The fee totally is dependent as per the thickness of the froth installed and the surface discipline that desires sheathing. The NIA has standardised the per rectangular meter cost which ranges from 20 to 50 kilos.
Skinny layers rate less whilst thicken insulation fees extra. Closed cell insulation is more expensive than open mobilephone.
The service cost varies depending on the next:
obstacle in installation.
Roof style; its present and damages.
Repair work if needed, and many others.