Energy saving trust significantly downgrades energy saving estimates

[Mark]

The only difference I acutally noticed after insulating the loft was that it stayed too hot in the bedrooms at night in the summer.

[sm_jamieson]

Thats assuming 100mm layed seamlessly across the whole loft. Usually the 100mm is layed between the joists resulting in quite a few air gaps, in which case laying another layer at right angles over joists makes a lot of difference. Simon.

[Capitol]

Mine has 19mm chipboard on top + loads of junk!

[ARW]

You could probably make better savings by just adding TRVs, timeclocks and a room stat etc to old boiler setups and keep the old boiler.

[John Rumm]

and pump overrun if its not already got it...