US20120151869A1 - Insulated drywall ceiling on steel "c" joists - Google Patents

Insulated drywall ceiling on steel "c" joists Download PDF

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Publication number
US20120151869A1
US20120151869A1 US12/972,618 US97261810A US2012151869A1 US 20120151869 A1 US20120151869 A1 US 20120151869A1 US 97261810 A US97261810 A US 97261810A US 2012151869 A1 US2012151869 A1 US 2012151869A1
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United States
Prior art keywords
joists
wires
construction
web
joist
Prior art date
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Abandoned
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US12/972,618
Inventor
Gary F. Miller
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United States Gypsum Co
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United States Gypsum Co
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Application filed by United States Gypsum Co filed Critical United States Gypsum Co
Priority to US12/972,618 priority Critical patent/US20120151869A1/en
Assigned to UNITED STATES GYPSUM COMPANY reassignment UNITED STATES GYPSUM COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MILLER, GARY F.
Publication of US20120151869A1 publication Critical patent/US20120151869A1/en
Abandoned legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/76—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to heat only
    • E04B1/7654—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to heat only comprising an insulating layer, disposed between two longitudinal supporting elements, e.g. to insulate ceilings
    • E04B1/7658—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to heat only comprising an insulating layer, disposed between two longitudinal supporting elements, e.g. to insulate ceilings comprising fiber insulation, e.g. as panels or loose filled fibres
    • E04B1/7662—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to heat only comprising an insulating layer, disposed between two longitudinal supporting elements, e.g. to insulate ceilings comprising fiber insulation, e.g. as panels or loose filled fibres comprising fiber blankets or batts
    • E04B1/7666—Connection of blankets or batts to the longitudinal supporting elements
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
    • E04B9/22—Connection of slabs, panels, sheets or the like to the supporting construction
    • E04B9/24—Connection of slabs, panels, sheets or the like to the supporting construction with the slabs, panels, sheets or the like positioned on the upperside of, or held against the underside of the horizontal flanges of the supporting construction or accessory means connected thereto
    • E04B9/245—Connection of slabs, panels, sheets or the like to the supporting construction with the slabs, panels, sheets or the like positioned on the upperside of, or held against the underside of the horizontal flanges of the supporting construction or accessory means connected thereto by means of screws, bolts or clamping strips held against the underside of the supporting construction
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
    • E04C2003/0443—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by substantial shape of the cross-section
    • E04C2003/0473—U- or C-shaped

