I know about the diminishing returns on loft insulation but trying to make as many thermal improvements as possible. Burning over 80kWh of gas per day to maintain 17.5 deg C in this cold weather! Windows are UPVC double glazed but 1987 vintage so probably not helping.
One section of loft (16m2) is boarded, underneath the board is 100mm Knauf Glass Mineral Wool on top of the old fibreglass (flat as a pancake) compressed into the 70mm space.
I want to keep this area boarded and not too high, is it worth the cost of adding 100mm PIR on top or will it only give minimal energy savings?
One section of loft (16m2) is boarded, underneath the board is 100mm Knauf Glass Mineral Wool on top of the old fibreglass (flat as a pancake) compressed into the 70mm space.
I want to keep this area boarded and not too high, is it worth the cost of adding 100mm PIR on top or will it only give minimal energy savings?