Advice on adding insulation to an existing sloped roof void

[griffta]

Hi all,

I wonder if I could ask for some advice.

I have a sloping ceiling over the staircase in the all. This spans from the ground floor ceiling height to the 1st floor ceiling level. (See photo)


The house costs a small fortune to heat, and the hall is one of the coldest ares. I wonder if it would be possible for me to add insulation in the sloping roof void to reduce the heat loss over this large area?

I'm concerned about the need for adequate ventilation to prevent condensation build up, however I really can't determine how this might apply to my roof.

I can only access the sloping roof void from the main loft, as the sloping roof continues on to meet the ridge of the main roof above the 1st floor ceiling height.

The house was built in the 1930s and has a tiled roof without any membrane under the tiles.

I've added some photos of the roof void, any advice would be greatly appreciated.

Thanks,

Matt.

 

[^woody^]

Yeah, slide some Celotex down there - 60 or 70mm or as much as you can - flat against the plasterboard. You'll need to make sure you fill all the gaps properly as if there are any large gaps, you could create a cold area and then this can (not always but potentially) cause dark pattern staining on the plaster ceiling. Sometimes with this type of roof though, you will get some staining in any case due to the cold rafters, and if that happens, then the only way to stop it is to put a thin piece of insulation on the underside of the ceiling and then re board and plaster

And insulate the rest of the ceiling in the loft with 300mm quilt.

With those tiles you may find that you have enough gaps and draught to keep condensation down

 

[griffta]

Many thanks Woody - great advice, I've got my evenings planned for this week!