Insulation for Partial Fill Cavity Walls

Rainscreen masonry.
Insulation for Partial Fill Cavity Walls

Using a steel frame inner leaf and masonry outer leaf

Application Overview

A partial fill cavity features thermal insulation secured back to the inner SFS frame, leaving a cavity of air between the insulation and the masonry outer leaf, and can be used on buildings of any height.

The cavity between the insulation and the outer leaf performs as a barrier to external moisture, preventing it from tracking to the inner construction.

In addition to thermal performance, fire performance of insulation materials is a crucial consideration, particularly when designing buildings over 18m in height or when the building is to have high occupancy levels or be used by vulnerable occupants.

RECOMMENDED PRODUCTS

WHY MINERAL WOOL?

  • Non-combustible, being suitable for use on all buildings including those above 18m in height providing compliance with fire related building regulations.

  • Contributes to building regulation compliance without reliance on separate testing or desktop studies.

Download our Installation Guide                     Download our BBA Certification                       

Typical U-values
Using Earthwool RainScreen Slab

 

 

102.5mm Brick Outer Leaf

K=0.770

102.5mm Brick Outer Leaf

K=0.770

100mm Dense Block Outer Leaf

K=1.210

100mm Dense Block Outer Leaf

K=1.210

100mm Medium Block Outer Leaf

K=0.510

100mm Medium Block Outer Lea

K=0.510

100mm Aircrete Block Outer Leaf

K=0.150

100mm Aircrete Block Outer Leaf
 

K=0.150

Rainscreen Slab (mm)

100mm SFS

150mm SFS

100mm SFS

150mm SFS

100mm SFS

150mm SFS

100mm SFS

150mm SFS

50

0.27

0.23

0.27

0.23

0.26

0.22

0.23

0.20

75

0.22

0.19

0.22

0.20

0.22

0.19

0.20

0.18

100

0.19

0.17

0.19

0.17

0.19

0.17

0.18

0.16

120

0.17

0.15

0.17

0.15

0.17

0.15

0.16

0.14

150

0.15

0.13

0.15

0.14

0.15

0.13

0.14

0.13

180

0.13

0.12

0.13

0.12

0.13

0.12

0.13

0.11

200

0.16

0.14

0.16

0.14

0.16

0.14

0.15

0.13

210

0.16

0.14

0.16

0.14

0.15

0.13

0.15

0.13

NOTE: 1.2mm Gauge SFS at 600mm centers, fully filled with Earthwool OmniFit Slab (0.035 W/mK). 2x15mm Standard wallboard internal finish. Earthwool Rainscreen Slab installed with 50mm residual cavityusing using Ancon 25/14 restraint system. Ancon tube (compression sleeves) installed >180mm which is reflected in the calculations.

The above values are for guidance only, please contact our Technical Service Team direct for specific values – all of our calculations for Rainscreen Facade Systems are carried out to BS EN 10211 using compliant software.

Contact our Technical Support Team

We provide FREE 3D U-value calculations for rainscreen façade systems Contact our Technical Support Team for details on 01744 766 666 or technical.uk@knaufinsulation.com

Did you know...

That we have a CPD dedicated to rainscreen façade systems?

Find out more           or  Book your CPD today

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For any U-value calculations for alternative construction build-ups, please contact our Technical Support Team on 01744 766666.
For written U-value calculations, please complete our contact form by clicking here, including details of your full through construction build-up and we will respond accordingly to meet your requirements.
We are a fully accredited member of the industry leading British Board of Agrément (BBA) U-value and Condensation Calculation Competency Scheme which promotes and assists accurate, objective and consistent calculations of U-values and condensation calculations within the UK construction industry. As part of our ongoing participation in the scheme, we are required to maintain written records for audit trail purposes.