Saturday, 5 January 2013
Day 4: A House Needs Electricity
The yellow piles in the background were delivered today, too, with some delay due to the delivery person falling ill last week. They are FinnFoam sheets, which will be spread on the ground to prevent the ground from freezing under the house in winter. FinnFoam is a lot smarter than polystyrene in that it is non-compressible, and completely sealed: water can enter only the pores directly destroyed by cutting the sheets, i.e. the top couple of millimetres. Even if submerged for a year, FinnFoam stays dry on the inside, and thus retains its insulating capabilities.
Why does the ground need to be prevented from freezing? The problem is that water, when freezing, actually expands, and thus a process of freezing and melting under the house can lead to shifting of material under the house, and the house can end up at a strange tilt – though I doubt frost had anything to do with the tilt of the famous tower in Pisa... :-)