Is Drip edge required by code?

Yes, per IRC section R905.2.8.5 drip edge is required for asphalt shingle installations. Drip edge must be installed in accordance with the manufacturers’ installation instructions.

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1. If my roof has an existing lumber sheathing deck (1x6, 1x8, etc.), do I have to re-deck my roof with OSB or plywood when replacing the asphalt/composition roofing?
2. If my shingle manufacturer does not allow my existing (1x8, 1x10 etc.) deck to be used as a base for their product, do I have to remove the old decking or can new OSB or plywood sheathing be installed
3. Is Drip edge required by code?
4. My roofing contractor told me I need to add a cricket to my existing fireplace chimney. Is this correct?
5. If a permit or inspection are not required, do I still have to meet code?
6. Is an ice and water shield required?
7. Is valley flashing/lining required?