D/Knows Exterior Construction provides quality roofing installation and repair service to homeowners in Clinton County, Illinois. Our family owned and operated business understands the importance of experience, and we serve as 5th generation contractors in Southern Illinois with 21 years of experience. Dean Johnson, the owner of D/Knows Exterior Construction, inspects every installation for quality assurance, as your satisfaction is our number one goal. We are a licensed roofing contractor and are completely insured for your protection.