2 Hour Head of Wall at PEMB

Question

Posted by Robin Jover 5 years ago

I'm looking for a 2-hour rated head of wall detail for a gyp bd and metal stud wall terminating against faced insulation at a pre-engineered metal building roof. The UL detail HW-D-0528 has all the components I need, but not a 2-hour rating. Thanks in advance!

Pre-Engineered Metal Building,2-hour,head-of-wall

1 Reply

Posted by Matt Bakerover 5 years ago

Hilti Verified

Hello Robin,

Our closest system will be CJ-D-0004 (see attached). Unfortunately given testing in order to achieve the 2 hour rating the roof insulation would need to be removed at the head of wall. Or if the roof insulation must remain in place we can offer a cold smoke seal EJ with no rating. Please see the attached EJ request form for your review. Your request can be submitted to usfirestopeng@hilti.com and we can begin processing an EJ.

Thank You for choosing Hilti as your Firestop Expert!

Best regards,
Matt Baker

engineering judgment,roof,joint

W1_en_engineering_judgement_request_form_82019.pdf1.87 MB

CJD0004a.pdf166.85 KB

4 comments on this reply

Posted by Matt Bakerover 5 years ago

Hi Robin, We can provide the detail if you submit an EJ request to us. If you copy and include our conversation here when emailing it to usfirestopeng@hilti.com, one of our engineers will be able to know what to provide. Thanks, Matt

Posted by Robin Jover 5 years ago

Matt, OK, what would this Cold Smoke Seal detail look like? Is it a UL system or is it just a material note at the top of the wall? Oh, and do I need to submit an EJ to you for this? Thanks,

Posted by Matt Bakerover 5 years ago

Hi Robin, We can definitely provide a detail. But with the insulation remaining below the roof (which is ideal for the vapor barrier, HVAC, etc.) we can only provide a cold smoke seal solution for 2 hours or greater. Several AHJs have accepted this given most of the time there's nothing above the roof that requires protection from fire. Thanks, Matt

Posted by Robin Jover 5 years ago

Matt- Hi, thanks for your quick reply. I'm not exactly sure the CJ-D-0004 is what I'm looking for, we will be parallel to the roof flutes, not perpendicular. And this is not really metal decking its metal roofing panels. I think we do need to keep the insulation. This is an existing building and we don't have the scope to do major modifications. Would something like the HW-D-0528 not work for this situation? I saw an question on the forum from last year where someone asked a similar situation and they were told the HW-D-0528 could be adjusted to 2 or 3 hour ratings with a EJ. Is that still the case? Thanks again for your speedy response.