Tuesday, February 05, 2013
Using Light Snowfalls to Track Heat Loss
The melt pattern in this photo is from my own roof. There are two small spots where the snow is melting faster. The bigger one coincides with where a heat vent is close to the ceiling in the bathroom. Adding more insulation to that spot is tricky, because one has to squeeze in close to the rafters in the attic, and be sure not to stuff insulation so far in that it touches the roof boards and cuts off airflow needed to keep the boards dry.
A 2008 post on this subject offers more melt patterns, and has a useful comment by a reader about the problem with recessed lighting.
Posted by Stephen Hiltner