What to Insulate with between battens?

[jmd1994]

Hi guys so im in the process of installing 2x1 lats the inside of the external walls on my 1905 semi detatched bungalow

The house got a dire EPC rating of E so i was thinking of putting some insulation between the battens, which are set at 400mm centers, before i put up drywall

Whts the best stuff do put in there, on a budget

Thanks

 

[cjard]

On a budget, nothing that will improve your E. Fit 25mm kingspan between (PIR/PUR) and then line with another 50mm of kingspan over, and then fit your drywall sheets.. Then you'd be getting somewhere. What are your heating bills, in £ per year and what fuel do you use?

 

[jmd1994]

Ive never paid a bill in this house, its a renovation project, was just tryna think of the next owner

 

[cjard]

That's a rare and commendable approach! Maybe drop it to 25mm between and 25mm over, then

 

[jmd1994]

Thanks Could i put knauf earthwool between the studs? Seen it on a thread yday and wondered if its commonly done?

 

[John D v2.0]

If you want a different EPC rating just get another report done . It's all tick boxes on a computer, I looked through all the flats in my old block and the ratings and classifications were all over the place.

In seriousness though, if it's an old solid wall, the slightest thing will help a lot. Even 50mm of wool or polystyrene would half the heat loss. 50mm celotex would be more expensive (10x) but twice as good as the wool.