Impact Resistance

Over the years, strict building codes have been implemented in coastal areas to require the use of high-performing products that withstand harsh conditions. Kolbe's impact-certified products provide added security and peace of mind without sacrificing beauty.

In a hurricane or tropical storm, the most damage generally occurs when the envelope of a building is breached by wind-borne debris. This causes a pressure difference between the interior and exterior of the building, and can occur due to window and door damage. For this reason, Kolbe submits its windows and doors to independent organizations which test them to rigorous protocols requiring specific wind loads and types of flying debris.

What makes Kolbe's impact-certified windows and doors stand out from the rest? Kolbe's impact products have the same beautiful appearance for which Kolbe windows and doors are known. No unsightly brackets or visible rods are necessary to hold the sash in place, and no extra locks are needed to fasten when time to evacuate is imminent.

Kolbe's impact certified products

An overview of our impact-certified products is below. For specific product information, including configuration and maximum size tested, please search using our Performance Class & Grade page.


Ultra Series

Crank-out casements & stationary units
(includes radius tops and rectangular mulled units)
IPD4 yes
Push-out casements (includes radius tops) IPD4 yes
Crank-out awnings (includes mulled units) IPD4 yes
Sterling double hungs & stationary units IPD4 yes
XL Sterling double hungs IPD4  
Majesta® double hungs & single hungs IPD4  
Ogee direct sets IPD4  
Tilt-turns mulled to stationary units IPD4  
Garden-Aire sliding patio doors & stationary panels IPD4  
TerraSpan® lift & slide doors IPD4  
Folding doors IPD4  
Inswing French doors IPD3  
Sidelites to match Inswing doors IPD4  
Outswing doors, stationary panels & transoms
(includes radius tops and rectangular mulled units)
IPD4 yes

Heritage Series

Kolbe has numerous products that are impact certified; for specific information on the products that meet requirements, please contact your local distributor.

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