Our most popular downlights are now certified by independent partner
for use with timber and metal I-Joists.

Collingwood are the first company to produce a fit-for-purpose, high performance, fire-rated downlight that enabled compliance to Part B of the building regulations. In the period since, we have supplied millions of downlights worldwide.

We have worked, together with independent partners, to test and approve our most popular fire-rated downlights for use with timber and metal I-Joists, complementing our suite of ceiling approvals.

What products are approved?

We have conducted three seperate tests so that we can provide approval for as many of our downlights as possible.

The following downlights are certified to achieve full compliance of 30 minutes in accordance to BS 476 Part 21, BS EN 1363-1:2012 and BS EN 1365-2:2014:

1. H2 Lite.
2. H2 Lite 500.
3. H2 Lite 500 CSW.
4. H2 Pro 550.
5. H2 Pro 550 SPS.
6. H2 Pro 550 CS.

The following downlights are certified to achieve full compliance of 30 minutes in accordance to BS EN 1363-1:2012 and BS EN 1365-2:2014:

1. H2 Lite 400 CSP. 
2. H2 Lite 500 CSP.
3. H4 Lite.
4. H2 Pro 700.
5. H4 Pro 550.
6. H4 Pro 550 SPS.
7. H5 Trimless.
8. H2 Pro Elect.

Most recently, the subsequent downlights have been approved for use with metal I-Joists with full 30 minute compliance in accordance with BS EN 1365-2:2014 and BS EN 1363- 1:2012:

1. H2 Pro 550
2. H2 Pro 700
3. H4 Pro 550
4. H4 Lite 
5. H2 Lite 500 CSW
6. H2 Lite 
7. H2 Lite 500 CSP

Which ceiling systems are approved?

There are many variables which need to be considered when specifying the appropriate floor construction and downlight placement. Please contact us for tailored advice.

The list below provides a selection of highlights, although there may be variation required between downlights:

  • James Jones or Staircraft 220mm + deep I-Joists.
    - 45mm x 47mm flanges.
    - A minimum of 9mm thick OSB board.
  • Positioned at 600mm centres.
  • Covered with 22mm tongue and groove chipboard P5 flooring.
  • A minimum of 15mm British Gypsum (or other pre-approved supplier) Gyproc type A, Tapered Edge (TE) wallboard or 12.5mm Gryproc Fireline.
  • Wolf Systems 219mm easi-joist system
    - 47mm chord depth

What is an I-Joist?

These are purposely engineered to be light and strong, whilst removing the imperfections which can come from natural timbers.

The name comes from the shape. There is a top and bottom flange element with the web in between.

Their common application is within residential floors, roofs and are becoming increasingly popular with their benefits over solid timber joists. Such benefits include the ease of handling due to their light weight, less prone to warping and ease of drilling to install services such as pipes and cables.

Collingwood’s expert team

Contact us today for any questions which you have about this article, our expert team will be happy to help.

Should you have need for advice on lighting design, our team inside The Studio at Collingwood are able to offer expertise throughout the lighting design process, putting together full schemes based around our comprehensive product range.  Detailed client consultation ensures a high quality and tailored service.