Underlay
Modby Dooji
Place any block (such as carpets) inside anything!
Type
Mod
CurseForge Downloads
8,350,609
CurseForge ID
1263531
Modrinth Downloads
917,737
Modrinth ID
iltKD9qU
Last Updated
Jul 27, 2026
Description
**Underlay** is a Minecraft mod that lets you place carpets (and more) 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!
[](https://discord.gg/UPmnyM9YcY)
---
### 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, and `exclude_blocks` to exclude them, like this:
```
{
"overlay_blocks": [
"minecraft:short_grass",
"mymod:shiny_block"
],
"exclude_blocks": [
"minecraft:oak_button",
"minecraft:rail"
]
}
```
Compatibility
Mod Loaders
Fabric
Forge
Neoforge
Game Versions
1.12.2
1.20
1.20.1
1.21
1.21.1
1.21.2
1.21.3
1.21.4
1.21.5
1.21.6
+9 more
Screenshots
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