Timber Frame Wall Insulation

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Trade Range - Thermal Insulation For Timber Frame Walls

Timber frame construction is an efficient and flexible build method. Compared to traditional masonry, it can accommodate more timber frame insulation in between the wooden studs, as in a cavity. 

A continuous layer on the outside provides extra performance, while a layer on the inside gives additional room for electrical wiring. This helps create safe, efficient and positive living and working environments.     

Discover the applications, benefits and all the timber frame wall insulation details you need on this page.

Table of contents

  1. Why do we need timber frame insulation
  2. Calculator and savings
  3. Why choose ROCKWOOL solutions
  4. Case Studies
  5. Installation
  6. Downloads and resources
  7. Financial support
  8. FAQ
  9. Other relevant applications
Find inspiration, guides and reports

Timber Frame Insulation Products

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Slab Products

Timber Frame Slab

With an increased focus on compliance with thermal, fire and acoustic performance for external walls, ROCKWOOL Timber Frame Slab has been engineered with an optimal density offering a low thermal conductivity, exceptional resistance to fire and outstanding sound absorption. The non-combustible stone wool insulation has dimensions specifically designed to enable quick and easy installation into timber frames.

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Cavity Solutions

TCB Cavity Barrier

Cavity barriers work to improve a building’s safety by preventing the spread of fire within concealed voids. By specifying and installing the TCB Cavity Barrier or PWCB Cavity Barrier, they provide essential protection whilst also helping to minimise air leakage and heat loss between the external cavity and the separating party wall.

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Cavity Solutions

PWCB Cavity Barrier

Cavity barriers work to improve a building’s safety by preventing the spread of fire within concealed voids. By specifying and installing the TCB Cavity Barrier or PWCB Cavity Barrier, they provide essential protection whilst also helping to minimise air leakage and heat loss between the external cavity and the separating party wall.

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ROCKWOOL FLEXI®

ROCKWOOL FLEXI® has been designed as a multi-use, dual purpose acoustic and thermal stone wool insulation with a unique flexible edge along one side. It is suitable for use all over the home, in pitched roof rafters, framed external walls, internal partitions, intermediate floors, separating walls and floors, and timber suspended ground floors.

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Cavity Solutions

High Performance Partial Fill Cavity Slab

The ROCKWOOL High Performance Partial Fill Cavity Slab is a semi-rigid insulation solution designed for masonry cavity wall construction.

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Floor Solutions

Acoustic RockFloor®

With high-rise living and buildings with multiple-occupancy becoming increasingly common, acoustic performance of intermediate and separating floors is key in design criteria and specifications. Acoustic RockFloor® delivers robust impact sound protection.

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Floor Solutions

Thermal RockFloor®

Energy efficiency is becoming more of a focus, which means thermal performance of ground floors is key in sustainable design criteria and specifications. Thermal RockFloor® delivers energy efficiency and a comfortable indoor climate for building occupants.

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Roll Products

Twin Roll

ROCKWOOL Twin Roll is the ideal loft insulation solution for all building types and suspended ceilings. The mineral wool insulation is an all-around high specification option for thermal and acoustic performance, in addition to excellent fire resistance.

Why do we need timber frame insulation?

Timber frames filled with insulation generally offer better thermal performance than masonry walls of the same total thickness1. However, their reduced mass and wood properties mean they need the right material to provide strong fire protection and acoustic performance. ROCKWOOL timber frame wall insulation delivers excellent fire resilience and acoustic capabilities, alongside its thermal resistance qualities2.

Timber frame house insulation is well suited for use in timber frame buildings with its quick and easy fitting and dimensional stability. It will adjust to the small movements of the construction and stay in place for a lifetime. 

 

Benefits of ROCKWOOL products include:

  • Fire resilience
  • Sound absorption
  • Thermal resistance
  • Flexible application
  • Water repellent

 

Using mineral wool insulation, insulated external timber frame walls will typically provide better insulation performance than masonry walls of a similar thickness.

