Cavity wall insulation in bricked up door?

[Apnomis]

We are on the verge of having a kitchen diner conversion and as part of the work our window fitter (who is replacing all the windows and doors in the house) is also going to brick up the old kitchen door and replace it with a window so it is ready for when the builders to do the internal work.

However the thing that worries me is that a few years ago we got cavity wall insulation fitted in the house and I was wondering if I should also make sure the new bit of wall is insulated too? We have the silver bead type insulation in the rest of the house.

So my questions are:

Would it cause issues if the new section of wall was not insulated? I've heard talk of cold spots of uninsulated wall causing damp etc or are these just cavity wall insulation scare stories?

If we did get it insulated while it was being built would it matter what type of insulation is used, would it have to be the same silver bead stuff or would any insulation do?

Would this be something you would expect the person building the wall to take care of or is it something I should arrange myself once the work is done?

Is it something I should raise with the window fitter or am I worrying over nothing?

Thanks in advance.

 

[^woody^]

It should be insulated. It won't matter what type you use as long as it's the equivalent of 50mm of fibre quilt, but logic dictates to use full fill fibre bat insulation which will help retain the existing cavity wall fill.

Any proper builder will build it in to the wall as it's built.

 

[Apnomis]

Thanks, that's what I thought - but with it being the window fitter doing the work rather than the builder I just want to make sure he is aware...