StormForce Series — Loewen Windows

StormForce Series

Loewen StormForce Products take the performance of our beautiful handcrafted windows and doors to the utmost. These impact-rated pieces have been tried and tested in extreme real-world conditions.

StormForce Series

Tried and True

Born out of an unfortunate necessity, our StormForce Series has been put to the test multiple times in coastal regions like the South Eastern US and Caribbean.

Maximum Protection for Coastal Environments

We offer you fenestration structurally enhanced to meet – and exceed – International Residential Code, Florida Building Code and other Coastal requirements, including the stringent Dade County certification. Each test is conducted by an independent agency, based on extreme conditions and varying product sizes. Code compliance is a fundamental aspect of Loewen design and engineering.

Available on Casement, Awning, Picture/Direct Set, Specialty Windows, Double/Single Hung, Patio Doors, Terrace Doors and LiftSlide Doors


  • Maximum coastal protection – purposely designed to withstand all of nature’s harshest elements – hurricanes, tropical storms, high winds, driving rain, sweltering heat and freezing cold
  • Unseen structural upgrades– no unsightly brackets and/ or locks commonly seen on coastal products
  • Versatile and enhanced styling – Coastal Douglas fir wood interior standard with the choice of extruded aluminum cladding
  • Optimal thermal performance – LowE insulated glazing, laminated, and reflective glazing options which provide comfort, shading, and peace of mind

Related Documents

Brochures and Technical Guides related to this product.

StormForce Technical Guide

Impact Glazing

Windborne wreckage can impact homes during windstorms and hurricanes, with gusting, pervasive winds to follow. To protect the integrity and interior of homes, windows and doors must resist penetration and remain in place and intact. Impact designed laminated-glass windows and doors pass windborne debris impact tests, and even when broken, the glass fragments remain integral, adhering to the plastic interlayer, to preserve the building envelope.

With impact products rated up to DP 85, Loewen’s superior design is able to withstand 9,000 cycles of positive and negative wind loading, 105 psf structural loading and the impact of a D-Missile*.

* D-Missile certified products are tested to withstand impact from a 9 pound 2 x 4 stud, 8 feet in length, at an impact speed of 50 feet/second. Products are then tested to withstand 9,000 positive and negative wind loading cycles without failure of the building envelope.

Laminated Glass

All Loewen StormForce products use industry leading laminated glass produced by bonding a combination of plastic vinyl layers and polyester film between two panes of glass into a single sheet. Laminated glass has the look of ordinary glass but offers a fortification against accidental impact, forced entry, sun damage and noise that far surpasses that of standard glass.

Glazing options on Impact products include PVB and SGP in clear layers. Also available is a LoE3 coating which helps reduce solar heat gain while being virtually invisible.

Building Codes

StormForce frames and IG units are weather proof against all water and air infiltration and the energy efficient design meets specific regional building codes for U-Values in coastal areas from New York to Texas.

Florida Building Code

The Florida Building Code is the strictest code in the United States for resistance to wind-borne debris and wind-loading for fenestration products. Many Loewen certified products meet high velocity wind zone 4 standards.

For more information on sizes, drawings and options:

View Our Technical Guide →

StormForce Double Hung Windows

  • Loewen Double Hung window has been designed to complement the depth and character of the traditional North American home. We’ve combined superior strength and durability with maximum coastal protection and innovative efficiency options to deliver a window that not only matches the look of your residence, but also delivers the progressive performance it deserves
  • Innovative balance system allows windows to open and close smoothly
  • Integrated structural sill block and metal nailing flange allows for enhanced moisture management and maximum protection against water infiltration
  • Thermally broken aluminum sill and glazing options for maximum energy efficiency
  • Heavy meet rail improves performance when struck by a D-Missile
  • Interlock system and integral sill block details enhance the structural integrity of the window
  • Flexible bulb weather seal for optimal performance

StormForce Terrace and French Doors

No other hinged door performs in coastal environments like a Loewen Terrace door. Traditional and French. Traditional Terrace doors hinge on the jamb so that one panel is fixed and the other operates. By contrast, French Terrace doors are hinged on both jambs to allow both doors to operate from the middle. Inswing and Outswing versions of both styles are available as additional protection options.

  • Handle-activated stainless steel head and sill shoot bolts are standard with StormForce series. Additional lock points increase structural air/water performance and provide added security
  • Insulated sealed unit provides energy efficiency as well as impact resistance
  • Stainless steel support plates on top and bottom panels enhance structural integrity
  • Thick interlayer designed to resist Zone 3 D-Missile impact
  • Utilizes five-point stainless steel locking system, stainless steel strike plates and a sturdy astragal for superior impact performance
  • Tall sill enhances protection against water infiltration

StormForce Sliding Patio Doors

Functioning like large moving windows, Loewen Sliding Patio doors can open up the walls for larger living space. StormForce doors are weatherproof, safe, secure and easy to operate. Loewen uses laminated sash construction, thick, tempered safety glass and smooth tandem rollers. For added protection, Loewen builds an anti-lift device into every patio door. An optional foot lock is also available, as is manual three-point hardware.

  • Anti-lift device
  • Zero clearance required
  • Standard integral sliding screens available
  • Standard multipoint locking hardware & foot lock mechanism
  • 2 1/4” thick sliding panels
  • Silicone-treated, woven pile and foam-filled Q-lon weatherstripping system

StormForce LiftSlide Doors

The Loewen LiftSlide allows expansive glass panels to roll smoothly and easily during operation. With the touch of a hand, the LiftSlide mechanism rotates down to seal against water infiltration. LiftSlide Doors can be located in areas of extreme exposure where homeowners want a coastline, mountain or lakefront vistas with minimal sightline interference.

With the high structural integrity and performance of LiftSlide doors, only raised threshold is available in StormForce.

For superior water protection an additional sill riser is available. LiftSlide rails and stiles are comprised of an aluminum/wood hybrid.

Opening panels are equipped with 3G corrosion resistant stainless steel wheel assemblies with flat deformation resistant wheels and precision bearings. Aircraft grade aluminum extrusions with VG Douglas Fir Interior (Mahogany option available).

  • Aluminium Corrosion resistant track with integral drains
  • Robust hardware handles a maximum weight of 850 lbs per panel maximum panel size with laminate glass is 60” (1524 mm) wide or 139 9/16” (3545 mm) tall and 50 square feet of glass