About Us

LL Building Products began in 1938 with the founding of Leslie Welding Company in Chicago, Illinois, a small specialty welding company, also involved in making miscellaneous metal ventilation products.

Locke Manufacturing was founded in the 1950’s as a producer of ornamental iron railing and columns, and quickly became a leader in this industry, with the majority of their sales through Sales and distributors.

In 1967 Locke Manufacturing was acquired, merging with Leslie Building Products Company and Leslie Locke was formed manufacturing door accessories, ductwork, ventilation and ornamental iron products. In 1998, GAFMC purchased Leslie Locke Building Products, forming a new Division called LL Building Products Inc. LL Building Products still manufactures the same high quality products. The products offered by LL Building Products are marketed under the Master Flow® and Village Ironsmith™ and brands.

Our parent company, GAF Materials Corporation, was founded in 1886 and is currently headquartered in Wayne, New Jersey, is the most fully integrated roofing manufacturer in the United Stated with over 30 plants across the country and nearly $3 billion in sales.