Sawdust insulation is a fairly poor thermal insulation with extremely high ignitability. An additional insulation can be added by leaving the old sawdust insulation on place. The most common way is to insulate walls at the same time than outside wall needs to be renewed, but is also possible to add insulation to inside of wall.
If you want to make the thermal performance of the external wall still more efficient, also the sawdust insulation needs to be replaced with Paroc stone wool, which insulates heat twice as well as sawdust insulation. Often this also helps get rid of the somewhat musty smell in old houses. The work procedure is best done from the outside when renewing the external cladding.
The most effective way to insulate an old sawdust wall is to remove old material away and replace it with new PAROC stone wool. In this way it is possible to maximise the insulation efficiency of wall thickness.
Installation instructions:
The work follows the instructions on the right up corner except that the sawdust will be replaced with new wool and second layer of insulation can be added directly on replaced layer.
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