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Structural attachments and substrate assessment · Lesson 3 of 4

Structural attachments and substrate assessment: methods and worked application

A designer workflow for roof-edge attachment, two worked calculations with every input sourced, how the nailer and edge are installed and anchored, and how to read an existing nailer and a submittal.

You will be able to: Follow a documented seven-step workflow from a tested edge system to an anchored nailer, turn a published pressure into a force per foot, work out anchor demand from the ED-1 floor, and review a submittal against the tested assembly.

13 min · 11 slides · 9 questions

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Slide 1 of 11

A seven-step workflow

The seven steps: take the wind demand from the engineer of record; choose a tested system and get its report; specify the nailer; have the engineer design the anchorage; match fastener metals; plan the re-roof inspection; review the submittal against the tested assembly.

Where documents do not name the tested substrate, ask the manufacturer for the test report; do not assume it.

Seven steps from demand to submittalA vertical flow of seven numbered steps: take the wind demand from the engineer; pick a tested system and get its test report; specify the nailer and its treatment; the engineer designs the anchorage; match fastener metals to wood and cover; plan the re-roof inspection; review the submittal against the test. A signal-red side note at step 2: if the substrate is not named in the documents, ask for the report and do not assume. A teal side note at step 6: for a re-roof, expose the wood, inspect it and replace it if bad.Seven steps from demand to submittal1Take the wind demandfrom the engineer2Pick a tested system;get its test report3Specify the nailerand its treatment4Engineer designs theanchorage5Match fastener metalsto wood and cover6Plan the re-roofinspection7Review the submittalagainst the testSubstrate notnamed? Ask forthe report; donot assume.Re-roof only:expose the woodand inspect it;replace if bad.A teaching sequence, not an AFS procedure.

A vertical flow of seven numbered steps with two side notes: if the substrate is not named in the documents, ask for the report and do not assume; for a re-roof, expose the wood, inspect it and replace it if bad.

1
Take the wind demand from the engineer of record
2
Pick a tested system and get its test report, recording the tested substrate
3
Specify the nailer: species or grade, thickness, width, treatment and moisture condition
4
The engineer of record designs the anchorage for the substrate
5
Match fastener metals to the treated wood and the cover metal, and isolate dissimilar metals
6
Plan the inspection of existing nailers for a re-roof
7
Review the submittal against the tested assembly
A teaching sequence built from ES-1, ED-1 and manufacturer documents; it is not an AFS procedure.

Sources

Glossary

Engineer of record
The engineer ED-1 names as responsible for designing the nailer for bending, shear, other stresses and fastener pull-through.
Sustained pressure
Drexel Metals' term for its published ES-1 test value in pounds per square foot; Drexel states that the design engineer must apply the factor of safety.
Face height
The height of the vertical face of an edge system, the H in ES-1's result R = F / (H x L).
Demand per anchor
The vertical load a single nailer anchor must carry: the load per foot of edge times the anchor spacing in feet.
Cleat
The metal strip fastened to the nailer that the edge cover engages; in Drexel systems it is pre-punched and fastened with Drexel-provided fasteners.