Insulation for Partially Filled Cavity Walls

Rainscreen masonry.
Insulation for Partially Filled Cavity Walls

Application Overview

A partial fill cavity features thermal insulation secured to the inner steel or timber framing system or masonry inner leaf, leaving a cavity of air between the insulation and the masonry outer leaf.

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 properties, fire performance of insulation materials is a crucial consideration, when the building is to have high occupancy levels or have vulnerable occupants.

Our Mineral Wool insulation solutions provide the required thermal and fire performance and can be installed on buildings of any height.

RECOMMENDED PRODUCTS

WHY MINERAL WOOL?

  • Mineral Wool provides the best combination of thermal, fire safety and acoustic performance.

  • Compliance with reaction to fire classification requirements in Building Regulations without the need for system testing or desktop studies.

Typical U-values
FOR PARTIALLY FILLED MASONRY CAVITIES - NEW- USING ROCKSILK ® RAINSCREEN SLAB (BRICK OUTER LEAF / CAVITY / 100MM INNER LEAF AS DETAILED BELOW)

 

 

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

0.26

0.23

0.26

0.23

0.25

0.22

0.21

0.20

75

0.21

0.19

0.21

0.19

0.21

0.19

0.19

0.17

100

0.19

0.16

0.19

0.16

0.19

0.16

0.17

0.15

120

0.17

0.15

0.17

0.15

0.17

0.15

0.16

0.14

150

0.15

0.13

0.15

0.13

0.15

0.13

0.14

0.12

180

0.13

0.12

0.13

0.12

0.13

0.12

0.12

0.11

200

0.12

0.11

0.12

0.11

0.12

0.11

0.12

0.11

210

0.12

0.11

0.12

0.11

0.12

0.11

0.11

0.10

250

0.100.100.100.100.100.090.100.09

Note: 1.2mm Gauge SFS at 600mm centres, fully filled with OmniFit® Slab 35 (0.035W/mK). 12mm cementitious sheathing board and 2x15mm wallboard internal finish.

Rocksilk® Rainscreen Slab (0.034W/mK) installed with 50mm residual cavity using ACS 25/15 Framefix restraint system secured with stainless steel fixings. The above values are for guidance only, please contact our Technical Support Team direct for specific values.

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

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.