The Family Store with So Much More

Merwin Mason Supply Co.,Inc. was started in 1970 in an old tobacco barn in South Windsor. It later moved to the Chapel Road location where it is today. The company was started by Merwin Pola and his family with just one small pickup truck. Today we have a large showroom and a fleet of trucks with fork-lift unloaders for fast and safe delivery. We are still a family run company and strive to keep that "small business" quality that that gives you the outstanding, personal service you have grown to know and appreciate for the past 30 years. More...


Don't see what you are looking for? Give us a call or come in to our show room and let us show you how we can help get your project started!

Our showroom and yard pickup hours are:

Monday thru Friday
7:00am - 4:00pm
Saturday 8:00 - 12:00 seasonally (call first).

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Keystone Verazzo

Keystone Retaining Wall Systems


For more than 20 years, Keystone Retaining Wall Systems, Inc. has set the worldwide standard for excellence and innovation within the segmental retaining wall industry. Symbolizing cutting-edge design, performance and aesthetics, Keystone products and services offer the best site solutions for governmental, commercial/ industrial, recreational, public works and residential applications.

 

 

 


Keystone Verazzo StoneKeystone Verazzo Stone

Keystone Verazzo Stone™ is finished on two sides, allowing both 1- and 2-sided project designs. It features a natural stone look without the natural stone price and enhances any outdoor décor with natural colors and textures.

With unmatched strength, stability, and a rugged appeal, Keystone Verazzo Stone is angled and textured on two sides, providing exceptional design versatility to blend with any landscape. Featuring color blends to compliment any outdoor décor, Keystone Verazzo Stone offers Keystone’s proven pin connection system to make aligning units effortless.

 


 

Keystone Standard Structural StoneKeystone Standard Structural Stone

The Keystone Standard Unit is an American original. The product that started the industry is still the industry leader for tall walls and critical structures. The height-to-depth ratio of the Keystone Standard unit delivers a structurally sound, engineered wall system with superior construction stability, durability, and strength. Architects and engineers rely on the Keystone Standard unit to stand strong when the safety and security of their wall designs matter.

 

 


 

Keystone Country CottageKeystone Country Cottage

Whether for castle or home ... graceful curves, monumental corners and terraced walls are all part of the charm of Country Cottage™ by Keystone. Random and rugged, yet blended with color and character, these high strength concrete modules appear as natural stone. Assembly of the varying length Country Cottage units will result in a random layout, with the texture, color and appearance of an old world stone wall.

Come into our showroom and we will show you the entire Keystone product line to suit your project.