YBS Insulation - Therma-Flect Roof Board

Products Overview |

Roof | Therma-Flect Roof Board

EPS SILVER & PUR GOLD Pre cut roof insulation which meets building regulations and waterproofs all in one layer

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

Can achieve 0.16 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