Are there wall insulation materials that can stop incoming microwaves?
Some insulation materials that look like metallised plastic do screen against microwaves, some do not! There are too many brands and types (models are changed from time to time, which may well have different properties to the ones tested) to be able to provide a definitive list of ones that do and ones that don’t. You often cannot tell by looking at them. The only way to find out for certain is to measure the fields with a suitable instrument before screening large areas.
