Once the underlayment is complete and the roof flashings are installed, the roofer will call for the dry-in inspection. Whether the inspector is combining this inspection with the previous inspection or doing them separately, he will want to be satisfied with what he sees in materials and completed flashing details. A quick walk around will provide him with an opportunity to observe this condition.
It is very typical for the previous two inspections and this inspection to be called in at the same time. Some localities don't have one or two of these inspections and prefer to group them all together. So you see, a lot of work has already been accomplished by the time the inspector first sets foot on your property. Supervision over damage control, regulatory and code compliance is paramount during the first few phases of your roofing project. Public inspectors will not be able to provide this with certainty.
The second requirement that gets checked off on the roofing compliance affidavit by your roofer is for your secondary water barrier. Typically, this is satisfied by the use of a self-adhering, self-sealing underlayment material. This material goes a long way to assure that your roof is dried-in. The main purpose for the secondary water barrier is that it helps to assure that if you lose part of your roof in a severe storm, the damage to the inside of your home will be minimal.