23 Thursday, 2023

Why Weep Holes Are Important

Sometimes you look at a brick wall and think it is a beautiful and solid structure, except that there are some strange-looking holes in it. You wonder if the mason made a mistake while creating it or if it is intentional. These are called weep holes and play an important role in constructing masonry walls such as stone, brick, stucco, and concrete block.

At D’Angelo and Sons, we understand the importance of brick repair in Hamilton and weeping holes and can explain why they are needed in masonry structures. We can also inspect your walls to make sure weep holes are not blocked, and your structure is sound.

What Are Weep Holes?

Those holes you spot are actually called weep holes, and they play an important role in ensuring the integrity of your structure. Weep holes are tiny masonry openings roughly the size of a mortar joint. They can be found around the exterior of a brick home near the foundation wall and around windows and doors.

They allow for water to escape from walls so that moisture does not become trapped inside, which can lead to serious problems like mold and mildew growth, as well as structural damage. They also provide ventilation for the masonry, helping to preserve its life.

What is The Purpose of Weep Hole Installation?

Water is always looking for a way to move. Weep holes are very important in helping water find its way out of the walls. When it rains, water can accumulate around windows and doors, finding its way into cracks or crevices in the masonry. If the weep holes were not there, this water would be trapped inside the wall and could eventually cause significant damage. By having a weep hole, the water is able to escape and not accumulate in the walls, which can save you from costly repairs.

The importance of weep holes cannot be overstated as they are essential for keeping walls dry and preventing moisture from entering the internal wall cavity. Without them, you would be at risk of costly repair bills and health risks due to mold and mildew growth. Weep holes are important in providing drainage and ventilation, so they should not be blocked or covered up. If you find them blocked with paint or caulk, removing the material and allowing the weep holes to do their job is important.


Flooding, capillary action, condensation, and damage are some of the ways water enters your internal wall cavity. When this happens, the water has to go somewhere, or else it will cause damage to the surrounding area. With weep holes, you can prevent this from happening since they allow water to drain out of the walls instead of getting trapped inside.


When you leave your wall without ventilation, dampness, mildew, and dry rot can build up. If left unrepaired for too long, this can cause your wall to rot and eventually fall apart. Weep holes help to provide ventilation for the walls, preventing moisture from getting trapped and helping the walls stay in good condition for longer.

What Happens If You Block Weep Holes?

If weep holes in stone masonry are blocked or stopped up, moisture can build up in the walls and create a perfect environment for mold and mildew growth. This can lead to health risks as well as structural damage. Blocked weep holes can also lead to an increased risk of flooding and can cause the wall to rot faster.

Problems with Weep Holes

Despite their numerous benefits, weep holes in brick can also present some problems. They can be a source of unwanted pests such as rodents and insects or even birds looking for shelter.

Pest Entry

Leaving weep holes without protection can be an easy way for pests to gain entry into your home. Rodents and insects can use them as a way to get in and set up their nests, while birds may look at them as an easy place to build their homes. Bees and wasps have also been known to build their nests in weep holes.

Some homeowners cover up their weep holes with paper, plastic, or steel wool to prevent this. While these keep pests out, they prevent adequate ventilation and drainage and can even cause greater problems. The best option is to have weep hole covers or guards with holes big enough to allow for sufficient ventilation.

Termite Entry

Another problem that weep holes can cause is termite entry. Termites usually look for small cracks and crevices in the masonry to gain access. Since weep holes are just that, they provide an easy way for termites to enter a home and wreak havoc on its structure. To avoid this, you should install Weepa’s Termite Protector Weep Hole Screen. It is made from bifenthrin-infused plastic, and evidence shows it can keep termites away for up to 2 years. It also keeps cockroaches and ants away from your building’s weep holes. The Weepa’s Termite Protector Weep Hole Screen, when used along with some stainless steel weep hole screens, can protect from bushfires.

Embers and Sparks Entry

If you live in an area that is prone to bushfires, weep holes can also be a source of entry for embers and sparks. If this burning debris gets into the wall cavity, it can cause extensive damage. You should install ember screens over your weep holes to protect your home from this risk.

Types of Damage Caused by No Weep Holes in Brick Homes or Wrong Installation

If weep holes are absent or not installed correctly, they can lead to a variety of problems. These include efflorescence, spalling, rusty and sagging lintels, and internal water problems.


If your building doesn’t have weep holes, water would just sit in the wall and evaporate through the surface of the bricks, leaving behind mineral salts. This is known as efflorescence, and it can create a chalky residue that covers the surface of your walls.

Spalling Brickwork

Once efflorescence occurs, it can lead to spalling brickwork. This is when the mortar starts to break away from the bricks, causing them to crack and crumble, further deteriorating the overall look of your building.

Rusty and Sagging Lintels

The function of steel lintels installed over doors and windows is to support the weight of the brickwork above. If there are no weep holes, water remains on the lintels and causes rust. This can cause the lintels to sag and eventually fail, resulting in structural damage to your building.

Internal Water Problems

Without weep holes, water will accumulate within the wall cavity, leading to various problems. These include mold growth, rotting wood, condensation on windows, damp walls, and even flooding.


In conclusion, weep holes are an important part of any masonry wall structure. They provide a crucial function in allowing water to escape from the walls and preventing it from becoming trapped inside. They also help with ventilation and prevent damage caused by flooding or condensation build-up. However, they can present some risks, as well. Pests can gain entry through weep holes, and using the wrong kind of cover or guard can prevent adequate ventilation. Weep holes in construction also provide an easy way for termites to enter a home, and sparks from bushfires can cause damage if left unprotected. To protect against these risks, you should use appropriate weep hole covers and guards such as Weepa’s Termite Protector Weep Hole Screen and ember screens. With the right measures in place, weep holes can be an effective way to help protect your home.

The benefits of having proper weep hole systems far outweigh the risks, making them a necessary part of any masonry wall. The right precautions can help protect your home from water damage and pests while allowing for adequate ventilation. They are an essential part of any home’s structure and should be taken seriously to ensure the safety and longevity of your building.

Get Expert Weep Hole Installation and Protection Today

If you have any questions about weep holes or need assistance installing them or their covers in your masonry wall, contact the professionals at D’Angelo and Sons today. We specialize in masonry construction and can provide all the materials and advice you need to ensure your weep holes are properly installed. Feel free to contact us today at [phone] for more information! Thank you for choosing our team as your masonry expert. We look forward to helping you protect your home with the right weep hole systems.

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