How To Look At A House
McGarry and Madsen's home inspection blog for buyers of
site-built, mobile/manufactured and modular homes
Why are there bald spots of missing insulation in my attic?
Tuesday, November 8, 2022
Here are four possible reasons for gaps in your attic insulation:
1) Insulation was moved for repair or installation work in attic and not replaced afterwards - Workmen in the attic have to move it for repairs or new installations of cable, plumbing, or electric. Sometimes they do a sloppy job of putting the insulation back, or don’t bother at all.
2) Critters - Rats, squirrels, or birds that find their way into an attic move insulation around as part of their nest-building process. Fecal pellets and shredded insulation in the area are a clue that’s the problem.
3) Remodeling of porch, carport or garage into living space - Rooms that are not used as a living space are not required by the building code to be insulated at the time of original construction of a home. Sometimes the addition of insulation above the ceiling is not done when they are converted to interior living areas. We often see this problem in a garage remodeling. This can be because of a simple oversight by a weekend-warrior remodeler or due to lack of easy access to the area between ceiling and roof.
4) Insulation poorly secured - Insulation on vertical surfaces in an attic, such as around the light shaft for a skylight, or the walls of rooms built into an attic, can slide down the wall over time if not well secured.
And, on just one occasion, we inspected a new house where the builder just forgot to install the attic insulation. Gaps in attic insulation are easily detected from below the ceiling by any home inspector with an infrared camera, and noted with photo documentation in their report.
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Field Guide for Home Inspectors, a quick reference for finding the age of 154 brands of HVAC systems, water heaters, and electrical panels, plus 210 code standards for site-built and manufactured homes, and the life expectancy rating of 195 home components. Available at amazon.com for $19.95.
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