Many homeowners and builders search for ways to bring natural light into dark or inaccessible parts of a building. This often leads to the question: What are roof windows called? Navigating the vocabulary of architectural glazing can be confusing, especially with terms like skylights, rooflights, and even sun tunnels. This guide explains roof windows, their proper names, key differences from similar products, and how to choose the right type for your home.
Roof Windows And Related Terms: A Quick Reference Table
| Term | Definition | Common Uses | Key Features |
|---|---|---|---|
| Roof Window | Operable window set flush within a pitched roof | Attics, lofts, converted spaces | Open for ventilation, natural daylight, sometimes egress |
| Skylight | Fixed or vented glazing set in a roof, often non-opening | Hallways, bathrooms, flat or pitched roofs | Admits natural light, may be fixed or opening |
| Rooflight | UK/European term for any glazed roof opening | Roofs of all types | Can be fixed or opening, includes skylights and roof windows |
| Sun Tunnel | Tubular device with reflective lining funneling light from roof to ceiling below | Interior rooms without direct roof access | Brings daylight to dark spaces via a shaft |
Defining Roof Windows: What Are They Called?
The primary term for a window installed in the slope of a roof is roof window. A roof window is an integrated, outward-opening window set into the pitch of a sloped roof, typically at the same angle as the surrounding roofline. The term is frequently used within building codes and construction specifications in the United States and Europe.
Roof windows are designed to provide natural light, ventilation, and sometimes access for egress or roof maintenance. They are distinct from other roof glazing products due to their operability and flush integration into the roof plane.
Roof Windows Versus Skylights: Understanding The Difference
The words “roof window” and “skylight” are often used interchangeably, but there are important distinctions:
- Roof Windows open outward, are typically larger, and are designed to be installed in the same orientation and in-plane with the surrounding roof materials, maintaining the aesthetic continuity of a sloped roof. Many roof windows also meet requirements for use as emergency exits in attic or loft spaces.
- Skylights can be fixed (non-opening) or venting (capable of opening), and can be installed on flat or sloped roofs. Skylights are primarily designed to admit daylight and sometimes fresh air, but may protrude above the surface of the roof or be curb-mounted, especially on flat roofs.
A helpful rule: All roof windows are skylights, but not all skylights are roof windows.
Common Types Of Roof Windows And Glazing Solutions
Top-Hung Roof Windows
Top-hung models open outward from the top, offering an unobstructed view and easy ventilation. These are ideal in low-pitch roofs where maximizing daylight and headroom matters.
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- Excellent for loft conversions
- Improves access and can function as a roof access window
Center-Pivot Roof Windows
These open from a center hinge, allowing the sash to rotate for both ventilation and cleaning.
- Great for pitched roofs
- Easy to operate, even with furniture beneath
Balcony Roof Windows
Innovative units that unfold to create a mini-balcony, expanding usable space and enhancing panoramic views.
- Transforms lofts into light-filled rooms
- High architectural appeal
Fixed Skylights
These non-opening units are designed strictly for daylighting. They cannot provide ventilation but can be larger and adapted to flat or sloped roofs.
Vented Skylights
Designed to provide both light and airflow. They may be manually operated or motorized, often with rain sensors.
Sun Tunnels (Tubular Skylights)
Small diameter, flexible or rigid tubes that funnel sunlight from the roof into interior rooms. Ideal for spaces where a traditional roof window or skylight is not possible, such as hallways, closets, or bathrooms located far from the roofline.
Roof Windows Vs. Rooflights: Regional Language Differences
In the US, the term “roof window” is the most common, particularly in relation to products that meet code standards for emergency egress or roof access. In the UK and much of Europe, the term “rooflight” encompasses all types of windows set into the roof (opening or fixed), with “roof window” used specifically for operable models that sit flush with the roofline.
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“Skylight” in American English tends to be broader, including both operable and non-operable products, and not always installed flush with sloped roofing.
Key Brands And Manufacturers Of Roof Windows
Several prominent companies produce and innovate roof window and skylight solutions. Their products influence building trends and set industry standards.
- VELUX: Known globally for high-quality roof windows, skylights, and sun tunnels. VELUX popularized the modern roof window and is often referenced when specifying these products.
- FAKRO: Major European manufacturer offering roof windows, attic ladders, and sun tunnels with innovative energy efficiency features.
- Andersen and Pella: Major American brands supplying skylights and roof windows suitable for a range of architectural styles.
- Wasco and Sun-Tek: US-based specialists in skylights and daylighting systems for residential and commercial roofs.
Key Uses Of Roof Windows In Modern Homes
Attic And Loft Conversions
A roof window transforms a dark attic or loft into a bright, usable living space. The influx of light and air can make the area suitable for bedrooms, offices, or studios, increasing property value and livability.
Bathrooms And Kitchens
Proper ventilation is vital in rooms with high humidity. A venting roof window or skylight quickly removes moisture while reducing dependence on mechanical exhaust fans, aiding in mold prevention.
Stairwells And Hallways
Central parts of a house, especially those away from exterior walls, benefit from sun tunnels and skylights, making transitions between spaces more inviting and energy-efficient.
