MAN Magazine Summer 2019






There has been an increasing

demand for natural products

in the building sector, and

we caught up with Black

Mountain Insulation Ltd to

find out what difference

going natural can make when



he British sheep-wool industry

produces over 2.1 million

tonnes of wool each year:

Natural insulation makes use

of this ‘waste’ wool that is rejected and

rendered useless by other industries.

Natuwool, the sheep’s wool used in the

production of Black Mountain Insulation,

is by-products of other industries and the

minimal binder used for manufacturing

contains recycled material.

Sheep’s wool is biodegradable

and therefore can be composted into

the ground to enrich the soil and remain

part of the earth’s natural cycle: Because

of this, Insulation made of sheep’s wool

can be recycled or incinerated to produce

additional energy, whereas manmade

mineral fibre materials currently have no

practical recycling system in place and can

only be properly disposed of into landfill

sites... which is not a sustainable option!

Some man-made mineral fibre materials

are unpleasant to handle and require the

use of protective garments, masks and

eyewear to be safely installed or removed,

unlike Black Mountain sheep’s wool

insulation – which is safe to handle without

protective clothing.

The wool used in the products

permanently absorbs significant quantities

of carbon dioxide during the growth cycle.

Therefore, natural fibre insulations are


‘carbon negative’

– locking up a

substantially higher

level of carbon

than what is used during manufacturing.

“We recognise whilst maintaining a

continuous effort to provide customers

with high quality, natural products there

is a responsibility to also give serious

consideration to the environment and

our society. This is why Black Mountain

products are made up of 95% natural

fibre content – one of the highest available

on the market – and use up to 90% less

embodied energy in comparison to many

man-made insulation products.”

Condensation is one of the biggest

challenges facing the building industry

today. Excess moisture can not only have

a detrimental effect on the structure of a

building but it is also a root cause of mould,

which can have an adverse effect on the

welfare of its inhabitants.

Natuwool is a hygroscopic fibre and is

therefore able to absorb, store, and release

moisture faster than most other materials;

absorbing over 35% of its own weight in

moisture without significant changes to

thermal performance, whereas the thermal

performance of man-made mineral fibre

insulation deteriorates when condensation

is present. It also has the ability to

absorb moisture that reduces the risk of

consequent mould and bacteria activity.

Sheep’s wool insulation is ideally suited

to timber-frame structures as it has a natural

synergy with wood. The sheep’s wool fibres

draw out the moisture, conditioning the

wood and act as a ‘buffer’ to protect the



fabric of the

building. These

insulations have

the capability of reducing energy loss and

providing building inhabitants with free

passive energy absorbed from solar gain,

whilst the high thermal mass helps reduce

peak temperatures.

Independent research clearly illustrates

that as moisture levels increase no

significant changes to thermal conductivity

will occur. This consistency demonstrates

the versatility of sheep’s wool insulation

and an ability to cope in contrasting

environments and levels of humidity.

“By allowing the structure to breathe

whilst maintaining thermal resistance Black

Mountain Natuwool helps to conserve the

building, improve air quality and maximise

thermal efficiency.”

Black Mountain sheep wool insulation

achieves a fire performance rating of Euro

Class E which ensures that the material

is flame retardant. This means that the

product will not cause or exacerbate a fire.

This flexible insulation is ideal for use

in confined spaces; lofts, rafters, walls

and floors and its ease of use makes

the installation process faster and more

efficient. Natuwool is the preferred choice

of organisations such as Historical Scotland,

The National Trust and English Heritage.

For more information contact


com or visit


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