Field Notes
Tapered insulation records before membrane install
A useful roofing packet proves the tapered layout, drain sumps, crickets, saddles, board fit, attachment, cover board, photos, and exceptions before membrane hides the work.
Direct answer
Before membrane is installed over tapered insulation, record the roof area, approved tapered layout, drawing revision, drain and scupper locations, sumps, crickets, saddles, valleys, high points, low points, board sequence, thickness transitions, attachment or adhesive method, cover-board status, photos, open exceptions, and release decision.
A note that says tapered complete is not enough. Once membrane covers the insulation, it becomes much harder to prove whether the installed layout matched the approved taper plan, whether a cricket was turned the right way, whether a sump was built, whether a low spot was left, or whether the board was damaged before cover.
Use this as documentation guidance only. The project drawings, approved tapered layout, roof-system manufacturer instructions, roof consultant, designer, AHJ, owner requirements, warranty terms, and site safety plan control the actual roof work.
Tapered layout disappears fast
Tapered insulation is one of the last chances to see the roof's drainage intent before membrane turns the assembly into one surface. Board labels, slope arrows, thickness breaks, cricket lines, sump cuts, fastener plates, adhesive ribbons, board gaps, damaged corners, wet boards, and cover-board joints can all disappear from view.
That is why the field record should be built before the membrane crew starts covering a section. The record does not need to become a design report. It needs to show which layout was used, which area was checked, what was visible, who accepted it, and what still had to be corrected.
The most useful packet separates three things: the approved design, the field condition, and the release decision. A roof area can match the taper layout but still be held for a damaged board. A drain sump can be built correctly while a nearby cricket is still waiting on a design clarification. Keep those statuses separate.
Start with the approved tapered plan
The first page of the packet should identify the roof area and the exact layout used in the field. Record drawing number, tapered layout sheet, revision, roof zone, gridline, drain number, scupper number, cricket ID, saddle ID, and any manufacturer shop drawing or takeoff used to place the boards.
If the crew is working from a marked-up layout, photograph the markups before the area is covered. If the roof has multiple drain areas, do not let one photo stand for the entire roof. Name the drain area, sump, cricket, or valley that the photo supports.
Also record changes. Field changes happen around curbs, penetrations, equipment rails, sleeper supports, drain bowls, parapets, and existing structure. If a tapered board was cut, reversed, shimmed, substituted, or held because the layout did not fit the field, write that as an exception and get the required approval before cover.
Drainage features need their own evidence
Drains, scuppers, sumps, crickets, saddles, valleys, and high points should be visible in the packet. The record should show that water has a planned path to the drainage points shown in the project documents, but it should not invent design acceptance in the field.
For each drain or scupper area, photograph the sump or low area, the nearby board transitions, the direction of the tapered layout, and any cricket or saddle feeding that point. At curbs, equipment, skylights, hatches, and long obstructions, photograph the cricket direction and the edges where ponding or trapped water would be disputed later.
If the crew sees a conflict, hold the area. Examples include a missing sump, reversed cricket, blocked valley, high point at the drain, board thickness that does not match the layout, existing deck condition that defeats the taper, or a penetration that was not shown on the layout. The record should say who owns the design answer.
Board fit, attachment, and cover board are part of the record
The tapered packet should show more than drainage. It should show whether the boards were dry, sound, fitted, staggered, cut cleanly, and protected before cover. Record damaged corners, crushed boards, large gaps, unsupported edges, loose boards, missing fasteners, adhesive interruptions, and any temporary protection used during weather or staging.
Attachment and adhesive details belong in the packet because they are often hidden quickly. Do not make up a fastening pattern or adhesive rate in the field note. Record the approved method, the area checked, the visible pattern or ribbon status, and the document or person that controls acceptance.
Cover board deserves the same treatment. If cover board is part of the assembly, record board type, area covered, joint condition, fastener or adhesive status, damaged panels, gaps, and whether the cover board changed the visibility of the tapered layout below it.
Minimum pre-membrane packet
Use the project quality form, manufacturer form, consultant report, or roofing contractor inspection form first. Add the field packet where the form does not show the tapered layout clearly enough.
| Record item | Field detail | Why it matters |
|---|---|---|
| Roof area | Building, roof zone, gridline, elevation, drain area, scupper area, phase | Prevents one photo from being applied to the wrong area |
| Approved layout | Drawing, revision, tapered plan, shop drawing, manufacturer takeoff, field markup | Shows what the crew checked against |
| Drainage points | Drains, scuppers, sumps, crickets, saddles, valleys, high points, low points | Preserves drainage intent before cover |
| Board sequence | Board tags, thickness changes, slope arrows, cuts, transitions, substitutions | Shows whether the field layout matches the plan |
| Attachment | Fasteners, plates, adhesive ribbons, securement method, checked area | Captures hidden work without inventing acceptance values |
| Board condition | Dry, damaged, crushed, loose, gapped, contaminated, unsupported, held | Keeps bad boards from disappearing under membrane |
| Cover board | Type, area, joints, fasteners/adhesive, damage, release status | Shows the final substrate before membrane |
| Exceptions | Missing sump, reversed cricket, open design question, wet board, loose panel, blocked valley | Tells the membrane crew what not to cover |
| Release | Released to cover, partial release, hold, recheck required, responsible approver | Protects the decision chain |
Before membrane checklist
Run this check before membrane is staged over a tapered area.
