loft insulation

[ronald]

Hi My current loft insulation is 4 inches thick, the depth of the beams, then floored. How much difference to my heat loss will laying another 4 inches of insulation on top of the flooring make? Thanks, Ron

[Andy Hall]

Some, but not nearly as much as if you insulate the walls if they are not already and are cavity types.

[kcr]

It does make a huge difference, but cavity wall insulation is also good. The house stays warmer in winter and doesn't get as hot in the summer. I am pleased with both lots of insulation.

[Steven Campbell]

I was looking for loft insulation the other month and every different brand I picked up stated it wasn't suitable for flooring to be put on top!! I take it there is stuff out there?

Steven.

[dennis]

Not much.. If you have a big house you might save £40-£50 a year but probably much less. Doubling the thickness will halve the loss, but the loss is already much less than an un-insulated house. Unless you get a grant consider spending it on something else.

[Fergus O'Rourke]

Can anyone point me to online material which makes the above and related points in a comprehensive, organised and methodical way ?