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Can lights leak air from you home into the attic (which is outside your home). It's very similar to leaving the windows open 24/7/365 even when heating and cooling the house. You are paying for that heated and cooled air.
Rock wool can light covers not only seal this heated and cooled air in your home, and preventing it from leaving.
It keeps any flammable materials away from the can light which can reach temperatures allowing wood and certiain types of insulation to catch fire!!!
This Charles Town, WV homeowner had issues with cold floors and freezing water lines during the winter. Comfenergy solved both by installing TerraBlock floor insulation, covered it with CleanSpace 20 mil vapor barrier, and insulated the walls with closed cell spray foam insulation.
Sometimes comfort and energy issues can be caused by leaky and poorly insulated HVAC ducting. The before/after pics that follow show a duct that was poorly insulated, running through a cold attic in the winter. Hot air was leaking into the attic instead of going to the room to deliver the hot air. Plus there was little to no insulation on it which was "cooling down" the heated air making it less efficient.
Comfenergy sealed the ducting and insulated it with an R13, closed cell spray foam. This seals the duct leakage and insulates it to better than the existing code (R8)
This home in Charles Town WV was designed with several cantilevers. A cantilever ("a long projecting beam or girder fixed at only one end") is part of the home that hangs out from the walls of the home. The cantilevers of this home were uninsulated and therefore allowed the outside temperature to impact the air and comfort of the inside rooms connected. Our Home Performance Sales Pro Greg determined that the use of spray foam to insulate the cantilever would help solve this problem. The lower cover of the cantilever was removed by our production crew and then spray foam was used to fill in the hollow space inside.
This Boston, VA homeowner had issues staying warm in the winter and cool in the summer. A FREE comfort evaluation by Comfenergy revealed, among other things, an HVAC ducting system located in the attic that was both leaky and not insulated. The hot air was leaking into the attic in the winter. The cold air was becoming re-heated in the summer. Not only was this causing discomfort, but it was making their utility bills go literally through the roof!!
Comfenergy encapsulated the attic ducting system to seal it from those air leaks. This keeps all of their air in the home! It also insulates the air travelling through the ducting system so that it comes out of the vents at the right temperature to stay comfortable.