Building Codes And Standards For Roof Windows
When considering roof window installation, building codes are critical for safety and compliance. In the U.S., roof windows may be required to meet
- The International Residential Code (IRC) for emergency egress, structural integrity, and energy efficiency.
- Local fire egress rules if the window serves as a potential escape route in habitable rooms.
- Energy Star certification for energy performance in various climate zones.
- Safety glazing standards for glass installed overhead.
Always consult a qualified professional to be sure your roof window system meets local regulations before installation.
Energy Efficiency And Comfort
Modern roof windows can dramatically improve home comfort and sustainability:
- Double or triple-pane insulated glass units minimize heat loss
- Low-emissivity (Low-E) coatings cut solar gain and UV transmission
- Thermally broken frames reduce condensation and cold bridges
- Shades or blinds can be integrated for glare and privacy control
Professional-grade roof windows contribute to lower energy costs and improved indoor climate.
How To Choose The Right Roof Window Or Skylight
Key considerations when choosing a roof window or analogous daylight solution include:
- Roof slope: Most roof windows are designed for pitches between 15° and 90°.
- Opening mechanism: For hard-to-reach spots, electric or solar controls provide convenience and enhanced indoor air quality.
- Size and placement: Thoughtful sizing maximizes daylight without overheating or glare.
- Glazing type: Look for tempered or laminated safety glass. Choose insulated glass for improved thermal performance.
Budget, architectural style, and specific performance needs (egress, ventilation, aesthetics) will guide product selection.
Installation Considerations And Best Practices
Proper installation is key to the long-term performance, energy efficiency, and water tightness of roof windows and skylights.
- Flashing kits are typically required to ensure a waterproof seal around the window unit.
- Alignment with existing roof trusses and rafters ensures structural integrity.
- Professional installation by certified contractors is strongly recommended.
Poor installation can lead to leaks, condensation issues, and roof damage—always prioritize precision and code compliance.
Maintenance And Longevity
Modern roof windows and skylights are designed for durability, featuring weather-resistant seals and materials. However, periodic maintenance is essential:
- Check for debris buildup, which may obstruct water drainage channels.
- Clean the glass with mild soap and water; avoid harsh abrasives.
- Inspect seals and flashing annually to prevent leaks.
- Test opening mechanisms regularly for smooth function.
With routine care, a quality roof window system can outlast standard vertical windows.
Innovations In Roof Windows And Skylights
The industry has seen rapid advancements in recent years:
- Smart roof windows can sense temperature, humidity, and rain, adjusting automatically for comfort and protection.
- Solar-powered operators offer wireless, energy-efficient opening and closing.
- Dynamic glass and specialized coatings allow variable tinting or shading to respond to changing sunlight.
These innovations add value and convenience to any property.
Frequently Asked Questions About Roof Windows
Are All Roof Windows Suitable For Flat Roofs?
Not all. Most roof windows are intended for pitched installations. For flat roofs, use dedicated flat roof skylights or domes designed to shed water properly.
Can A Roof Window Be Used As An Emergency Exit?
Some types can, but check product specifications and local building codes. Egress windows must meet minimum width, height, and opening area requirements.
How Much Does Installing A Roof Window Cost?
Costs range widely based on size, type, and difficulty of the installation, typically between $1,000 and $3,500 per unit inclusive of materials and labor.
What Is The Lifespan Of A Roof Window?
With proper installation and care, a roof window may last 20-30 years or more.
How to Get the Best Roofing Quotes
- Prioritize Workmanship
A roof is one of your home’s most important investments. Always choose a contractor based on experience and reputation — not just price. Poor installation can lead to expensive problems down the road. - Compare Multiple Estimates
Don’t settle for the first quote you receive. It’s always a smart move to compare at least three bids from local roofing professionals. You can 877-801-4315 to get local quotes from roofing contractors in your area, available across the United States. - Use Negotiation Tactics
After selecting a trusted roofer, be sure to use our proven tips — How to Negotiate with Roofing Contractors — to secure the best possible final price without cutting corners.
Summary Table: Popular Roof Window And Skylight Types
| Type | Installation | Best For | Ventilation | Roof Slope |
|---|---|---|---|---|
| Roof Window | Flush in-plane | Attics, habitable lofts | Yes (most) | 15°-90° |
| Skylight (Fixed) | Flat or curb-mounted | Bathrooms, hallways | No | 0°-60° |
| Skylight (Vented) | Flat or curb-mounted | Kitchens, baths | Yes | 0°-60° |
| Sun Tunnel | Flexible/rigid tube | Interior rooms | No | All |
| Balcony Roof Window | In roof, folds out | Loft rooms | Yes | 35°-90° |
Summary: Key Takeaways
- The precise answer to “what are roof windows called” is roof windows, though skylight and rooflight are sometimes used interchangeably, with regional variations.
- Roof windows differ from skylights primarily in their placement, operation, and function within the roof structure.
- Choosing the right solution involves balancing natural light, ventilation, safety, building codes, energy performance, and aesthetic appeal.
- Modern technology has greatly expanded options for daylighting, ventilation, and smart home integration via roof windows and related glazing products.