IHS
I-Joist Hole Support
The IHS is designed to strengthen I-joists when holes are required to be cut in locations not normally permitted.
- Allows holes to be cut 50mm from bearing point, which allows services to run close to external walls.
- Variable hole sizes from 150mm to a maximum width of 250mm.
- Supplied as 2 sets of 2 interlocking plates (1 set per side of I-joist) which always allows the IHS to be fitted, even when services are already in-situ.
- Helps to eliminate expensive and time consuming joist trimming for SVP (soil vent pipe) runs.
- Can be used on single and double ply I-joists.
Service class 2
Electrogalvanized steel 20 µm
Product Details
Images
Features
Materials
- Pre-galvanised mild steel
Technical Data
Dimensions
IHS Product Dimensions
| References | Joist Size [mm] | Hanger Dimensions [mm] | Connector Holes | Fasteners | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A | B | C | D1 | D2 | t | Ø4 | Triangular | 150 mm Bracket Opening | 250mm Bracket Opening | ||||
| Specification | Quantity | Quantity | Specification | ||||||||||
| IHS195 | 195-200 | 150 | 250 | 191 | 150 | 250 | 1.5 | 10 | 3 | 3.75x30mm | 24 | 32 | 3.75x30mm |
| IHS220 | 220-225 | 150 | 250 | 216 | 150 | 250 | 1.5 | 10 | 3 | 3.75x30mm | 24 | 32 | 3.75x30mm |
| IHS235 | 235 | 150 | 250 | 231 | 150 | 250 | 1.5 | 10 | 3 | 3.75x30mm | 24 | 32 | 3.75x30mm |
| IHS240 | 240-245 | 150 | 250 | 236 | 150 | 250 | 1.5 | 10 | 3 | 3.75x30mm | 24 | 32 | 3.75x30mm |
| IHS300 | 300-302 | 150 | 250 | 296 | 150 | 250 | 1.5 | 10 | 3 | 3.75x30mm | 24 | 32 | 3.75x30mm |
1) Use 3.75x30mm Square Twist Nails
2) Number of fasteners is per hole in joist
IHS Performance: James Jones (JJI A+) I-Joist
| References | Joist Type | Joist Height [mm] | Max. allowable hole size with IHS (d x w) | Shear Capacity at Location of IHS [kN] | |||
|---|---|---|---|---|---|---|---|
| Permissible loads (Intermediate Floor Joist Applications) | Characteristic capacity | ||||||
| Vhole (IHS Installed) | Vk,hole (IHS Installed) | ||||||
| 1 ply | Double Ply | 1 ply | Double Ply | ||||
| IHS195 | JJI-Joist A+ (47mm) | 195 | 100 x 250 | 2.62 | 3.49 | 3.38 | 8.51 |
| IHS220 | JJI-Joist A+ (47mm) | 220 | 120 x 250 | 2.76 | 3.72 | 6.80 | 9.06 |
| IHS235 | JJI-Joist A+ (47mm) | 235 | 140 x 250 | 2.9 | 3.86 | 7.06 | 9.42 |
| IHS240 | JJI-Joist A+ (47mm) | 245 | 150 x 250 | 2.97 | 3.96 | 7.25 | 9.66 |
| IHS300 | JJI-Joist A+ (47mm) | 300 | 200 x 250 | 3.41 | 4.55 | 8.32 | 11.09 |
IHS Performance: James Jones (JJI B+) I-Joist
| References | Joist Type | Joist height [mm] | Max. allowable hole size with IHS (d x w) | Shear Capacity at Location of IHS [kN] | |||
|---|---|---|---|---|---|---|---|
| Permissible loads (Intermediate Floor Joist Applications) | Characteristic capacity | ||||||
| Vhole (IHS Installed) | Vk,hole (IHS Installed) | ||||||
| 1 ply | Double Ply | 1 ply | Double Ply | ||||
| IHS220 | JJI-Joist B+ (63 mm) | 220 | 120 x 250 | 3.07 | 4.10 | 7.49 | 9.98 |
| IHS235 | JJI-Joist B+ (63 mm) | 235 | 140 x 250 | 3.18 | 4.23 | 7.74 | 10.32 |
| IHS240 | JJI-Joist B+ (63 mm) | 245 | 150 x 250 | 3.25 | 4.33 | 7.91 | 10.55 |
| IHS300 | JJI-Joist B+ (63 mm) | 300 | 200 x 250 | 3.67 | 4.89 | 8.95 | 11.93 |
