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How To Get Rid of Attic Condensation For Good?

How To Get Rid of Attic Condensation For Good?

Attic condensation is one of the most common problems reported by homeowners across the US, but in particular where it rains more frequently. It can often lead homeowners to assume that they have a roof leak, but that turns out to be an incorrect assumption when they can’t find it. This makes them think that the root of the problem has to be elsewhere.

As for the problem? Most likely, that’s attic condensation. The fact is that attic condensation can be caused by a variety of problems, including torn or non-existent insulation and air leakage.

In this article, we’ll discuss how to identify and quickly address problems with attic condensation.

How To Identify Moisture in Attic?

The easiest way to identify attic condensation, if you don’t already feel it in the attic space, is to do the following:

  • Check for the buildup of ice or frost across the roofing nails. If there is ice, then you have a condensation problem.
  • Check for rust. Usually, the first to rust will be the roof nails inside the attic.
  • Do you see any dark stains on the roof boards? If you do, then that’s another indicator of moisture in the attic.
  • Check the roof sheathing for moisture.
  • Do you see drip marks on the attic floor or perhaps across the insulation?
  • Examine the sheathing and look for any signs of damage.
  • Simply touch your attic’s insulation. If it feels wet, you might have a problem with attic condensation.
  • Check for the onset of mold in the attic – it’s a sign that there are problems with humidity.

All these are telltale signs that you have a condensation problem in the attic. However, before you try to address the problem, you need to start with an understanding of how it got there.

How Does Attic Moisture Enter The attic?

Condensation can enter an attic in several ways. Still, it typically happens when warm, moist air from inside the home rises into the attic, where it becomes colder, like when it reaches the underside of the roof or the attic floor. The warm, moist air gradually condenses into water droplets, damaging the attic and the rest of the home if left unchecked.

Some common ways that warm, moist air can enter the attic include but not be limited to the following:

Poor Ventilation

If there isn’t enough ventilation in the attic, it can become too hot and humid, creating the ideal conditions for condensation. You will want to work with an expert builder to find ways to improve the ventilation in the attic.

Inadequate Attic Insulation

It is the most common reason for condensation. If the insulation in the attic is insufficient or damaged, it allows warm air to escape from the living space below and enter the attic. As soon as that happens, you have a condensation problem.

Air Leaks

Gaps and cracks in the ceiling or walls of the home can allow warm, moist air to get into the attic. This can lead to issues not limited to the attic but affect other parts of your home. In some cases, this may be caused by poor attic insulation – or may simply happen in the ones that are aging.


Do you have humidifiers in your home? They can release excess moisture into the air, which rises into the attic. While we aren’t against using humidifiers, you should be able to insulate the attic so that air from the device does not reach it.

Can Moisture Also Rise From The Basement?

It is possible for moisture to rise from the basement during winter when the heating system is turned on. If there is water in between where the heating system is located and the attic, it turns into steam and goes into the attic, where it condenses into water droplets.

It is worth noting that moist air is far less dense than regular dry air; this makes it easier to escape through any small holes and cracks in the attic. This means if the upper floors of your home aren’t properly sealed, the air will escape, and that will decrease the home pressure.

Later, you have a fresh stream of air rising from all the lower portions of the home, like the basement. When stacked together, the negative pressure and buoyancy of the air will cause the warm moist air to reach the roof deck, which is cooler. This is where the cold air will start condensing back into water or condensation, depending on the temperature.

Common areas from where air could escape are:

  • Unsealed access to the attic
  • Gaps in the interior or the exterior wall
  • The pull-down stairway to the chimney
  • Holes made for plumbing and electrical work

Air infiltration leads to a loss of heat, which also means the cost of heating your home increases. This is one reason you will notice inflated bills, in addition to a moisture build-up in your attic. So, the best way to remedy the situation would be to reduce air leakage.

How To Prevent Condensation From Entering The Attic?

If the current state of your attic is subpar, a professional may recommend improving ventilation to prevent condensation. Proper ventilation can improve air outflow, consequently lowering the temperature in the attic. But low temperatures can cause condensation and decreases the effectiveness of insulation.

The best way to prevent moisture buildup in the attic is to address the source of the problem. For example, if water penetrates the foundation, installing gutters and downspouts and keeping them clean can help. Ensure that the gutters are cleaned multiple times a year if it rains a lot in your area or if you have trees nearby.

