Drywall pricing lives and dies on one document: the wall type schedule. Stud size, gauge, spacing, height, layer count, rating, finish level: it's all there, and a careful read gets you most of the way to a real number. What doesn't live there is the boundary work, and it doesn't cost the same amount to miss each piece of it. Here's the list in the order it bites.
What's on the wall type schedule
- Steel stud framing and furring, interior non-structural framing: stud size, gauge, spacing, heights, deflection heads, king studs, rough openings.
- Gypsum board supply and installation, type, thickness and layer count per assembly: standard, Type X fire-rated, moisture/mould-resistant, abuse-resistant, shaftliner.
- Taping and finishing to the specified level: GA-214-style levels per room or surface. Level 4 versus Level 5 is a real price difference, and the finish schedule decides it, not the wall type schedule.
- Fire-rated and acoustic assemblies: rated partitions and shaftwall with their tested-assembly requirements, plus the acoustic insulation, sealant and resilient channel each calls for.
Six things ranked by how often they turn into a change order
1. Level 5 and the lighting clause nobody expects. A skim-coat requirement tied to gloss paint, wall-wash lighting, or a "critical light" condition is routinely stated in the painting section or buried in lighting general notes, not Division 09 21, where you'd naturally look. Miss it and you've bid Level 4 against a wall that will visibly telegraph every joint once the fixtures go in. The single most common finish-level dispute on a tender, and it hides in the section you weren't planning to read.
2. Backing and blocking, the classic unpriced item. Plywood or steel backing for casework, handrails, grab bars and TV mounts is drywall scope when it's shown on the wall types. The trap is when it's only mentioned in someone else's section (millwork calling for backing "by others," say) with no matching line on the wall type schedule. Real material and labour with no obvious home, and exactly the kind of thing discovered at rough-in instead of at bid.
3. Firestopping, yours or a specialty sub's. Firestopping at penetrations through rated assemblies sometimes ships inside the drywall package, sometimes goes to a dedicated specialty sub. Section 07 84 00 has the requirements; what it usually doesn't have is a clear statement of who installs on this tender. Confirm the assignment before pricing rather than defaulting to either answer.
4. Deflection and slab-movement details. Deflection track, slip connections and head-of-wall fire joints are typically specified once, in a single typical detail, and that one detail carries labour and accessory cost across every wall it applies to. Missing it once means missing it on every wall in the set.
5. Ceiling heights and bulkhead complexity. The reflected ceiling plan carries scope the floor plans never show: bulkheads, soffits, ceiling transitions. A separate drawing set from the one most estimators read first.
6. Temporary heat and humidity for finishing. Taping and finishing need conditioned air. Whether the site provides temporary heat, and who pays, is a Division 01 clause with real winter-schedule cost attached, and it's easy to assume that's someone else's problem until the schedule confirms otherwise.
Two smaller ones round it out. Access panels are usually supplied by the mechanical or electrical trade needing the access and installed by drywall: standard practice, but confirm supply is genuinely on the other trade rather than silently assumed by both sides to be the other's problem. And in-wall insulation shown on the wall type schedule is drywall scope, but thermal insulation in exterior assemblies may or may not be; the tender needs to say which.
What isn't yours
- Structural framing and engineering: a different trade's scope entirely; drywall's framing is non-structural interior partitions.
- Painting and decorating: your obligation ends at the specified level. The exception is exactly the Level 5/lighting dispute above, which is why it tops the list rather than sitting as a footnote.
- Substrate and water-damage correction: someone else's substrate, or pre-existing damage found mid-job, is extra work unless the documents say otherwise.
Who you're sharing the wall with
| Trade | What to reconcile before you price |
|---|---|
| Mechanical & electrical | Walls close only after in-wall rough-in inspection: confirm the sequence, and who cuts and patches for services installed late. |
| Painting | Finish-level acceptance is the classic boundary dispute: a surface flaw found under primer lands back on the finisher. Confirm the acceptance criteria and the lighting condition it's judged under. |
| Doors & glazing | Who sets hollow metal frames in stud walls, plus opening sizes and glazing pocket framing. |
| Firestopping specialty | Where firestopping is a separate sub, confirm penetration sealing at rated assemblies has an owner per detail, not a general assumption. |
Read the wall type schedule completely; revisions hide in addenda and general notes as often as anywhere else. Then read the painting and lighting sections specifically for finish-level and critical-light language before assuming Level 4 is safe. The wall type schedule is the bid; the six items above are what turn a correct read of it into a bid that doesn't get disputed six months into the job.