alternative to metal lathing

You will find rib lath has more strength and key than eml. Eml is a render carrier.

But as suggested above. Treat your existing surface first with a bonding agent like an sbr slurry or Rendagrip. Build out your hollows and let cure. Use mesh fibres in your mix. Them fix your wire mesh.

Personally, after going to the trouble of building out the stone as described above, I would use a modern polyester rendering mesh 8-10 mm mesh. Maybe 6mm fibreglass strands as well for good measure.

Parex TV 10 mesh is ideal for sand and cement. The usual 4mm mesh is too small for sand and cement.

Once you have got that far just render as normal.

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Product Overview

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FibaLath is an innovative fiberglass lath for use in stucco applications and exterior/interior manufactured stone and brick facades. The unique three-dimensional profile of FibaLath is self-furring and attaches the same way as metal lath. FibaLath is also lightweight and pliable, making it easier and safer to cut and carry compared to metal lath.

Benefits

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• Alkali-resistant for long term performance - will not rust or rot
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• Over four times lighter than metal lath (per unit area)
• Meets International Building Code® (IBC) and International Residential Code® (IRC)