NZ720992B2 - Drywall joist hanger connection - Google Patents

Abstract

Joist hangers are used in building construction to secure the ends of joists or other members to headers or other support members. Drywall is used as a fire barrier, but generally cannot be used to shield supporting structural members like top plates and headers because drywall is susceptible to cracking and crushing and has little bearing strength with regard to fasteners in the drywall. A connection utilizing a joist hanger to hang a substantially horizontal joist or beam from a wood structural support member such as a top plate or header in cooperation with a first plurality of fasteners such as screws and one or more substantially vertical fire-resistant panels such as drywall. This allows the drywall panel, which is relatively incombustible, to extend up far enough to cover the front surface of the header. cking and crushing and has little bearing strength with regard to fasteners in the drywall. A connection utilizing a joist hanger to hang a substantially horizontal joist or beam from a wood structural support member such as a top plate or header in cooperation with a first plurality of fasteners such as screws and one or more substantially vertical fire-resistant panels such as drywall. This allows the drywall panel, which is relatively incombustible, to extend up far enough to cover the front surface of the header.

Description

(12) Granted patent specificaon (19) NZ (11) 720992 (13) B2 (47) Publicaon date: 2021.12.24 (54) DRYWALL JOIST HANGER CONNECTION (51) Internaonal Patent Classificaon(s): E04B 1/26 E04B 1/94 E04B 5/12 (22) Filing date: (73) Owner(s): 2014.12.12 Simpson Strong-Tie Company, Inc. (23) Complete specificaon filing date: (74) Contact: 2014.12.12 Spruson & Ferguson Pty Ltd (30) Internaonal Priority Data: (72) Inventor(s): US 14/106,714 2013.12.14 BUNDY, Gregory D.

MUHN, Dustin P. (86) Internaonal Applicaon No.: EVANS, Thomas G.

GRAY, Daniel M. (87) Internaonal Publicaon number: WO/2015/089467 (57) Abstract: Joist hangers are used in building construcon to secure the ends of joists or other members to headers or other support members. Drywall is used as a fire barrier, but generally cannot be used to shield supporng structural members like top plates and headers because drywall is suscepble to cracking and crushing and has lile bearing strength with regard to fasteners in the drywall. A connecon ulizing a joist hanger to hang a substanally horizontal joist or beam from a wood structural support member such as a top plate or header in cooperaon with a first plurality of fasteners such as screws and one or more substanally vercal fire-resistant panels such as drywall. This allows the drywall panel, which is relavely incombusble, to extend up far enough to cover the front surface of the header.

NZ 720992 B2 DRYWALL JOIST HANGER CONNECTION FIELD OF INVENTION The present invention relates to building construction and, more particularly, to a joist hanger adapted to secure a joist to a header or other support member with a first drywall panel between the back of the joist hanger and the front of the header. This allows the first drywall panel, which is relatively incombustible, to extend up far enough to cover the front surface of the header.

BACKGROUND Joist hangers are used in building construction to secure the ends of joists or other members to headers or other support members. Typically, the joist hanger includes a u-shaped portion that receives the joist. The bottom surface of the joist rests on the seat of the hanger, and the side walls of the hanger are dimensioned to closely receive the side faces of the joist, providing it with lateral support.

Where appropriate, the joist may be connected to the hanger by means of nails driven through the side walls into the side faces of the joist. These nails may simply be driven horizontally into the joist, in which case they are preferably short nails that will not pass through the joist. Alternatively, longer nails may be used that are driven horizontally and angularly into the joist such that they are driven into the header as well. This is commonly referred to as toe- nailing. The other common way to nail the hanger to the joist is to use short nails that are driven downward at an angle into the joist only.

Often, in order to connect the joist hanger to the header, back flanges are attached to the side walls. Generally, these flanges extend laterally from the side walls, to overlap a portion of the face of the header. These flanges can extend inwardly or outwardly from the side walls, depending on design considerations.

Openings may be provided in the back flanges to receive fasteners. These fasteners are generally nails in light-frame wood construction. Screws and bolts are also used in wood 24121529 construction, depending on the size of the members to be joined and other considerations. In light-gauge steel construction, sheet metal screws, bolts and rivets are commonly used.

