Free checklist
Gypsum concrete underlaymentGypsum concrete underlayment final inspection checklist
Gypsum concrete underlayment final inspection is where the punch list is either short or expensive. This checklist walks the finished work the way an owner or AHJ will see it: devices on, systems running, everything labeled. Each item gets the photo that closes it instead of reopening it. Work is commonly verified against manufacturer's published instructions. Confirm the edition your authority having jurisdiction has adopted.
- Items
- 4
- Photos required
- 7
- Built for
- Subcontractors
Who runs it
The GC's superintendent with the underlayment crew lead, before the flooring contractor takes the floor.
When in the schedule
After the pour has set and dried and before floor goods are installed, since moisture and soft spots trapped under finish flooring cause callbacks.
The checklist
Every item, and the photo that proves it
The photo count on each row is what RTI would require before the item can be submitted. Copy the list as is, or load it into RTI and let the gate enforce it.
Thickness and hardness
- 2 photos
Thickness and coverage verified across the floor
Depth checked at edges, penetrations and mid-span, meeting the specified minimum over the high point, full coverage with no exposed mat or deck.
- 2 photos
Surface hard and sound, not dusting
Surface scraped or scratch-tested for hardness, no soft or powdery areas, no drummy or hollow spots when sounded.
Moisture
- 2 photos
Cured to the flooring manufacturer's moisture requirement
Moisture tested by the method the flooring manufacturer requires, results meeting their limit and documented before floor goods are released.
Cracking
- 1 photo
Floor checked for shrinkage and reflective cracks
Surface walked for cracks, especially at deck joints and thin sections, cracks assessed before they're bridged by finish flooring.
What usually sends this back
The failures are almost always the evidence, not the work
- Flooring installed before the gypsum dried to the flooring manufacturer's moisture requirement, so the finish floor buckles or debonds.
- Surface left soft or dusting because the pour dried too fast or was walked too early, and the primer for floor goods won't hold.
- Thin areas over a high spot in the deck never caught, so the underlayment cracks under load right there.
Run it with the Photo Gate
A checklist nobody can submit half-finished
Load this list into RTI, stick a QR tag on the area it covers, and the submit button stays locked until every mandatory item is answered and the 7 required photos exist. Approved walks roll into a branded turnover package with a tamper-evident record behind every line.
Submission state
The gate is enforced on the server, so it holds even if the phone is offline when the walk happens.
Common questions
- What does this gypsum concrete underlayment final checklist cover?
- 4 items across 3 sections, covering thickness and hardness, moisture, cracking. Each item spells out what the person walking the job is actually looking for, not just a box to tick.
- Who should run this inspection?
- The GC's superintendent with the underlayment crew lead, before the flooring contractor takes the floor.
- When in the schedule should this walk happen?
- After the pour has set and dried and before floor goods are installed, since moisture and soft spots trapped under finish flooring cause callbacks.
- Why does every item ask for a photo?
- 7 of the 4 items call for photo evidence. A checklist answer without the photo is a claim; the photo is what makes the record worth something in a dispute and lets a reviewer approve work without re-walking the job.
- What most often fails a gypsum concrete underlayment final inspection?
- Flooring installed before the gypsum dried to the flooring manufacturer's moisture requirement, so the finish floor buckles or debonds. Surface left soft or dusting because the pour dried too fast or was walked too early, and the primer for floor goods won't hold. Thin areas over a high spot in the deck never caught, so the underlayment cracks under load right there.
- Can I use this checklist in RTI?
- Yes. Start a free RTI workspace, build this list as a checklist, and the Photo Gate holds the submit button until every mandatory item is answered and its photos are attached. Approved inspections roll into a branded turnover package with a tamper-evident audit trail.
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