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DOORS AND DOOR ASSEMBLIES <br />Commonly used exterior doors for homes in the Minnesota climate are solid - <br />core, glazed and sliding. <br />Sol id -core <br />(STC 27) <br />w/storm <br />(STC 5) <br />French <br />-MR <br />U\. <br />(STC 26) <br />_ Patio <br />(STC 28) <br />STC Ratings for Solid- and Hollow -Core Doors STC <br />Hollow -core wood with brass weather strip 20 <br />French -style wood with 12 lights (single -glazing) 26 <br />Solid -core wood with brass weather strip 27 <br />Hollow steel with magnetic weather strip 28 <br />Insulated steel with compression weather strip 28 <br />Solid -core wood with storm door 34 <br />STC Ratings for Doors with Glazing STC <br />Sliding glass (3/16" glass) 26 <br />Sliding patio with high-performance glass 28 <br />Swinging patio with 3/4" insulating glass 28 <br />Patio with 1/4" laminating glass and 1/2" airspace 30 <br />Swinging patio doors with 3/4" insulating high- 30 <br />performance glass <br />13 <br />