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GSC/Ryan/ASI & MARSHALLTOWN – The Tools to Tackle Any Challenge

As fellow GMS companies, Gypsum Supply Company (GSC), Ryan Building Materials (Ryan), and ASI Building Products (ASI) are authorized dealers of quality hand and power tools from MARSHALLTOWN® through our construction yards across the Great Lakes region in Michigan and northwest Ohio.


In 1890, Jesse and Lester Williams started a small machine shop on East Church Street in Marshalltown, Iowa, repairing bicycles and automobiles and fulfilling occasional tool orders for local contractors. One local plasterer’s request for a set of custom tools changed the history of the construction tools industry. The Marshalltown Trowel Company was born in 1905 and grew steadily through word-of-mouth raves and mail order – until World War I changed everything again. In 1918, MARSHALLTOWN sent 18,000 trowels to Europe in support of the U.S. war effort. After the war, craftsmen returned home taking their trowels with them and spreading the MARSHALLTOWN name and reputation for quality worldwide.

Marshalltown Trowel changed its name in 2003, now offering over 5,000 products for professionals and do-it-yourselfers in asphalt, brick, concrete, drywall, EIFS, flooring, paint, plaster, stucco, tile, and wallpaper. To its customers and others in the industry, the company is known for unmatched tools, and it is known by one name – MARSHALLTOWN.

Partner with GSC/Ryan/ASI for All Your Construction Tool Needs

Gypsum Supply Company, Ryan Building Materials, and ASI Building Products offer quality hand tools and power tools for a variety of applications, including:

  • Automatic taping tools
  • Acoustical tools
  • Drywall tools
  • EIFS tools
  • Generators
  • Hand tools
  • Lasers and levels
  • Powder actuated tools
  • Power tools
  • Sanding tools
  • Tool accessories
  • Tool parts and repair kits


For Great Lakes area construction professionals in Michigan and northern Ohio, GSC, Ryan, and ASI offer quality building tools and accessories from MARSHALLTOWN, including, but not limited to:

  • EIFS inside & outside corner trowels
  • QLT cornerbead tools
  • Taping knives
  • Finishing trowels
  • Pointing trowels
  • Drywall tapers
  • BS scarifiers
  • Notched trowels
  • Notched squeegees
  • Aluminum hawks
  • Mud pans
  • Pool trowels
  • Cork floats
  • Brick hammers
  • Corner rollers and replacement heads
  • Drywall rasps
  • Bullet CenterFire circular rigid foam blades

MARSHALLTOWN News and Product Updates

Stay up to date with all the latest product releases, improvements, and advancements from Marshalltown.

MARSHALLTOWN® Knockdown Texture Repair Stencils Learn more
DIY Workshop – How to Check Thin-Set Coverage Learn more

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