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Put Scotchgardโ„ข Protector to Work for Your Roof

There is no denying what effect the passage of time will have on your home. Roof age can be apparent when unsightly black streaks caused by algae appear. Roof replacement is a considerable investment of time and money and Malarkey shingles featuring Scotchgard™ Protector can help prevent those black streaks and keep your roof looking beautiful longer.

A Trusted Brand

Since 1956, Scotchgard™ Protector has been a name you can trust. The first version was discovered by 3M research chemist Patsy Sherman in a fortuitous accident where a bottle of synthetic latex spilled onto an assistant’s shoes. She was fascinated that the invisible layer was resilient to solvent removal and repelled water and other liquids. Several decades later the Scotchgard™ Protector brand extends its promise to protect in a variety of solutions from sprays that repel water and block stains on fabric, furniture, carpet and automotive interiors to paint protective films that preserve the showroom quality finish on your vehicle. For roofing, Malarkey shingles featuring Scotchgard™ Protector help prevent black streaks caused by algae allowing the beauty of your roof to shine through, protecting what you love. 

A Strong Formula

Shingles are susceptible to black streaks caused by algae, especially in humid climates. 3M scientists have solved this problem with the proven protection of Scotchgard™ Protector. Malarkey shingles featuring Scotchgard™ Protector are manufactured with a scientifically proven concentration of copper-containing roofing granules to provide sufficient coverage of copper ions over the entire surface of the shingle, inhibiting the growth of the algae that causes black streaks. The solution was developed by 3M over 20 years ago, and was assigned the Scotchgard™ Protector brand in 2002. Malarkey produced the first shingle with 3M Algae Block in 1994 and was the first manufacturer to receive the Scotchgard™ Protector brand designation for algae resistant shingles in 2003.  

3M research shows that a minimum of 10% copper-containing granules, uniformly distributed across both the shingle surface and the hip & ridge, help prevent black streaks cause by algae. All Malarkey shingles featuring Scotchgard™ Protector are tested by a third-party laboratory to ensure they contain a minimum 10% copper-containing granules. 

A Steadfast Connection

The decision on what shingles to buy for your roof can be complex. By selecting Malarkey shingles featuring Scotchgard™ Protector, you can enjoy a roof free from black streaks for up to 20 years. The original style and beauty of the shingles you select is protected by a brand you can trust.


The following shingles are available with Scotchgard™ Protector. Learn More:

Architectural Shingles

Legacy® XL

Legacy® shingle line


Designer Shingles

Windsor® XL