inspection.

Will sealing my home trap moisture inside?

No. Desert Guard preserves ventilation pathways while closing pest entry points. Weep holes, for example, are screened rather than sealed — allowing drainage while blocking insects and scorpions.

Can exclusion help with scorpions already inside my home?

Exclusion prevents new scorpions from entering. For scorpions already inside, interior treatment combined with exclusion is the most effective approach.

Protect Your Arizona Home With Northwest Exterminating

Northwest Exterminating has been helping homeowners across Phoenix, Tucson, and Southern Arizona keep pests out since 1990. If you're dealing with recurring pest problems or want to prevent them before they start, request a free consultation or give us a call to learn more about Desert Guard and our home pest control plans. We'll inspect your home and recommend the right level of protection for your property.