What Are Egress Windows?
Does My Casper Basement Need Them?
A finished basement can be one of the most cost-effective ways to add more space to your Casper home. It can be an a great area for bedrooms, a family room or a playroom.
As you plan your basement remodeling project, keep in mind you may need to put in bigger windows. Egress windows are large openings that offer an escape route in an emergency. They can also add more natural light and make your basement feel more welcoming.
Basement bedrooms and living spaces must have egress windows. Living spaces can be offices, TV rooms or workshops. This mandate also involves unfinished basements.
Why Are Egress Windows Important?
There’s not a lot of time to flee a house fire. It can become fatal 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, large egress windows are a critical secondary exit.
Basement Windows in Older Homes May Be Too Small
Basements in older homes were not created to be sleeping or living areas. This is especially true for homes constructed before World War II.
Homeowners during that era used this kind of basement for utility space, laundry and storage.
Depending on its age, your home may have preceded modern egress window requirements. Or it may have windows with a tinier opening.
If you have an older home, there’s a good possibility it has skinny windows in the basement. Also known as hopper windows, these above-ground windows open inward to let in fresh air.
But these windows are small—too small for an adult or fully-outfitted first responder to climb through.
How to Measure Your Basement Windows
Uncertain if your present basement windows meet modern requirements? All you need is a tape measure.
- Open the window as wide as possible.
- 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 bigger windows installed.
Requirements for Egress Windows in Basements
Building codes mandate the size of basement windows. This allows for a speedy 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 under ground level, you will need to have a well dug underneath the window frame. This well must be at least 36 inches wide and 36 inches long. If the well is more than 44 inches deep, it will need a fixed ladder or steps.
Using timber or concrete blocks in the well makes it simple to put in steps. Plus, you can incorporate 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 needs to be enough room 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 removable from the inside without keys or tools.
It’s also vital that basement windows can open entirely. The window sash shouldn’t interfere with the opening. This enables your family to quickly exit—or first responders to quickly enter.
Local requirements for basement windows may differ. Check with Casper building officials to learn more about area guidelines.
Choosing Basement Egress Windows
There are several kinds of windows that work well for basements and fulfill building code requirements.
Casement windows are a good option for limited wall space. These windows operate like a door, swinging free to provide a wide opening.
Casement windows open by turning a handle. Pella® casement windows feature a crank that folds away. That way, the crank won't interfere with shades.
This window must have at least 8 square feet of net opening.
Sliding windows are great for adding more light to spacious 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 provide even easier operation.
This window must have at least 16 square feet of net opening.
Talk with the Professionals at Pella of Casper
Basement escape windows are an essential for downstairs living spaces. They can be a lifesaving tool in an emergency. Talk with our professionals at Pella of Casper. We can help when you're updating your basement.
We can also recommend the right window that meets your project, budget and local egress requirements.