This product is available as part of out Timber Frame Pack Download details

 

  
 
 
Calculations
 
Winter Condensation Risk Analysis (no account taken of thermal bridges)
TO BS5250
Internal RH 65.0%
External RH 95.0% 		NB Calculations are freely available from YBS: 01909 721 662
  Interface Temp (C) Dewpoint Temp. (C) Vapour Pressure (kPa) Saturated V.P. (kPa)
1 - Outside surface resistance 5.0 4.3 0.83 0.87
2 - Tiling 5.1 4.3 0.83 0.88
3 - Tile & Counter Battens 5.1 4.8 0.86 0.88
4 - T-F Roof Board Foil Bubble 5.4 4.8 0.86 0.89
5 - T-F Roof Board PUR GOLD 6.0 4.8 0.86 0.93
6 - Cavity 14.1 8.4 1.10 1.61
7 - Gyproc Wallboard 14.7 8.4 1.10 1.67
8 - Inside Surface Resistance 14.8
15.0		 8.5
8.5		 1.11
1.11		 1.69
1.70


Therma-Flect Roof Board – U-Value Calculation
Contact YBS Insulation Technical for further information

Construction
  Thickness (mm) Thermal Conductivity (W/mK)

Thermal Resistance
(n:²K/W)

Pitch & Bridge Details

Outside surface resistance – – 0.040 –
Tiling 10.00 – 0.012 –
Tile & Counter Battens 50.00 – 0.454 bridged by 11.1%
Timber (50.0mm)
T-F Roof Board Foil Bubble 4.00 – 0.125 –
T-F Roof Board PUR GOLD 115.00 0.023 5.000 bridged by 9.5%
Timber (100.0mm)
Cavity 35.00 – 0.350 bridged by 9.5%
Timber (50.0mm)
Gyproc Wallboard 12.50 0.210 0.060 –
Inside Surface Resistance – – 0.100 –
U-value, Combined method 0.2W/m:²K
(lower limit = 4.108m2K/W, upper limit = 5.190m:²K/W)
 
Construction Type
Element Pitched roof ceiling at rafter line
Exposure normal
Internal surface emissivity high
External surface emissivity high
 
achieves 0.2 U-Value through roof
Fully insulates and waterproofs in one application
No felt or vapour barrier required Meets: Part L1 & L2 andPart J
Major labour savings...
Boards can be pre-cut to fit 		Meets NHBC standards
High performance No special fixings required
 
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