- Confirm the roof area and approved tapered layout revision.
- Mark drains, scuppers, sumps, crickets, saddles, valleys, high points, and low points on photos or drawings.
- Check board sequence, thickness changes, slope direction, cuts, and transitions against the layout.
- Record field changes, substitutions, and layout conflicts before cover.
- Check board condition for wet, crushed, damaged, loose, gapped, contaminated, or unsupported areas.
- Record fastening, plate, adhesive, or securement status only against the approved method.
- Confirm cover-board status where cover board is part of the assembly.
- Photograph drain areas, sump cuts, crickets, saddles, long obstructions, curbs, and penetrations.
- Hold areas with unresolved drainage, attachment, board condition, or design questions.
- Do not release membrane install until required inspection or approval is recorded.
Failed or held areas need a retest chain
If an area is held, keep the hold in the packet. Write the location, reason, photo reference, responsible party, correction, and recheck result. Do not replace the first note with a clean final note.
This matters because the first hold often explains the later dispute. A reversed cricket, missing sump, wet board, open joint, or loose cover board may be corrected before membrane, but the record should still show that the issue was found and closed before cover.
If the correction requires manufacturer, designer, consultant, owner, or AHJ direction, name the controlling answer. The roofing crew should not redesign drainage, attachment, or warranty-sensitive details inside a field note.
Photos that actually help
The best photo set starts with the roof area and then moves closer. Take a wide area photo, layout reference photo, drain or scupper photo, cricket or saddle photo, board-label or thickness-transition photo, attachment or adhesive photo where visible, cover-board photo, and correction photo for any held item.
Anonymous close-ups are weak. A photo of a tapered board edge does not prove the drain area. A photo that shows the drain number, board layout, cricket direction, and gridline gives the reviewer something to use.
Avoid turning the packet into a photo dump. Caption the photos with roof area, drain/scupper, gridline, date, and status so the office can find the right evidence when a question arrives months later.
Weak and strong notes
Weak note: tapered done, ready for membrane.
That note does not show the roof area, layout revision, drain area, sump, cricket, board sequence, attachment method, cover-board status, photos, exceptions, or release authority.
Stronger note: Roof Area 2B checked before membrane over drains D-7 and D-8. Tapered layout T-2 revision 4 used. Board sequence, slope arrows, drain sumps, cricket C-7, saddle S-8, and high-point transition at grid F photographed. Adhesive ribbons visible in checked area per approved method. Cover board installed at Area 2B east half with joints and damaged-board replacement photographed. Hold remains at curb K-12 for layout clarification; membrane released only for Area 2B west half outside the hold line.
The stronger note works because it records both the release and the hold. It keeps membrane crews from covering the area that still needs a decision.
Questions that come up
Can photos replace a roof consultant inspection? No. Photos support the record, but the required inspection and release path comes from the contract documents, owner, consultant, manufacturer, and AHJ.
What if the tapered layout does not fit the field? Hold the area, record the conflict, photograph it, and get the required design or manufacturer answer before cover. Do not force the layout and hide the conflict under membrane.
Does a tapered layout check prove drainage will work? No. It shows the visible field installation against the approved layout before cover. Drainage performance, code compliance, and design acceptance belong to the project requirements and qualified reviewers.
Should cover board be checked separately? Yes, where cover board is part of the assembly. It can hide the tapered board conditions below it and becomes the immediate substrate for membrane.
Compliance and safety limits
This field note is not a roofing design, drainage design, code ruling, warranty approval, fastening pattern, adhesive instruction, structural approval, or manufacturer instruction. The project drawings, approved tapered plan, roof-system manufacturer documents, designer, roof consultant, AHJ, owner standards, and warranty requirements control the work.
Do not use this checklist to bypass fall protection, roof opening protection, hoisting controls, weather limits, hot-work controls, adhesive safety data, PPE, fire watch, material staging rules, or site-specific safety procedures. The record preserves the pre-cover decision chain. It does not authorize unsafe access or unapproved membrane installation.
Sources checked
- ICC Digital Codes, 2024 International Building Code, Chapter 15Used for current model-code context on roof assemblies, drainage, scuppers, drains, and AHJ control.
- Carlisle SynTec, InsulBase Tapered Polyiso Product Data SheetUsed for manufacturer tapered polyiso and roof-system compatibility context.
- Carlisle SynTec, Roofing Systems Design Reference ManualUsed for roof-system document, insulation, cover-board, attachment, and detail context.
- Johns Manville, Insulation Installation InstructionsUsed for board fit, joints, fasteners, plates, adhesive, substrate, and protection themes.
- Holcim Elevate, Tapered Insulation Design SolutionsUsed for tapered systems, drainage, crickets, saddles, sumps, and field coordination context.
- OSHA, 29 CFR 1926.501, Duty to Have Fall ProtectionUsed for roof-work fall-protection safety boundaries.