Many ask how do you insulate an attic? We seal up air leaks throughout your attic first. Usually around the chimney and plumbing stacks are where there are the biggest leaks. Light fixtures and bathroom fans are also areas where some of the homes biggest leaks occur. We do not block off the ventilation in your attic. We install ventilation baffles. Preparing for the insulation of an attic can be lengthy prior to installing the additional insulation. Every house is different, so contact an expert to assist you!