How to Stop Water Coming Through Garage Wall?

Water coming through the garage wall is a common problem that can cause a variety of issues if left unaddressed. It can be caused by a variety of factors, such as poor drainage, foundation issues, cracks, or damage to the wall itself.

If water is allowed to seep through the garage wall, it can cause damage to the structure of the garage, as well as any stored items that may be inside.

Water damage can weaken the structure of the wall and create an ideal environment for mold and mildew to grow, which can further damage the wall and potentially pose a health hazard.

Why You Should Address Problems Quickly?

There are several reasons why it is important to address the problem of water coming through the garage wall quickly. Let me elaborate on this.

Structural damage

Water infiltration can lead to damage to the garage’s structure, including the walls, floor, and ceiling. This can weaken the integrity of the garage and make it more susceptible to collapse or other forms of damage.

Damage to stored items

If you store items in your garage, they may be at risk of damage due to water infiltration. This can be especially concerning if you store valuable or sentimental items in the garage.

Mold growth

Water infiltration can create a breeding ground for mold, which can be harmful to your health and the overall structure of the garage. Mold can also be difficult and expensive to remove once it has taken hold.

Pest infestations

Water infiltration can also attract pests, such as insects and rodents, which can further damage the garage and be a nuisance to deal with.

By addressing the problem quickly, you can prevent further damage and avoid the potential costs and hassle of repairing or replacing damaged items or structures.

Reasons for Water Coming Through the Garage Wall and How to Fix

To identify the cause of the problem, you’ll need to examine the wall and surrounding areas to see if you can spot any obvious signs of what’s causing the water to seep through. Some potential causes of water coming through a garage wall and how to fix them are given below.

Clean gutters and downspouts to prevent clogs

Clogged gutters and downspouts can cause water to overflow and accumulate against the garage wall. Make sure to clean out debris from the gutters and downspouts regularly to prevent clogs and ensure that water flows freely away from the building.

If the water is coming from the roof, you can use a downspout extension to redirect the flow away from the garage or you’ll need to repair or replace them.

Make sure to use high-quality materials and hire a professional to ensure that the repairs are done properly. This can help prevent water from accumulating against the wall and seeping through the foundation or other openings.

clean gutters and downspouts

Repair any damaged flashing or plumbing leaks

Flashing is a thin strip of metal or other material that is used to seal the joints between the roof and the wall. Water can leak into the garage through the gap if the flashing is damaged or missing. So you should carefully fill all gaps including the wall and ceiling.

Make sure to inspect the flashing and repair any damage as soon as possible to prevent water from entering the building.

If the water is coming from a plumbing issue, you’ll need to locate and repair any damaged or leaking pipes as soon as possible. Then you should go for a professional plumber.

Seal cracks in the foundation or install a waterproofing system

Water can also come through the garage wall if there are cracks or holes in the wall itself. Look for any visible damage or imperfections in the wall.

If the foundation of the garage is damaged or settling, it can cause the walls to crack or shift, allowing water to come through. If it is found then you’ll need to seal the cracks or install a waterproofing system to prevent them from entering the garage.

Waterproofing systems can be applied to the exterior of the building or the interior walls and floor. Sealing the foundation can be done using a variety of products, such as concrete repair caulk, foundation sealant, or epoxy.

Make sure to follow the manufacturer’s instructions and take necessary safety precautions when applying the sealant.

Raise the grade around the garage

If water is not properly drained away from the garage, it can seep through the wall. Look for evidence of standing water or puddles near the garage, or check to see if the ground slopes towards the garage.

If the water is coming from the ground and accumulating against the garage wall, you may want to consider raising the grade around the building. This can help to divert the water away from the garage and prevent it from entering the building.

Use a tarp or plastic sheeting to cover the area

This can help to prevent water from entering the garage through holes or cracks in the wall. Make sure to secure the tarp or plastic sheeting firmly in place to prevent it from being blown away by the wind.

Install a sump pump or replace the garage wall

If the water is coming up through the floor, you may want to consider installing a sump pump to remove it from the garage. A sump pump is a device that pumps water out of the building and away from the foundation.

In some cases, the best solution may be to completely replace the garage wall. This is typically a more expensive option, but it may be necessary if the wall is severely damaged or if the other solutions are not effective.


If you notice water coming through the garage wall, it’s important to address the problem promptly to prevent further damage and protect your belongings.

Ignoring the issue can lead to more serious problems down the line, so it’s important to take action as soon as possible. If you are unsure about how to fix the problem or if the repairs are beyond your skills and experience, it is advisable to consult with a professional.

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I am Ramiro Garcia, founder and author of Garage Ever with a love of all things space. I have created this blog to share resources everything related to auto care and garage. I have a garage and parter with my friend and we started this as a hobby and now it’s our full-time job. I love what I do and enjoy sharing that with you.

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