Check Part L building compliance

Alpha This is a new service - your feedback will help us to improve it.

External wall

Provide a name for this element so that it can be identified later
Pitch

Guidance (opens in another window)

Tilt angle of the surface from horizontal, between 0 and 180, where 0 means the external surface is facing up, 90 means the external surface is vertical and 180 means the external surface is facing down

180 = floors
0 = ceilings

Help with this input
Orientation measurement

To define an object's orientation, measure the angle of its outside face clockwise from true North, accurate to the nearest degree.

If a wall has multiple orientations (i.e a hexagonal wall) each different orientation needs to be modelled separately

The height of the building element
The length of the building element
The distance between the ground and the lowest edge of the element
Net area of the opaque building element (i.e. area of all windows / doors should be subtracted before entry). If the element is not square or rectangular the area might not be equal to width x height, hence the need to ask for area in addition to width and height.
Solar absorption coefficient at the external surface (dimensionless), the proportion of solar radiation which is absorbed. Decimal between 0-1.
Help with this input

0.3
Light colour

0.6
Intermediate colour

0.9
Dark colour

Steady-state thermal transmittance of the building element
Areal heat capacity
Effective areal heat capacity or kappa value. This is the total heat capacity of all the construction layers, that is, the sum of the heat capacities of each individual layers.
Help with this input
Very lightLight board or plastic
Light5-10 cm lightweight brick or concrete
Medium10-20 cm lightweight brick or concrete
Heavy7-12 cm solid brick or heavyweight concrete
Very heavyMore than 12 cm solid brick or heavyweight concrete
Mass distribution class
Distribution of mass in building element
Guidance (opens in another window)
Construction with external thermal insulation (main mass component near inside surface), or equivalent
Construction with internal thermal insulation (main mass component near outside surface), or equivalent
Construction with thermal insulation in between two main mass components, or equivalent
Uninsulated construction (e.g. solid or hollow bricks, heavy or lightweight concrete, or lightweight construction with negligible mass (e.g. steel sandwich panel), or equivalent
Construction with both internal and external insulation (main mass component concentrated near centre of construction), or equivalent