Thermal Kit Specification - Rural Homes

  5* Closed 4* Closed 3* Closed 3* Open 2* Closed 2* Open 1* Open
Ground Floor - by others
Insulated Concrete Ground Floor
Designed / Supplied by others

See Assumed Insulation Thickness 180mm PU 150mm PU 120mm PU 120mm PU 100mm PU 100mm PU 90mm PU
U Value W/m2K (below slab) 0.10 0.12 0.15 0.15 0.17 0.17 0.18
External Walls              
Breather Membrane Reflective Reflective Reflective Reflective Reflective Reflective Reflective
OBS Sheathing 9mm 9mm 9mm 9mm 9mm 9mm 9mm
Framing 235mm 184mm 140mm 140mm 90mm 140mm 140mm
Insulation 235mm PU 184mm PU 140mm PU 140mm Frametherm 32 90mm PU 140mm Frametherm 35 140mm Frametherm 35
OSB Sheathing 9mm 9mm 9mm Not applicable 9mm Not applicable Not applicable
Vapour Control Layer Reflective Reflective Reflective Polythene Reflective Reflective Not applicable
PU Layer - -   25mm - - -
Service Void / Battens 35mm 35mm 35mm 35mm 35mm 35mm Not applicable
Plasterboard 15mm TE Plain 15mm TE Plain 15mm TE Plain 15mm TE Plain 15mm TE Plain 15mm TE Plain 15mm TE vapoursheld
U Value W/m2K 0.11 0.13 0.15 0.15 0.21 0.20 0.22
Roof -Horizontal Ceiling              
Insulation 560mm Frametherm 35 560mm Frametherm 40 420mm Frametherm 40 420mm Frametherm 40 370mm Frametherm 40 370mm Frametherm 40 280mm Frametherm 40
U Value W/m2K 0.07 0.08 0.10 0.10 0.13 0.13 0.15
Roof -Coomb/Sloping              
Insulation
200mm PU 170mm PU 170mm PU 170mm PU 140mm PU 140mm PU 140mm PU
Vapour Control Layer Polythene Polythene Polythene Polythene Polythene Polythene Polythene
PU Layer 25 25 25 25 25 25 25
Service Void / Battens 35 35 35 35 35 35 35
Plasterboard 15mm TE Plain 15mm TE Plain 15mm TE Plain 15mm TE Plain 15mm TE Plain 15mm TE Plain 15mm TE Plain
U Value W/m2K 0.12 0.13 0.13 0.13 0.15 0.15 0.15
Roof -Hanging post              
Insulation 140mm PU 120mm PU 140mm Frametherm 35 140mm Frametherm 35 140mm Frametherm 32 140mm Frametherm 32 140mm Frametherm 40
Vapour control layer Polythene Polythene Polythene Polythene Reflective Reflective Reflective
PU Layer 25 25 25 25 - - -
Service Void / Battens 35 35 35 35 35 35 35
Plasterboard 15mm TE Plain 15mm TE Plain 15mm TE Plain 15mm TE Plain 15mm TE Plain 15mm TE Plain 15mm TE Plain
U' Value W/m2K 0.14 0.15 0.17 0.17 0.20 0.20 0.22
External Joinery - W/m2K              
Windows (whole product) 0.80 1.00 1.20 1.20 1.40 1.40 1.60
Roof Lights 1.15 1.30 1.30 1.30 1.50 1.50 1.60
External Doorsets (average product) 0.80 1.00 1.20 1.20 1.40 1.50 1.60

 

Our 1 star option is the basic specification that is required to comply with national building regulations. Where open panel options are concerned, we would like to highlight that you should allow for additional site labour costs for the fitting of insulation/service void materials.

 

Val-U-Therm

Each element of the building envelope - wall, roof, floor, windows and external doors has a role to play in minimising heat loss. The insulating effect of each of these elements is measured by its U value - the lower the U value, the better its thermal performance.

 

Because Val-U-Therm® provides such a high level of insulation it reduces the need to install costly renewable energy systems (Photovoltaic/ solar thermal panels, heat pumps etc).

What's more, an investment in Val-U-Therm® wall, floor and roof panels will last for the life of the building - unlike renewables that need to be controlled, require frequent maintenance and, often, wholesale replacement during the lifetime of a property. In contrast, the Val-U-Therm® system is a Fit and Forget, Fabric First solution.

Building towards greater energy conservation

All new buildings must now reach increasingly higher standards of energy conservation. The Scottish Building Standards and the Approved Documents Part L of the English Building Regulations are driving the reduction of carbon emissions in new buildings.

Building in timber frame makes it easy to achieve a high performance building fabric that maximises thermal performance and minimises unwanted air leakage commonly known as draughts.

It should be noted that both the Scottish Building Standards and the Approved Documents Part L of the English Building Regulations are the minimum required to comply, with the regulations being amended on average every three years imposing ever more stringent requirements of energy conservation it makes sense to consider 'future proofing' your home by building to a better thermal standard now.

Scottish Building Regulations - Section 6

For nearly fifty years, Scotland has had its own set of Building Regulations. For many years the energy standards in the regulations were set at a modest level, broadly following those that existed in the remainder of the UK. As we moved into the 21st century and the climate change agenda gathered momentum, the energy standards now incorporate the best levels of thermal insulation in the UK, reflecting Scotland's colder climate.

The standards introduced at the start of October 2015 reduce the CO² emissions from new buildings by a further 21.4% from the 2010 Regulations. These standards are comparable with the best in Europe.

All things being equal, the new Scottish Building Regulations will reduce CO² emissions from new buildings by around 45% when compared to the 2007 standards.

English Building Regulations - Part L

Part L of the Building Regulations requires that throughout the building process, greater attention be paid to every factor that contributes to the energy consumption or heat loss of a building.

As this Regulation now requires a 'whole house' approach to demonstrating compliance, developers are required to meet an overall energy performance target. There is also a greater emphasis on ensuring that the building construction meets the standards assumed at the design stage and that the heating and hot water systems are correctly commissioned.

The energy efficiency standards in Approved Document Part L were further strengthened in the 2010 amendments, requiring a 25% decrease in target CO² emissions and lower levels of unwanted air-leakage, the high thermal performance provided by using timber frame in the building fabric makes the new targets easily achievable.

Thermal performance

Timber frame has the advantage over masonry construction as the insulation is incorporated within the timber frame panels as opposed to being fitted in the area that was traditionally the cavity in masonry construction, this results in the timber frame construction achieving a higher level of thermal performance in a 'thinner' wall thereby negating the need for increased foundation and underbuilding costs as is the case with masonry construction.




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