Dry Ice Blasting for Listed Buildings

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Dry ice blasting is one of the best non-abrasive methods for restoring timber in listed buildings. It removes coatings without chemicals or water, making it ideal where preservation is critical.

Air Pressure & Performance

7 bar → ideal for most timber cleaning
Up to 10 bar → needed for heavy coatings (e.g. thick varnish, bitumen)

Key point:
👉 Always start low and increase gradually until the coating is removed without damaging the wood.

Important Considerations for Timber

1. Wood hardness matters

Softwoods (pine, cedar) → lower pressure required
Hardwoods (oak, teak) → can take more pressure

2. Grain effect

Dry ice can:

Remove softer grain between harder growth rings
Leave a slightly textured / raised grain finish

👉 This is often desirable for beams, but:

For panelling or floors → may need a light sand after

Dry Ice vs Sand Blasting (Listed Buildings)

Dry Ice Blasting

Gentle, controllable
Preserves detail
Approved for heritage work
No mess or water

Sand / Abrasive Blasting

Aggressive
Can damage surface detail
Removes material, not just coating
Usually harder to get approval

👉 In most listed building scenarios, dry ice is the safer starting point.

Typical Coatings You Can Remove

Dry ice blasting works well on:

Paint (modern & historic layers)
Varnish & lacquer
Bitumen coatings
Smoke & fire damage
Soot & carbon deposits
Oils & grease
Wax finishes
Biological contamination (mould, algae)

Wood Cleaning Playbook

Use this as a starting guide 👇

Oak Beams (Hardwood)

Pressure: 6–8 bar (up to 10 bar for heavy coatings)
Pellet size: medium to large
Notes: Handles higher pressure well, slight grain lift possible

Pine Beams / Softwood

Pressure: 4–6 bar
Pellet size: small to medium
Notes: Easy to damage – go steady

Decorative Panelling

Pressure: 3–5 bar
Pellet size: small
Notes: Focus on preserving detail and smooth finish

Wooden Floors

Pressure: 4–6 bar
Pellet size: small to medium
Notes: Expect to follow with light sanding for uniform finish

Heavily Coated Timber (Paint / Bitumen)

Pressure: 7–10 bar
Pellet size: medium to large
Notes: May require multiple passes

Best Practice

Always start at low pressure
Increase gradually until coating is removed
Test on a hidden area first
Adjust:
- Pressure
- Pellet size
- Distance from surface

👉 The goal is simple:
Remove the coating, not the wood

Why Use Dry Ice Blasting on Listed Buildings?

Non-abrasive (when used correctly) – protects original timber
No water – avoids swelling, staining, or rot risk
No secondary waste – CO₂ sublimates (turns to gas)
Suitable for heritage approval – often accepted for listed building work

In many cases, dry ice blasting can be approved where traditional blasting methods would be rejected.

Final Thoughts

Dry ice blasting gives you a controlled, heritage-friendly way to restore timber without the risks of traditional blasting or chemicals.

For listed buildings, it’s often the difference between:

Preserving character
or permanently damaging it

👉 Want to talk about our range of dry ice blasting machines? Contact CoolBlast for expert advice.