Many shingle manufacturers do not require drip edges at the eaves - Certainteed's Shingle Applicators Manual for example requires shingles to overhang rakes and eaves to a certain extent if you use a drip edge, and a different extent if you do not, so it appears both are acceptable to the manufacturer.
You will get some disagreement between various AJHs over whether IRC 903.2.2 requires a drip edge at the rakes, eaves or both - based on what I've read on the various home inspection and roofing boards it appears that communities in cold climates are most likely to require eave and rake flashings.
Assuming that neither your shingle manufacturer nor local AHJ requires them, your installation may meet the all manufacturer's and local code requirements - but IMO such an installation does not meet the standard of "industry best practice".
By that standard, IMO whether there is to be a gutter or not there should have been a drip edge. And if water proof underlayment (ex: Ice and Water Shield) was installed, it should have gone over the drip edge.
Home Inspections, Infrared (Thermal Imaging) Leak Identification and Inspection Services, Roof, Attic, Building, Basement and Foundation Moisture Intrusion and Water Leak Inspections, Troubled Building Consultations - Serving Chicago and Suburbs
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Last edited by Michael Thomas; 11-24-2010 at 06:38 PM.