Metal roofs, walls and rainscreens: methods and worked application

Eleven numbered steps in a column joined by arrows: record the code edition and AHJ; classify; check slope against both minimums; match the listed rating to demand; name the test route; decide on water and air tests; walls cavity type; material and thickness; width and length; oil-canning clause; review the submittal. Steps three, four and seven have an amber edge marking a decision.

1

Record the governing code edition and any local amendments, and who the authority having jurisdiction is

10

Write the oil-canning clause: profile, material, flat widths, substrate tolerance and acceptance basis

11

Review the submittal: every rating document names the exact installed assembly

2

Classify the roof or wall: span, water strategy, attachment

3

Check the slope against the code floor and the maker's minimum; the stricter governs (decision)

4

Match a listed rating for the same assembly to the engineer of record's uplift in every zone (decision)

5

Name the test route the code allows for the panel type, and any FM class the project specifies

6

Decide whether water and air test evidence is required for the roof

7

Walls: choose barrier, drained or pressure-equalized; record the barrier, cavity depth and any MCM fire evidence (decision)

8

Check material and thickness against the code tables, and fastener metals

9

Choose panel coverage width, count and length, including any on-site roll forming