A Skylark block showing insulation located between the 2 block parts.

Skylark blocks are designed to have insulation pre-fitted in the workshop, so they arrive on site ready to be installed. However there are a few junctions between blocks where extra insulation may need to be fitted during installation.

It is essential that there are no gaps in the insulation, and no un-insulated cavities.

You may also choose to insulate internal floors, to prevent noise transmission within the building.

What type of insulation can be used?

We recommend specifying a moisture free, non combustible insulation material. We typically use a soft-fill insulation roll as it's high performing and straightforward for manufacturers to fully fill the block cavities with,  like this insulation made from recycled plastic.

Insulation thickness

The standard insulation depth in the walls is 250mm (in the case of Skylark 250) or 200mm (in the case of Skylark 200). In roof or floor blocks you can add more, often up to 350mm.

Usually it is not possible to buy insulation at these depths, so this thickness is made up by using multiple layers.

Filling gaps

There is a small uninsulated gap where floor blocks (ground and upper levels) meet the walls, in line with the wall’s service cavity. This needs filling with insulation in-situ once the frame is assembled. 

Adding extra insulation

The standard wall depth offers an excellent level of energy efficiency (see WikiHouse performance), however it does still allow some thermal bridging through the timber. So if you are in an extremely cold climate, you may want to allow for a layer of rigid insulation to the outside of the chassis before wrapping and cladding. 

We suggest a continuous layer of a material like a wood fibre external insulation board. 

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