In perhaps the simplest hangers, the back flanges extend outwardly from the side flanges, providing an easily-accessed fastening face. Fasteners are then driven though the back flanges into the header. In other instances, design considerations dictate which particular attachment method is used for attaching the joist and the hanger to the header.

In addition, top flanges may be attached to the back flanges to aid in attaching the hanger to the header. Hangers with top flanges are generally referred to as top-flange hangers. Hangers without top flanges are generally referred to as face-mount hangers. If the top flanges wrap over the top of the header and down the back of the hanger can be called a wrap-around hanger.

Again, various design considerations dictate what features are present in a hanger, and various building considerations dictate which hanger, or type of hanger, is used in a particular situation.

Generally, if a top flange is used and the header is made of wood, pre-formed holes with be provided in the top flanges to receive suitable fasteners for connecting the top flange to the hanger. No such fastener openings are required in steel construction because the hanger is typically fastened to the header with self-drilling sheet metal screws or by welding.

As mentioned above, it is often desirable to fasten the joist to the hanger. This is generally done to resist uplift forces acting on the joist. Such forces are often caused by lateral loading on the building due to high winds or seismic activity. Also, one end of a joist must be downwardly restrained if that joist is cantilevered (e.g., to support an overhanging deck). As mentioned above, openings may be provided in the side walls of the hanger so that the joist can be held down with fasteners driven through the openings and into the joist.

Drywall is used in fire barriers, but generally cannot be used to shield supporting structural members like top plates and headers because drywall is susceptible to cracking and crushing and has little bearing strength with regard to fasteners in the drywall. The present invention allows drywall to be applied to the supporting structural members, shielding them from fire and heat, and provides a joist hanger connection that does not damage the drywall.

Importantly, the present invention does not require any alteration of the drywall or the addition of any otherwise extraneous components. The drywall can simply be applied to the front face of the supporting member, completing covering and shielding it, and the joist hanger can then be 24121529 attached by driving long screws directly through the drywall and into the supporting structural member.

The present invention uses sufficiently long, thick and stiff screws that the screws can act as cooperating cantilevers, holding the hanger away from the header and against the first drywall panel without sagging. The hanger applies a sufficiently large, flat surface to the exterior drywall sheet in order to stabilize the connection without crushing the drywall either during installation (when the screws might otherwise be overdriven) or after.

SUMMARY OF THE INVENTION The present invention provides a connection that allows a joist hanger to be attached to a supporting structural member with fire-resisting panels interposed between them without damaging the fire-resistant panels or compromising the strength of the connection.

The present invention provides a connection in which a joist hanger is fastened against panels that have little or no dowel bearing strength, without damage to the panels.

The present invention provides a connection in which a joist hanger is held away from the supporting structural member to which it is attached.

In one embodiment, the present invention provides a joist hanger that bridges the tops of the panels interposed between it and the supporting structural member, in order to form a more secure attachment thereto.

The present invention provides a joist hanger with back plate fastener openings that are all near the tops of the back plates, in particular for connection to a double 2x4 top plate.

The present invention allows panels to be placed over a supporting structural member thereby shielding it from fire and heat, with the top edges of the panels in which the attachment is received, reaching at least as high as the top of the structural support member. 24121529 The present invention provides a connection in which the joist hanger is connected to the supporting structural member by cantilevered screws that are only partially embedded in the structural support member.

The present invention provides a connection in which the joist hanger is formed so that no more than one fastener attaches each back plate above the adjacent side member.

The present invention provides a joist hanger that can be fastened to a structural support member through substantially non-load-bearing panels with only two screws on each side and no loss of bearing strength.

DESCRIPTION OF THE DRAWINGS is an upper right perspective view of a connection formed according to the present invention in which the joist hanger has a pair of top flanges. is an exploded upper right perspective view of the connection shown in is a cross-sectional right side elevation view of the connection shown in is a front elevation view of the joist hanger shown in is a rear elevation view of the joist hanger shown in is a top plan view of the joist hanger shown in is a bottom plan view of the joist hanger shown in is a right side elevation view of the joist hanger shown in is a left side elevation view of the joist hanger shown in is a an upper right perspective view of a connection formed according to the present invention in which the joist hanger does not have a pair of top flanges. 24121529 is a cross-sectional right side elevation view of the connection shown in . is a front elevation view of the joist hanger shown in is a rear elevation view of the joist hanger shown in . is a top plan view of the joist hanger shown in . is a bottom plan view of the joist hanger shown in . is a right side elevation view of the joist hanger shown in . is a left side elevation view of the joist hanger shown in . is a an upper right perspective view of a connection formed according to the present invention in which the joist hanger does not have a pair of top flanges and each back plate member is attached with only two fasteners. is a front elevation view of the joist hanger shown in . is a rear elevation view of the joist hanger shown in .

