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Thresholds/Gasketing
At National Lock Supply, we offer a comprehensive selection of door thresholds and gasketing products designed to seal gaps, reduce energy loss, and protect your doors from the elements. From heavy-duty saddle thresholds for high-traffic entrances to precision weather stripping and door sweeps, our products are built to perform in demanding commercial environments. Whether you're replacing worn-out seals or outfitting a new build, we carry the brands and profiles you need to get the job done right.
Frequently Asked Questions
What is the difference between a threshold and a gasket?
A threshold is a raised or flat strip mounted at the bottom of a door opening to bridge the gap between the door and the floor. A gasket is a flexible or compressible seal that closes the gap between the door and the frame on the sides or top. Both work together to create a tight seal.
What types of thresholds are available?
Common types include saddle thresholds, flat thresholds, interlocking thresholds, and adjustable thresholds. Saddle thresholds sit across the floor and the door closes against them, while flat thresholds provide a flush transition between surfaces.
How do I choose the right threshold for my door?
Consider your door type (single, double, sliding), traffic volume, interior or exterior use, and the gap you need to seal. For heavy commercial use, opt for an aluminum or bronze saddle threshold with a durable seal strip.
What materials are thresholds made of?
Commercial thresholds are most commonly made from aluminum, bronze, or stainless steel. Each material offers different levels of durability, corrosion resistance, and aesthetic appeal depending on the application.
Can I install a threshold myself?
Many flat and saddle thresholds are DIY-friendly, especially replacements. However, for new construction or complex installations involving weather stripping systems, professional installation is recommended to ensure a proper seal.
Do thresholds work for both interior and exterior doors?
Yes, but exterior thresholds must be rated for weather exposure. Look for products with waterproof seals and corrosion-resistant materials. Interior thresholds can be lighter duty and focus more on bridging the transition between surfaces.