Brick Slip Corners, Reveals and Edges Explained

Draw each wall face and label outside corners, inside corners, window sides, window heads, door returns and exposed ends. An outside corner projects towards you; an inside corner is where two walls meet inward. They are different details and do not automatically use the same pieces.

A reveal is a surface, so it has an area: width or height multiplied by depth. The edge where it meets the main wall may also need a corner unit. Recording both does not mean ordering both a corner and a flat slip over the same patch of wall. Mark which material covers each part of the drawing.

Compare the brick slip products with the corner detail in mind. Ask whether your selected blend has matching corners, how they are made, their face and return lengths, their thickness and the selling unit. A flat-slip sample alone does not confirm that a matching corner format exists.

A wrapped corner can carry the brick appearance around a projection. Two flat pieces meeting at an edge create a different junction and may expose a cut face. Decide that detail with your installer rather than assuming an on-site cut will reproduce a manufactured corner. Where an angle is not square, provide the measured angle before requesting pieces.

Example assumptions: two outside corners, each 2.4m high, using a nominal 65mm-high slip with a 10mm horizontal joint. The nominal course module is 65 + 10 = 75mm. Each corner therefore spans 2,400 ÷ 75 = 32 nominal courses, giving 64 corner units for the two corners before an allowance.

If a 10% allowance is appropriate for this example, 64 × 1.10 = 70.4, rounded up to 71 units when sold singly. Round to the actual pack quantity if the selected corners come in packs. This is a modular estimate: the installer must resolve the top and bottom joints, cut courses and alignment with neighbouring work in the final setting-out.

Record each vertical run separately before adding them together. Horizontal opening heads, soldier courses and other special arrangements need their own detail; do not turn their length into a vertical corner count without checking how the units will be oriented.

Measure all surfaces that will be covered, including reveals. Then ask the supplier or installer how much of each measured face the selected corner units replace, using the agreed joint module and actual corner geometry. Deduct that allocated coverage from the flat-slip requirement before applying the agreed flat-slip allowance and rounding to boxes.

For example, if a checked layout assigns 0.75m² of a 6m² total facing area to corners, the flat area is 6 − 0.75 = 5.25m². Those figures are hypothetical allocations, not a coverage claim for any corner product. The point is to split the same 6m² between formats rather than buy 6m² of flats plus corners covering part of it.

The calculator estimates full-slip boxes from the entered net wall area and shows corner units separately. It does not automatically subtract the faces covered by your chosen corners. Have that overlap reconciled before ordering.

Measure reveal depth at several positions, especially on older openings. Check the complete wall build-up against window frames, doors, skirtings and adjacent finishes. A return that fits the unfinished wall may meet a different line once the board, adhesive and slips are installed.

For a wall ending in open space, agree whether the edge returns, meets a trim or finishes against another material. Keep any movement detail required by the selected system clear. At external openings, weathering and drainage details belong to the complete cladding design; follow the external-use guide before treating the corner as a purely decorative choice.

• Name the blend and identify every required flat, corner and special format.
• Give the height of each outside corner and dimensions of each reveal.
• State the face height, joint width, bond and starting course.
• Show how corner coverage has been removed from the flat-slip quantity.
• Confirm allowances, pack rounding, availability and the exposed-edge finish.

The 10mm T spacers are a relevant accessory when that joint size is specified; their presence does not make 10mm right for every layout. Keep the approved drawing with your measurement record. For the basic terminology and planning sequence, start with the brick slips overview.