Why Does Project Sintered Stone Crack? Check These Stages Before Blaming the Material
Investigate crack location, impacts, substrate and cabinet movement, support and span, adhesives and fabrication before assigning cause.
A crack may have more than one cause
After a crack appears, the material supplier may blame installation, the installer may blame the substrate, while the site team suspects a material defect.
A practical investigation considers the material, fabrication, transport, substrate, installation and use together.
Step 1: Identify where the crack is
Check whether it is near a sink or hob cutout, an inside corner, edge, joint, fixing point or unsupported area.
Each location suggests different risks. Around a cutout, inspect its position, inside corners and edge distances; in an unsupported area, inspect support and span.
Step 2: Check for impact
Large slabs can be struck during transport, unloading, lift handling, movement on site and installation.
Some damage does not cause an obvious break immediately and may emerge during later use. Incoming inspection, transport records and installation photos are therefore important.
Step 3: Inspect the substrate and cabinets
Substrate movement is easily overlooked in many project failures.
Timber substrates and cabinets can be affected by moisture, temperature and structural stiffness. If they deform significantly, the relatively rigid slab and adhesive layer may receive added stress.
Step 4: Check support and span
High material strength does not mean a slab can bridge unlimited unsupported distances.
Inspect support spacing, overhang length, backing boards, cabinet structure and edge support. Around worktops, sinks and hobs, structural conditions should be settled before fabrication.
Step 5: Check adhesive and fabrication
The adhesive type, specified bond layer, correct treatment of cut edges and stress concentration at inside corners can all affect the result.
Simply filling the visible crack without finding a substrate, support, cutout or fixing problem may lead to another crack.
What should you do after finding a crack?
Take photos and video, pause further work in the area, retain batch details, layout drawings, fabrication records, delivery notes and installation photos, then arrange a joint inspection by the responsible parties.
Use professional testing or assessment where necessary. Identify the cause before repair instead of merely covering the crack with adhesive.