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Back to Case Studies
Case Study
Kendall at Hanover Retirement Center and
Extended Care Facility (1994)
Problem: Roof Ice Dams
The first year Kendall at Hanover was built, more
than $150,000.00 was spent on repairing damage caused by roof ice dams. Joe
Lstiburek of Building Science Corp. diagnosed the problem. FOAM-TECH was
asked to repair the ice dam problem in 80,000 square feet of public
building area. To date, no ice dam repair costs have been required in the remediated areas.
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This is a side view of a piece of insulation that was removed from the attic roof. The dark area shows the air flow pattern as the warm, moist indoor air passes from the inside to the
outside of the roof cross-section. This is the the result of leakage in the air barrier portion of the thermal envelope system being connected to the roof ventilation passage.
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Blower-door equipment was used in the windows to depressurize the attics so that the work could proceed while the extended
care facility was operating normally.
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The picture shows an area which has had the first round of air sealing (right side with the snow cover) done from the inside of the attic. The area on the left has not been started, and
the lower cathedral slope roof (middle) is in process.
All of these areas had R=38 insulation and a vapor retarder, but no effective air barrier.
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The upper roof area on the left has been repaired from the outside, the adjoining cricket area and the
attic on the right have not been repaired. The vertical melt lines are steel and
masonry structural components that directly contact the roof sheathing.
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