From the Familyhandyman.com
Seal small attic holes with foam and caulk
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| Pull back insulation around vents Seal large gaps with expanding foam |
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| Seal gaps around electrical boxes Use caulk to seal smaller gaps around electrical boxes. |
Hot air rises, so leaks in the ceiling are even worse than leaks in walls. And in many homes, this airflow through ceilings and into the attic is the No. 1 source of heat loss. You can check for leaks around ceiling light fixtures and the attic access door using an incense stick. But the only way to detect other leaks is to crawl up into the attic, pull back the insulation and look for them. Most leaks occur where chimneys and electrical and plumbing lines pass through the ceiling. Although the attic is a nasty place to work, plugging these leaks is a simple project—mostly caulking and foaming gaps.
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