Insulation upgrade for floor

[milese]

Hi,

I'm upgrading a 27 year old conservatory to a more permanent structure.

The current chipboard floor has some water damage which needs replacing so whilst I'm at it questioning whether worth replacing the insulation.

It appears to just be sitting onto of 25mm of blue XPS insulation which is on top of a concrete slab with no signs of any foil or membrane. The concrete slab is on a brick foundation with air gap beneath as on a slope.

I don't really want to increase the floor height more than a touch.

Is it worth replacing the insulation, if so is PIR the right product?

Thanks.

 

[Mr diy a lot.]

Assuming the conservatory was not installed by cowboys, there is probably is a membrane but it will be underneath the poured concrete pad and will fold up onto the top of the dpc so may not be easily visible. You will know if existing conservatory has been installed by a cowboy by the general finish of everything. If no leaks in 27 years then it’s was probably done correctly. Pir is the very best product you can put in the space for thermal values but the trade off is it does not have as much compression strength as xps products. There is no doubt that in 27 years insulation technology has moved on but whether you would see a noticeable improvement from swapping this product out (unless you want to raise the floor some more) is hard to say.