If you own a brick home in North Texas, there’s a row of small openings near the base of your exterior walls that you’ve probably walked past a thousand times without noticing. Those are weep holes in brick. And they’re one of the most overlooked pest entry points on your entire property.
From neighborhoods near Stonebriar Centre in Frisco to homes around Watters Creek in Allen and Historic Downtown McKinney, we see this issue on brick homes every day.
Here’s the problem: the same gaps that help your walls breathe and drain moisture are also open invitations for roaches, spiders, scorpions, and other pests. Most homeowners have no idea they’re even there.
This guide explains:
- What weep holes in brick are and why they matter
- How pests use them to get inside
- And how CitiTurf protects them for free during our pest treatment in Collin County and surrounding areas
No jargon. No fluff. Just straight answers.
What Are Weep Holes?
Weep holes are small gaps — usually about 3/8 of an inch wide — left in the mortar joints along the bottom course of a brick wall. Builders put them there on purpose during construction. They’re required by the International Residential Code and by most local building codes across North Texas.
You’ll typically find them every 24 to 33 inches along the base of your home’s exterior. They look like tiny rectangular openings in the mortar between bricks.
In most brick homes across Plano, Frisco, Allen, McKinney, and surrounding areas, these gaps are completely exposed. No screens. No covers. Nothing between the outside and the interior wall cavity.
What Are Weep Holes Used For in Brick Homes?
The purpose of weep holes in brick is straightforward: moisture drainage and airflow.
Brick veneer walls, the standard construction method for homes in North Texas, include a narrow air gap between the brick exterior and the structural sheathing underneath. When rain hits your brick, some water passes through the mortar joints and collects inside that cavity.
Weep holes allow trapped water to drain out before it causes damage.
Also, they allow air to circulate behind the brick, helping the wall cavity to dry between rainstorms. Without that airflow, moisture can sit and create conditions for mold, wood rot, and long-term structural damage. According to the EPA, proper moisture management in exterior walls is critical for long-term home health, especially in humid, storm-prone climates.
In short, weep holes in brick wall construction serve two essential functions:
- Drain water out
- Promote airflow inside the wall cavity
Both are especially important in North Texas, where brick veneer construction is common and homes are routinely exposed to heavy spring rains, shifting temperatures, and long periods of summer heat.
Understanding what weep holes are used for also explains why you can’t simply seal them shut when pests become a problem.
Can Pests Get in Through Weep Holes?
Yes. And this is where the real problem starts for most homeowners.
Weep holes are open gaps at the base of your home, which makes them prime pest entry points for anything small enough to fit through a 3/8-inch opening. In North Texas, that list is longer than most people expect. Weep holes in brick homes are essentially unlocked doors at ground level.
And most of these pests don’t need much space at all. This is especially common in areas near greenbelts, creeks, and wooded trails like those around Arbor Hills Nature Preserve in Plano or Bonnie Wenk Park in McKinney, where pest pressure tends to be higher.
| Pest Type | Use Weep Holes? | Why | Prevention Method |
| American cockroaches | Yes | Flatten their bodies to squeeze through small gaps | Breathable weep hole screens + perimeter treatment |
| Spiders (incl. brown recluse) | Yes | Follow prey insects into wall cavities | Weep hole covers + perimeter pest control |
| Scorpions | Yes | Seek dark, sheltered spaces inside walls | Breathable barriers + regular pest treatment |
| Fire ants | Yes | Build trails into wall cavities from soil | Weep hole screens + fire ant control around foundation |
| Mice | Sometimes | Juveniles can fit through gaps as small as 1/4 inch | Steel mesh weep hole covers |
| Wasps & mud daubers | Yes | Build nests inside wall cavities | Screens + seasonal inspections |
A properly sealed and protected perimeter makes a real difference. If the openings aren’t addressed, even the best pest control treatment leaves a gap in your defense.
What Happens If You Cover or Block Weep Holes?
Here’s where many homeowners get tripped up. The instinct is to seal them completely — caulk them shut, mortar them over, stuff them with steel wool and call it done.
Don’t do that.
If you fully block weep holes, you eliminate the moisture drainage and airflow your walls depend on.
So what happens when they’re sealed shut?
Trapped moisture can lead to:
- Mold growth inside the wall cavity
- Wood rot in the structural framing
- Efflorescence (that white chalky residue) on your brick surface
- In severe cases, actual structural damage to framing and sheathing
The goal isn’t just to block weep holes. It’s to protect them without interfering with how they work. That’s the difference between a quick DIY fix and a professional approach.
How We Protect Weep Holes During Pest Treatment
Because weep holes need to stay open for drainage and airflow, proper protection requires the right materials and approach. Our technicians are trained to protect these openings without interfering with how the wall system is designed to function.
At CitiTurf, we include weep hole protection as a standard part of our exterior pest treatment at no extra charge.
Here’s how we handle it:
Step 1: Inspection
Our technicians inspect every weep hole along your home’s foundation during the initial visit. We look for signs of pest activity, debris buildup, and any damage to the openings.
Step 2: Install Breathable Barriers
Not every screen or filler material is appropriate for weep holes. The wrong product can block drainage, trap moisture, or fail to keep pests out.
We install breathable weep hole screens made from stainless steel mesh. These allow airflow and moisture drainage while blocking pests from getting inside.
These aren’t DIY foam plugs or stuffed steel wool. They’re purpose-built barriers designed to protect your home without interfering with how your walls function.
Step 3: Perimeter Treatment
Next, we apply a targeted perimeter pest control treatment around your foundation. This creates a protective barrier that works alongside the physical screens.
It’s the combination of breathable barriers and perimeter protection that delivers long-term results.
Step 4: Documentation & Follow-Up
You’ll know exactly what was done and where. We document all the work performed and recheck weep hole conditions during follow-up visits as part of your ongoing local pest control services to make sure the barriers remain in place and the openings stay functional.
When Should Weep Holes Be Checked or Protected?
It’s best to check weep holes before pest season ramps. In North Texas, that typically means late February through March. Once temperatures consistently reach the 70s, pest activity quickly increases.
Here’s a simple seasonal checklist:
- Spring (March–April): Ideal time for initial inspection and screen installation. Pest pressure is still building, so you can still get ahead of it.
- After heavy storms: Check for debris buildup or displaced screens. North Texas storms can wash soil and mulch into weep holes.
- During routine pest treatments: If you’re on a regular service plan, your technician should be checking these during their visits.
- Before summer peak (May–June): If you missed spring, don’t wait past May. Scorpion, roach, and ant activity spikes as temperatures warm up.
- Fall (October–November): Pests start looking for shelter as temperatures drop. A second check helps ensure everything is intact before overwintering.
If you’re not sure whether your weep holes are protected, walk the perimeter of your home and look along the base of the brick.
Open gaps with no mesh or screen? That’s your answer.
Getting a professional inspection alongside your regular fire ant control or pest treatment is the easiest way to make sure nothing has been missed.
