MJC

Multiple Joist Connector

The multi joist connector (MJC) allows two I-joists/metal web joists to be fixed together to act as a single unit, transferring the incoming load from the loaded ply to the unloaded ply.
The MJC is an improved solution to the traditional filler block detail, which historically has been time consuming to fit and difficult to check if fitted correctly. It’s simple and effective design allows one size of product to be used on any joist size – regardless of height or width.

Technical Data Sheet

CE Marking

ETA

Service class 2

Electrogalvanized steel 20 µm

Product Details

Images

Features

Materials

Pre-galvanised mild steel

Advantages

Quick and simple to install
Safely joins multiple joists together, allowing them to act as a single unit
Easy to see that MJCs are installed (where as filler blocks are not visible)
One size product fits all joist height and width combinations

Features

The MJC is an improved solution to the traditional filler block detail, which historically has been time consuming to fit and difficult to check if fitted or if fitted correctly. It’s simple and effective design allows one size of product to be used on any joist size – regardless of height or width.

Quick and simple to install.
Safely joins multiple joists together, allowing them to act as a single unit.
Easy to see that MJC’s are installed (where as filler blocks are not visible).
One size product fits all joist height and width combinations.
Just one nail size required: 3.75 x 30mm square twist.

DOP

uk-dop-e20-1071-01.pdf (97.89 KB)

Technical Data

Dimensions

Metal Web Applications - Concentrated Loads

Maximum Incoming Concentrated Load [kN] - Metal Web
Number of MJC's	Safe Working Loads	Characteristic Loads
4	5.3	12.6
8	7.9	18.9

Metal Web Applications - Regular Loads

Maximum Incoming Regular Load [kN] - Metal Web
Number of MJC's	Safe Working Loads	Characteristic Loads
2	2.3	6.3
4	3.5	9.4

I-Joist Applications - Concentrated Loads

Maximum Incoming Concentrated Load [kN] - I-Joists
Number of MJC's	Safe Working Loads		Characteristic Loads
Number of MJC's	LVL Flanges	45mm Solid Sawn Flanges	LVL Flanges	45mm Solid Sawn Flanges
4	6.9	7.6	16.6	15.3
8	10.3	11.4	24.9	22.9

I-Joist Applications - Regular Loads

Maximum Incoming Regular Load [kN] - I- Joists
Number of MJC's	Safe Working Loads		Characteristic Loads
Number of MJC's	LVL Flanges	45mm Solid Sawn Flanges	LVL Flanges	45mm Solid Sawn Flanges
2	3.4	3.2	8.3	7.6
4	5.1	4.8	12.4	11.4

Footnotes

Maximum Incoming Concentrated Load refers to the maximum concentrated load that can be applied when the MJC's are installed either side of the incoming load
Number of MJC's equally spaced about the incoming load
Maximum Incoming Regular Load refers to the maximum load that can be applied at regular intervals along the supporting timber
Number of MJC's between each incoming load

Installation

Position the MJCs onto the first joist, ensuring that they are centred about the incoming load at 400 c/c (may be adjusted within 10mm each way).

Secure each MJC with 4 No. 3.75 x 30mm Square Twist Nails, 2 No. fasteners into the joists top face (or for the lower flange MJC, the joists bottom face) and 2 no. fasteners into the joists front face, as shown.

Position the second joist ensuring ends are flush and joists are parallel. Secure the joist to the MJC using 4no. 3.75 x 30mm Square Twist Nails per MJC into the top (or bottom flange) as shown.