However, by placing one layer of aluminium foil on the inside and another on the outside of the newspaper, the insulation properties were identical to the multifoil material.
Figure 4a shows the temperature time data plotted on the same graph as in the previous posting.
To facilitate comparison Fig 4b shows the same curves without the datapoints, but normalised to a common start temperature and start time.
This provides a simple visual comparison of all the experiments and clearly illustrates how multifoil insulation is a very expensive alternative to newspaper and kitchen foil!
Why should only 2 layers of foil have the equivalent effect of the 12 layers used in multifoil? The 10 inner layers of foil have no insulation properties, all the reflective effects are produced by the outside layers.
Attached are some additional results on the insulation properties of newspaper!
Comparison of Celotex insulation material vs superquilt 14 multifoil insulation at heat retention.Experimental data shows that the traditional foam based insulation is twice as superior to the new multifoil despite claims to the contrary.The overall thickness of the combined newspaper layers was between 10mm (base) and 20mm (side). The carton box, and its contents were identical to that described in the previous posting.The only difference between this and previous experiments was a slightly higher external temperature of 23C. In addition I also repeated the experiment with 2 layers of aluminium foil to provide a reflective barrier either side of the 12 layers of newspapers. The insulation properties of 12 layers of paper are not surprisingly better than the carton box alone, but slightly worse than the multifoil.Heat is retained in a 50mm thick celotex box much better than a similar box wrapped in the multifoil material.
As a consequence of this experiment I would not recommend using the foil for insulating a house or barn when heat retention is the primary objective.