Definitions

  • the invention relates to improvements in building construction and, in particular, to improved fire resistance in insulated, covered metal joist construction.
  • a type of building construction for floors and roofs utilizes C channel sheet metal joists.
  • a roof deck or flooring is secured on upper flanges of the joists and drywall sheets are attached to lower flanges.
  • Lengths of fibrous insulation batts are often disposed in the spaces or cavities between the joists to reduce heat transfer and noise transmission through the roof or floor.
  • the invention provides a simple, reliable, and economical way to improve the fire resistance of steel C channel joist construction. It has been found that a drywall ceiling will remain in place in the event of a fire where insulation batts are supported so that they avoid contact with the drywall and, thereby leave an air space at the upper face of the drywall.
  • the insulation can be suspended above the drywall sheeting by steel wires spaced along the length of and transverse to the joists.
  • the wires bridge between adjacent joists and are located well above the bottom flange of the joists.
  • the joists are manufactured or otherwise provided with aligned wire anchoring sites strategically located along their respective lengths.
  • anchoring elements take the form of holes punched or otherwise formed in the channels at or near the center of their webs. This hole arrangement allows the use of lengths of steel wire to be assembled in pairs of aligned holes and to be locked in place by simply bending their ends at or near right angles to the main section of the respective wire bodies.
  • FIG. 1 is a cross-sectional, fragmentary, elevational view of a floor or roof joist construction in accordance with the invention.
  • FIG. 2 is a cross-sectional, fragmentary view of the construction taken at a plane indicated at 2 - 2 in FIG. 1 .
  • FIGS. 1 and 2 A roof or floor and ceiling construction 10 is illustrated in FIGS. 1 and 2 .
  • the construction comprises a roof deck or flooring 11 , steel joists 12 , insulation 13 , and drywall 14 .
  • a roof deck 11 can comprise any conventional sheeting, including plywood, OSB (oriented stranded board), and CSD (corrugated steel deck).
  • a floor 11 can comprise one or more layers of plywood, OSB, particle board, wood flooring, and CSD, for example.
  • the joists 12 are elongated sheet metal channels having a C-shaped cross-section.
  • a joist 12 has a web 16 oriented in a vertical plane when installed. Commonly a web may be 91 ⁇ 4′′ or 10′′ in width corresponding to the depth or size of the joist; other regular web depths are normally 8, 12, 14 and 16 inches.
  • a flange 17 is formed with an in-turned lip or secondary flange 18 .
  • the ends of the joists are vertically supported by load bearing walls, not shown.
  • the roof deck or flooring panels 11 are typically screwed to the upper flanges 17 of the joists.
  • sheets of drywall 14 are fixed to the lower flanges 17 of the joists 12 with self-drilling screws.
  • the insulation 13 is in the form of a fibrous batt, most commonly fiberglass or mineral fiber.
  • the batts 13 have a nominal width equal to the joist spacing and a nominal thickness less than the depth of the joists 12 .
  • the insulating batt 13 is placed in the space or cavity between adjacent joists 12 prior to the installation of the drywall 14 . It has been found possible to prolong the ability of the drywall 14 to remain in place when its lower surface is exposed to the heat of a fire by installing the insulation batt 13 so that it remains out of contact with the upper surface of the drywall 14 . Under this circumstance, the air space between the insulation 13 and drywall 14 delays heat build-up in the drywall which allows it to maintain its integrity for a longer time period.
  • anchor points 21 in the form of punched or drills holes in the mid area of the webs 16 are provided.
  • the anchor holes 21 are located along the lengths of the joists at regularly spaced intervals, for example, at 12′′ centers or 24′′ centers.
  • Lengths 22 of moderately stiff wire, for example, of 12 gauge mild steel, are threaded through the anchor holes 21 and are mechanically locked into the holes.
  • the wire 22 can be cut to a length that spans the distance between a pair of joists with an additional length so that an end portion 23 on each length of wire, can be bent at or near a right angle on the far side of an anchor hole 21 .
  • One end of the wire 22 can be pre-bent before the wire is threaded through a pair of aligned holes 21 in adjacent joists 12 .
  • the second end 23 can be manually bent to mechanically interlock the wire to the respective joist.
  • the holes 21 can be large enough, i.e. 1 ⁇ 4′′ diameter, to accommodate two wires 21 so as to receive the wires on both sides of a particular joist 12 .
  • multiple holes can be provided.
  • Other anchoring elements, besides the holes 21 can be provided on the joists 12 such as tabs punched out of the web 16 or separate elements welded or otherwise fixed to the joist 12 .
  • the insulation batt 13 will be installed from below the joist 12 before the drywall 14 is installed.
  • Some or all of the wires 22 in a particular joist cavity can be in position in their respective holes 21 before the batt is threaded over the wires.
  • the wires 22 can be progressively installed under a batt as the batt is temporarily supported by the installer.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Acoustics & Sound (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Building Environments (AREA)
  • Floor Finish (AREA)

Abstract

A construction of elongated steel C-channel joists supporting a roof deck or floor and a drywall ceiling, fiber insulation batts disposed in cavities between the joists, the batts having a width substantially the same as the spacing between the joists and a thickness less than the depth of the joist, a series of anchoring elements spaced along the lengths of the joists in a mid-area of the webs, and steel wires suspended between anchoring elements of adjacent joists, the wires serving to support the insulation batts above a plane of the lower joist flanges, whereby an air space is maintained between the insulation batts and drywall ceiling.

