Siding Company Greenlawn posted by Alpha Windows & Siding September 6, 2016 under Siding Long Island, Windows & Siding Long Island Dutch Lap Siding, Siding Greenlawn, Storm Siding, Windows Greenlawn Alpha is a company that specializes in the replacement of vinyl siding. This home in Greenlawn had its siding replaced with Storm Dutch Lap. All trim was finished in white, while the windows were accented with black shutters.