Insulation helps to regulate the temperature within your home, ensuring a warm home in winter and a cool home during the summer months. A well-insulated and airtight home is an energy efficient home!


timber frame house insulation

1. Reduced Heating Bills

By reducing heat loss through air tightness and making your home more energy efficient, you will save up to 25% on your heating bills alone.

2. Building Reg Compliant  

Insulation is essential in order to meet the requirements of Part L (2011) and nZEB (Near Zero Energy Building).

3. Higher Re-Sale Value

A BER cert must now be provided with all homes for sale in the ROI. A higher BER achieves a better re-sale value.

4. Environmentally Friendly

By using less energy, your carbon footprint is reduced.

5. Improved Health

A warmer, cosier home with no damp or mould inevitably improved the health of its occupants.

6. Quick Payback

The payback on your home and wall insulation could be as little as 3 years!

Is a Timber Frame House Easier to Insulate?

Timber frame is both easier and cheaper to insulate and make airtight than any other method of construction.

With block, self-builders are having to full fill their cavity in order to achieve Part L/nZEB regulations. Even so, this typically also requires internal or external insulation in order to achieve maximum levels of efficiency – both of which can cause problems. Internal insulation in a block build could penetrate the seal of your air tightness membrane. It also negates the thermal conductivity of the block. On the other hand, external insulation means you have an insulated board as your external wall (no longer block!). If you choose only to fill the cavity, you have still compiled insulation in to an important element of the building – a breathable cavity is there for a reason!

As for other methods such as ICF, one Google search of “leaking ICF walls” retrieves thousands of articles outlining cause for concern – just ask your engineer! Albeit a great insulator, an ICF build is single skinned so essentially there is nothing stopping rainwater from penetrating the exterior layer and soaking through the porous block to your inner leaf.

With timber frame, should rainwater ever penetrate through the exterior leaf of block and past the breathable membrane, it will run down the cavity without ever touching your inner framework. Even if it did, the framework is VAC pressure treated with a further interior membrane and tapes protecting the integrity of the structure.


140mm Knauf Frametherm Stud Insulation

Knauf Frametherm Stud is a specialist glass mineral wool product designed for the insulation of timber frame houses. The insulation rolls are designed to be friction fitted between timber studs and rafters at 600mm and 400mm centres.

  • Euroclass A1 Fire Rated
  • ISO9001 Certified Product
  • Easy to Handle and Fit
  • Excellent Sound Absorption
external wall insulation Ireland
external insulation Ireland

140mm Xtratherm PIR Rigid Insulation Board

Xtratherm Thin-R is a quality rigid PIR insulation board suitable for application in the walls, floors and roof spaces of timber frame houses. This insulation surpasses the values required by current building regulations and is notoriously used in Zero Carbon Fabric and Passive House Standard timber frame homes.

  • Euroclass A1 Fire Rated
  • ISO9001 & NSAI Certified Product
  • High Performance Foil Face Polyiso (PIR) Insulation
  • Excellent Thermal Conductivity of 0.022 W/mK
  • R-Value of 6.82m2K/W
  • Engineered Jointing to Improve Thermal Bridging Performance

Additional Insulated Plasterboard

We can also supply and fit an additional 37mm Xtratherm insulated backed plasterboard and a 62.5mm Xtratherm Thin-R PIR insulated backed plasterboard. Insulated plasterboard is a combined product of insulation and plasterboard which is fitted as one panel, saving time and money. Insulated plasterboard also helps to reduce the effects of cold bridging and to provide for an extremely well insulated home. A typical timber frame house applying insulated plasterboard in addition to quality insulation in the framework achieves a Passive Standard u-value.

timber frame houses wall insulation

Sample Insulation Package 1 (U-Value 0.15)

140mm Frametherm Stud Insulation - Euroclass A1 Fire Rating

Airtightness Membrane and Tapes (to include Vapour Control Barrier)

50mm Xtratherm Thin-R PIR Rigid Insulation Board

50 x 35mm Counter Batten to Form Service Cavity

Plasterboard can then be applied following Electrics & Plumbing

Sample Insulation Package 2 (U-Value 0.11)

140mm Xtratherm PIR (Foil Backed) Rigid Insulation Board

Airtightness Membrane and Tapes (to include Vapour Control Barrier)

50mm Xtratherm Thin-R PIR Rigid Insulation Board

50 x 35mm Counter Batten to Form Service Cavity

Plasterboard can then be applied following Electrics & Plumbing

Please note: We are not restricted to the above Insulation Packages. We can customise your quotation in order to cater for any insulation type or additional specifications as outlined in your Preliminary BER. For example, a 225mm x 44mm frame with 225mm plus of insulation.


We supply and fit Knauf Acoustic Earthwool Roll insulation which is available in a variety of lengths, widths and thicknesses. Typically clients choose 50-150mm acoustic insulation to their internal walls and 100-200mm at first floor level. This can be tailored to suit your needs and the depth of your chosen framework.

  • Excellent acoustic performance
  • Fire resistant in walls and roof spaces
  • Vapour permeable breathable insulation
  • Improves energy efficiency
  • Reduces heating & cooling costs
  • Ready cut to suit 400mm centres
acoustic internal wall insulation timber frame


Air naturally moves from warm areas to colder spots, and so insulation restricts this naturally movement. During the colder months, insulation prevents cold from entering the house (mainly through the walls and roof), and in the summer it works to keep the cool air inside by blocking it from moving towards the warmer outside air.

How Is Insulation Measured? (The ‘R-Value’)

Insulation is measured by its resistance to heat flow, otherwise known as an R-value. The higher the R-value, the more blocking capability or insulating properties it provides. The thickness of insulation, where it’s applied and how well it is fitted will all determine the total R-value.

How Much Insulation Should I Use?

The simply answer is - as much as possible. It’s not really possible to “over-insulate” your home, in fact the more the better! However, there is a point of diminishing returns where the insulation costs more than the improvement in heat retention in terms of energy savings.

Where Is Insulation Most Important?

Insulation should be applied between any barrier that stand between cold and warm air or heated and unheated spaces. The most important area to insulate heavily is the walls (40% of heat lost), followed by the roof (25%), the windows and doors (20%) and lastly the floor.

How Much Money Can I Save?

The amount of money saved by insulating your home depends on a number of factors – the type of insulation, size of the house, type and quality of the windows and the steps taken to achieve air tightness. In most cases, the investment on insulation is quickly recuperated.

Ask the Experts!

Our team are experts in the insulation of timber frame houses. For more information on insulating a timber frame house, feel free to get in touch with our team at info@timberframeireland.com.

Quick Quote?

Simply email your plans to info@timberframeireland.com for a free, detailed quotation of your timber frame house.

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