DGB Roofing - Crystal Lake. Is a local roofing company serving the chicagoland area. DGB Roofing specializes in residential and comercial roof replacements, roof repairs, full gutter replacements and more. DGB is not a sub-contractor, it uses its own certified roofing crew, administration staff and specialized equipment. DGB has a showroom located in Crystal Lake which showcases materials like woodshake, slate, architectural shingles and more