Can I recess downlighters into Recticel PIR insulation boards?

Category: DIY

General best practice in such scenarios would be to include for a battened service zone to avoid compromising the performance both the insulation and the vapour control layer. The required depth of this “void” should be determined by the requirements of the specific lighting manufacturer. 

If this is not suitable and the lighting needs to be recessed, then advice should be sought from the downlighter manufacturer.

For more information regarding this, an information document can be found within the IMA Resource Centre on the 'Use of downlighters, recessed lights or spotlights and PIR PUR insulation' here.