Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
---
title: Finish Carpentry
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−# Materials {toc}
+# Trim material shall be selected for the application, and the material choice carries real consequences for moisture tolerance, appearance, and cost.
−## Trim material shall be selected for the application, and the material choice carries real consequences for moisture tolerance, appearance, and cost.
+## There is no single best trim material; each common option trades cost, dimensional stability, paintability, and moisture tolerance differently. The right choice depends on whether the trim is painted or stained, whether it sees moisture, and the project's budget and grade. {note}
−### There is no single best trim material; each common option trades cost, dimensional stability, paintability, and moisture tolerance differently. The right choice depends on whether the trim is painted or stained, whether it sees moisture, and the project's budget and grade. {note}
+## Paint-grade MDF is the workhorse of commercial and multi-family fit-out - dimensionally stable, dead flat, with crisp molded profiles and a factory-primed surface that paints beautifully. Its one disqualifying weakness is moisture: MDF swells irreversibly when wetted and must never be used in wet or periodically damp areas. {note}
−### Paint-grade MDF is the workhorse of commercial and multi-family fit-out - dimensionally stable, dead flat, with crisp molded profiles and a factory-primed surface that paints beautifully. Its one disqualifying weakness is moisture: MDF swells irreversibly when wetted and must never be used in wet or periodically damp areas. {note}
+## Finger-jointed primed pine is the cost-effective solid-wood choice for high-volume painted work; short clear blocks are joined into long lengths, then primed. It is stable and economical but is paint-grade only - the finger joints telegraph through clear and stained finishes. {note}
−### Finger-jointed primed pine is the cost-effective solid-wood choice for high-volume painted work; short clear blocks are joined into long lengths, then primed. It is stable and economical but is paint-grade only - the finger joints telegraph through clear and stained finishes. {note}
+## Clear solid pine and poplar serve standard commercial and institutional painted and stained work; oak and maple serve stain-grade institutional and hospitality work where a visible hardwood grain is wanted. {note}
−### Clear solid pine and poplar serve standard commercial and institutional painted and stained work; oak and maple serve stain-grade institutional and hospitality work where a visible hardwood grain is wanted. {note}
+## Poplar deserves a note of its own among the solids: it is a hardwood by botanical classification and machines and paints cleanly, but its greenish, blotch-prone grain makes it a paint-grade choice in practice. It is the default solid-wood paint-grade trim where finger-jointed stock is not wanted because clear lengths must be visible. {note}
−### Poplar deserves a note of its own among the solids: it is a hardwood by botanical classification and machines and paints cleanly, but its greenish, blotch-prone grain makes it a paint-grade choice in practice. It is the default solid-wood paint-grade trim where finger-jointed stock is not wanted because clear lengths must be visible. {note}
+## Cellular PVC is specified where wood is inappropriate - high-humidity rooms, semi-wet areas, and locations where a wood profile would swell or rot. It is moisture-immune and paintable but moves more with temperature than wood, so joinery and fastening detail differ. {note}
−### Cellular PVC is specified where wood is inappropriate - high-humidity rooms, semi-wet areas, and locations where a wood profile would swell or rot. It is moisture-immune and paintable but moves more with temperature than wood, so joinery and fastening detail differ. {note}
+## Thermally fused laminate and high-pressure-laminate-wrapped MDF profiles serve healthcare and commercial spaces that require a durable, wipe-down surface integral to the trim. {note}
−### Thermally fused laminate and high-pressure-laminate-wrapped MDF profiles serve healthcare and commercial spaces that require a durable, wipe-down surface integral to the trim. {note}
+## Pre-finished stain-grade solid or engineered profiles, finished in the shop before delivery, suit architectural and boutique hospitality work where field finishing is impractical or where a controlled factory finish is wanted; they shift finishing risk to handling and protection rather than to the painting trade. {note}
−### Pre-finished stain-grade solid or engineered profiles, finished in the shop before delivery, suit architectural and boutique hospitality work where field finishing is impractical or where a controlled factory finish is wanted; they shift finishing risk to handling and protection rather than to the painting trade. {note}
+# Wood and composite trim materials shall meet the following grading and material requirements.
−## Wood and composite trim materials shall meet the following grading and material requirements.
+## Solid hardwood trim shall be graded to NHLA rules; FAS grade is the standard for finish carpentry, with No. 1 Common acceptable only where specifically permitted for paint-grade work.
−### Solid hardwood trim shall be graded to NHLA rules; FAS grade is the standard for finish carpentry, with No. 1 Common acceptable only where specifically permitted for paint-grade work.
+## Solid softwood trim shall be graded to PS 20; C-Select or better shall be furnished for clear and stain-grade applications.
−### Solid softwood trim shall be graded to PS 20; C-Select or better shall be furnished for clear and stain-grade applications.
+## MDF and HDF profiles shall be furnished as moisture-resistant grade in any location subject to incidental moisture; standard MDF shall not be used in restrooms, janitor closets, mechanical rooms, or other areas with periodic moisture exposure.