IHS Performance: James Jones (JJI C) I-Joist
| References | Joist Type | Joist Height [mm] | Max. allowable hole size with IHS (d x w) | Shear Capacity at Location of IHS [kN] | |||
|---|---|---|---|---|---|---|---|
| Permissible loads (Intermediate Floor Joist Applications) | Characteristic capacity | ||||||
| Vhole (IHS Installed) | Vk,hole (IHS Installed) | ||||||
| 1 ply | Double Ply | 1 ply | Double Ply | ||||
| IHS195 | JJI-Joist C (72 mm) | 195 | 100 x 250 | 3.06 | 4.08 | 7.46 | 9.95 |
| IHS220 | JJI-Joist C (72 mm) | 220 | 120 x 250 | 3.22 | 4.30 | 7.85 | 10.47 |
| IHS235 | JJI-Joist C (72 mm) | 235 | 140 x 250 | 3.33 | 4.43 | 8.11 | 10.81 |
| IHS240 | JJI-Joist C (72 mm) | 245 | 150 x 250 | 3.40 | 4.53 | 8.28 | 11.04 |
| IHS300 | JJI-Joist C (72 mm) | 300 | 200 x 250 | 3.81 | 5.08 | 9.29 | 12.39 |
IHS Performance: James Jones (JJI D) I-Joist
| References | Joist Type | Joist Height [mm] | Max. allowable hole size with IHS (d x w) | Shear Capacity at Location of IHS [kN] | |||
|---|---|---|---|---|---|---|---|
| Permissible loads (Intermediate Floor Joist Applications) | Characteristic capacity | ||||||
| Vhole (IHS Installed) | Vk,hole (IHS Installed) | ||||||
| 1 ply | Double Ply | 1 ply | Double Ply | ||||
| IHS220 | JJI-Joist D (97 mm) | 220 | 120 x 250 | 3.62 | 4.83 | 8.83 | 11.77 |
| IHS235 | JJI-Joist D (97 mm) | 235 | 140 x 250 | 3.72 | 4.96 | 9.07 | 12.10 |
| IHS240 | JJI-Joist D (97 mm) | 245 | 150 x 250 | 3.79 | 5.05 | 9.24 | 12.32 |
| IHS300 | JJI-Joist D (97 mm) | 300 | 200 x 250 | 4.2 | 5.60 | 10.24 | 13.66 |
IHS Performance: Masonite H (47mm Flange) I-Joist
| References | Joist Type | Joist Height [mm] | Max. allowable hole size with IHS (d x w) [mm] | Shear Capacity at Location of IHS [kN] | |||
|---|---|---|---|---|---|---|---|
| Permissible loads (Intermediate Floor Joist Applications) | Characteristic capacity | ||||||
| Vhole (IHS Installed) | Vk,hole (IHS Installed) | ||||||
| 1 Ply | Double Ply | 1 Ply | Double Ply | ||||
| IHS220 | H | 220 | 120 x 250 | 2.25 | 2.7 | 7.56 | 9.08 |
| IHS240 | H | 240 | 140 x 250 | 2.45 | 2.94 | 8.24 | 9.89 |
| IHS300 | H | 300 | 200 x 250 | 3.05 | 3.66 | 10.26 | 12.31 |
IHS Performance: Masonite HM (60mm Flange) I-Joist
| References | Joist Type | Joist Height [mm] | Max allowable hole size with IHS (d x w) [mm] | Shear Capacity at Location of IHS [kN] | |||
|---|---|---|---|---|---|---|---|
| Permissible loads (Intermediate Floor Joist Applications) | Characteristic capacity | ||||||
| Vhole (IHS Installed) | Vk,hole (IHS Installed) | ||||||
| 1 Ply | Double Ply | 1 Ply | Double Ply | ||||
| IHS220 | HM | 220 | 120 x 250 | 2.25 | 2.7 | 7.56 | 9.08 |
| IHS240 | HM | 240 | 140 x 250 | 2.45 | 2.94 | 8.24 | 9.89 |
| IHS300 | HM | 300 | 200 x 250 | 3.05 | 3.66 | 10.26 | 12.31 |
IHS Performance: Masonite HI (70mm flange) I-Joist
| References | Joist Type | Joist Height [mm] | Max. allowable hole size with IHS (d x w) [mm] | Shear Capacity at Location of IHS [kN] | |||
|---|---|---|---|---|---|---|---|
| Permissible loads (Intermediate Floor Joist Applications) | Characteristic capacity | ||||||
| Vhole (IHS Installed) | Vk,hole (IHS Installed) | ||||||
| 1 Ply | Double Ply | 1 Ply | Double Ply | ||||
