Don't know for sure, but I've never heard of a max limit.
You do need airflow in your attic space though - cut that and you risk mold and rot. So that's a limiting factor of sorts right there.
But I think there's the rule of diminishing returns at play with insulation.
r120 would be twice as good as r60 but the difference would probably only save you about 15 cents a year in energy costs.
Keep in mind too that - depending on the materials used - if you stack insulation too high, it's going to start crushing the airspace out of the material at the bottom - lowering the rvalue.
In other words if you lay a strip of r 20 fiberglass insulation on top of another - it doesn't give you r40. It'll certainly be BETTER than r20 - but it may not be as good as you think because the lower layer is squeezed more than it should be.
And on top of that, as somebody else mentioned, the weight between joists directly on your ceilings is a serious concern. Put too much insulation and over time you could get some bowing and cracking in your ceilings.
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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