Description

    BACKGROUND OF THE INVENTION
  • The invention relates to improvements in building construction and, in particular, to improved fire resistance in insulated, covered metal joist construction.
    • PRIOR ART
  • A type of building construction for floors and roofs utilizes C channel sheet metal joists. A roof deck or flooring is secured on upper flanges of the joists and drywall sheets are attached to lower flanges. Lengths of fibrous insulation batts are often disposed in the spaces or cavities between the joists to reduce heat transfer and noise transmission through the roof or floor.
    • SUMMARY OF THE INVENTION
  • The invention provides a simple, reliable, and economical way to improve the fire resistance of steel C channel joist construction. It has been found that a drywall ceiling will remain in place in the event of a fire where insulation batts are supported so that they avoid contact with the drywall and, thereby leave an air space at the upper face of the drywall.
  • It is believed that the inventive technique avoids trapping heat in the zone immediately above the drywall and thereby delays temperature rise in the drywall and its eventual failure. As disclosed, the insulation can be suspended above the drywall sheeting by steel wires spaced along the length of and transverse to the joists. The wires bridge between adjacent joists and are located well above the bottom flange of the joists.
  • Preferably, the joists are manufactured or otherwise provided with aligned wire anchoring sites strategically located along their respective lengths. In the illustrated example, anchoring elements take the form of holes punched or otherwise formed in the channels at or near the center of their webs. This hole arrangement allows the use of lengths of steel wire to be assembled in pairs of aligned holes and to be locked in place by simply bending their ends at or near right angles to the main section of the respective wire bodies.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a cross-sectional, fragmentary, elevational view of a floor or roof joist construction in accordance with the invention; and
  • FIG. 2 is a cross-sectional, fragmentary view of the construction taken at a plane indicated at 2-2 in FIG. 1.
    •  DESCRIPTION OF THE PREFERRED EMBODIMENT
  • A roof or floor and ceiling construction 10 is illustrated in FIGS. 1 and 2. The construction comprises a roof deck or flooring 11, steel joists 12, insulation 13, and drywall 14. A roof deck 11 can comprise any conventional sheeting, including plywood, OSB (oriented stranded board), and CSD (corrugated steel deck). A floor 11 can comprise one or more layers of plywood, OSB, particle board, wood flooring, and CSD, for example.
  • The joists 12, ordinarily being identical in a particular building area, are elongated sheet metal channels having a C-shaped cross-section. A joist 12 has a web 16 oriented in a vertical plane when installed. Commonly a web may be 9¼″ or 10″ in width corresponding to the depth or size of the joist; other regular web depths are normally 8, 12, 14 and 16 inches. Along each longitudinal edge of the web 16, is a flange 17 with an in-turned lip or secondary flange 18. Generally, the ends of the joists are vertically supported by load bearing walls, not shown.
  • The roof deck or flooring panels 11 are typically screwed to the upper flanges 17 of the joists. Similarly, sheets of drywall 14 are fixed to the lower flanges 17 of the joists 12 with self-drilling screws.
  • The insulation 13 is in the form of a fibrous batt, most commonly fiberglass or mineral fiber. The batts 13 have a nominal width equal to the joist spacing and a nominal thickness less than the depth of the joists 12. The insulating batt 13 is placed in the space or cavity between adjacent joists 12 prior to the installation of the drywall 14. It has been found possible to prolong the ability of the drywall 14 to remain in place when its lower surface is exposed to the heat of a fire by installing the insulation batt 13 so that it remains out of contact with the upper surface of the drywall 14. Under this circumstance, the air space between the insulation 13 and drywall 14 delays heat build-up in the drywall which allows it to maintain its integrity for a longer time period.
  • The invention affords a reliable, simple and economical manner of holding the insulation batts above the plane of the lower flanges 17 of the joists 12 and out of contact with the drywall 14. In the illustrated embodiment, anchor points 21 in the form of punched or drills holes in the mid area of the webs 16 are provided. The anchor holes 21 are located along the lengths of the joists at regularly spaced intervals, for example, at 12″ centers or 24″ centers. Lengths 22 of moderately stiff wire, for example, of 12 gauge mild steel, are threaded through the anchor holes 21 and are mechanically locked into the holes. The wire 22 can be cut to a length that spans the distance between a pair of joists with an additional length so that an end portion 23 on each length of wire, can be bent at or near a right angle on the far side of an anchor hole 21. One end of the wire 22 can be pre-bent before the wire is threaded through a pair of aligned holes 21 in adjacent joists 12. Once the wire 22 is in place, the second end 23 can be manually bent to mechanically interlock the wire to the respective joist. By interlocking the wires 22 in place on the joists 12, they are prevented from migrating or slipping out of position over time due to vibration or thermal expansion and contraction or, importantly, in case of distortion in the event of a fire. The holes 21 can be large enough, i.e. ¼″ diameter, to accommodate two wires 21 so as to receive the wires on both sides of a particular joist 12. Alternatively, multiple holes can be provided. Other anchoring elements, besides the holes 21, can be provided on the joists 12 such as tabs punched out of the web 16 or separate elements welded or otherwise fixed to the joist 12.
  • Normally, the insulation batt 13 will be installed from below the joist 12 before the drywall 14 is installed. Some or all of the wires 22 in a particular joist cavity can be in position in their respective holes 21 before the batt is threaded over the wires. Alternatively, the wires 22 can be progressively installed under a batt as the batt is temporarily supported by the installer.
  • It should be evident that this disclosure is by way of example and that various changes may be made by adding, modifying or eliminating details without departing from the fair scope of the teaching contained in this disclosure. The invention is therefore not limited to particular details of this disclosure except to the extent that the following claims are necessarily so limited.

