G.H. Slack & Son


Weatherization Hardware


We are Columbia Aluminum.  Since 1947 our company has been dedicated to developing, manufacturing and distributing weather-strip/door components and floor covering products to the building industry.

The finest quality materials have been designed for quick and easy installation and a constant evolution is taking place with our products to remain on the cutting edge of current applications and technologies in order to best serve our customers. 


Since 1952, PEMKO has been a key manufacturer in weatherstripping products. Over the years we have expanded our product line into a full line of architectural door trim products to include thresholds, fire/smoke gaskets, door bottoms, perimeter gasketing, brush seals, astragals, continuous geared and stainless steel hinges, fire and life-safety products, lites and louvers, and sliding door hardware.

PEMKO offers sound-tested, smoke-labeled, fire-labeled, skid resistant, and ADA-compliant products, and aggressively pursues new
product development to create solutions for new applications and requirements.