polyurethane spray foam insulation went into our roof cavity. at R6 per inch this meant we only needed 5 inches
of foam to meet R30. it also meant we could eliminate all ridge and soffit vents in the roof to maintain a seamless
transition of the metal at various edges. despite looking like scary yellow industrial slime clinging to the rafters,
spray foam, once expanded, is actually non-toxic and will prevent many of the mold and mildew issues prevalent
with batt.
