A car here which has some owner enthusiast diy work done to it, in prep for a bigger turbo being fitted/mapped here etc... Unfortunately, a poor choice of heat shielding material against the bulkhead, and OE heatshield removed, would have left the car as a fire hazard if it had been used and left there.
Do not use Household sticky back foamed silver foil fronted heat reflective material for an automotive heatshield.. this material is what you would stick behind household radiators to reflect their heat off the walls.
anyhows.. see below what happens when it gets hot vs some Actual Heatsheild materials like should be used in the engine bay..
What not to use below
Aluminised Fibreglass Cloth-aluminised burns off but fabric remains intact
3 layer embossed aluminium/ceramic composite
Use the Appropriate materials for your builds guys..