Insulation in sloping ceiling (1930s build house)

[kevinh79]

My loft space is traditional build (i.e. no trusses) and has no felt, basically i can see the rafters and roof tiles when in the loft. It also has a raised tie which means the upstairs rooms have a sloping ceiling section. These sloping ceiling sections are not insulated and get major condensation during winter.

What is best way of insulating the sloping ceiling section? Most of the areas I can get to inside the loft but there are some areas that are not accessable.

 

[SASroofer]

the easiest way would be to strip the lower courses of tiles from the eaves and insulate from there. Depending on what tile/slate you have up there.

 

[kevinh79]

Thanks. What would be the best type of insulation - something like Celotex or Kingspan? Or Something else?

 

[joe-90]

If space isn't critical it's often easier to fit insulated plasterboard over the sloping section from below.

 

[freddiemercurystwin]

Thanks. What would be the best type of insulation - something like Celotex or Kingspan? Or Something else?

Yes, one of these, fit the maximum thickness you can whilst leaving a 50mm air gap between the underside of the tiles and insulation. We assume you have good ventilation at the eaves?

 

[noseall]

Our latest raked ceiling involved 100mm betwixt (150mm deep rafters) with another 50mm across (underdraw) the rafters.

Next year it will be 100mm + 75mm.

The year after will be 100mm + 100mm and we will all be scratching our heads looking for dry wall fixings that are 140mm long!