| IHS220 | HI | 220 | 120 x 250 | 2.25 | 2.7 | 7.56 | 9.08 |
| IHS240 | HI | 240 | 140 x 250 | 2.45 | 2.94 | 8.24 | 9.89 |
| IHS300 | HI | 300 | 200 x 250 | 3.05 | 3.66 | 10.26 | 12.31 |
IHS Performance: Masonite HB (97mm flange) I-Joist
| References | Joist Type | Joist Height [mm] | Max. allowable hole size with IHS (d x w) [mm] | Shear Capacity at Location of IHS [kN] | |||
|---|---|---|---|---|---|---|---|
| Permissible loads (Intermediate Floor Joist Applications) | Characteristic capacity | ||||||
| Vhole (IHS Installed) | Vk,hole (IHS Installed) | ||||||
| 1 Ply | Double Ply | 1 Ply | Double Ply | ||||
| IHS220 | HB | 220 | 120 x 250 | 2.3 | 2.7 | 7.6 | 9.1 |
| IHS240 | HB | 240 | 140 x 250 | 2.5 | 2.9 | 8.2 | 9.9 |
| IHS300 | HB | 300 | 200 x 250 | 3.1 | 3.7 | 10.3 | 12.3 |
IHS Performance: MetsaWood (FinnJoist 45mm) I-Joist
| References | Joist Type | Joist Height [mm] | Max. allowable hole size with IHS (d x w) | Shear Capacity at Location of IHS [kN] | |||
|---|---|---|---|---|---|---|---|
| Permissible loads (Intermediate Floor Joist Applications) | Characteristic capacity | ||||||
| Vhole (IHS Installed) | Vk,hole (IHS Installed) | ||||||
| 1 ply | Double Ply | 1 ply | Double Ply | ||||
| IHS195 | FJI 45 | 200 | 100 x 250 | 2.25 | 2.63 | 5.41 | 6.31 |
| IHS220 | FJI 45 | 220 | 125 x 250 | 2.62 | 3.05 | 6.28 | 7.33 |
| IHS240 | FJI 45 | 240 | 145 x 250 | 2.93 | 3.41 | 7.02 | 8.19 |
| IHS300 | FJI 45 | 300 | 200 x 250 | 3.53 | 4.12 | 8.48 | 9.89 |
IHS Performance: MetsaWood (FinnJoist 53mm) I-Joist
| References | Joist Type | Joist Height [mm] | Max. allowable hole size with IHS (d x w) | Shear Capacity at Location of IHS [kN] | |||
|---|---|---|---|---|---|---|---|
| Permissible loads (Intermediate Floor Joist Applications) | Characteristic capacity | ||||||
| Vhole (IHS Installed) | Vk,hole (IHS Installed) | ||||||
| 1 ply | Double Ply | 1 ply | Double Ply | ||||
| IHS195 | FJI 58 | 200 | 100 x 250 | 2.40 | 2.80 | 5.75 | 6.71 |
| IHS220 | FJI 58 | 220 | 125 x 250 | 2.79 | 3.25 | 6.69 | 7.81 |
| IHS240 | FJI 58 | 240 | 145 x 250 | 3.12 | 3.64 | 7.48 | 8.73 |
| IHS300 | FJI 58 | 300 | 200 x 250 | 3.76 | 4.39 | 9.09 | 10.54 |
IHS Performance: MetsaWood (FinnJoist 69mm) I-Joist
| References | Joist Type | Joist Height [mm] | Max. allowable hole size with IHS (d x w) | Shear Capacity at Location of IHS [kN] | |||
|---|---|---|---|---|---|---|---|
| Permissible loads (Intermediate Floor Joist Applications) | Characteristic capacity | ||||||
| Vhole (IHS Installed) | Vk,hole (IHS Installed) | ||||||
| 1 ply | 1 ply | Double Ply | Double Ply | ||||
| IHS195 | FJI 70 | 200 | 100 x 250 | 2.48 | 2.89 | 5.95 | 6.94 |
| IHS220 | FJI 70 | 220 | 125 x 250 | 2.88 | 3.36 | 6.91 | 8.06 |
| IHS240 | FJI 70 | 240 | 145 x 250 | 3.22 | 3.76 | 7.73 | 9.02 |
| IHS300 | FJI 70 | 300 | 200 x 250 | 3.89 | 4.53 | 9.32 | 10.88 |
IHS Performance: MetsaWood (FinnJoist 96mm) I-Joist
| References | Joist Type | Joist Height | Max. allowable hole size with IHS (d x w) | Shear Capacity at Location of IHS [kN] | |||
|---|---|---|---|---|---|---|---|
| Permissible loads (Intermediate Floor Joist Applications) | Characteristic capacity | ||||||
| Vhole (IHS Installed) | Vk,hole (IHS Installed) | ||||||
