Building Regulations for Roof Insulation
Roof insulation thickness for building regulations will vary depending on the type of insulation used. Used within a Bauder waterproofing system our products meet current UK Building Regulations Part B for fire protection.
Different insulants have different efficiencies and performance levels which affects the thickness required to meet building regulations. This table shows a comparison of the insulations when looking to achieve different U-values on a plywood deck.
Warm roof insulations
| |
0.11W/m²K on a plywood deck |
0.13W/m²K on a plywood deck |
0.18W/m²K on a plywood deck |
| Insulation Type |
Thickness
(mm) |
Approx Weight Loading
(Kg/m²) |
Thickness
(mm) |
Approx Weight Loading
(Kg/m²) |
Thickness
(mm) |
Approx Weight Loading
(Kg/m²) |
| BauderPIR FA-TE |
200 |
6 |
160 |
4.8 |
120 |
3.6 |
| BauderPIR FA |
200 |
6 |
160 |
4.8 |
120 |
3.6 |
| BauderPIR FA G16 (average thickness) |
200 |
6 |
160 |
4.8 |
120 |
3.6 |
| BauderVIP TE* |
110 |
17.9 |
80 |
17 |
60 |
13 |
| BauderROCK |
335 |
53.6 |
290 |
46.4 |
200 |
32 |
| BauderGLAS |
310 |
31 |
260 |
26 |
190 |
19 |
*U-value based upon ratio of 80% BauderVIP TE in combination with 20% BauderPIR FA-TE with an additional 30mm layer of BauderPIR FA-TE for 0.11
W/m²
K
Inverted roof insulation
Key:
*1 layer
** 2 layers
*** 3 layers
BauderGLAS Inverted incudes a base layer of BauderGLAS T3+
Excluding correction in BS6229:2018 - 4.6.2.2 Inverted Roofs
| |
0.11W/m2K on a 150mm concrete deck with a lambda value of 2.500 W/mK |
0.13 W/m2K on a concrete deck with a lambda value of 2.500 W/mK |
0.18 W/m2K on a concrete deck with a lambda value of 2.500 W/mK |
| Insulation Type |
Thickness
(mm) |
Approx Weight Loading
(Kg/m²) |
Thickness
(mm) |
Approx Weight Loading
(Kg/m²) |
Thickness
(mm) |
Approx Weight Loading
(Kg/m²) |
| BauderJFRI PREMIUM+ Hard Landscape |
265** |
7.95 |
225** |
6.75 |
165* |
4.95 |
| BauderJFRI PREMIUM+ Soft Landscape |
280** |
8.40 |
240* |
7.20 |
175* |
5.25 |
| BauderJFRI PREMIUM 300 Hard Landscape |
280** |
11.20 |
240* |
9.60 |
175* |
7.00 |
| BauderJFRI PREMIUM 300 Soft Landscape |
300** |
12.00 |
255** |
10.20 |
185* |
7.40 |
| BauderXPS 300 |
310*** |
9.30 |
260*** |
7.80 |
190** |
5.70 |
| BauderGLAS Inverted |
360** |
36.00 |
300** |
30.00 |
220** |
22.00 |
Including correction in BS6229:2018 - 4.6.2.2 Inverted Roofs
| |
0.11W/m2K on a concrete deck with a lambda value of 2.500 W/mK |
0.13 W/m2K on a concrete deck with a lambda value of 2.500 W/mK |
0.18 W/m2K on a concrete deck with a lambda value of 2.500 W/mK |
| Insulation Type |
Thickness
(mm) |
Approx Weight Loading
(Kg/m²) |
Thickness
(mm) |
Approx Weight Loading
(Kg/m²) |
Thickness
(mm) |
Approx Weight Loading
(Kg/m²) |
| BauderJFRI PREMIUM+ Hard Landscape |
290** |
8.70 |
250** |
7.50 |
180* |
5.40 |
| BauderJFRI PREMIUM+ Soft Landscape |
310** |
9.30 |
265** |
7.95 |
190* |
5.70 |
| BauderJFRI PREMIUM 300 Hard Landscape |
310** |
12.40 |
265** |
10.60 |
190* |
7.60 |
| BauderJFRI PREMIUM 300 Soft Landscape |
330** |
13.20 |
280** |
11.20 |
200* |
8.00 |
| BauderXPS 300 |
340*** |
10.20 |
290*** |
8.70 |
210** |
6.30 |
| BauderGLAS Inverted |
n/a |
n/a |
320** |
32.00 |
230** |
23.00 |
England and Wales - Part L of Building Regulations - Convservation of fuel and power
Separate criteria are set out in approved documents;
L1 is specific to dwellings and
L2 relates to buldings other than dwellings. These are then split into four sections and for new construction are based on notional buildings:
L1A New Dwellings - 0.13 W/m²K
L1B Existing Dwellings - 0.18 W/m²K
L2A New Buildings other than Dwellings - 0.18 W/m²K
L2B Existing Buildings other than Dwellings - 0.18 W/m²K
More via
Government Planning Portal ►
Scotland - Section 6 of the Scottish Building Regulations - Energy
Revised target levels for roofs are to be implemented from October 2015 and are approaching or exceeding the passiivhaus standard for buildings.
Domestic buildings - 0.11 W/m²K
Non Domestic buildings - 0.18 W/m²K for heated and naturally vented notional buildings
Non Domestic buildings - 0.16 W/m²K for heated and mechanically vented notional buildings
More via
The Scottish Government ►
Contact us today about your project
To learn more about building regulations or if you'd like to discuss your flat roof project,
get in touch to arrange a meeting with your local area technical manager.