Insulating an internal garage wall

[The_Gza]

Need to pick the collective brain on this one. I'd like to add some insulation to this wall - our kitchen is the other side of the wall and we seem to be getting an excessive amount of cold transferring through the wall and into the kitchen (there's no cavity in between, just the solid blockwork).

My initial plan was just to use CLS timber to frame this out and then fill with normal fibreglass type insulation, with either fireline or normal plasterboard on top. However, depending on who I've spoken to, I've had a different answer on whether this is the best way to do it. Some have suggested using Kingspan/Celotex type insulation boards instead, others insulated plasterboard. Here's a pic of the wall in question. It's about to get our new boiler mounted there shortly, so I'm looking to get it boarded out soonest. It doesn't need to be pretty (and it'll be me that's doing it, so unlikely to be anyway!), I don't want to take too much space out of the existing garage, and ideally not spend a fortune on it either!



Any thoughts on the best way to go about this?

[The_Gza]

Thanks for input all - ended up going with the suggested CLS for framing, 25mm Celotex and Fireline plasterboard. I wanted something substantial for the boiler to mount to, so just insulated plasterboard and the thermal blocks felt a bit too risky. Considered Ply as well, but the fire resistant benefits of the plasterboard were more important - I'm less likely to be hanging things off that wall either. I'll stick up some pics when I'm finished!

[The_Gza]

Quick update - here's the wall ready to start


Most of the celotex in:


Nearly ready for plasterboard: