https://communities.bentley.com/products/building/performance/f/hevacomp-forum/135430/two-internal-ceilings-when-i-add-a-roofI have added a roof my database however when I review the surfaces it still indicates an internal ceiling. I deleted the roof, re-drew it and now the database has two internal ceilings and a roof. The heat gain doesn&#39;t change with or without the roofen-USTelligent Community 12https://communities.bentley.com/thread/410459?ContentTypeID=1Mon, 24 Apr 2017 12:08:58 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:1e45cd2f-14e5-4ed2-aab3-d8f94056af6dShane Regan<p>Hi Tony,</p> <p>You need to use the Setup Exposed Roofs command to connect your roof surfaces&nbsp;to the rooms below. <a href="/products/building/performance/w/building_performance__wiki/28444.cad-model-design-gap-between-roof-and-walls">This article</a> may be of assistance.&nbsp;</p><div style="clear:both;"></div>