NCARB Practice Exam - Insulating wall cavity values

Follow

Ariana Parrish

November 12, 2022 13:29

Hi Everyone, me again haha. 

I have another question about this answer, why is the R6.75 (compliant) for the rigid insulation in the brick veneer cavity

0

• 

  Rebekka O'Melia November 16, 2022 18:28 (Edited November 16, 2022 18:31)

  Hi Ariana.  This is a steel frame building, non-residential.  It needs R25 ci in the roof and R13 + R5 ci in the walls.  Choice A doesn't have enough insulation in the walls that's cotinuous  Choice B doesn't have enough insulation in the roof.  It has R24, but needs R25.  Choice C is the only one that has enough insulation in the roof and walls.  It needs R-5 or more c.i. = continuous insulation, which is insulation that is not in between the studs.  Hope this helps!

  Rebekka O'Melia, R.A., NCARB, B. Arch, M. Ed, Step UP ARE 5.0 Courses

  2

  Comment actions Permalink
• 

  Charles Lent December 03, 2022 21:24

  Hi Rebekka O'Melia can I ask how you determined this was a steel frame building? 

  Did you just use common sense here? I did not see that mentioned anywhere. I see "metal stud back up assembly" so i was focused on "metal building" in this chart. 

   

  Thanks 

  0

  Comment actions Permalink
• 

  Rebekka O'Melia December 03, 2022 23:15 (Edited December 03, 2022 23:17)

  Hi Charles,

  The scenario states that the building is a “exterior brick veneer with a metal stud back up wall“. The choices for above grade walls include mass, metal building, steel frame or wood framed.  The metal building choice has an asterisk on it, which states below that a “metal building” is a pre-engineered rigid frame, fabricated offsite. That is clearly not what this building is. It’s also not a mass building or wood framed so steel framed is the only correct choice it could be.

  Hope this helps and keep studying!

  Rebekka 

  0

  Comment actions Permalink
• 

  Charles Lent December 04, 2022 17:46

  Thanks, Rebekka, so a bit of common sense/ruling out I suppose! 

   

  0

  Comment actions Permalink

Please sign in to leave a comment.