Manuel Contreras +Mari (Maria) Contreras were most courteous and highly professional. They took a very comprehensive approach to analyzing my insulation and weatherization needs. In providing superior service support, they patiently and completely answered all my many questions about product quality and labor costs. They thoroughly insulated my attic to completely cover my joists, air-conditioning ducts and all the exposed spaces to interior sheetrock walls. As an added bonus, they completed and submitted all the paperwork required for my local rebate. I highly recommend Insulation Works as they rank among the best service providers that I have used.