Source: https://mima.info/applications/walls/timber-frame-wall-insulation/

Relevant resources
Creating resilient timber frame buildings CPD
Book now
The ROCKWOOL Red Book
PDF
11.2 MB
Building Regulations
Learn more

Calculator and savings

The amount of insulation required will depend on the size and dimensions of the timber frame construction. With thermal requirements mostly determining the insulation thickness required, use a U-value calculator or contact our local technical team about the best product to use. 

In most cases, it will be a combination of full fill insulation between the wooden frame with a layer on the in or outside.

Use our ROCKWOOL U-Value calculator to determine the thermal performance of the building’s external walls.

Insulating a timber frame wall is a form of external/cavity wall insulation and could lead to savings of up to the following: 

Source: Energy Saving Trust 

Property type

Energy bill savings (£/year)

Detached

435

Semi-detached

260

Mid terrace

160

Bungalow

175

Flat

120

Learn about energy efficiency
Timber Frame Construction

Why choose ROCKWOOL solutions?

ROCKWOOL timber frame insulation delivers wider value than just thermal performance. The stone wool insulation is highly fire resilient – an ideal property when insulating around combustible wood. It also offers excellent sound absorption, reducing the impact of noise pollution in and outside of a property.3

The range of products include timber frame slabs and rolls to suit different frame dimensions and designs as well as the varying performance requirements. Each product is flexible for varying dimensions and comes with easy friction fitting.

Various features make ROCKWOOL products ideal insulation for timber frame construction. Using the seven strengths of stone they are:

  • Fire resilient
  • Water repellent
  • Sound absorbent
  • Thermal reductant
  • Robust
  • Cost-effective
Find ROCKWOOL products
The low carbon footprint of ROCKWOOL timber frame products is a perfect match with that of the wooden structure. The construction is easily dismantled at the end of its lifecycle, adding to the reduction of our environmental footprint.

Roger Peeters

ROCKWOOL Group Product Manager

Case studies

The problem

F. Socciarelli School in Italy required an efficient, safe and aesthetically pleasing extension. It needed to be sustainable, quick to build and meet the school’s green aims.

The solution

Using a laminated wood and ‘post and beam’ frame system, a façade was constructed with Rockpanel to reduce heat loss, energy consumption and allow breathability. The colours and wood complement the school’s design – and ROCKWOOL solutions are designed to prevent the spread of fire.

The results

F. Socciarelli School benefits from A4 energy performance – making the school nearly zero-energy efficient. Excellent safety and fire resilience add to the building’s success.

Find more case studies
Case Study, F. Socciarelli School
We have invested not only for the future but for the present of our children too. To give them a safe place to study, play and live is a matter of pride for us. The school has an excellent level of thermal and acoustic comfort. We also have to recognise that we completed the project in less than 100 days.

Francesco Subissati

Legal Representative at Subissati Srl

Installation

Installing timber frame wall insulation during construction or as prefabricated elements is the common method. It can sometimes also be retrofitted to existing properties. 

Key tips:

  • Choose insulation type – Pick an insulation product suited to the size and dimensions of the frame.
  • Build airtight – Apply an airtight vapour barrier on the inside of the construction to avoid thermal performance loss.
  • Weatherproof – Avoid insulation and the timber frame getting wet where possible, as this can lead to leaks before the insulation is installed.
Installation guides for professionals

Downloads and resources

To be updated
PDF
11.2 MB

The ROCKWOOL Red Book

Download
To be updated
PDF
3.1 MB

Timber Frame Slab Datasheet

Download
To be updated
PDF
1.8 MB

Thermal Timber Frame Slab Datasheet

Download

Download our guides

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Product Documentation

Approved Document L 2021 Edition (England)

Approved Document L (Part L) 2021 came into force in England on 15 June 2022, bringing big changes to thermal regulations for both new and existing buildings. Download our new guide.

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Product Documentation

The ROCKWOOL Red Book

To help save specifiers’ time and make it easier to identify the correct insulation solutions for facades, walls, floors and roofs, ROCKWOOL has launched the new ROCKWOOL Red Book – a fully interactive guide which provides digital access to technical data, product certification and a wide range of specification support materials.

Financial support

Check the Energy Savings Trust website to see whether there are any financial support schemes available for timber frame wall insulation.

Energy Efficiency, Key, Keyboard, Button

FAQs

What is the best insulation for a timber frame house?

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