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Underlay is a Minecraft mod that lets you place carpets (and anything else) under any block with space beneath it (e.g. chests, beds, signs, torches, etc.)!
Just right click a block face with a block to place it, (for example, under an upside-down stair), and you're done! Right click again with another item to replace it quickly, or left click it to remove it. Works in Survival too!
By default, you can place the following blocks as overlays: carpets, trapdoors, buttons, rails, slabs and pressure plates. To expand this to other blocks, such as grass, see "How to add support for more blocks (or exclude some)".
Join the Discord server for sneak peeks on upcoming updates!
How does this work?
They are not block entities!
Underlay adds these things called "overlays" but they're really more like underlays xd, essentially they are fake versions of the item you place - which lets you place two things in the same block space!
How to add support for more blocks (or exclude some)
In your Minecraft folder you can find config/Underlay/underlay.json. Use overlay_blocks to add blocks, exclude_blocks to exclude them, and to not allow overlays to be placed on certain blocks use target_exclude_blocks, like this:
{
"overlay_blocks": [
"minecraft:short_grass",
"mymod:shiny_block"
],
"exclude_blocks": [
"minecraft:oak_button",
"minecraft:rail"
],
"target_exclude_blocks": [
"minecraft:oak_door",
"minecraft:spruce_door"
]
}Mod Integration
Some versions of Underlay include integration with Create, Jade and Flashback.
All Versions
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[1.0.5] [26.3] Underlay v1.0.5
by Dooji on Oct 13, 2026
Download
- Fixes overlays in structures
- Added tag support to Underlay config
- Fixed some z fighting
- Added Sable support on NeoForge 1.21.1
[1.0.5] [26.1.2] Underlay v1.0.5
by Dooji on Oct 13, 2026
Download
- Fixes overlays in structures
- Added tag support to Underlay config
- Fixed some z fighting
- Added Sable support on NeoForge 1.21.1
[1.0.5] [26.3] Underlay v1.0.5
by Dooji on Oct 13, 2026
Download
- Fixes overlays in structures
- Added tag support to Underlay config
- Fixed some z fighting
- Added Sable support on NeoForge 1.21.1
[1.0.5] [26.2] Underlay v1.0.5
by Dooji on Oct 13, 2026
Download
- Fixes overlays in structures
- Added tag support to Underlay config
- Fixed some z fighting
- Added Sable support on NeoForge 1.21.1
[1.0.5] [26.1] Underlay v1.0.5
by Dooji on Oct 13, 2026
Download
- Fixes overlays in structures
- Added tag support to Underlay config
- Fixed some z fighting
- Added Sable support on NeoForge 1.21.1
[1.0.5] [1.21.11] Underlay v1.0.5
by Dooji on Oct 13, 2026
Download
- Fixes overlays in structures
- Added tag support to Underlay config
- Fixed some z fighting
- Added Sable support on NeoForge 1.21.1
[1.0.5] [1.21] Underlay v1.0.5
by Dooji on Oct 13, 2026
Download
- Fixes overlays in structures
- Added tag support to Underlay config
- Fixed some z fighting
- Added Sable support on NeoForge 1.21.1
[1.0.5] [1.21.1] Underlay v1.0.5
by Dooji on Oct 13, 2026
Download
- Fixes overlays in structures
- Added tag support to Underlay config
- Fixed some z fighting
- Added Sable support on NeoForge 1.21.1
[1.0.5] [1.20.1] Underlay v1.0.5
by Dooji on Oct 13, 2026
Download
- Fixes overlays in structures
- Added tag support to Underlay config
- Fixed some z fighting
- Added Sable support on NeoForge 1.21.1
[1.0.5] [1.20.1] Underlay v1.0.5
by Dooji on Oct 13, 2026
Download
- Fixes overlays in structures
- Added tag support to Underlay config
- Fixed some z fighting
- Added Sable support on NeoForge 1.21.1
[1.0.4-hotfix.1] [26.2] Underlay v1.0.4-hotfix.1
by Dooji on Oct 13, 2026
Download
- Now broadcasting overlay changes to everyone correctly (forge & neoforge)
- Fixed worldedit mixin fail
[1.0.4-hotfix.1] [26.1] Underlay v1.0.4-hotfix.1
by Dooji on Oct 13, 2026
Download
- Now broadcasting overlay changes to everyone correctly (forge & neoforge)
- Fixed worldedit mixin fail
[1.0.4-hotfix.1] [1.21.11] Underlay v1.0.4-hotfix.1
by Dooji on Oct 13, 2026
Download
- Now broadcasting overlay changes to everyone correctly (forge & neoforge)
- Fixed worldedit mixin fail
[1.0.4-hotfix.1] [1.20.1] Underlay v1.0.4-hotfix.1
by Dooji on Oct 13, 2026
Download
- Now broadcasting overlay changes to everyone correctly (forge & neoforge)
- Fixed worldedit mixin fail
[1.0.4-hotfix.1] [1.21.1] Underlay v1.0.4-hotfix.1
by Dooji on Oct 13, 2026
Download
- Now broadcasting overlay changes to everyone correctly (forge & neoforge)
- Fixed worldedit mixin fail
[1.0.4-hotfix.1] [1.20.1] Underlay v1.0.4-hotfix.1
by Dooji on Oct 13, 2026
Download
- Now broadcasting overlay changes to everyone correctly (forge & neoforge)
- Fixed worldedit mixin fail
[1.0.4] [1.21.1] Underlay v1.0.4
by Dooji on Oct 13, 2026
Download
- Added WorldEdit support
- Added a new option,
place_on_replaceable_blocks, false by default. In Underlay's config you can now set the OP level needed for the/underlaycommand, which you can edit config entries with. This specific option, if enabled, lets you place blocks inside of e.g. grass without it breaking.
