What is a concrete hatch?

A concrete hatch is the drawing convention used to fill a cut through cast in place concrete. It is drawn as scattered aggregate marks and fine speckles rather than evenly spaced lines, which distinguishes concrete from masonry or steel in the same section.

How do I import a concrete PAT file into AutoCAD?

Save the downloaded .PAT file into a folder listed under Options, Files, Support File Search Path. Run HATCH, set Pattern type to Custom, pick the concrete pattern by name and keep the hatch scale at 1 to get the module shown in the preview.

Can I use this concrete hatch in Revit?

Yes. Go to Manage, Additional Settings, Fill Patterns, choose Model, then New and Custom, import the .PAT file and set the import scale to 1. Metric templates expect a millimetre pattern, so export in millimetres for metric projects.

Can I change the aggregate scale?

Yes. The pattern size parameter scales the whole aggregate field. Increase it for large scale sections and reduce it for dense small scale details so the fill does not turn into a solid grey block when printed.

Concrete Hatch Generator

Create the traditional scattered aggregate concrete hatch and export it as a .PAT file.

Free

Material library

Choose a common building material as a starting point.

Concrete loaded. Adjust any parameter below.

Pattern parameters

These values are written into the PAT file.

Pattern name

Generated automatically from the pattern type and dimensions.

Units

Pattern size

Module of the material symbol. Scales the whole hatch.

Rotation

deg

Scale

Multiplies every exported distance in the PAT definition.

Live preview

900 mm wide

PAT definition

concrete_150.pat

;; Generated with ArchSupply Utilities - Hatch Pattern Generator;; Drawing units: millimetres (metric pattern);; Load in AutoCAD with HATCH > Custom, or in Revit via Manage > Additional Settings > Fill Patterns.*CONCRETE_150, Concrete: AR-CONC style aggregate and stipple, 150 mm module24.416615, 27.030415,32.150821, 18.5,50, 5.294406, -44.70559469.134574, 29.376095,48.166622, 18.5,50, 5.080071, -44.91992941.146729, 19.28641,39.703678, 18.5,50, 3.232998, -46.76700270.437519, 23.795502,5.498939, 18.5,50, 5.625895, -44.37410510.976528, 1.469924,9.777935, 18.5,50, 4.253151, -45.746849136.898943, 2.831997,32.360643, 18.5,50, 3.813739, -46.18626123.173533, 16.414413,37.114183, 27.75,75, 7.362649, -67.63735165.509162, 36.550566,27.100688, 27.75,75, 4.859546, -70.14045449.357585, 14.929302,50.137914, 27.75,75, 4.154777, -70.845223111.191225, 20.156209,37.820397, 27.75,75, 6.338446, -68.66155421.118192, 25.977352,14.263059, 27.75,75, 7.284496, -67.715504167.698224, 52.058616,76.699092, 55.5,150, 12.32167, -137.6783364.397465, 47.862306,53.776127, 55.5,150, 11.434695, -138.56530531.177604, 87.30221,74.209661, 55.5,150, 10.285959, -139.714041119.949938, 33.852637,139.992815, 55.5,150, 10.466796, -139.5332042.892089, 86.587022,68.021344, 55.5,150, 10.771712, -139.22828863.586068, 21.979563,22.784469, 55.5,150, 20.383019, -129.61698188.593027, 108.666081,52.224301, 55.5,150, 18.724616, -131.27538446.777332, 144.168173,2.820465, 55.5,150, 16.712592, -133.287408

PAT definition ready

PAT output is in beta. Verify the pattern scale after importing into your CAD or BIM application.

About the concrete hatch

Concrete is the most frequently hatched material on a set of construction drawings. It appears in every foundation, slab, retaining wall and column section, so the fill has to read clearly at 1:50 and still survive a 1:100 print.

The conventional CAD symbol for cast in place concrete is not a run of parallel lines. It is a field of short, randomly oriented aggregate strokes with finer speckles between them, close to the AR-CONC family shipped with AutoCAD. This generator builds that scattered aggregate field from real line families, so the exported pattern behaves like any other model pattern.

Adjust the pattern size to suit the drawing scale, rotate the field if you need to distinguish adjacent pours, then download the PAT file for AutoCAD or import it as a Revit fill pattern.

How to use the PAT file

Download the .PAT file, or copy the definition into your own pattern library file.
AutoCAD: place the file in a support path, then choose Hatch, Pattern type Custom and pick the pattern name.
Revit: Manage, Additional Settings, Fill Patterns, New, Custom, then import the .PAT file and set the import scale.
Metric patterns assume millimetre drawing units; imperial patterns assume inches.

Frequently asked questions

What is a concrete hatch?: A concrete hatch is the drawing convention used to fill a cut through cast in place concrete. It is drawn as scattered aggregate marks and fine speckles rather than evenly spaced lines, which distinguishes concrete from masonry or steel in the same section.
How do I import a concrete PAT file into AutoCAD?: Save the downloaded .PAT file into a folder listed under Options, Files, Support File Search Path. Run HATCH, set Pattern type to Custom, pick the concrete pattern by name and keep the hatch scale at 1 to get the module shown in the preview.
Can I use this concrete hatch in Revit?: Yes. Go to Manage, Additional Settings, Fill Patterns, choose Model, then New and Custom, import the .PAT file and set the import scale to 1. Metric templates expect a millimetre pattern, so export in millimetres for metric projects.
Can I change the aggregate scale?: Yes. The pattern size parameter scales the whole aggregate field. Increase it for large scale sections and reduce it for dense small scale details so the fill does not turn into a solid grey block when printed.

Related materials

Every material opens the same generator with its pattern preloaded.