−### MDF and HDF profiles shall be furnished as moisture-resistant grade in any location subject to incidental moisture; standard MDF shall not be used in restrooms, janitor closets, mechanical rooms, or other areas with periodic moisture exposure.
+## Cellular PVC trim shall be furnished in lieu of wood or MDF in high-humidity and semi-wet locations where wood-based trim is not appropriate.
−### Cellular PVC trim shall be furnished in lieu of wood or MDF in high-humidity and semi-wet locations where wood-based trim is not appropriate.
−
```datasheet
label: Trim material - running trim (base, casing, crown)
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```
−### The surface-preparation state is a coordination decision, not just a product attribute: it dictates how the painting trade is sequenced against this work. Pre-primed trim assumes walls are primed before trim is set, then top-coated after; reverse that order and raw overlap edges and caulk lines are left unfinished. {note}
+## The surface-preparation state is a coordination decision, not just a product attribute: it dictates how the painting trade is sequenced against this work. Pre-primed trim assumes walls are primed before trim is set, then top-coated after; reverse that order and raw overlap edges and caulk lines are left unfinished. {note}
−## Hardwood species for stain-grade work shall be specified where a hardwood is selected.
+# Hardwood species for stain-grade work shall be specified where a hardwood is selected.
```datasheet
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### Crown molding is sold in two stock spring angles, 38° and 45°, which set the projection-to-drop ratio and the cope geometry; 45° is the more common choice in commercial work. The spring angle must be coordinated with available ceiling-to-wall clearance and with any cove lighting or soffit above. {note}
+### The base molding height shall be specified, sized to suit the room scale and project grade.
+
```datasheet
label: Base molding height
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```
+### The crown molding spring angle shall be specified, coordinated with the available ceiling-to-wall clearance and any cove lighting or soffit above.
+
```datasheet
label: Crown molding spring angle
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```
+### The running trim elements included in the project scope shall be specified.
+
```datasheet
label: Running trim elements in scope
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```
−### Window stool and apron, where specified, shall be furnished with the stool notched to the rough opening and the apron returned to the casing, sized to the wall and casing thickness. {note}
+### Window stool and apron, where specified, shall be furnished with the stool notched to the rough opening and the apron returned to the casing, sized to the wall and casing thickness.
# Fire Performance {toc}
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type: radio
options:
− - Class C (FSI <= 200, SDI <= 450)
− - Class B (FSI <= 75)
− - Class A (FSI <= 25)
−default: Class C (FSI <= 200, SDI <= 450)
+ - Class C (FSI ≤ 200, SDI ≤ 450)
+ - Class B (FSI ≤ 75)
+ - Class A (FSI ≤ 25)
+default: Class C (FSI ≤ 200, SDI ≤ 450)
```
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## Installed trim shall meet the tolerances of the declared AWI grade; the values below state the Custom-grade defaults.
−### Tolerances are what "good finish carpentry" actually means in measurable terms. The Custom-grade values below are the 80%-case default; declare Economy or Premium and these numbers shift accordingly. {note}
+### Tolerances are what "good finish carpentry" actually means in measurable terms. The Custom-grade values below are the default; declare Economy or Premium and these numbers shift accordingly. {note}
### Running and standing trim shall be installed level and plumb within 1/8 inch in 8 feet (3 mm in 2438 mm).
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## Fastening
−### The fastening method shall suit the substrate, profile width, and required appearance. Pneumatic finish nails are the default for most painted trim; trim screws develop more holding power on dense or hollow substrates; adhesive plus pins or hidden clip systems are used where a fastener-free face is required. {note}
+### The fastening method shall suit the substrate, profile width, and required appearance. Pneumatic finish nails are the default for most painted trim; trim screws develop more holding power on dense or hollow substrates; adhesive plus pins or hidden clip systems are used where a fastener-free face is required.
### Trim shall be fastened into solid framing or backing wherever it occurs; fastening into drywall alone, without backing, is not acceptable for trim that bears load or is subject to impact, such as chair rail and tall base.
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## The Contractor shall warrant the installed finish carpentry against defects in installation.
−### The Contractor shall warrant the installed work against defects in workmanship - including open joints, nail pops, loose trim, and separation at corners attributable to installation - for a period of not less than one year from substantial completion.
−
−### Joint opening, cupping, or movement attributable to the building being placed in service outside the specified temperature and humidity range, after acceptance, is excluded from the installation warranty. {note}
−
```datasheet
label: Installation warranty period
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```
+### The Contractor shall warrant the installed work against defects in workmanship - including open joints, nail pops, loose trim, and separation at corners attributable to installation - for a period of not less than one year from substantial completion.
+
+### Joint opening, cupping, or movement attributable to the building being placed in service outside the specified temperature and humidity range, after acceptance, is excluded from the installation warranty. {note}
+
# Spare Parts {toc}
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default: 20
```