Motif

Rat-trap bond pattern — free hatch (.pat), texture & 3D tiles

Rat-trap bond is a brick layout built from 2 tiles per repeat (sizes 225 × 112.5, 112.5 × 75 mm), repeating on the lattice a = (300, 0) mm, b = (150, 112.5) mm, a cell of 33750 mm². The seamless texture repeat is 300 × 225 mm. Download it as a CAD hatch, a seamless texture or SVG and DXF lines, count the tiles for your room, or build it as real 3D tiles in SketchUp. All free.

Rat-trap bond tile pattern: tiles drawn with their joints

Rat-trap bond in numbers

CategoryBrick bonds
Tiles in one repeat2
Lattice vector a(300, 0) mm
Lattice vector b(150, 112.5) mm
Repeat cell area33750 mm²
Tile sizes225 × 112.5, 112.5 × 75 mm
Seamless texture repeat300 × 225 mm
Default shiner length (with joint)225 (range 100–600)
Default rowlock face width (with joint)75 (range 20–200)
Default course height (with joint)112.5 (range 30–250)

Free downloads for Rat-trap bond

Hatch units are millimetres at the default tile size. For other sizes use the hatch page or the editor, which exports every format at the size you set.

Rat-trap bond tile calculator

Enter the room, grout and tile size. The count comes from the same engine that lays the 3D tiles, so the cut tiles are real cuts against your room edges (a 4 × 3 m room is shown first). More patterns: tile calculator.

Full tiles
676
Cut tiles
66
Whole tiles used
742
Area (net)
12 m²
Tile area bought
12.64 m²
Waste from cuts
5.3 %
Tiles to order
817
Tiles by size
SizeFull tilesCut tiles
225 × 112.5 mm33840
112.5 × 75 mm33826

Open it in the editor or in SketchUp

Open Rat-trap bond in the editor

Use it in SketchUp (10 free uses a day) motif.rbz

Questions about Rat-trap bond

How many Rat-trap bond tiles do I need for a 4 × 3 m room?

With the default tile size and a 3 mm joint, a 4 × 3 m floor needs 676 full tiles and 66 cut tiles (742 whole tiles counting each cut tile as one). The net area is 12 m² and the tiles bought cover 12.64 m², so cutting alone wastes 5.3 %. Enter your own room and tile size in the calculator on this page.

Is the Rat-trap bond hatch exact?

Yes. The .pat file draws the tile edges exactly: every edge direction of this pattern is parallel to a lattice vector, so a PAT line family reproduces it without approximation. Units are millimetres and the pattern name inside the file is rat-trap-bond.

How do I use the .pat file in AutoCAD?

Copy the .pat file into a folder that is in AutoCAD's Support File Search Path (Options > Files), keep the file name (the pattern name inside the file matches it), then pick the pattern in the HATCH command. If Windows blocks the download, right-click the file, open Properties and tick Unblock.

How do I use the .pat file in Revit?

In Revit open Manage > Additional Settings > Fill Patterns, click New, choose Custom and browse to the .pat file. Use the model variant when the pattern must keep its real size on the building.

What is the repeat size of Rat-trap bond?

One repeat of the lattice covers 33750 mm² with 2 tiles. The smallest rectangle that repeats seamlessly in both directions, which is what a texture image needs, is 300 × 225 mm at the default sizes.

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