Storm and Wind Load Door Inspection

Purpose

The garage door is the largest opening in most houses and the one a storm attacks first. When it fails inward, the house pressurizes and the roof is the next thing to go, which is why wind provisions treat the door as a structural element and not as a piece of trim.

This standard covers two visits: the pre-season check that establishes whether a door is rated and whether the parts its rating depends on are present, and the post-event inspection that decides whether a beaten door is still what its label says. The outcome it guarantees is that nobody hands back a door as storm-rated on the strength of a sticker, and nobody condemns a door that only needs its track cleared.

Scope

Covers residential and light commercial sectional doors: identifying the wind rating, verifying the rating's dependencies, pre-season customer briefing, and the post-event inspection and disposition.

Does not cover selecting or quoting a replacement wind-rated door, which is a measure visit under the door measurement and quote SOP. Does not cover rolling steel curtains or fire doors. Does not cover counterbalance repair, section replacement or re-railing, all of which have their own SOPs and are routed to from step 8.

Every code figure here is gated on adoption: design wind pressures come from the building code and the referenced load standard in the edition your jurisdiction has adopted, and impact requirements apply only where that jurisdiction has designated a windborne debris region. Name the document and pull it; do not quote a pressure from memory or from another county.

Roles and responsibilities

Procedure

1. Read the wind load label and record exactly what it says. Find the label, usually on the inside of an end stile or the back of a section, and photograph it. Acceptance: a legible label recording the manufacturer, model, the design pressures in both directions, and the standard it was tested to (ANSI/DASMA 108 structural, 115 cyclic pressure and impact) or the product approval number. Wrong looks like a label painted over, or a technician writing "wind rated" with no numbers. Stop rule: no legible label means the door is treated as unrated and recorded as unverifiable, not as rated because it looks heavy. Hazard: none at this step; it is a photograph taken beside a closed door.

2. Verify the parts the rating depends on are present and correct. A rating belongs to an assembly, so check the jamb anchor pattern, the track bracket count and spacing, any struts specified, and whether the approval calls for a removable center post or a bracing kit. Acceptance: anchor and bracket counts matching the manufacturer's installation instruction for that approval, and any required post or bracing present on site. Wrong looks like a rated door hung on the anchor pattern the installer used on the last standard door. Stop rule: a missing dependency means the door does not carry its rating, and that is written to the customer plainly, because the difference is invisible until the day it matters. Hazard: probing anchors overhead sends grit down, so eye protection is worn, and a jamb anchor is never removed to check its length on a door still in service.

3. Brief the customer on what actually helps and what does not. Cover three things: the door's rating status as you found it, that the manual release must be usable during a power outage, and that any bracing kit is fitted before the weather arrives, not during it. Acceptance: the customer has repeated back the rating status and demonstrated the manual release with the door fully closed. Wrong looks like a customer who plans to park a truck against the door, which does nothing against uplift and pressure and puts a vehicle inside the failure path. Stop rule: a customer who cannot operate the manual release gets it in writing on the invoice with a second household member named. Hazard: the release is demonstrated with the door fully closed and never part open, because pulling it on a raised door with a weak counterbalance drops the door instantly.

4. On a post-event call, clear the approach before you touch the building. Look for downed or sagging conductors, standing water inside the garage, and a service mast pulled off the wall. Acceptance: no conductor within reach of the work area, no standing water in contact with an energized receptacle or the operator, service entry intact. Wrong looks like wading in to unplug the opener. Stop rule: a downed line or water at an energized receptacle stops the visit at the driveway; nobody enters, the utility is called, the customer stays out. Hazard: water plus electricity kills before anything else on this call, so where the operator or its receptacle has been wetted a qualified person switches the branch circuit off at the panel before anyone works in the bay, per 29 CFR 1910.333(b)(2); if nobody on site is qualified, the work waits for an electrician.

5. Inspect the door from outside, then inside, without cycling it. Walk the outside face for impact marks and separation at the jambs, then the inside for hinge, bracket and strut damage and for daylight at the perimeter. Acceptance: a written list of what is damaged and where, plus confirmation the door is still fully engaged in both vertical tracks. Wrong looks like pressing the wall button to see if it still runs. Stop rule: the door is not operated under power until steps 5 through 7 are complete, because a door with a pulled anchor or a debris-jammed track tears itself further on one cycle. Hazard: storm debris includes broken glass and exposed fasteners, so gloves and eye protection go on before you walk the inside face.

