FIRM-FILL® Gypsum Concrete

Featured Application: Wilderness on the Lake, Lake Delton, WI


Owner:Stevens Construction
Project:Wilderness on the Lake
Floor Assembly:Tongue & Groove
Square Footage:180,000 Square Feet
Application:FIRM-FILL® Gypsum Concrete over sound mat
Applicator: Gypsum Floors, Inc.

Waterfront recreation and relaxation in Wisconsin is synonymous with picturesque Lake Delton, the number-one family vacation destination in the Midwest. Centrally located between Chicago and Minneapolis, the growing community is comprised of resorts, golfcourses, spas, water-parks and waterfront recreational facilities. And, now, pristine Lake Delton is home to a new $37 million, 108-unit luxury condominium complex thanks in part to Gypsum Floors, Inc. and FIRM-FILL Gypsum Concrete.

General Contractor, Stevens Construction was looking for the highest quality floor underlayment for the upscale condo units. Gypsum Floors, Inc., a Licensed Applicator of Hacker Floor Underlayments, provided Stevens Construction with the perfect solution - FIRM-FILL Gypsum Concrete.

Gypsum Floors, Inc. worked tirelessly to deliver a quick and efficient installation of FIRM-FILL Gypsum Concrete which gave the condos superior sound control, high compressive strengths and a smooth, flat surface ready for virtually any finished floor covering.

FIRM-FILL Gypsum Concrete is a high quality, versatile and durable solution for new construction, renovation and repair providing a lightweight, shrinkage, crack-free underlayment. FIRM-FILL Gypsum Concrete also provides increased fire resistance and compressive strengths up to 2000 psi.

The job required Gypsum Floors, Inc. to take more than 33 trips spanning two months to the resort. "To meet the tight construction deadline, we had one day where we installed over 1,100 bags of FIRM-FILL Gypsum Concrete with two crews pouring in two separate areas," said Adam Grosse, project supervisor of Madison, Wisconsin-based Gypsum Floors, Inc. "The dynamic communication and cooperation between Hacker Industries, Inc, Gypsum Floors, Inc., and Stevens Construction was essential to our ability to install the product within the timetable provided." In the end, they poured 180,000 square feet of FIRM-FILL Gypsum Concrete at a thickness of 1 1/2" over 3/4" T&G and 1/4" sound mat.

Serving the Southern Wisconsin and Northern Illinois areas, Gypsum Floors, Inc. specializes in offering FIRM-FILL Gypsum Concretes and GYP-SPAN Radiant for apartment and commercial projects. With more than 15 years experience installing Hacker Floor Underlayments, Gypsum Floors, Inc. has become the applicator of choice among architects, builders and developers who demand quality and service.

Hacker Industries, Inc. supplies six cementitious floor underlayment products designed to meet the most demanding project specifications over virtually any subfloor surface in new construction, renovation and repair. For more information about Hacker Floor Underlayments or for a Licensed Applicator in your area, contact Hacker Industries, Inc. at (800)642-3455, please visit us at or e-mail

To reach Gypsum Floors, Inc., contact Adam Grosse at (800) 524-5863.

With excellent STC and IIC ratings as well as over 86 UL listings, FIRM-FILL® Gypsum Concrete is one of five superlative gypsum concrete floor underlayments supplied by Hacker Industries, Inc. Hacker floor underlayments are known industry-wide as the highest quality and most cost-effective products available.