Hi
I am installing a warm roof on my extension, I have a load of black polythene I used for the damp proof layer under the concrete floor, can I use this for the VCL or does it need to be a special thickness?
Thanks
I am installing a warm roof on my extension, I have a load of black polythene I used for the damp proof layer under the concrete floor, can I use this for the VCL or does it need to be a special thickness?
Thanks