6. Measure permanent deflection against a string line. Pull a line taut across the outside face at mid-height and measure the gap at each section. Acceptance: no more than 1/8 in of permanent bow at any section, which is a shop default worth committing to and tuning to your own door mix rather than a published limit. Wrong looks like a door that reads flat at the ends and stands 3/4 in proud in the middle, which is permanent set from pressure rather than a dent from an impact. Stop rule: any door exceeding the band loses its rated status until the manufacturer says otherwise in writing; it does not get straightened and re-labeled by the shop, and the customer is told the door will still operate but is no longer proven to its label. Hazard: none at this step; the door is closed and the work is a string line and a rule.

7. Check jamb anchors, track brackets and the counterbalance for pull-out and shift. Try each jamb bracket by hand, look for elongated anchor holes and fresh splits in the jamb, and check both cables and springs. Acceptance: no bracket that moves under hand pressure, no elongated anchor hole, both cables seated and taut, springs continuous. Wrong looks like a bracket that rocks a little and a hole that is now oval rather than round. Stop rule: an elongated anchor hole is a replacement anchor in fresh material, never the same fastener re-driven, and a moving bracket means the door does not go back into service until it is re-anchored. Hazard: the bottom bracket carries full cable tension even on a closed door, so it is inspected by sight and never loosened, and any spring or cable finding routes out of this procedure rather than being corrected here.

8. Put the door back into service deliberately, and prove the protections still work. Clear debris from both tracks, restore power at the panel, plug the operator back in, cycle once by hand, then once under power, then run both entrapment tests. Acceptance: full manual travel with even effort, and under power the door reverses on beam interrupt and reverses to full open on a 1.5 in 2x4 laid flat, re-tested on a 1 in object per 16 CFR Part 1211 if it only just reverses. Wrong looks like an operator that runs but whose photo eyes debris has knocked out of alignment. Stop rule: any failed check leaves the door disengaged with the customer told not to use it, and an opening that cannot be secured is escalated to the office the same day. Hazard: this step puts power and motion back after a flood or an impact, so the bay is clear of people first, and a wetted operator is not energized until an electrician has cleared the circuit and the head is assessed dry.

The record this produces

• Label transcription and photograph from step 1: manufacturer, model, both design pressures, approval or standard number.
• Dependency check from step 2: anchor pattern, bracket count and spacing, struts, post or bracing kit, each as found against the instruction.
• Customer briefing confirmation from step 3, including who demonstrated the manual release.
• Approach findings from step 4 on a post-event call, including any utility call placed.
• Damage list from step 5 and the deflection readings from step 6, section by section, against the 1/8 in band.
• Anchor and bracket findings from step 7, and the disposition of each.
• Restoration results from step 8: manual cycle, powered cycle, both entrapment tests with the object size used.

The deflection readings are the ones that matter years later. A door with a pre-season record of zero bow and a post-event record of 1/2 in has a documented event; a door with no baseline has an argument. The label photograph is what lets the office ask the manufacturer a specific question.

Worked pass: pre-season check on a 16 ft by 7 ft rated double, one dependency missing

A coastal-county customer books a pre-season check on a door installed by another company four years earlier.

Step 1 found a legible label on the inside of the right end stile naming the manufacturer, model, both design pressures and a product approval number, and it was photographed.

Step 2 failed. The approval's installation instruction for that model calls for jamb anchors at a stated spacing plus three horizontal struts on a 16 ft door. The jamb bracket pattern matched. The strut count did not: two fitted where the instruction calls for three, so step 2's stop rule was taken. The finding written to the customer was not "the door is unsafe" but the accurate one: approved as an assembly with three struts, two fitted, so until the third goes in to the manufacturer's instruction the door does not carry the pressures on its own label.

Step 3 covered the rating status, and the customer demonstrated the manual release with the door fully closed and re-engaged it.

Step 6 was run anyway as a baseline, because a deflection reading is only worth having if it exists before the event. The string line read 0 in at both ends and no more than 1/16 in at any section, inside the 1/8 in band. Step 7 found every bracket solid and no elongated holes. Step 8 restored and both entrapment tests passed on the 1.5 in 2x4 without needing the 1 in re-test.

The third strut was ordered to the manufacturer's part number for that model and fitted the following week, after which step 2 was re-run and passed.

References

• The building code and referenced load standard in the edition your jurisdiction has adopted, which set design wind pressures and designate windborne debris regions. The door's own product approval names the pressures it was tested to.
• ANSI/DASMA 108 for structural performance testing of garage doors, and ANSI/DASMA 115 for cyclic wind pressure and impact testing, each in the edition referenced by the approval your door carries.
• Door manufacturer's installation instruction for the specific approval: anchor pattern, bracket spacing, strut count and any bracing or post requirement. This governs step 2.
• 16 CFR Part 1211 for the entrapment protection tests in step 8, and 29 CFR 1910.333(b)(2) for the electrical work practices in steps 4 and 8.
• See related: the door measurement and quote site visit SOP, and the door balance test standard for the counterbalance checks routed out of step 7.