DESCRIPTION OF THE PREFERRED EMBODIMENT As shown in Figure 1, the invention is a connection 1 utilizing a joist hanger 2 to hang a substantially horizontal joist 3 from a wood structural support member 4 in cooperation with a first plurality of fasteners 5 and one or more substantially vertical fire-resistant panels 6.

Preferably, the one or more fire-resistant panels 6 shield the wood structural support member 4, and each of the one or more fire-resistant panels 6 has a front face 7, a back face 8 opposite the front face 7, and negligible dowel bearing strength. While not shown in the drawings to show the vertically disposed studs and top plate 4 that makes up the wall, the panels 6 cover all of the structural wood members that make up the wall to protect them from fire. 24121529 As shown in Figure 2 and 3, each fastener 5 preferably has a shank 13. Preferably, the structural support member 4 has a substantially vertical front face 16 and significant dowel bearing strength. The joist hanger 2 preferably supports the joist 3.

Preferably, the joist hanger 2 has a first back plate member 9, a second back plate member 9, a first side member 11, and a second side member 11.

The first back plate member 9 preferably has a first back face 10 in parallel registration with the front face 7 of a first panel 6 of the one or more panels 6. Preferably, the second back plate member 9 also has a second back face 10 in parallel registration with the front face 7 of the first panel 6 of the one or more panels 6. The first side member 11 preferably is connected to the first back plate member 9. Preferably, the second side member 11 is also connected to the second back plate member 9.

As shown in Figure 3, at least one of the first plurality of fasteners 5 preferably passes through the first back plate member 9 and the one or more panels 6 and into the structural support member 4. Preferably, at least one of the first plurality of fasteners 5 also passes through the second back plate member 9 and the one or more panels 6 and into the structural support member 4. The joist 3 preferably is supported by the joist hanger 2. Preferably, the one or more panels 6 are between the joist hanger 2 and the structural support member 4 and the back face 8 of one panel 6 of the one or more panels 6 interfaces with the front face 16 of the structural support member 4.

The first and second back plate members 9 preferably are planar, with first and second front faces 19 opposite the first and second back faces 10, first and second inner edges 20 that preferably are linear, and first and second outer edges 21 opposite the first and second inner edges 20. The first and second outer edges 21 preferably have first and second upper substantially vertical potions 22 and first and second lower slanted portions 23 that converge downward. The first and second back plate members 9 preferably have first and second top edges 24 that are oriented up and first and second bottom edges 25 that are oriented down. The first and second back plate members 9 preferably are formed with fastener openings 26 near the first and second top edges 24. Although the back plate members 9 are shown as splayed outward in opposite direction, they could both be bent inward to face each other between the first and 24121529 second side members 11, or they could both be bent in the same direction, either left or right, with one between the first and second side members 11. The joist hanger 2 of the present invention is preferably formed from light gauge sheet steel on an automated die press and is designed to be cut from the sheet metal blank with little waste. The embodiments of the invention shown in Figures 1 – 17 are preferably made from 12 gauge sheet steel, and the embodiment shown in Figures 18 and 19 that has only two fastener openings 26 in each back plate member is preferably made from 14 gauge steel.

The first and second side members 11 preferably are planar as well, with first and second inner faces 27 that face the joist 3, and first and second outer faces 28 opposite the first and second inner faces 27. The first and second side members 11 preferably have first and second back edges 29 that form an angular joint 47, preferably orthogonal, where they meet the first and second inner edges 20 of the first and second back plate members 9. As shown in figures 8 and 9, the first and second side members 11 preferably have first and second front edges 30 opposite the first and second back edges 29. The first and second front edges 30 preferably have first and second lower substantially vertical portions 31 and first and second upper slanted portions 32 that angled back toward the first and second back edges 29. The first and second side members 11 preferably have first and second top edges 33 slightly below the level of the first and second top edges 24 of the first and second back plate members 9. The first and second side members also preferably have first and second bottom edges 34 opposite the first and second top edges 33 and slightly above the level of the first and second bottom edges 25 of the first and second back plate members 9. The first and second side members 11 preferably are formed with fastener openings 35.

