Not wood related but I had my son help me blow in 38 bags of insulation in the attic above the upstairs bedrooms and over the kitchen and family room. I hadn't been in the attic for many years but I was surprised when I went up and found how much the insulation had settled, there was less than 6 inches. While I had the machine I topped off the other areas to get them close to r60. Hopefully the upstairs will be a little warmer this winter.