Key points

  • Traditional cladding system using interlocking panels.
  • Principally used in façade cladding, on flat or curved areas.
  • Weather-tight from 25º of pitch and above if used in roofing.
  • Attractive design layouts complement different architectural styles.

Basic system information

  1. elZinc® flat lock shingle tray
  2. Flat lock dominant joint
  3. Flat lock transversal joint
  4. Undercloak
  5. Overcloak
  6. Stainless steel clip (can also be made of the same zinc as the cladding).
  7. Seam centres dimension, normally 430 to 600mm

recortada

Appearance

Depending on the layout of the joints, the system can either be directional or not.  The seams themselves are very discrete, but they are highlighted by the shadows they cast in sunny weather, making them clearly visible especially on lighter finishes where the contrast is greatest.

This system is not profiled, so oil canning is normally less apparent than with the angle seam system.

Fixing and dimensioning

The width of the shingles should be dimensioned using the information in “Designing with elZinc“.

Each flat lock shingle is indirectly fixed along both out-turned folds (undercloaks) using stainless (or zinc) clips.  The number of clips per m2 should be according to table contained in “Designing with elZinc“.

IMG_GYEONGJU STARBUCKS COREA7676 recortar

Design possibilities

As well as those designs shown for the angle seam for which rectangular shingles are employed, square flat lock shingles are often used but set at 45º.  This arrangement can be either fully interlocked or set to leave a small overlap giving a more traditional artisan feel to the cladding.

Fully interlocked shingles at 45º

Seam centres: 430, 530, 580 and 600mm

Effect: Visually ‘disconnects’ cladding from openings and the contours of the façade, so no care need be taken to coordinate opening positions with seam centres

despiece cuad 452

40mm free edge interlocked shingles at 45º

Seam centres: 430, 530, 580 and 600mm

Effect: Has a more artisan feel than fully interlocked shingles.  Also sets the cladding apart from other elements of the façade (openings, corners etc).

JUNTA PLANA 45º with tooth effect2

Other designs are possible of course, as long as the shapes tessellate and the joints shed water correctly. As an example, a rhomboid design is illustrated below. Note how the same façade will change its apparearance according to the shadows cast by the flat lock joints at different times of the day.

Staggered design

It is advised to limit shingle length to 2m.  Typical axis dimensions are 430, 530, 580 and 600mm.  It has a visually unifying effect on the façades it dresses.

despiece tres hor 22

Different shingle widths

Without any horizontal reference. This design adds character and identity to the façade and it is quite horizontal even in the flat lock system.

despieces escamas aleatorio y 3 anchos2

Different shingle widths

Without any horizontal reference. This design adds character and identity to the façade and it is quite horizontal even in the flat lock system.

JUNTA PLANA DESPIECE2

Different shingle widths

Without any horizontal reference. This design adds character and identity to the façade and it is quite horizontal even in the flat lock system.

JUNTA PLANA DESPIECE22

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Façade cladding systems overview: Flat lock joint | Download

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