The one or more panels 6 preferably are drywall panels 6. Drywall, otherwise known as plasterboard, wallboard, gypsum board, sheetrock, or gyprock, is a panel made of gypsum plaster pressed between two thick sheets of paper. It is used to make interior walls and ceilings. In the United States and Canada, drywall panels are manufactured in 48-inch wide panels in varying lengths. Common panel thicknesses are 1/2-inch and 5/8-inch. In the present invention, two layers of 5/8-inch drywall is preferred. Drywall is naturally fire resistant and can be used to cover and protect the structural members of a building. However, gypsum is friable and has little or no dowel bearing strength. Other panel materials and qualities are also possible. 24121529 Preferably, the joist hanger has a seat member 12 interconnecting the first and second side members 11, and the joist 3 rests on the seat member 12 between the first and second side members 11. Preferably, no part of the joist hanger 2 contacts the front face 16 of the structural support member 4. The joist hanger 2 is not embedded in the structural support member 4. The seat member 12 preferably has a substantially horizontal upper face 36 that interfaces with the joist 3. The seat member 12 also preferably has a lower face 37 opposite the upper face 36, first and second linear side edges 38, a back edge 39 orthogonal to the first and second side edges 38, and a front edge 40 parallel to the back edge 39. The first and second side edges 38 preferably form an angular joint 48, preferably orthogonal, where they meet the first and second bottom edges 34 of the first and second side members 11.

Each of the one or more panels 6 preferably has a top edge face 14. In a preferred embodiment, the joist hanger 2 has a first top flange 15 connected to the first back plate member 9 and a second top flange 15 connected to the second back plate member 9. The first and second top flanges 15 preferably extend over the top edge faces 14 of the one or more panels 6 and are the only parts of the joist hanger that contact the structural support member 4. Preferably, the first and second top flanges 15 are fastened to the structural support member 4. The structural support member 4 preferably has a top face 17, the first and second top flanges 15 are fastened to the top face 17 of the structural support member 4. Preferably, the first and second top flanges are fastened to the structural support member 4 with a second plurality of fasteners 5. Most preferably, these fasteners 5 are nails.

The first and second top flanges 15 preferably are planar, with first and second upper faces 41 and first and second bottom faces 42 opposite the first and second upper faces 41.

Preferably, the first and second bottom faces 42 contact the top face 17 of the structural support member 4. The first and second top flanges 15 preferably have first and second parallel side edges 43, a first and second front edges 44 and first and second back edges 45. The first and second front edges 44 preferably form an angular joint 49, preferably orthogonal where they meet the first and second top edges 24 of the first and second back plate members 9. Preferably, the first and second top flanges 15 are formed with fastener openings 46.

As shown in Figures 1, 3 and 18, the first plurality of fasteners 5 that attach the joist hanger 2 to the structural support member 4 preferably are all within the upper one-third of the first and second back plate members 9. Preferably, the structural support member 4 is a top plate 24121529 4 consisting of one or more parts 50 that have a height less than one-third the height of the joist hanger 2. The parts 50 of the top plate 4 preferably are two pieces of 2x4 dimensional lumber Preferably, each of the one or more panels 6 has a top edge face 14 and the structural support member 4 has a top face 17. The top edge face 14 of each of the one or more panels 6 preferably is located at the level of the top face 17 of the structural support member or above the top face 17 of the structural support member 4, thereby shielding and protecting the structural support member 4 from excessive heat.

Preferably, the first and second back plate members 9 have first and second top edges 24, respectively. The first and second back faces 10 of the first and second back plate members 9 preferably interface with the front face 7 of the first panel 6 of the one or more panels 6 below the first plurality of fasteners 5 that pass through the first and second back faces 10 and the one or more panels 6 and into the structural support member 4. Preferably, the interface between first and second back faces 10 of the first and second back plate members 9 and the front face 7 of the first panel 6 of the one or more drywall panels 6 extends at least three times as far from the first and second top edges 24 of the first and second back plates 24 as the location of any of the first plurality of fasteners 5 in the first and second back plate members 9. This distributes pressure on the front face 7 of the first panel 6 of the one or more panels 6 so that the panels 6 are not crushed by the joist hanger 2.

