What Are Egress Windows?
Does My Mankato Basement Need Them?
A finished basement can be one of the easiest ways to add more space to your Mankato home. It can be an a great area for bedrooms, a family room or a playroom.
As you prepare for your basement remodeling project, take into account that you may need to put in wider windows. Egress windows are large openings that provide another way out in an emergency. They can also add more natural light and make your basement feel more welcoming.
Basement bedrooms and living spaces are required to have egress windows. Living areas can be offices, TV rooms or workshops. This mandate also affects unfinished basements.
Why Are Egress Windows Important?
Time is limited to get out when there’s a house fire. It can become life-threatening in only 2 minutes and engulf a home within 5 minutes, according to the National Fire Protection Association.
When you only have minutes to leave, big egress windows are a crucial altermative exit.
Basement Windows in Older Homes May Be Too Small
Basements in older homes were not designed to be sleeping or living areas. This is especially true for homes constructed before World War II.
Homeowners at that time used this style of basement for utility space, laundry and storage.
Depending on its age, your home may predate up-to-date egress window requirements. Or it may have windows with a smaller opening.
If you own an older home, there’s a good chance it has narrow windows in the basement. Also called hopper windows, these above-ground windows open inward to provide fresh air.
But these windows are small—too small for an adult or fully-equipped first responder to climb through.
How to Measure Your Basement Windows
Uncertain if your current basement windows meet modern requirements? All you need is a tape measure.
- Open the window fully.
- Measure the width and height of the opening.
- Multiply the width by the height.
Is your measurement equivalent to the required 821 square inches—or 5.7 square feet? If not, you need to have larger windows installed.
Requirements for Egress Windows in Basements
Building codes mandate the size of basement windows. This allows for a fast exit in an emergency.
According to the International Residential Code, basement windows must have:
- An opening width of at least 20 inches.
- An opening height of at least 24 inches.
- A net clear opening of at least 821 square inches—or 5.7 square feet.
- A sill no more than 44 inches off the floor.
What if My Basement Windows are Below Ground Level?
If your basement windows are below ground level, you will need to have a well dug at the bottom of the window frame. This well should be at least 36 inches wide and 36 inches long. If the well is more than 44 inches deep, it will need a permanent ladder or steps.
Using timber or concrete blocks in the well makes it easy to install steps. Plus, you can add a few small landscaping features, like crushed rock or potted plant.
It's all right for basement windows to be under a deck or porch. But there must be enough space for an average-sized adult to escape.
There should be at least 36 inches between the top of the window well and the bottom of the deck or porch joists.
Other Requirements for Egress Windows in Basements
Because basement windows are an escape route, they must open from the inside. Any screens, grilles or bars need to be taken off from the inside without keys or tools.
It’s also essential that basement windows can completely open. The window sash shouldn’t impede the opening. This allows your family to quickly exit—or first responders to quickly enter.
Local requirements for basement windows may be different. Check with Mankato building officials to learn more about area guidelines.
Choosing Basement Egress Windows
There are several styles of windows that work well for basements and satisfy building code requirements.
Casement windows are a good option for limited wall space. These windows operate like a door, swinging free to provide an ample opening.
Casement windows open by turning a handle. Pella® casement windows incorporate a crank that folds away. That way, the crank won't interfere with curtains.
This window must have at least 8 square feet of net opening.
Sliding windows are great for adding more light to large basements. These windows have to be bigger, because the opening is only half as wide as the window. This is due to the sash, which slides horizontally.
Sliding windows open by moving the sash from left to right. Some Pella models include extra-durable tandem nylon rollers. These rollers give even easier operation.
This window must have at least 16 square feet of net opening.
Talk with the Professionals at Pella of Mankato
Basement escape windows are a must-have for downstairs living spaces. They can be a lifesaving device in an emergency. Include our professionals at Pella of Mankato. We can help when you're updating your basement.
We can also help you find the right window that fits your project, budget and local egress requirements.