Insulation in to the eaves

[JamesHughes]

Hello all,

My house has very high ceilings, meaning there is a diagonal part of the ceiling where its parallel with the roof.

Using a I/R temperature reader from inside the room, these parts of the ceiling are 2-3degs colder than the main flat part of the ceiling. Looking in the loft shows 6" insulation on the flat, but it doesn't go down the gap in to the eaves - hence the lower temp.

Now I know I should be careful about pushing insulation down the gap, as this is where the ventilation for the roof space comes in, but could I, for example, alternate gaps so I still get ventilation but an insulation improvement, or is there another reason why insulation shouldn't touch the roof felting etc?

TIA

James

 

[noseall]

the only effective way to insulate a 'raked' ceiling is by using a rigid insulation board such as cellotex or kingspan. this way you could leave a 25mm airgap between the insulation board and the tile battens/felt.

to achieve modern 'u' values further insulation would be required underdrawn, across the rafters i.e 25mm cellotex or insulated plasterboard.

 

[JamesHughes]

Thanks Noseall,

Just one question - what do you mean by underdrawn - is this where you attach the insulation under the ceiling rather than on top?

James

 

[noseall]

yep!

across the underside of the timbers.