In a preferred embodiment shown in figures 18, 19 and 20, no more than two of the first plurality of fasteners 5 fastens each of the first and second back faces 10 of the first and second back plate members 9 to the structural support member 4 through the one or more panels 6. This arrangement achieves the highest load value per fastener 5, and the result is unexpected.

As shown in figure 11, preferably, each of the first plurality of fasteners 5 is a screw 5 that has a tip 18 embedded in the structural support member 4. The screws 5 are cantilevered beyond the front face 16 of the structural support member 4, through the panels 6 which do little or nothing to support the shanks 13 of the screws 5. The most preferred fasteners 5 for the cantilevered attachment of the joist hanger 2 to the structural support member 4 are Simpson Strong-Tie SDS screws that have a 3.5-inch shank length and a ¼-inch shank diameter. 24121529 The joist hanger 2 preferably has a first back plate member 9 with a first plurality of fastener openings 26 that are all located in the upper third of the back plate member 9.

Preferably, the joist hanger 2 has second back plate member 9 with a second plurality of fastener openings 26 that are all located in the upper third of the back plate member 9. The joist hanger 2 preferably has a first side member 11 connected to the first back plate member 9, the first side member 11 having a first top edge 33 below the first top edge 24 of the first back plate member 9. Preferably, the joist hanger has a second side member 11 connected to the second back plate member 9, the second side member 11 having a second top edge 33 below the second top edge 24 of the second back plate member 9.

At least one of the first plurality of fasteners 5 preferably passes through the first back plate member 9 and one or more panels 6 and into the structural support member 4. As shown in figures 3, 4 and 5, preferably, no more than one of the plurality of fasteners 5 passes through the first back plate member 9 above the first side member 11. Similarly, at least one of the second plurality of fasteners 5 preferably passes through the second back plate member 9 and the one or more panels 6 and into the structural support member 4. Preferably, no more than one of the plurality of fasteners 5 passes through the second back plate member 9 above the first side member 11. The joist 3 preferably is supported by the joist hanger 2.

Preferably, the first and second back plate members 9 have first and second top edges 24, respectively. The first and second back faces 10 of the first and second back plate members 9 preferably interface with the front face 7 of the first panel 6 of the one or more panels 6 below the first plurality of fasteners 5 that pass through the first and second back faces 10 and the one or more panels 6 and into the structural support member 4. Preferably, the interface between first and second back face 10 of the first and second back plate member 9 and the front face 7 of the first panel 6 of the one or more drywall panels 6 extends at least three times as far from the first and second top edges 24 of the first and second back plates 24 as any of the first plurality of fasteners 5.

As shown in figures 4 and 5, the first back plate member 9 preferably has a first top edge 24, a first bottom edge 25, a first substantially vertical inner edge 20, a first outer edge 21 substantially parallel to the first substantially vertical inner edge 20 near the first top edge 24 and converging toward the substantially vertical inner edge 20 near the bottom edge 25, a first back face 10 in parallel registration with the front face 7 of a first panel 6 of the one or more panels 6, 24121529 and a first plurality of fastener openings 26 between the parallel portions of the first substantially vertical inner edge 20 and the first outer edge 21. Preferably, the second back plate member 9 also has a second top edge 24, a second bottom edge 25, a second substantially vertical inner edge 20, a second outer edge 21 substantially parallel to the second substantially vertical inner edge 20 near the second top edge 24 and converging toward the substantially vertical inner edge near the bottom edge 25, a second back face 10 in parallel registration with the front face 7 of a first panel 6 of the one or more panels 6, and a second plurality of fastener openings 26 between the parallel portions of the second substantially vertical inner edge 20 and the second outer edge 21.

The first and second back faces 10 of the first and second back plate members 9 preferably interface with the front face 7 of the first panel 6 of the one or more panels 6 adjacent and between each of the first plurality of fasteners 5 that pass through the first and second back faces 10 and the one or more panels 6 and into the structural support member 4.

