Complete guide to Improved Stacker in Garry's Mod - quickly duplicate and stack props with precise offsets, rotation, and automatic constraints

Improved Stacker

Improved Stacker lets you rapidly duplicate props in any direction with precise control over offset, rotation, and automatic constraints. Essential for building walls, columns, stairs, and repeating structures.

Workshop Addon

Subscribe to Improved Stacker on the Steam Workshop. Servers may already have this installed.

Basic Controls

Action	What It Does
Left-click	Stack props (creates full stack count)
Right-click	Stack single prop
E + Left-click	Increase stack count by 1
E + Right-click	Decrease stack count by 1
Reload (R)	Cycle stack direction
Shift + Left/Right-click	Alternative to E key (if enabled)

Stack Directions

Press Reload (R) to cycle through 6 directions:

Direction	Description
Up	Stack vertically upward
Down	Stack vertically downward
Front	Stack forward (away from you)
Back	Stack backward (toward you)
Left	Stack to prop's left
Right	Stack to prop's right

Direction Arrows

When aiming at a prop, colored arrows show the current stack direction.

Tool Settings

Open spawn menu (Q) to access settings:

Stacking Options

Setting	Description
Stack Mode	World (global axes) or Prop (relative to prop rotation)
Stack Count	Number of props to create (1-15 default max)
Stack Relative	Each prop rotates based on previous (for curves)
Ghost All	Show all stacked positions or just the first

Offset (Spacing)

Setting	Description
Offset X	Spacing on X axis (positive/negative)
Offset Y	Spacing on Y axis
Offset Z	Spacing on Z axis

Use "Reset Offsets" button to set all to 0.

Rotation Per Stack

Setting	Description
Pitch	Tilt forward/backward per prop
Yaw	Rotate left/right per prop
Roll	Spin per prop

Use "Reset Angles" button to set all to 0.

Auto-Apply Options

Setting	Description
Freeze	Stacked props spawn frozen
Weld	Stacked props welded to each other
NoCollide	Stacked props don't collide with each other
Apply Material	Copy original prop's material
Apply Color	Copy original prop's color
Apply Physics	Copy gravity, weight, physics material

Building Walls

Spawn a wall segment — flat plate or PHX panel

Freeze it in position with Physgun

Set direction to Up (press R until arrow points up)

Set stack count (E + Left-click to increase)

Left-click the prop to stack vertically

Change direction to Front or Right to extend horizontally

Repeat to build the full wall

Zero Offset = No Gaps

Keep all offset values at 0 for seamless stacking where props touch edge-to-edge.

Building Stairs

Create stairs using rotation per stack:

Spawn a step prop (thin platform)

Place and freeze the first step

Set direction to Front (or direction stairs should climb)

Set Offset Z to step height (e.g., 10-20 units)

Set stack count for number of steps

Left-click to create staircase

For spiral stairs, enable "Stack Relative" and add Yaw rotation per step.

Building Curves

Use Stack Relative mode with rotation:

Enable "Stack Relative" checkbox

Set a small Yaw value (e.g., 5-15 degrees)

Stack props — each rotates relative to the previous

This creates arches, circular walls, or spiral structures.

Server Limits

Server admins can set limits via console:

ConVar	Description
`stacker_max_count`	Max props per stack (default: 15)
`stacker_max_total`	Max total stacker props per player
`stacker_max_offsetx/y/z`	Max offset distance
`stacker_force_freeze`	Force props to spawn frozen
`stacker_force_weld`	Force props to be welded
`stacker_force_nocollide`	Force no-collide
`stacker_stayinworld`	Prevent stacking outside map
`stacker_delay`	Cooldown between stacks

Common Problems

Quick Reference

Task	How
Stack multiple	Left-click
Stack one	Right-click
Increase count	E + Left-click
Decrease count	E + Right-click
Change direction	Reload (R)
Seamless stacking	Set all offsets to 0
Build curves	Enable "Stack Relative" + add Yaw

Stacker Tool Guide