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Help / F.A.Q

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General FAQ

-F.A.Q: Can I use natural insulation as a hot water tank lagging jacket?

-F.A.Q: Ceiling Joists

-F.A.Q: External Walls

-F.A.Q: How does Thermo Hemp and Thermafleece products compare with alternative materials?

-F.A.Q: How much insulation do I need?

-F.A.Q: Insulated Pitched Roofs

-F.A.Q: What if I have glass/mineral fibre insulation installed already?

-F.A.Q: What is embodied energy?

-F.A.Q: Why use natural insulation?

-F.A.Q: Do you deliver?

-F.A.Q: Why should I insulate?

- Can I use natural insulation as a hot water tank lagging jacket?

Yes. Our natural insulation products can be placed beneath the existing lagging jacket or can be held in place with a layer of old blankets.

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- Ceiling Joists

For attics in existing houses, regulations require a minimum of approximately 120mm of Thermo Hemp or Thermafleece sheep wool insulation. For attics in new houses, the regulations require a minimum of 240mm thick Thermo Hemp or Thermafleece.



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- External Walls

For external walls in a timber frame home, the requirement is 140mm thickness of Thermo Hemp or Thermafleece EcoRoll, which is standard and up to 200mm thick (two layers of either product 100mm) for low energy homes. Thermo Hemp or Thermafleece EcoRoll insulation is not suitable for use in the cavity of block cavity walls. Internally, Thermo Hemp and Thermafleece EcoRoll Insulation is usually installed from 40mm to over 100mm thick between studs and from 100mm thick upwards between the floors for thermal/acoustic purposes.

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- How does Thermo Hemp and Thermafleece products compare with alternative materials?

Thermo Hemp and Thermafleece insulation have a very low conductivity. The lower the thermal conductivity the more difficult it is for heat to pass from one side to the other. To compare these products to other common insulators refer to the table below, here the conductivities are given in Watts per metre Kelvin (w/mK) – where the lower value is the better insulation value.

Insulation Material Conductivity (k Value)
Thermo Hemp 0.037 W/mK
Thermafleece Premium sheep wool 0.038W/mK

Thermafleece EcoRoll Blend mix sheep wool

0.039 W/mK
Glass Wool 0.044 W/mK
Mineral (Rock) Wool 0.042 W/mK
Cork 0.040 W/mK
Natural products are a significantly more effective insulator once moisture is introduced into an environment, which typically occurs in everyday situations. Your attic may have over 60% humidity for example, which will adversely affect materials which can not absorb this moisture. Natural insulation materials such as Hemp, woodfibre, sheep wool and cellulose are hygroscopic, which means they can absorb moisture without becoming wet to the touch and without affecting its superior performance.

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- How much insulation do I need?

The amount of insulation that you need will depend on the type of house, where you are insulating and if you have existing insulation in place.

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- Insulated Pitched Roofs

For roofline installations (dormer/cathedral ceilings where the insulation follows the roof shape) the requirement is 200mm (two layers of 100mm) to achieve the desired performance and comfort in new buildings. There are numerous other construction types, which we can calculate the amount of insulation you need, please contact us for more information.

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- What if I have glass/mineral fibre insulation installed already?

Most existing houses have at least some level of insulation in the attic. Many houses over 15 years will find that the depth of existing insulation is usually quite small as old glass/mineral fibre may settle over time and will be much less effective. There are two choices here: the existing fibre glass can be removed or one of our natural Insulation can be rolled out or poured over existing insulation. If you remove the existing insulation, be sure to take all the proper precautions including gloves, protective clothing and dust masks. There may also be an issue regarding the disposal of such insulations, and the manufacturer should be contacted for guidance concerning this. If you decide to roll our Insulation products over the existing insulation you will improve the U-Value of your house and you will also reduce the old insulation fibres from blowing around the attic space. Please see our products section for more details.

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- What is embodied energy?

Embodied energy is the energy required to produce the material and manufacture it to a building-grade insulation standard. It is typically measured in kiloWatt hours per cubic metre (kWh/m3). Our natural insulation products contain, much less energy than synthetic insulation, meaning that in a very short time, it will save more energy than will have gone into its production. Most common insulation materials will take many years to achieve this break-even point and some will never reach it at all. As hemp and wood absorb Carbon over their life cycle this sequesters the carbon content of the construction even before the material is installed!

Hemp, wood, wool and cellulose fibres are not harmful in any way. No protective clothing or equipment is required to handle or install our natural insulation products.

As is the case with synthetic insulation materials, electric wiring in the attic is best left on top of the insulation. This will allow easy access for electricians in the future and can avoid heavily loaded wires from overheating.

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- Why use natural insulation?

Thermo Hemp, Thermafleece sheep wool and natural insulation products provide effective thermal & sound insulation. They are easy to work with & can be readily cut to fit, but there are many other benefits, the most significant points being that natural insulation:

  • Improves the climate in your building because of its thermal & vapour diffusion capacity
  • Regulates temperature, absorbs moisture and can gently release moisture again
  • Protects the structure by keeping it dry, prolonging the lifetime of the building fabric
  • Its' density provides outstanding protection against overheating in the summer
  • In the roof space it absorbs daytime heat from the sun & only releases it later when temperatures are lower
  • Ideal for use between rafters, joists  with all our insulation products & timber studs Very effective fire resistance as they char rather than melt, self extinguishes and does not emit any noxious gases.

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-Do you deliver?

Yes. Depending on the quantity and products ordered, we deliver directly to your door. Delivery charges are minimal, and we endevour to delivery within 5 working days from receipt of payment.

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-Why should I insulate?

The main benefits of insulating your home are reducing heat loss and saving money on your heating bills. Insulation will also provide a more comfortable climate for your home, by acting as a buffer between the cold damp weather on the exterior and the warm dry environment inside your home.

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