The loft insulation in my house is old and thin between-joist fibre-glass. However, I did put boards over most of it so that the space could be used as a store. I need to work out U values for various possibilities.
2010/04/06. I thought that I would make a start by logging the temperatures in the loft and in a room below and I have some temperature loggers from Signatrol that I hope to set up for a few weeks to collect temperatures. I will also regularly check the room ceiling temperature with an IR thermometer that I got from Maplin.
I am investigating using reflective insulation, though I read that the manufacturers have exaggerated the effectiveness of the products. I will try to make some theoretical estimates of effectiveness before deciding how to go.