Single Casement
One side-hinged sash in a rectangular frame. Used for bedrooms, kitchens, offices, and narrow openings where maximum ventilation is desired.
Casement windows are side-hinged operable units that swing outward with a crank, push-out latch, or limited-opening operator. When closed, the sash pulls against compression weatherstripping, which gives casements strong air and water performance compared with many sliding sash designs. They are widely used in bedrooms, kitchens, high-performance homes, and commercial punched openings where full-height ventilation and a clean vertical sightline are priorities.
Product Reference
Anatomy of a Window
Configurations
How It Comes
Applications
Where It's Used
Bedrooms and Egress Locations
Casements can provide a large clear opening relative to frame size, making them useful where emergency escape rules apply.
Kitchens and Counters
Crank operation works well over sinks and counters where lifting or sliding a sash would be awkward.
High-Performance Homes
Compression weatherstripping and multi-point locking can support low air leakage targets.
Narrow Openings
Tall, narrow casements provide more ventilation than many double hung or slider units in the same rough opening.
Selection Guide
How To Specify It
Use these checkpoints when comparing quotes, reviewing submittals, or deciding whether this product type fits the opening.
Frame Material
Wood Casement Window
Wood casements offer excellent interior finish quality and good insulation, with hardware mounted into a rigid sash and frame. Exterior protection may be paint, stain, aluminum cladding, or fiberglass cladding.
Advantages
- Premium interior appearance for visible living spaces
- Strong fastening substrate for hinges and operators
- Good thermal behavior when maintained
Considerations
- Requires finish maintenance at exposed exterior areas
- Operator and hinge screws need solid, dry wood over time
- Higher cost than common vinyl casements
Frame Material
Vinyl Casement Window
Vinyl casements are common in residential replacement work and use welded PVC frames, multi-chamber profiles, and crank hardware mounted through reinforced sash sections.
Advantages
- Cost-effective and low maintenance
- Compression seal can deliver strong air performance
- Broad availability from residential manufacturers
Considerations
- Large sash sizes may need reinforcement
- Hardware attachment quality varies by product line
- Color and exterior finish options are limited
Frame Material
Aluminum Casement Window
Thermally broken aluminum casements provide narrow profiles, strong structural performance, and durable finishes for commercial and design-forward residential projects.
Advantages
- Rigid frame and sash for larger operable sizes
- Slim sightlines and durable exterior finishes
- Well suited to commercial-grade hardware
Considerations
- Requires an effective thermal break
- Hardware and thermal upgrades increase cost
- Condensation risk must be evaluated in cold climates
Frame Material
Fiberglass Casement Window
Fiberglass casements combine low movement, good strength, and premium performance, making them popular in high-performance residential construction.
Advantages
- Stable frame geometry supports long-term seal compression
- Strong sash material handles heavier glazing packages
- Low maintenance compared with exposed wood
Considerations
- Premium pricing and fewer supplier choices
- Heavier units may require more careful handling
- Hardware options depend heavily on manufacturer line
Frame Material
Aluminum Clad Wood Casement Window
Aluminum-clad wood casements pair wood interiors with protected exteriors and are common in premium residential projects where appearance and durability both matter.
Advantages
- Wood interior with low-maintenance exterior cladding
- Wide color selection for exterior coordination
- Strong premium brand availability
Considerations
- Higher initial cost
- Cladding joints and sill drainage must be respected
- Repair can be more complex than basic wood or vinyl
0.17 to 0.34 Btu/hr-ft2-F depending on frame and glazing
U-Factor
0.18 to 0.62
SHGC
Performance & Ratings
At a Glance
Project Coordination
Details To Confirm Early
01
Confirm handing from the exterior
Many window schedules define casement handing from the exterior view. Verify before ordering to avoid reversed operation.
02
Protect operator hardware
Construction dust, stucco wash, and painter overspray can damage crank hardware and hinges. Keep units protected until turnover.
03
Check screen location
Outswing casements usually have interior screens, which affects trim, blinds, shades, and user access.
Product Questions
Common Questions
Are casement windows more airtight than double hung windows?
Often, yes. The sash closes against compression weatherstripping, while double hung windows rely on sliding seals and meeting rails.
Can casement windows meet egress requirements?
Yes, if the unit size, opening hardware, and sill height meet the local emergency escape and rescue opening requirements.
What is the main downside of casement windows?
They swing outward, so they need exterior clearance and durable hinge/operator hardware, especially on large or windy exposures.