Going Green Check List
This local split-level is typical for its time; it has 2x6 ceiling joists and 2x8 rafters. The owners have converted to a ground source heating and cooling system. But were unable to achieve the savings and comfort they expected.
Their crawl space had major moisture issues. They put in an external and internal drainage system, as well as sand bags and a dehumidifier. The vented crawl space and moisture issues caused the insulation under the floor to mold and that had to be removed. Steel Residence
Some of the mechanicals for the geothermal system were located in the unconditioned crawl space and attic.
To combat the heat gain in the attic, the homeowners had installed mechanical and passive vents in the gables and through the roof.
The insulation was old and in some locations non-existing especially near the many non-IC recessed lights.
The house does contain a Vermont Casting stove insert that was not in service.
All things considered I suggested moving the thermal barrier to the underside of the new roof sheathing making sure it was continuous to the external wall plates. The foam company introduced me to a hybrid system applying a layer of closed cell foam first followed by a layer of open-cell to achieve the specified R-38 both to the roof areas and the gable ends.
In the crawl space, a membrane was applied over the concrete coating and up the sidewalls. The foamers then sprayed foam over the sidewalls and band joist areas to complete the thermal and moisture barrier.
We completed the project with a test-out by an independent contractor with a blower door test and then....
an IR test that shows the homeowner if there are any cold areas left. The independent contractor provided the homeowner with the assurance that the house was indeed tight, but would not require mechanical ventilation. I will continue to monitor the project and plan a study comparing the homeowners utility bills.
5 Peaceful Lane West Chester, PA 19380
© Scott K. Bailey