Have the lighting fittings have been successfully tested, or assessed (by a recognised expert), in conjunction with the proposed Armstrong ceiling?
If they have not, you should speak to the relevant building control and/or fire authority and obtain approval before commencing the Armstrong ceiling installation. You cannot rely on unauthorised methods, such as overlaying or surrounding the lighting fittings with ‘fire blankets’, mineral wool pads or offcuts from the ceiling tiles, to assume that the ceiling’s fire resistance will not be compromised.
