Improving Cavity Wall Insulation

[richo106]

Hi

 

We are renovating a bungalow and just starting to get down to some finer details regarding insulation. Obviously I would like to insulate the property as well as I can.

 

Exterior insulation is not possible in our design, so we are planning to install 50mm PIR on the internal walls, however the cavity between the bricks is only 70-80mm and I'm almost certain there is some form of blown insulation in there (I could see some white fluffy insulation when I took a window board off)

 

My question is how effective is this insulation? Is there a way of improving this insulation further during the build?

 

Many Thanks

[A_L]

  On 26/11/2021 at 11:50, richo106 said:

My question is how effective is this insulation? Is there a way of improving this insulation further during the build?

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Looks like you have a blown mineral fibre, e.g. https://www.knaufinsulation.co.uk/products/supafil-40 With a thermal conductivity around 0.04W/m.K it is good enough that their is no cost effective replacement or anything you can do to improve it.

[richo106]

  On 26/11/2021 at 14:27, A_L said:

 

Looks like you have a blown mineral fibre, e.g. https://www.knaufinsulation.co.uk/products/supafil-40 With a thermal conductivity around 0.04W/m.K it is good enough that their is no cost effective replacement or anything you can do to improve it.

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Thank you