We have a cellar in our Victorian terraced home. The living / dining room are freezing in winter and we are thinking of insulating the ceiling in the cellar to prevent this. Can we use normal loft insulation which we then board over with hardboard. Is this ok and will ita cause damp / prevention of airflow? We do have an airbrick at one end of the cellar and are not going to block it in any way. Will this suffice?
If the cellar is vented then it will be the inverse of a roof. I would suggest using a polyurethane board with silver foil to be sides (kingspan or celotex) and this has better insulation properties so less thickness is required compared to quilt to achieve same result. Plus it is rigid so you cut it to size and fit it tight between the floor joists thus boarding is not required. (you can put nails in side of joists to support insulation if it is necessary.
Are you in Australia? please confirm because better advice is possible if you identify your location., I must say that the most appropriate passive cooling strategies for your home including orientation, ventilation, windows, shading, insulation and thermal mass are determined by climate, so first identify your climate zone. You can then apply the more detailed advice!
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