4.3 - ATTIC
  Number of households by year of construction
1950 – 1969 1970 – 1979 1980 – 1989
Dwelling has an attic
Yes 1,508,998 A 1,419,764 A 1,225,660 A
No 250,996 A 258,860 A 268,198 A
Don't know U U U
Not stated 43,940 M 101,667 M U
Dwelling has an insulated attic
Yes - on the attic floor 1,185,114 A 1,025,160 A 867,367 A
Yes - on the attic walls U U U
Yes - on both the attic floor and walls 132,151 A 143,830 M 123,009 A
No U U U
Don't know U 86,958 M 124,964 M
Not stated 99,291 M 239,544 M 74,072 M

Note:

Due to rounding, the numbers may not add up and may differ slightly among tables.

Legend:

The letter beside each estimate classifies its quality as follows: A–Acceptable, M–Use with caution, U–Too unreliable to be published.

Source:

2011 Survey of Household Energy Use