U-Values
The thermal performance of roof & wall
constructions utilising Ashgrid has been calculated to take
into account the effects of two and three dimensional heat
flow by using computer software to model the Ashgrid system.
The table below details the depth of brackets required to
achieve the desired U-value.
U-Value Table
| |
U–value
W/m²K |
U–value
W/m²K |
WALLS
(mm) |
Vt. Cladding
(Bar &
bracket) |
Hz. Cladding
(Vertical
top hats) |
| Rock
Mineral Wool
l=0.040 W/mK |
0.20 |
220 |
- |
- |
| 0.25 |
180 |
180 |
180 |
| 0.35 |
- |
140 |
140 |
| Glass
Mineral Wool
l=0.044 W/mK |
0.20 |
240 |
- |
- |
| 0.25 |
190 |
190 |
200 |
| 0.35 |
- |
140 |
140 |
Notes
- Glass mineral wool l = 0.044
W/mK from previously 0.040 W/mK
- Rock mineral wool l = 0.040
W/mK from previously 0.037 W/mK
- All values include for insulation thickness and bracket
depth
- Ashgrid brackets assumed to be at 1m centres
- Purlin centres assumed to average out to 1.2m
- Rail centres assumed to average out to 1.0m
Click here for the Ash & Lacy U-Value Calculator |
