Legislation U-Value W/m2K

Schemes ActWall Roof

External Cavity Party Ceiling Pitched Flat

England

New BuildNotional 2010 BRegs Part L1A 0.18 0.13

Limiting 0.30 0.20 0.20

Existing

New & replaced 2010 BRegs Part L1B 0.28 0.16 0.18

Retained 0.30 0.55 0.16 0.18

Retained treshold 0.70 0.35

Wales

New BuildNotional 2014 BRegs Part L1A 0.18 0.13

Limiting 0.21 0.20 0.15

Existing

New & replaced 2014 BRegs Part L1B 0.21 0.15

Conversion&Renovation 0.30 0.55 0.16 0.18

Retained treshold 0.70 0.35

Scotland

New Build

NotionalTechnical Hardbook Section 6

0.19 0.20 0.13

Limiting (average) 0.25 0.18

Limiting (individual) 0.70 0.35

Existing

Extensions (Wall>0.70, Roof>0.25)

Technical Hardbook Section 6

0.19 0.13 0.15

Extensions (Wall<0.70, Roof<0.25)

0.22 0.15 0.18

Conversions (average) 0.30 0.25

Individual elements 0.70 0.35

BUILDING REGULATIONS

Building Regulations

Good pratice guidance

Building Regulations require thermal element within a building envelope to meet certain U-values. The target U-value depends on type of element, use of building and whether it is a new or an existing construction.

England, Wales ans Scotland are now each responsible for their own Building Regulations and target U-values can therefore differ throughout the UK. The above table gives a summary of requirements for domestic buildings at time of printing (October 2014). If required this information can be confirmed with your local Building Control.

The solutions provided may require an independent vapour control layer or breather membrane product to reduce the risk of interstitial condensation. Where a vapour control layer is required, a product with a vapour resistance Z>1100MNs/g should be used. Both vapour control layer and breather membrane need to be continuous and all joints sealed with adequate tape, to avoid air infiltration. To allow moist air to disperse into the atmosphere, the void between breather membrane and outer covering needs adequate ventilation. Please also refer to the installation guidelines.

FOR FURTHER ADVICE FROM ACTIS PLEASE CALL THE TECHNICAL DEPARTMENT  ON 01249 462 888.

TIMBER FRAME WALLS

HYBRIS as standalone

A 140mm deep timber frame stud wall is filled with 120mm HYBRIS. This solution achieves the U-Value of 0.27W/m2.K with a single insulation product.

300mm

0mm

120mmU-Value 0.27W/m²K

HYBRIS

PF19: Between 140mm studs: 120mm HYBRIS full fill

TIMBER FRAME WALLS

A 90mm deep timber frame stud wall is filled with HYBRIS, faced internally with HCONTROL-HYBRID, the vapour control layer, and externally with plywood sheathing and BOOST’R HYBRID, the vapour permeable membrane. A 50mm cavity separates the timber frame from the outer leaf, typically of brick.This solution achieves the required U-Value of 0.17W/m2.K using 90mm studs.

U-Value 0.17W/m²K

Combination of HYBRID products

PF22: Between 90mm studs: HCONTROL HYBRID + 45mm HYBRIS + BOOST’R HYBRID

HYBRIS 45mm0mm

300mm

HCONTROL HYBRID

BOOSTR HYBRID

PF23: Between 140mm studs: HCONTROL HYBRID + 90mm HYBRIS + BOOST’R HYBRID

U-Value 0.14W/m²K

HYBRIS 90mm0mm

300mm

HCONTROL HYBRID

BOOSTR HYBRID

PF24: Between 140mm studs: HCONTROL HYBRID + 105mm HYBRIS

PF39: Between 72mm studs: HCONTROL HYBRID

PF25: Between 72mm studs: HCONTROL HYBRID + BOOST’R HYBRID

U-Value 0.18W/m²K

U-Value 0.30W/m²K

U-Value 0.21W/m²K

HYBRIS 105mm0mm

300mm

HCONTROL HYBRID

HCONTROL HYBRID

HCONTROL HYBRID

BOOSTR HYBRID

TIMBER FRAME WALLS

PF26: Between 150mm studs: 120mm HYBRIS + BOOST’R HYBRID

PF45: Between 90mm studs: 45mm HYBRIS + HCONTROL HYBRID

PF46: Between 72mm studs: BOOST’R HYBRID + 50 foam board

U-Value 0.18W/m²K

U-Value 0.23W/m²K

HYBRIS

120mm0mm

300mm

BOOSTR HYBRID

BOOSTR HYBRID

TIMBER FRAME WALLS

U-Value 0.23W/m²K

HYBRIS 45mm0mm

300mm

HCONTROL HYBRID

Combination of hybrid products with other materials

SOLID WALLS

HCONTROL HYBRID as standalone

HCONTROL HYBRID insulation is installed on the internal side of a solid wall.

U-Value 0.30W/m²K

PF40: 2 x 38 x 38 battens HCONTROL HYBRID

HCONTROL HYBRID

PITCHED ROOFS

Combination of hybrid products

BOOST’R HYBRID is used as breather membrane, HYBRIS is filled between the rafters, HCONTROL-HYBRID is laid as vapour control layer. Internal finish is a standard plasterboard. This solution achieves the required U-Value of 0,18W/m2.K without losing space.

PF30: 600mm timber centers: HCONTROL HYBRID + 45mm HYBRIS + BOOST’R HYBRID

U-Value 0.18W/m²K

HYBRIS 45mm0mm

300mm

HCONTROL HYBRID

BOOSTR HYBRID

120mm0mm

300mm

PF43: : 600mm timber centers: HCONTROL HYBRID + 120mm HYBRIS + BOOST’R HYBRID

U-Value 0.13W/m²K

HYBRIS

HCONTROL HYBRID

BOOSTR HYBRID

PITCHED ROOFS

PF33: 600mm timber centers : 120mm HYBRIS + BOOST’R HYBRID

U-Value 0.18W/m²K

HYBRIS

120mm0mm

300mm

BOOSTR HYBRID

PF34: 600mm timber centers: HCONTROL HYBRID + 60mm foam board

U-Value 0.18W/m²K

HCONTROL HYBRID

PF31: 600mm timber centers: HCONTROL HYBRID + 90mm HYBRIS

U-Value 0.18W/m²K

HYBRIS 90mm0mm

300mm

HCONTROL HYBRID

PITCHED ROOFS

U-Value 0.18W/m²K

BOOSTR HYBRID

PF42: 600mm timber centers: BOOST’R HYBRID + 85mm foam board

PF35 : 400mm timber centers: HCONTROL HYBRID + 70mm foam board

U-Value 0.18W/m²K

HCONTROL HYBRID

LOFT INSULATION

Between and over joists

HYBRIS is installed between and over ceiling joists or on continuous solid floors. This solution achieves the required U-Value of 0.16W/m2.K with a single product in 2 layers.

300mm

300mm

0mm

0mm

195mm

240mm

U-Value 0.16W/m²K

U-Value 0.13W/m²K

HYBRIS

HYBRIS

PF37: 600mm timber centers 90mm HYBRIS + 105mm HYBRIS

PF44: 600mm timber centers 90mm HYBRIS + 150mm HYBRIS