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Gun or hand nail is about the same (no staples). The wire "burrs" on coil nails can interfere with the ice & water shield's seal around the fastener shaft...very rare. I have only seen this in ski areas with tremendous snow loads and ice dams. Not a problem in NC.
OC Oakridge 30's are architectural shingles.
Architectural shingles are NOT $20-32/sq more than 3-tabs. The $8-15/sq upgrade to architectural shingles is worth it....you will get this all back when you sell.
the cricket is OK w/APP Torched. 2 layers of Grace Ice & Water Shield and shingles will work for your cricket in North Carolina.
I use 30# and Grace.
Jim
 

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Yes, it is below the slope minimum. It's just a cricket. Unless your local code officials make you use the torch down, the 2 ply GIWS w/shingles will work fine. At the worst, the granules in this area might not last the full term of the warranty. At best, the use of torch down on a cricket can cause flashing detail problems. For example, how will the torch down flash down onto the shingles below? You can't torch down onto the shingles. Technically, the torch down mfr will require metal flashing at this location. You can always build the cricket up a little bit.
Jim
 
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