Sheep’s wool

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Sheep’s wool insulation is made from sheep wool fibres that are either mechanically held together or bonded to form insulating batts and rolls.

It is bound together with a polyester binder and has treatments for fire and insect resistance added. Sheep’s wool insulation can be cut to size and used in the same way as other forms of insulation. Some manufacturers offer 100 per cent sheep’s wool insulation while others provide wool-rich insulation (75 per cent wool) mixed with recycled polyester.

It is typically used between rafters, joists and timber studs in timber ‘breathing’ wall constructions. It has good acoustic properties and is a natural by-product from a renewable source.


Between rafters, joists and timber studs in timber ‘breathing’ wall construction


Waste product from renewable source
Good acoustic properties
Can regulate humidity

PIR = Superior thermal performance

Because of its superior thermal performance PIR insulation offers optimal insulation value meaning a thinner layer will achieve the same insulation properties.  This has other benefits, as using thicker insulation will mean a larger building footprint or smaller internal dimensions for a property.

The diagram shows the typical thicknesses of different wall insulation materials needed to achieve an R value of 4.5.