However, as we’ll discuss in the next section, there are a few things you can do to get rid of attic condensation so that it does not return anytime soon. That said, the solution or combination of solutions you decide on will mainly depend on the root of the problem.

How To Get Rid of Condensation So That It Never Returns?

Usually, getting rid of attic condensation for good requires a multi-step approach that addresses the root cause or causes of the problem. Usually, there is more than one reason for attic condensation; thus, a multi-pronged approach is the best way to eliminate the problem for good.

Here are some steps you can take:

Insulate Your Property

Proper insulation is key in keeping your attic warm and dry. Check the attic’s insulation for any damage or if it is even missing. The type and amount of insulation you need will depend on your home’s age and the prevailing climate. Ideally, you will want to work with an insulation specialist to find and install the right one.

Foreman in overalls working with rockwool insulation material

Seal Air Leaks

Air leaks in your attic allow warm and moist air from your living space to enter the attic, leading to condensation. Seal any gaps or cracks in your attic floor, ceiling, walls, and around vents. You also want to seal off all pipes using caulk or foam insulation. In addition, make sure to check for roof leaks.

Control Humidity

High humidity levels can contribute to condensation in the attic. This is especially true if you live in an area that’s wet most of the year. Use a dehumidifier to reduce humidity levels, and avoid using humidifiers excessively.

Address Any Roofing and Plumbing Issues

Water leaks from your roof or plumbing system can contribute to attic condensation or compound to make it worse. Usually, floor moisture can rise up when the heating system is running and enter the attic. Ensure your roof is in good condition and immediately repair any leaks or damage. Make it a point to inspect your plumbing system regularly but address any leaks or issues immediately.


There is more than one way to eliminate attic condensation, as we’ve examined in this article. How you decide to get rid of it mainly depends on what is causing the problem. So, for instance, if the problem is caused by the humidifier running on the ground floor, then the insulation will need to be improved. If the condensation occurs during winter, then it could be the warm moist air that’s the problem.

In most instances, it is best to hire a professional to examine the problem and provide possible solutions.


Q. What If I Discovered a Wet Attic?

A. Detecting moisture in an attic can be indicated by various signs, such as the rotting of roof sheathing, noticeable water stains or mold growth on the sheathing, rafters or trusses, and compacted or stained insulation caused by water or ice. A moldy odor may also permeate the house in summer.

Although increasing attic ventilation is often the first response, it can exacerbate the problem by drawing more moist air from the house. Instead, the most effective solution is to seal air leaks and prevent air movement from the house. In a heated house, the air is drawn in from the bottom and expelled at the top, similar to a chimney. Air leaks can be found at penetrations or discontinuities, such as pot lights, bathroom fans, plumbing stacks, chimneys, electrical wiring, or cable installations, and around the house’s perimeter. Sealing these areas can save on energy costs and prevent attic damage.

In older homes, removing insulation from each joist bay and sealing all discontinuities can provide the most thorough air sealing, but simply addressing obvious leaks can still be effective. Additionally, it’s an excellent time to consider adding more insulation to the attic, ensuring at least 300mm of loose insulation or batts. The insulating quality of fiberglass, rock wool, and cellulose is similar, and all work well in attics.

Q. What Are The Most Common Signs Of Attic Condensation?

A. Common signs of attic condensation include the presence of mold, rust, damp wood, wet insulation, buckled, wet sheathing, and a musky odor. If you notice any of this in your attic, it would be worth further investigating to address the problem ASAP.

Q. Is Moisture In The Attic Normal?

A. Moisture in the attic can be somewhat normal, as attics can be susceptible to moisture buildup due to temperature and humidity changes. However, excessive moisture in the attic can damage the roof, insulation, and other structural components. Prolonged moisture can also lead to mold growth, which most people know is a health hazard. It’s essential to regularly inspect the attic for signs of moisture, such as water stains, mold growth, or musty odors. Plus, address any issues promptly to prevent further damage.

Q. What Is a Good Humidity Level For The Attic?

A. A good humidity level for an attic is typically below 60%. Ideally, the humidity level should be between 30% and 50% to prevent the growth of mold and mildew. High humidity levels in the attic can lead to condensation, damaging the roof sheathing, insulation, and other building materials. To maintain a good humidity level in the attic, it is essential to ensure proper ventilation and insulation. You should also hire a professional to address any air leaks or sources of moisture in the area.

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