Description
This is a repository for all NorthernSTAR Overcoat insulation retrofit projects. Both houses received Overcoat insulation retrofit on roof only, performed by Cocoon Insulation.
1 - St. Louis Park house - St. Louis Park, MN
2 - Edina house - Edina, MN
In this second study, the team wished to analyze the before and after air-tightness data from roof only ETMMS retrofits on 1.5-story homes in cold and very cold climates. To identify homes to analyze, we reached out to our national network of energy professionals, home performance contractors, and general contractors who had expressed interest in promoting roof-only External Thermal Moisture Management System (ETMMS) to clients. Five projects by three contractors were submitted for consideration as they were being done to mitigate severe ice dams for homeowners. Only two of the five projects followed a roof only ETMMS protocol. Data from the other three projects, however, were reviewed with the air-tightness data of 250 roof-only, interior-applied energy retrofits on 1.5-story homes provided by three NorthernSTAR industry partners. These data represent homes in the general market as well as homes that were part of the state of Minnesota weatherization program.
Resources
| Name | Format | Description | Link |
|---|---|---|---|
| Eave detail existing.jpg | JPG | Picture | Open resource |
| Eave detail insulated.jpg | JPG | Picture | Open resource |
| Edina House post retrofit.jpg | JPG | Picture | Open resource |
| Overcoat GM1 My Case2 POST-RETROFIT.xml | XML | This is not a real structure. This is the "model house" AFTER incorporating the insulation and airtightness retrofit package installed in NorthernSTAR Overcoat projects. This case incorporates continuous roof plane insulation, as used in the Overcoat projects. | Open resource |
| Overcoat GM1 My Case2 PRE-RETROFIT.xml | XML | This is not a real structure. This is the "model house" BEFORE incorporating the insulation and airtightness retrofit package installed in NorthernSTAR Overcoat projects. This case incorporates a continuous insulated roof deck. | Open resource |
| Overcoat GM1 My Case POST-RETROFIT.xml | XML | This is not a real structure. This is the "model house" AFTER incorporating the insulation and airtightness retrofit package installed in NorthernSTAR Overcoat projects. This case incorporates a conditioned attic with insulated floor joists, knee walls, and "micro attic" above the 2nd floor ceiling. | Open resource |
| Overcoat GM1 My Case PRE-RETROFIT.xml | XML | This is not a real structure. This is the "model house" BEFORE incorporating the insulation and airtightness retrofit package installed in NorthernSTAR Overcoat projects. This case incorporates insulated floor joists, knee walls, and micro attic above the 2nd floor ceiling. | Open resource |
| Overcoat roof detail.jpg | JPG | Picture | Open resource |
| St Louis Park House post retrofit.jpg | JPG | Picture | Open resource |
| Airtightness Results of Roof-Only Air Sealing Strategies on 1.5-Story Homes in Cold Climates | In 2012, the NorthernSTAR Building America Partnership began exploring alternative methods to find long-term solutions to energy loss in 1.5- story homes to save energy, improve comfort, and reduce the risk of ice dam formation/reformation. This report details the NorthernSTAR Building America Partnerships findings from Project Overcoat. | Open resource |