This morning was a generous helping of Fun With Cement. One of the rooms in my house that's stripped back to the studs and exposed brickwork has lots of gaps between the concrete blocks. The outer surface is mostly OK, with a few air gaps (that are on the list to fix, when the weather is nicer), but the inner surface has gaps anything up to 3" wide between the blocks. No idea why they did that, but starting the process of filling the gaps in to improve the insulation. It's remarkable how fast it goes through cement, I've used a 10lb bag of it just patching the wall in the last couple of weeks alone. Today I opened my last bag of it, so probably going to be buying more next time I'm in town. Some of the gaps are large enough I'm planning to cut up a concrete block and cement strips of concrete into place. That seems much less involved than trying to patch a 3x8" hole with cement alone. The ones I can't get at (there are some large gaps behind studs) are most likely going to get filled with a combination of fiberglass and builder's foam. Hopefully this will provide an air barrier that will improve insulation immediately, and also offer more protection when my insulation boards arrive at the end of the week. Good news so far - based on the last oil delivery our oil usage is approximately 30% below the oil company's projections based on historical usage.