Hoop Iron for Plastering
Hoop iron plays a crucial role in plastering by reinforcing areas prone to cracking. Plasterers use galvanised hoop iron strips embedded in the plaster coat to bridge joints, reinforce corners, and prevent cracks at stress points.
Where to Use Hoop Iron in Plastering
- At joints between different materials — Where brick meets concrete, or where old plaster meets new
- Over cracks — As reinforcement when repairing existing cracks in plaster
- At corners and edges — To reinforce areas subject to impact damage
- Around openings — Above and below windows and doors where diagonal cracking commonly occurs
Application Method
- Apply the first coat of plaster (scratch coat)
- While the scratch coat is still wet, press the hoop iron strip into the plaster
- Ensure the hoop iron is fully embedded with no edges protruding
- Apply the finishing coat of plaster over the hoop iron
- The hoop iron should be completely concealed within the plaster thickness
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For plastering applications, 30mm x 0.6mm galvanised hoop iron is the standard choice. The galvanised coating is essential to prevent rust staining through the plaster finish.
Frequently Asked Questions
Can you use hoop iron in plaster to prevent cracking?
Yes, hoop iron is commonly embedded in plaster as reinforcement at joints between different materials, over existing cracks, and at stress points around openings. It helps distribute stress and prevent crack propagation.
Does hoop iron rust through plaster?
Not if galvanised hoop iron is used. The hot-dip galvanised coating prevents rust. Never use ungalvanised hoop iron in plastering as it will rust and stain the plaster.
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