Required insulation thickness according to Grade Building envelope			Thickness (mm)
			A	B	C	D
Exterior wall	Adjacent to outside directly		85	100	115	130
Exterior wall	Adjacent to outside indirectly		60	70	80	90
Floor of the lowest floor	Adjacent to outside directly	Floor heating	105	125	140	160
	Adjacent to outside directly	No floor heating	75	90	100	115
	Adjacent to outside indirectly	Floor heating	70	80	90	105
	Adjacent to outside indirectly	No floor heating	50	55	65	70
Roof	Adjacent to outside directly		160	190	215	245
Roof	Adjacent to outside indirectly		105	125	145	160
Sidewall of apartment building			120	140	160	175
Floor between levels	Floor heating		30	35	45	50
Floor between levels	Other		20	25	25	30