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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.

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.

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.

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.

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.