What is my next step to take? Two layers of regular insulation topped off with blow in insulation, and I still get icicles?

I assume you are having icicles forming along your roofline so I'll try to give you some information that may be of help. With as much insulation as you say you have already installed in your attic space I would think you should have a very good R-value ( R-value is a measure of thermal resistance) unless there are areas that have not gotten good coverage with the insulation. You have to keep in mind that even with a very well insulated roof, you will most likely still experience some melt on the exterior caused by solar radiation.

Even if the outside temperature is extremely low, if the sun is shinning it is going to cause some snow and ice melt on your roof and as that melt water travels down and over your drip lines it will often time refreeze into icicles due to the ambient air temperature and lack of solar penetration to that area. If you suspect that you have heat loss which is causing the melting a good visual inspection from outside the house can often show you where the trouble spots are. Look at your roof a day or so after a snowfall and see if the snow is covering your roof somewhat uniformly.

If you see area where it looks like the snow has melted away and the roof itself is visable then you might have a trouble spot where you have a heat leak. Now doing just a visual inspection can be misleading due to various conditions such as wind, which often time will blow the snow and create irregular coverage, sometimes the weight of the snow itself will cause it to slid off the roof which would clear an area and could be mistaken as a trouble spot. The various pitchs of roof will often play a factor in how much snow will accumulate on the roof.

If you suspect that you are losing heating and cooling through your ceiling, walls, floors, windows, and doors what you may want to do, and something I would reccomend, is to contact a thermal imaging inspector, also know as a "thermographer". I had this done a couple of years ago to my house for the same reason, I knew the insulation was well above code because I did it myself and have alot of building experience. I was getting ice buildup along some of my eaves and had ruled out natural pasive solar melt, but could not isolate where I was losing energy.

I hired a thermal imaging inspector that I found through my county zoning commissioner, it cost me right at $400 to have the house imaged inside and out. The images clearly indicated some trouble spots that I would of never been able to find without tearing my walls apart. In my case it was a family of squirrels that had set up shop along some of my eaves and decided to rearange my insulation to their personal specifications.

I was able to access my trouble spots directly and for a few hundred dollars correct the situation. So for less then $1,000 I was able to stop the energy loss and permanatly block the entry points of the squirrels. I'm sure from comparring my bills that the cost was made up in less then one year of heating and cooling.To locate a thermal imaging inspector you can try contacting your energy provider or often time your insurance agent will have contact info for one.

Home appraisal companies are another source, or you could just check your local listings. Personally I like to get a reccomendation from someone I trust or at least someone with good references. More information dealing with Thermographic Inspections can be seen via the links I've provided in my sources.

This might be a solution to your concerns. I hope this helps. youtube.com/watch?v=jXPXE0qsmjg.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.