A) Removing sawdust insulation

Sawdust in old wall structures has fairly poor thermal insulation capability with extremely high ignitability. If you want to improve the thermal performance of the external wall more, replace sawdust insulation with PAROC stone wool. It insulates heat twice as well as sawdust insulation. Replace the insulation at the same time when you renew the external cladding. By replacing the old inefficient insulation with more effective insulation, you maximise the energy efficiency of the wall with only a minimal increase in the thickness of the structure.

Ventilated timber frame wall, renovation
  • Timber cladding 
  • Ventilation gap
  • Wind protection insulation: PAROC WPS 3n
  • Thermal insulation: old sawdust replaced with stone wool insulation PAROC eXtra
  • Boarding
  • Vapour/air barrier
  • Internal surface

B) Additional Insulation interior side of sawdust insulated wall

When you want to improve the energy efficiency of an old wall structure but the old timber cladding is in good condition, install additional insulation on the interior side of the wall. At the same time, you can update room linings.

Ventilated timber frame wall with internal insulation
New structure:
  • Internal surface 
  • Vapour/air barrier
  • Timber studding / PAROC eXtra
Old structure:
  • Boarding 
  • Lining paper
  • Sawdust insulated timber frame wall
  • Boarding
  • Ventilation gap
  • Timber cladding
 

C) Additional insulation, exterior side of sawdust insulated wall

The most common way to add supplementary insulation to an old sawdust house is to add an extra insulation layer on the outside of wall. Always install supplementary insulation when renovating or changing the external cladding. Remember that it’s easy to add supplementary foundation insulation at the same time.

Saw dust insulated wall, additional external insulation
New structure
  • Timber cladding 
  • Ventilation gap
  • Wind protection board or insulation
  • Timber studding / PAROC eXtra
Old structure
  • Boarding 
  • Lining paper
  • Sawdust insulation
  • Boarding
  • Vapour/air barrier
  • Internal surface