| 1 | light | Emit light (a light value must also be set) |
| 2 | Slick | ? |
| 4 | Sky | Display the skybox (worldspawn only) |
| 8 | Wrap | Enable water deformation |
| 16 | Trans33 | Almost invisible |
| 32 | Trans66 | Almost opaque |
| 64 | Flowing | Waterfall effect, Wrap must be enabled |
| 128 | NoDraw | Don't render, Sky must be enabled (worldspawn ) |
| 256 | Hint | (See the Hint Brush chapter) |
| 512 | Skip | (See the Hint Brush chapter) |
| 1024 | Specular | ? |
| 2048 | Diffuse | ? |
| 4096 | Alpha | If the texture has an alpha layer, use it to render the surface |
| 8192 | Mirror | ? |
| 16384 | Wndw33 | ? |
| 32768 | Wndw66 | ? |
| 65536 | 10000 | ? |
| 131072 | 20000 | ? |
| 262144 | 40000 | ? |
| 524288 | Water | This surface is made of water |
| 1048576 | Concrete | This surface is made of concrete (default) |
| 2097152 | Fabric | This surface is made of fabric |
| 4194304 | Gravel | This surface is made of gravel |
| 8388608 | Metal | This surface is made of metal |
| 16777216 | Metal Lite | This surface is made of metal |
| 33554432 | Tin | This surface is made of metal |
| 67108864 | Wood | This surface is made of wood |
| 134217728 | Reflect Fake | ? |
| 268435456 | Reflect light | ? |
| 536870912 | 40000000 | ? |
| 1073741824 | 80000000 | ? |
| 1 | Solid | Solid (default) |
| 2 | Window | The brush cannot "close" an area, surfaces back-culling |
| 4 | Aux | ? |
| 8 | Lava | Hazardeous liquid |
| 16 | Slime | Hazardeous liquid |
| 32 | Water | Liquid |
| 64 | Mist | Non-solid |
| 128 | Fence | The brush cannot "close" an area, render both side of each surface |
| 256 | 100 | (See the Hint Brush chapter) |
| 512 | 200 | (See the Hint Brush chapter) |
| 1024 | 400 | ? |
| 2048 | 800 | ? |
| 4096 | 1000 | If the texture has an alpha layer, use it to render the surface |
| 8192 | 2000 | ? |
| 16384 | 4000 | ? |
| 32768 | 8000 | ? |
| 65536 | Player Clip | Invisible solid surface (clients only) |
| 131072 | Monster Clip | Invisible solid surface (NPCs only) |
| 262144 | current_0 | ? |
| 524288 | current_90 | ? |
| 1048576 | current_180 | ? |
| 2097152 | current_270 | ? |
| 4194304 | current_up | ? |
| 8388608 | current_down | ? |
| 16777216 | origin | Used to define the origin of an entity (the rotation axe for example) |
| 33554432 | monster | ? |
| 67108864 | corpse | ? |
| 134217728 | detail | This brush WILL subdivide the BSP surface tree but will NOT affect VIS processing |
| 268435456 | translucent | This brush is see-through |
| 536870912 | Ladder | Can be climbed like a ladder |
| 1073741824 | 40000000 | ? |
| 2147483648 | 80000000 | ? |