We use dry cut core bits for cutting composites. I don't know if anyone around your area carries these, but you can call "B and K Tools" in Asheville and tell them what you're after, they have a good size selection.
These bits can be used with 1/2" drill motors or side grinders with the appropriate adapters.
Would asbestos shingles be another form of this or acually what he is refering to? They are very thin maybe 1/4-3/8 inch. These were big in my area it seems and alot of times I find them under new siding. I use a roto zip and a resperator and a tile bit
Yes, they used to be called asbestos shingles and still are by some. They were the vinyl siding of the 40's and 50's. These were 1/8" thick and in the 60's 1/4" thick ones were introduced. I don't believe any of the 1/4" thick ones ever contained any asbestos though for many years the 1/8" ones did. Both styles are still available today for replacement use though obviously none contain asbestos.
The 1/4" ones were really not bad and will last forever with little maintenance. James Hardie and others made the 1/4" thick style available in long lengths rather than individual shingles. Same thing, new twist. I think this was introduced and became popular on the west coast because of their fire resistant properties and is now becoming popular throughout the US as a vinyl upgrade.
This is not the old asbestos siding,but is the cement board,Hardi-plank,or Hardi board,as Hal said.
It's becoming very popular on new homes and some commercial bldgs. here. I can be had with a "wood grain" look,and is hard to tell from wood until you drill it. I just haven't found a good way of dealing with it yet.
Thanks for the heads up Roger.And yes all is well.
Hardy plank is becoming more popular around here. I have found the carbide tipped hole saws drilled at slow speed work well and one saw lasted thru a 150 unit apartment complex and still have it.( avg of 4 holes/apt.) One of my JE tried to drill as fast as possible and went thru a hole saw a day till I made him slow the drill down when drilling. Good luck