Assertion: insulation's r value | /r/HasProperty | required
Facets:
Source sentences:
text: In fact, it’s not uncommon to find homes insulated with both types: economical fiberglass insulation installed throughout most of the house, and mineral wool used as firestops and in places where a little extra R-value is required, such as north-facing walls.
text: As we reach zone 8, R values of 6 are required.