Substantially all of the first and second back faces 10 of the first and second back plate members 9 preferably interfaces with the front face 7 of the first panel 6 of the one or more panels 6. Preferably, the back face 8 of one panel 6 of the one or more panels 6 interfaces with the front face 16 of the first structural support member 4 where the first plurality of fasteners 5 attach the joist hanger 2 to the structural support member 4 through the one or more panels 6. 24121529

Claims (16)

CLAIMS :

1. A connection utilizing a joist hanger to attach a first generally horizontal joist to a first generally horizontal wood structural support member and one or more generally vertical drywall panels, the connection comprising: a. the one or more drywall panels, each having a front face, a back face opposite the front face, the one or more drywall panels being drywall panels such that they have negligible dowel bearing strength compared to the first wood structural support member; b. one or more cooperating cantilevers that hold the joist hanger away from the first generally horizontal wood structural support member; c. the first wood structural support member having significant dowel bearing strength compared to the one or more drywall panels, the first wood structural support member supporting the one or more cooperating cantilevers; d. the joist; and e the joist hanger, the joist hanger comprising: i. one or more back plate members with a first back face in parallel registration with the front face of a first panel of the one or more drywall panels; ii. one or more side members connected to the one or more back plate members; wherein: (a) the one or more cooperating cantilevers pass through the one or more drywall panels and are supported by the first wood structural support member and support the joist hanger; (b) the joist is supported by the joist hanger; and (c) the one or more drywall panels are between the joist and the first wood structural support member.

2. The connection of claim 1 wherein: a. the one or more back plate members have a first top edge, a first bottom edge, a first generally vertical inner edge, a first outer edge generally parallel to the first generally vertical inner edge near the first top edge and converging toward the generally vertical inner edge near the bottom edge, a first back face in parallel registration with the front face of a first panel of the one or more drywall panels, 26399245 and a first plurality of fastener openings between the parallel portions of the first generally vertical inner edge and the first outer edge.

3. The connection of claim 1 wherein: a. the joist hanger has a seat member connected to the one or more side members, wherein: i. the joist rests on the seat member.

4. The connection of claim 1 wherein: a. each of the one or more drywall panels has a top edge face; b. the joist hanger has one or more top flanges; wherein: i. the one or more top flanges extend over the top edge faces of the one or more drywall panels.

5. The connection of claim 4 wherein: a. the one or more top flanges are fastened to the wood structural support member.

6. The connection of claim 5 wherein: a. the wood structural support member has a top face; and b. the one or more top flanges are fastened to the top face of the wood structural support member.

7. The connection of claim 6 wherein: a. the one or more top flanges are fastened to the structural support member with a plurality of fasteners.

8. The connection of claim 7 wherein: a. the wood structural support member is a top plate having one or more parts, and the top plate has a height less than one-third the height of the joist hanger.

9. The connection of claim 8 wherein: a. the parts of the top plate are two pieces of 2x4 dimensional lumber.

10. The connection of claim 1 wherein: 26399245 a. each of the one or more drywall panels has a top edge face; b. the wood structural support member has a top face; and c. the top edge face of each of the one or more drywall panels is located at the level of the top face of the wood structural support member or above the top face of the wood structural support member.

11. The connection of claim 1 wherein: a. the joist hanger has one or more top flanges that are fastened to the wood structural support member.

12. The connection of claim 11 wherein: a. the wood structural support member has a top face; and b. the one or more top flanges are fastened to the top face of the wood structural support member.

13. The connection of claim 12 wherein: a. the one or more top flanges are fastened to the structural support member with a plurality of fasteners.

14. The connection of claim 13 wherein: a. the wood structural support member is a top plate having one or more parts, and the top plate has a height less than one-third the height of the joist hanger.

15. The connection of claim 14 wherein: a. the parts of the top plate are two pieces of 2x4 dimensional lumber. 26399245

16. The connection of claim 11 wherein: a. each of the one or more drywall panels has a top edge face; b. the wood structural support member has a top face; and c. the top edge face of each of the one or more drywall panels is located at the level of the top face of the wood structural support member or above the top face of the wood structural support member. Simpson Strong-Tie Company, Inc. By the Attorneys for the Applicant SPRUSON & FERGUSON Per: 26399245