Claims (6)

1. A building construction comprising a plurality of elongated steel channel joists supporting a roof deck or floor and a drywall ceiling, the joists being of like construction and having a C-shaped cross-section with a web and flanges at opposite longitudinal edges of the web and extending perpendicularly to the web, the width of the web representing the depth of the joist, the joist being regularly spaced from and parallel to one another, the joists being oriented with their webs in a vertical plane such that upper and lower ones of said flanges are determined, the roof deck or floor being on or adjacent the upper one of said flanges and the drywall ceiling being on or adjacent the lower one of said flanges, fiber insulation batts disposed in cavities between the joists, the batts having a width substantially the same as the spacing between the joists and a thickness less than the depth of the joist, a series of anchoring elements spaced along the lengths of the joists in a mid-area of the webs, and steel wires suspended between anchoring elements of adjacent joists, the wires serving to support the insulation batts above a plane of the lower flanges, whereby an air space is maintained between the insulation batts and drywall ceiling.
2. A construction as set forth in claim 1, wherein the wires are bent at the anchoring elements to lock the wires in place.
3. A construction as set forth in claim 2, wherein the anchor elements are holes through the joist webs.
4. A construction as set forth in claim 3, wherein the length of the wires is greater than the spacing between adjacent joists and the wires are assembled through holes in adjacent joists.
5. The construction as set forth in claim 4, wherein the wires are bent at a side of a web opposite the side of the web facing the major length portion of a wire.
6. A method of increasing the fire resistance of a drywall ceiling carried on steel C-channel joists comprising disposing insulation batts in the cavities between the joists, supporting the insulation batts with a space between the batts and the drywall with wires, the wires being threaded through holes in the webs of the joists and being locked in position by bending the ends of the wires over through an angle sufficient to mechanically lock the wire in place on a respective pair of adjacent joists.
US12/972,618 2010-12-20 2010-12-20 Insulated drywall ceiling on steel "c" joists Abandoned US20120151869A1 (en)

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US9027307B2 (en) 2010-06-08 2015-05-12 Innovative Building Technologies, Llc Construction system and method for constructing buildings using premanufactured structures
US9493940B2 (en) 2010-06-08 2016-11-15 Innovative Building Technologies, Llc Slab construction system and method for constructing multi-story buildings using pre-manufactured structures
US9702152B2 (en) 2011-06-17 2017-07-11 Basf Se Prefabricated wall assembly having an outer foam layer
US10041289B2 (en) 2014-08-30 2018-08-07 Innovative Building Technologies, Llc Interface between a floor panel and a panel track
US10260250B2 (en) 2014-08-30 2019-04-16 Innovative Building Technologies, Llc Diaphragm to lateral support coupling in a structure
US10323428B2 (en) 2017-05-12 2019-06-18 Innovative Building Technologies, Llc Sequence for constructing a building from prefabricated components
US10329764B2 (en) 2014-08-30 2019-06-25 Innovative Building Technologies, Llc Prefabricated demising and end walls
US10364572B2 (en) 2014-08-30 2019-07-30 Innovative Building Technologies, Llc Prefabricated wall panel for utility installation
US10487493B2 (en) 2017-05-12 2019-11-26 Innovative Building Technologies, Llc Building design and construction using prefabricated components
US10508442B2 (en) 2016-03-07 2019-12-17 Innovative Building Technologies, Llc Floor and ceiling panel for slab-free floor system of a building
US10570622B1 (en) * 2018-11-05 2020-02-25 Covestro Llc Roof assemblies, methods for their manufacture, and the use of such assemblies in a building
US10590653B1 (en) * 2018-11-05 2020-03-17 Covestro Llc Roof assemblies with inset solar panels, methods for their manufacture, and the use of such assemblies in a building
US20200141115A1 (en) * 2018-11-05 2020-05-07 Covestro Llc Floor assemblies, methods for their manufacture, and the use of such assemblies in a building
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US10724228B2 (en) 2017-05-12 2020-07-28 Innovative Building Technologies, Llc Building assemblies and methods for constructing a building using pre-assembled floor-ceiling panels and walls
US10801197B2 (en) 2015-01-19 2020-10-13 Basf Se Wall assembly having a spacer
US10900224B2 (en) 2016-03-07 2021-01-26 Innovative Building Technologies, Llc Prefabricated demising wall with external conduit engagement features
US10961710B2 (en) 2016-03-07 2021-03-30 Innovative Building Technologies, Llc Pre-assembled wall panel for utility installation
US11054148B2 (en) 2014-08-30 2021-07-06 Innovative Building Technologies, Llc Heated floor and ceiling panel with a corrugated layer for modular use in buildings
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