Retrofitting Old Walls with Ventilated HPL in Ireland – A Simple How-To

1. Check the Wall First – Easy Flowchart

Survey → Decide → Fix

1. Tap & Look
   • Cracked render? ➜ Chip off loose bits.
   • Rising damp line? ➜ Inject DPC or tank inside.
2. Moisture Meter
   • < 12 % → Good to go.
   • 12–18 % → Add breathable base coat.
3. Thermal Camera (optional)
   • Big blue spots? ➜ Inject cavity beads before cladding.

Print the flowchart and tick each box—no fancy software needed.

2. Align Brackets on Bumpy Stone

Irish stone walls are rarely perfect. Quick tricks:

• Self-levelling laser – mark a true vertical line every 600 mm.
• Shim with stainless washers – bring brackets forward until rails sit flat.
• Use long-slot brackets – ±15 mm play makes life easier on wavy surfaces.

Once the rails feel smooth under a straight edge, the HPL sheets will hang dead-flat.

3. Thermal Upgrade Payback – The 5-Minute Maths

*Typical 140 m² semi-D in Galway.
**Gas or heat-pump adjusted.

Extra spend for HPL retrofit: ~€24 000.
Annual saving: about €3 375.
Simple payback: < 5 years.

After that, the lower bill is pure profit—and the house moves up at least two BER bands.

4. See the Difference – IR Pictures Before & After

1. Before: Big orange patches mean heat leaking fast.
2. After: Wall glows cool blue; only doors and windows show warm outlines.

Snap two phone-camera FLIR shots and add them to your hand-over report—clients love proof!

Key Take-Aways

• A quick wall survey avoids surprises later.
• Shims + slotted brackets straighten out old stone.
• Ventilated HPL cuts heat loss by ≈80 %.
• Payback in under five years, plus a cosier home.

Lightweight HPL turns draughty cottages into snug, stylish homes—without breaking the bank.