Stuart Turner boiler heat insulation - replace??

Neil
I've had the same dilemma....you could, of course, ring Stuarts and ask them! In the event, I replaced mine with sheet insulation material - I think it's glass fibre-based, from Blackgates.. Shout if you need more information. --
Chris Edwards (in deepest Dorset) "....there *must* be an easier way!"

Bruce/Polly Engineering list boiler lagging in 2mm and 3mm thicknesses, not imperial but near enough?

In message , neil f writes Are those frayed edges normally exposed? How close are the edges of the insulation to the fire-hole door? What kind of cleading covers the insulation? Depending upon the answers to those questions it may be that sheet balsa wood is a possibility. It is likely to have heat insulation properties at least as good as any available synthetic.
If the boiler is vertical then wood is probably a non-starter. But for horizontal locomotive type boilers with good insulation on the boiler barrel and the firebox wrapper but with minimal or no insulation on the back-head, balsa wood and aluminium foil would be at the top of my list.