Code Eval Report - Type C Drywall

[Self-Certification]

Designer submitting drawings for duplex (side-by-side) with unused attic space/draftstop & continuous 3-point trusses spanning across the fire-rated wall. Specifies design of ceiling to be per R302.3, Exception 2. However, they are calling for 1/2" Type C drywall in lieu of the 5/8" Type X specified in that exception. Thinking of asking them to submit a code eval report to show 1/2" Type C is at least equivalent to 5/8" Type X ... but is there such a report?? I can't seem to find one.

 

[e hilton]

.. but is there such a report?? I can't seem to find one.

Not your problem. Ask them to provide proper documentation, or build it the right way.

 

[cda]

The Difference between Type X and C Drywall

Type X and type C drywall are both fire-resistant but not exactly the same. Read here about their differences to choose the right fire-rated drywall.

www.perfection-drywall-painting.com

 

[cda]

type "C" sheetrock

I think I asked the question before but Type C sheetrock in place of Type X, do you see it much?? pros /// cons??? SHEETROCK FIRECODE C Core gypsum panels provide improved fire protection over standard FIRECODE panels due to additives that enhance the integrity of the core under fire...

www.thebuildingcodeforum.com

 

[Self-Certification]

So ... designer just changed to 5/8" Type X. Couldn't find a code report showing the 1/2 Type C is equal to the 5/8 Type X.

 

[steveray]

How are they handling the required attic access?

 

[tmurray]

How are they handling the required attic access?

I usually see rated attic hatches in these scenarios.

 

[steveray]

Just want to make sure it is not getting overlooked....