RPM International Inc.’s Tremco business has acquired Schul International Co. LLC, a manufacturer of joint sealants for commercial construction, and Willseal LLC, a business that markets and sells Schul products.

Both companies will be integrated into RPM’s Tremco Commercial Sealants & Waterproofing business, which specializes in the manufacture of sealants and waterproofing products for commercial, residential, industrial and infrastructure markets.

Schul and Willseal are based in Hudson, N.H., and have combined annual net sales of approximately $15 million. The companies’ leaders, Steve Robinson of Schul and Brian Iske of Willseal, will continue in their current roles with the business units as part of Tremco.

“The acquisition of Schul strengthens Tremco’s position as a global market leader and puts RPM in a leading position for impregnated foam tape technology,” RPM CEO Frank Sullivan said in a statement. “Through this transaction, we are creating a platform for North American-based production, augmenting our product development capabilities and leveraging other synergies that will be further enhanced by our MAP to Growth operating improvement initiative. Schul’s well-recognized brands complement our existing product offering with new solutions, and we intend to drive revenue growth for Schul’s products by leveraging Tremco’s existing sales structure.”

Schul’s product line primarily consists of pre-compressed, self-expanding foam tapes, which are used for sealing vertical and horizontal joints in applications that include window seals, precast concrete, modular construction and concrete façade restoration. They are sold under the Sealtite and Willseal brands.