Wheelbarrow01:

 

It was extremely high-tech. The guy started at the corner of the house, drilled the first hole (into the mortar between bricks), then used a piece of wire to probe and thus determine where the next stud and dwang is . Rinse and repeat. At the end of the process, he checked his work with the infrared temperature gun, filled the holes with mortar, then painted over the mortar (my whole house is painted white). You need a pretty expert eye to see any evidence of installation.

 

The temperature gun was very interesting to play with. I had it trained on the gib inside the house as he was filling the cavities up. I could actually see the gib gradually change colour as he filled the wall. Over the course of 10-15 minutes or so, the heat signature of the gib would go from a dark purple to a more red/orange colour. The voids started out darker than the timber framing, and at the end, the framing was far darker than the insulated voids.

 

I had that stuff put into my weatherboard house. They just drilled holes at regular intervals and pumped it in. Given the irregular framing there are gaps we found when we took some wall linings off. They filled the holes badly, and the cedar weatherboards leaked oil for months. Even once sanded, sealed and painted it doesn't look right, but will probably be ok after a full paint.

I'm not sure how much difference the wall insulation made to the weatherboard house. At the time I said not much. It must help at least a bit though. Maybe it helps more with brick houses. Ceiling made a huge difference, underfloor no real heat difference but reduced moisture and improved smell. Double glazing increased noise (oddly) but made things a little more comfortable.