Understand why nail placement and depth matter, what the fastening zone means, and which details a roof inspection should explain.
Nailing is mostly hidden after the next shingle course is installed. A finished roof can look straight without showing how it was attached. Ask for installation-stage evidence when reviewing workmanship.
Understand the detail
The July 2026 Duration instructions place standard fasteners in the designated SureNail area. Nails must be properly driven and meet the specified penetration. Steep-slope requirements differ. Nail count alone does not demonstrate correct fastening.
Compare the nail heads: a flush head holds the layers without cutting through them or standing proud. Nail count and placement still depend on the exact shingle and installation requirements. Source: FEMA via DOE Building America. View original detail.
At a glance
| Checkpoint | Question for the roofer |
|---|---|
| Placement | Does the location match this shingle’s instructions? |
| Depth | Are heads seated correctly without cutting the shingle? |
| Holding | Is the deck suitable for the specified attachment? |
| Roof conditions | Are special slope or application rules involved? |
Three steps for a clearer roof inspection
Identify the exact shingle. Similar-looking products can have different details.
Ask for a clear sample photo. It should show the fastening area before the next course covers it.
Discuss any repair findings. Ask which shingles are affected and how the proposed correction addresses the cause.
Can I inspect the nails from the ground?
Generally not. Request photographs and an explanation from the roofer. Do not lift sealed shingles to investigate them yourself; document visible concerns and arrange an inspection.
Explore the connected details
Read the related roofing guide
See the roof shown in this guide
The cover is a completed-roof example from our project library. It is not proof of a particular shingle brand or of concealed installation details.
Sources and further learning
Owens Corning: Duration fastening instructions
Owens Corning Contractor Academy: technical training topics
Prepared by Barnes N’ Roofs, serving the Austin and San Antonio metro areas from New Braunfels. Technical review: September 22, 2026. Installation must follow the selected product instructions and applicable local requirements.