Insulating Timber Frame Walls



An insulated wall is a thermally secured, protective, external cladding structure that involves and makes use of insulating systems to protect and maintain a comfortable internal environment. These systems canmultifoil insulation used in a timber framed wall come in many forms depending on the type of wall in question. Timber frame walls are among the most forgiving for the addition of insulation, which is installed between the studs. Multifoil insulationcan then be fitted to the front face of the timber studs, just before the plasterboard.  Inarguably, timber framing is one of the oldest forms of wall construction and one of the easiest to maintain.

Apart from the warmth timber frames add to your house's design, the cost-effectiveness of using timber frames makes it a good choice for most homeowners.

Consider multifoil insulation:

The use of PIR board or mineral wool between the studs provides an effective thermal benefit, but these materials will not meet building regulations on their own. To ensure a comfortable internal environment and to prevent the risk of condensation, you may wish to consider the addition of a multifoil insulation on the front face of the wall just behind the plasterboard. Multifoils also act as a vapour barrier to prevent moisture entering the wall space from the inside of the building. This minimizes the risk of condensation whilst also providing a thermal energy saving.

Timber Wall Frame Insulation Construction Checklist

1. Plasterboard

2. Battens to create a service cavity (optional)

3. Insulation across the front studs (optional)

4. Vapour control layer

5. Timber studs containing insulation

Benefits of TLX Silver multifoil insulation:

Reduces Energy Consumption: Upon installation, you'll enjoy maximum energy efficiency in your home. It can achieve very low U values, especially when used as part of a hybrid system with additional insulation such as mineral wool or PIR board, which translates into less loss of heat. As a result of this it will cost less to heat your home.

Ease of Installation:

TLX Silver is installed by simply rolling it our across the front face of the timber studs and securing it in place with battens. Additional insulation such as mineral wool or PIR board can be fitted in-between the studs.

The Importance of Air gaps for the reflection of heat

The air gaps within the structure store radiant heat, with the help of the reflective outer layers of TLX Silver. Without the air gap, there won't be efficiency in the wall buildup and this will result in a lesser thermally efficient wall.

‘Can we have too much radiant heat?’

Multifoil’s control all three forms of heat transfer, convection, conduction, and radiation. The outermost layers have low emissivity surfaces. These reflect both infrared radiation back into the house and prevent the house from emitting radiation to the outside, keeping your building cool in summer and warm in winter.


Insulating walls can be used to serve many purposes from helping to maintain a comfortable internal temperature to soundproofing. Wall Insulation provides cool comfort and protection against heat, it is energy-efficient and really saves the cost of air conditioning and electricity wastage.

But like all things, insulation systems tend to have problems or disadvantages, some minor, yet some major, that come with them which can be very damaging to your home.  

Let's take a look at the problems associated with this and how multifoil insulation can help to minimize them:

This is a major problem plaguing timber frame walls because of the porous nature of timber. Installation of PIR board and mineral wool can be tricky, therefore, with the best will in the world some people may not properly fit the insulation in place. Improper installation can cause leakage, leading to damp, moist conditions. Installing multifoil wall insulation effectively manages the risk of condensation with its shiny, reflective layers that keep heat and moisture inside the building, ensuring no risk of condensation.

For a fully effective insulating system, airtightness is key. Therefore, if using a material such as PIR board in-between the studs alone, any gaps around the edges will result in a structure that is not fully airtight. However, the addition of TLX Silver provides a completely airtight barrier against moisture, preventing condensation.

Insulating walls has a lot of benefits not just for the home, but also in studios and churches, etc. where loud noises are a constant daily factor. They provide comfort, efficiency and are energy efficient, superb in reducing noise pollution and you also save on electricity bills.

multifoil insulation used in a timber framed wallHow to install TLX Silver in a Timber frame wall:

TLX Silver is installed across the front face of the timber studs, providing both thermal resistance and a vapour barrier.

38x38mm battens secure the material to the studs. Setting them cross-wise will minimize thermal bridging and help towards achieving the optimal U value for the structure. Battens also provide a cavity for services. A wall structure with TLX Silver fitted in this way has no risk of surface or interstitial condensation.

A breather membrane on the outside of the sheathing board ensures the frame is watertight. This membrane can be a standard or a reflective, low emissivity product.

Opting for multifoil wall insulation helps with vapour control, effectively manages condensation risk and provides thermal insulation within the building it occupies. Meeting U value requirements can seem like tricky business, but with our helpful team of product scientists, TLX has the answers. Please don’t hesitate to contact us for advice on 01204 674 730.

Further reading related to this topic can be found HERE

We have also written a case study based on this topic which can be found HERE

tlx insulation