[1.0.4] [1.21.11] Underlay v1.0.4
by Dooji on Oct 13, 2026
Download
- Added WorldEdit support
- Added a new option,
place_on_replaceable_blocks, false by default. In Underlay's config you can now set the OP level needed for the/underlaycommand, which you can edit config entries with. This specific option, if enabled, lets you place blocks inside of e.g. grass without it breaking.
[1.0.4] [26.2] Underlay v1.0.4
by Dooji on Oct 13, 2026
Download
- Added WorldEdit support
- Added a new option,
place_on_replaceable_blocks, false by default. In Underlay's config you can now set the OP level needed for the/underlaycommand, which you can edit config entries with. This specific option, if enabled, lets you place blocks inside of e.g. grass without it breaking.
[1.0.4] [26.1] Underlay v1.0.4
by Dooji on Oct 13, 2026
Download
- Added WorldEdit support
- Added a new option,
place_on_replaceable_blocks, false by default. In Underlay's config you can now set the OP level needed for the/underlaycommand, which you can edit config entries with. This specific option, if enabled, lets you place blocks inside of e.g. grass without it breaking.
[1.0.4] [1.21] Underlay v1.0.4
by Dooji on Oct 13, 2026
Download
- Added WorldEdit support
- Added a new option,
place_on_replaceable_blocks, false by default. In Underlay's config you can now set the OP level needed for the/underlaycommand, which you can edit config entries with. This specific option, if enabled, lets you place blocks inside of e.g. grass without it breaking.
[1.0.4] [1.20.1] Underlay v1.0.4
by Dooji on Oct 13, 2026
Download
- Added WorldEdit support
- Added a new option,
place_on_replaceable_blocks, false by default. In Underlay's config you can now set the OP level needed for the/underlaycommand, which you can edit config entries with. This specific option, if enabled, lets you place blocks inside of e.g. grass without it breaking.
[1.0.4] [1.20.1] Underlay v1.0.4
by Dooji on Oct 13, 2026
Download
- Added WorldEdit support
- Added a new option,
place_on_replaceable_blocks, false by default. In Underlay's config you can now set the OP level needed for the/underlaycommand, which you can edit config entries with. This specific option, if enabled, lets you place blocks inside of e.g. grass without it breaking.
[1.0.3] [26.2] Underlay v1.0.3
by Dooji on Oct 13, 2026
Download
- Updated Jade mixin on 26.1
- Added support for 26.2
- Performance improvements (rendering overlays a bit differently now, they are baked into chunks)
[1.0.3] [26.1] Underlay v1.0.3
by Dooji on Oct 13, 2026
Download
- Updated Jade mixin on 26.1
- Added support for 26.2
- Performance improvements (rendering overlays a bit differently now, they are baked into chunks)
[1.0.3] [1.21.11] Underlay v1.0.3
by Dooji on Oct 13, 2026
Download
- Updated Jade mixin on 26.1
- Added support for 26.2
- Performance improvements (rendering overlays a bit differently now, they are baked into chunks)
[1.0.3] [1.21.1] Underlay v1.0.3
by Dooji on Oct 13, 2026
Download
- Updated Jade mixin on 26.1
- Added support for 26.2
- Performance improvements (rendering overlays a bit differently now, they are baked into chunks)
[1.0.3] [1.21] Underlay v1.0.3
by Dooji on Oct 13, 2026
Download
- Updated Jade mixin on 26.1
- Added support for 26.2
- Performance improvements (rendering overlays a bit differently now, they are baked into chunks)
[1.0.3] [1.20.1] Underlay v1.0.3
by Dooji on Oct 13, 2026
Download
- Updated Jade mixin on 26.1
- Added support for 26.2
- Performance improvements (rendering overlays a bit differently now, they are baked into chunks)
[1.0.3] [1.20.1] Underlay v1.0.3
by Dooji on Oct 13, 2026
Download
- Updated Jade mixin on 26.1
- Added support for 26.2
- Performance improvements (rendering overlays a bit differently now, they are baked into chunks)
