---
title: Mass Timber
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description: >
When to use: Engineered mass timber structural elements - cross-laminated timber (CLT), structural glued-laminated timber (glulam), nail-laminated timber (NLT), dowel-laminated timber (DLT), and mass plywood panels (MPP) - used as floor, roof, wall, beam, and column members in Type IV-A, IV-B, and IV-C construction.
− Not intended for: Conventional dimension-lumber framing, sheathing, blocking, and trim (see [[syncs/rough-carpentry]]); steel framing members (see [[syncs/structural-steel-framing]]); or steel connection hardware as a primary system (see [[syncs/structural-steel-connections]]).
+ Not intended for: Conventional dimension-lumber framing, sheathing, blocking, and trim (see [[sync/rough-carpentry]]); steel framing members (see [[sync/structural-steel-framing]]); or steel connection hardware as a primary system (see [[sync/structural-steel-connections]]).
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### Steel connectors furnished as part of the mass timber connection system are included in this standard. It does not cover the following, which are specified elsewhere: {note}
−- Conventional sawn dimension lumber, sheathing, furring, and non-structural blocking - see [[syncs/rough-carpentry]]
−- Structural steel framing members - see [[syncs/structural-steel-framing]]
+- Conventional sawn dimension lumber, sheathing, furring, and non-structural blocking - see [[sync/rough-carpentry]]
+- Structural steel framing members - see [[sync/structural-steel-framing]]
### The structural design - member sizing, layup selection, connection design, and lateral-system design - is performed by the Engineer of Record (EOR) and is not superseded by this standard; where this standard and the structural drawings conflict, the structural drawings govern.
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−### Steel connectors, plates, and fasteners furnished as part of the mass timber connection system shall comply with the corrosion-protection and material requirements of [[syncs/structural-steel-connections]].
+### Steel connectors, plates, and fasteners furnished as part of the mass timber connection system shall comply with the corrosion-protection and material requirements of [[sync/structural-steel-connections]].
### Connector hold-down and bearing locations shall be as shown on the connection shop drawings [[drawing: connection detail references]].
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### Exterior wall assemblies that incorporate combustible cladding or expose mass timber at the exterior face shall comply with NFPA 285 as required by the IBC.
−### Through-penetrations of fire-resistance-rated mass timber floors and walls shall be firestopped in accordance with [[syncs/firestopping]].
+### Through-penetrations of fire-resistance-rated mass timber floors and walls shall be firestopped in accordance with [[sync/firestopping]].
### Firestop locations and rated-assembly references shall be as shown on the life-safety drawings [[drawing: rated assembly and firestop schedule]].
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### Touch-up finish material matching the exposed mass timber finish shall be delivered to the Owner in a quantity sufficient for minor field repairs.