| 1 ply | Double Ply | 1 ply | Double Ply | ||||
| IHS195 | FJI 89 | 200 | 100 x 250 | 2.48 | 2.89 | 5.95 | 6.94 |
| IHS220 | FJI 89 | 220 | 125 x 250 | 2.88 | 3.36 | 6.91 | 8.06 |
| IHS240 | FJI 89 | 240 | 145 x 250 | 3.22 | 3.76 | 7.73 | 9.02 |
| IHS300 | FJI 89 | 300 | 200 x 250 | 3.89 | 4.53 | 9.32 | 10.88 |
IHS Performance: Steico (SJL 45mm) I-Joist
| References | Joist Type | Joist Height | Max. allowable hole size with IHS (d x w) | Shear Capacity at Location of IHS [kN] | |||
|---|---|---|---|---|---|---|---|
| Permissible loads (Intermediate Floor Joist Applications) | Characteristic capacity | ||||||
| Vhole (IHS Installed) | Vk,hole (IHS Installed) | ||||||
| 1 ply | Double Ply | 1 ply | Double Ply | ||||
| IHS195 | - | - | - | - | - | - | - |
| IHS220 | SJL 45 | 220 | 130 x 250 | 1.50 | 2.11 | 5.93 | 8.30 |
| IHS240 | SJL 45 | 240 | 150 x 250 | 1.62 | 2.27 | 6.38 | 8.93 |
| IHS300 | SJL 45 | 300 | 200 x 250 | 1.95 | 2.73 | 7.68 | 10.75 |
IHS Performance: Steico (SJL 60mm) I-Joist
| References | Joist Type | Joist Height [mm] | Max. allowable hole size with IHS (d x w) | Shear Capacity at Location of IHS [kN] | |||
|---|---|---|---|---|---|---|---|
| Permissible loads (Intermediate Floor Joist Applications) | Characteristic capacity | ||||||
| Vhole (IHS Installed) | Vk,hole (IHS Installed) | ||||||
| 1 ply | Double Ply | 1 ply | Double Ply | ||||
| IHS195 | - | - | - | - | - | - | - |
| IHS220 | SJL 60 | 220 | 130 x 250 | 1.49 | 2.09 | 5.88 | 8.23 |
| IHS240 | SJL 60 | 240 | 150 x 250 | 1.60 | 2.25 | 6.32 | 8.85 |
| IHS300 | SJL 60 | 300 | 200 x 250 | 1.93 | 2.70 | 7.59 | 10.62 |
IHS Performance: Steico (SJL 90mm) I-Joist
| References | Joist Type | Joist Height [mm] | Max. allowable hole size with IHS (d x w) | Shear Capacity at Location of IHS [kN] | |||
|---|---|---|---|---|---|---|---|
| Permissible loads (Intermediate Floor Joist Applications) | Characteristic capacity | ||||||
| Vhole (IHS Installed) | Vk,hole (IHS Installed) | ||||||
| 1 ply | Double Ply | 1 ply | Double Ply | ||||
| IHS195 | - | - | - | - | - | - | - |
| IHS220 | SJL 90 | 220 | 130 x 250 | 1.48 | 2.07 | 5.83 | 8.16 |
| IHS235 | - | - | - | - | - | - | - |
| IHS240 | SJL 90 | 240 | 150 x 250 | 1.59 | 2.22 | 6.26 | 8.76 |
| IHS300 | SJL 90 | 300 | 200 x 250 | 1.90 | 2.66 | 7.49 | 10.48 |
Installation
Installation
Installation
- Each IHS consists of 2 sets of 2 interlocking plates with one set required for each side of the I-joist.
- The outer edge of the holes cut into the web of the I-joist can be a minimum of 50mm from the inner face of the blockwork.
- Holes can be cut into the web of the I-joist before or after installation of the IHS.
- Holes must fit within the internal aperture of the IHS.
- Place the IHS onto the I-joist so that the top and bottom sliding flanges are aligned vertically central onto the top and bottom chords of the I-joist.
- Open or close the IHS to the required width, ensuring that the two sections overlap by at least one row of nails (minimum overlap of 45mm).
- Install 3.75x30mm square twist nails through all round holes into the top and bottom chords of the I-joist.
- Repeat the above steps to install plates on the other side of the I-joist, completing the installation.
