If you plan to use the loft or attic for storage, you will want to lay boards over the joists. Unfortunately, if you only insulate between the joists before doing this, the insulation won’t be thick enough.
To get enough insulation you can do the following:
• Insulate between the joists with mineral wool and then lay rigid insulation boards on top, with wooden boarding on top of that. You can buy insulation board pre-bonded to floor boarding to make the job easier. Or
• raise the level of the floor so you can fit enough mineral wool beneath the new floor level.
Either way, make sure you don’t squash the mineral wool when you fit the boards on top as this this will reduce its insulation value. *Energy saving trust,
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