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Air Sealing Where it Counts

The graph below shows which structural air-leaks drive up energy costs the most, allowing you to maximize efforts toward reinforcing your home's building envelope. 

This image comes from http://www.builderonline.com/energy-efficientconstruction/5-penetrations-that-provide-the-most-bang-for-your-air-sealing-buck.aspx 

Comments

Lighting

You bring up a good point here showing this graph. Lighting is a horrible culprit for air infiltration. One has to be carful about fixing this issue however, because a light needs to stay cool and if insulated improperly can be a fire hazard (can lights in particular). It may be an easy fix, but if you have a lot of lights the task may become daunting. Amazing that insulated light fixtures is not talked about in the IBC. When looking at lights in a infrared inspection camera, they show as dark holes in the ceiling...when they are not on of course.

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