Small Project Design

BI(h)OME (by Kevin Daly Architects)

Quick Links

Who we are

AIA Small Project Design (SPD) Knowledge Community supports, celebrates, and promotes small projects by engaging designers and the public.

Expand all | Collapse all

Rated walls to deck in Butler style building

  • 1.  Rated walls to deck in Butler style building

    Posted 11-05-2019 07:33
    I'm working on a renovation of a 10,000 SF butler style building (metal building). The project is to convert from a warehouse to an office / business use. The project doesn't have many fire rating requirements, but we do end up with a rated corridor, that has a total occupant load of 60, so we need a 1 hour rated corridor.

    I'm struggling with detailing this corridor. We cannot take the walls to the deck, because the roof is typical of a metal building in that the insulation is batt insulation on the inside, and the metal roof deck is also the roofing, so we can't screw studs to it.

    We can attach studs / track to the purlins, but this leaves a gap of 8" above the top of the wall, which is too much to fire safe.

    I considered doing a rated ceiling in the corridor, but then the inside (room side) gypsum board isn't continuous either.

    Here's my current detail. Not sure if it works, please advise.



    ------------------------------
    David Sisson AIA
    Architect
    David Sisson
    Providence RI
    ------------------------------
    Call for nominations for the Best Practices committee. Apply by the deadline of January 31.


  • 2.  RE: Rated walls to deck in Butler style building

    Posted 11-05-2019 15:51
    All right. I went ahead and used a UL top of wall detail similar to UL #HW-D-0076 and did an upturned long leg track on top of the structural track, and stuffed the annular space with firesafing. It seemed simpler than doing a bunch of rated ceilings everywhere.

    http://productspec.ul.com/document.php?id=XHBN.HW-D-0076


    ------------------------------
    David Sisson AIA
    Architect
    David Sisson
    Providence RI
    ------------------------------

    Call for nominations for the Best Practices committee. Apply by the deadline of January 31.


  • 3.  RE: Rated walls to deck in Butler style building

    Posted 11-06-2019 21:12
    Be aware that PEMB buildings have a lot of movement, sometimes more than a couple inches.  Hilti can assist in designing a joint that flexes with the building.  I have used a method that boxes the girt space with framing and stuffs the voids with fire safing, using a metal enclosure to keep it in place, then building a wall beneath the girts with a flex-head frame and lapping drywall up over the metal closure panel, but no screws to hold it there, allowing flexible joints between the wall and girts.

    ------------------------------
    Patrick Kelly AIA
    President
    Kelly Architectural Services, Inc.
    Zanesville OH
    ------------------------------

    Call for nominations for the Best Practices committee. Apply by the deadline of January 31.


  • 4.  RE: Rated walls to deck in Butler style building

    Posted 11-06-2019 17:39
    In this case, we usually do a tunnel wall where one layer of 5/8" fire code gypsum board wraps the walls and ceiling inside the corridor and then use load bearing studs to span the corridor so that the gypsum board can wrap over the top of the tunnel to have continuous protection from both sides. If the height of the horizontal framing is 16' to 18" above the desired corridor ceiling, you can suspend an acoustical ceiling below the gypsum board on the corridor side so that there is space to lay in lights and ducts without penetrating the fire separation. Then you have less penetrations to protect. UL U309.

    ------------------------------
    Jane Kittner AIA
    Owner
    Kittner & Pate Design Associates
    Waco TX
    ------------------------------

    Call for nominations for the Best Practices committee. Apply by the deadline of January 31.


  • 5.  RE: Rated walls to deck in Butler style building

    Posted 11-06-2019 17:53
    See IBC 708.4 Exception 3.  You can build the corridor as a rated tunnel.  The ceiling can have the same construction as the walls - one layer of Type X each side of the studs (=ceiling rafters), meaning you can use a UL wall design instead of a UL ceiling design for your ceiling.  See Commentary for a drawing of this.

    Stability should be addressed. 

    -Doug Julien, AIA



    Call for nominations for the Best Practices committee. Apply by the deadline of January 31.


  • 6.  RE: Rated walls to deck in Butler style building

    Posted 11-06-2019 18:30
    did you consider a rated t-bar ceiling between rated walls?

    ------------------------------
    Joel Niemi AIA
    Joel Niemi Architect
    Snohomish, WA
    ------------------------------

    Call for nominations for the Best Practices committee. Apply by the deadline of January 31.