‘strnum’ can be used to convert data of type ‘char’ to ‘double’
So in your case you can apply this function to each element of the cell using ‘cellfun’
The following line converts your data from char to double
cellfun(@str2num, roofM.materials.volumetricHeatCapacity);
For more information on ‘cellfun’ and ‘strnum’ refer to the following links
Hope this helps!
