cavity insulation lower level

[kevinmachell]

Hi everyone. I am building a small ground floor extension. I understand that the cavity needs to be filed with weak concrete from ground up to 2 courses below DPC. My question is,
at what level does the insulation go in ? Does it sit on top of this concrete or start at DPC ?

many thanks
kevin

 

[tony1851]

IIRC it stops three courses below the dpc.

Fill the cavity from the top of the concrete upwards, even though some is below the dpc.

 

[kevinmachell]

many thanks Tony, the reason I asked was because of concern regarding insulation getting wet and allowing moisture to bridge the gap. I suppose it would depend on the type of insulation used ?
kevin

 

[kevinmachell]

what is IIRC please?

 

[tony1851]

what is IIRC please?

If I Remember Correctly.

Don't worry about the insuation getting damp, it has water-repellant coated on to it.

 

[kevinmachell]

many thanks tony.