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SBEM - Commercial Premises EPC - Required for Residential Homes Architects Information

SAPS CALCULATIONS

 
 

U-VALUE - FLAT ROOFS

The tables below provide a quick and easy reference guide to the thickness
of insulation required to meet the stated U-values for roofs.

 

 

Construction
Timber Deck - Roof finish, Insulation, Vapour check bituminous,
Sheathing board, Joists, Plasterboard based on 150mm joists @400mm Centres.

Concrete Deck - Roof finish, Insulation, Vapour Control Layer,
100mm Dense precast concrete, with suspended ceiling.

Metal Deck - Roof finish, Insulation, Vapour barrier, Aluminium.
 

Partially Bonded Built Up Felt Roof
 
U-Value 0.25 & 0.20
MANUFACTURER
PRODUCT
LAMBDA
λ
TIMBER
DECK
CONCRETE
DECK
METAL
DECK
Thickness MM
0.25
0.20
Thickness MM
0.25
0.20
Thickness MM
0.25
0.20
CELOTEX
TUFF-R ™ DECK TD3000 (TD3080)
0.023
80
-
-
-
-
-
CELOTEX
ENERGY-LOK EL3
0.026 - 0.025
90
120
100
125
100
125
ECOTHERM
BARRIER MP (ZERO ODP)
0.027
90
120
100
130
105
130
KINGSPAN
THERMAPITCH TP10 ZERO ODP
0.028
95
120
95
130
100
130
KINGSPAN
KOOLTHERM KS ROOFBOARD
0.022 - 0.021
75
90
80
100
85
100
ROCKWOOL
DUO ROCK
0.038
130
170
-
-
# 140
# 180
† 130
† 170
145
185
-
-
ROCKWOOL
HARD ROCK DD
0.039
135
170
-
-
# 145
# 180
† 135
† 170
150
190
-
-
# Concrete 150mm - 13mm Plaster Ceiling
† Concrete 150mm - Plasterboard & Timber Batten Ceiling
 

Fully Bonded Built Up Felt & Mastic Asphalt
 
U-Value 0.25 & 0.20
MANUFACTURER
PRODUCT
LAMBDA
λ
TIMBER
DECK
CONCRETE
DECK
METAL
DECK
 
Thickness MM
0.25
0.20
Thickness MM
0.25
0.20
Thickness MM
0.25
0.20
ECOTHERM
BARRIER M.P. (ZERO ODP)
0.027
90
110
100
130
105
130
KINGSPAN
THERMAROOF TR22 ZERO ODP
0.026
80+20*
80+20*
80+20*
80+20*
85+20*
80+20*
KINGSPAN
THERMAROOF TR21 ZERO ODP
0.027
-
25
-
30
-
30
ROCKWOOL
HARDROCK DD
0.039
135
170
# 145
# 180
† 135
† 170
150
190
VENCEL RESIL
DUO ROCK
0.036
110+20*
155+20*
110+20*
165+20*
120+20*
165+20*
VENCEL RESIL
HARD ROCK DD
0.036
120
155
135
170
135
170
*Cork thickness
# Concrete 150mm - 13mm Plaster Ceiling
†Concrete 150mm - Plasterboard & Timber Batten Ceiling
 

Single Ply Membrane (Mechanically Fixed)
 
U-Value 0.25 & 0.20
MANUFACTURER
PRODUCT
LAMBDA
λ
TIMBER
DECK
CONCRETE
DECK
METAL
DECK
Thickness MM
0.25
0.20
Thickness MM
0.25
0.20
Thickness MM
0.25
0.20
CELOTEX
ENERGY-LOK EL3
0.026-0.025
100
120
100*
120*
100
120
DOW
ROOFMATE RL-X
0.029
120
160
120
160
120
160
ECOTHERM
SELTHAAN FOIL SL (ZERO ODP)
0.023
90
110
90
110
90
110
KINGSPAN
THERMAROOF TR26 ZERO ODP
0.023
90
100
90
110
95
110
KINGSPAN
KOOLTHERM K1 ROOFBOARD
0.022-0.021
85
100
85
100
95
100
ROCKWOOL
DUO ROCK
0.038
130
170
-
-
# 140
# 180
† 130
† 170
145
185
-
-
ROCKWOOL
HARDROCK DD
0.039
135
170
# 145
# 180
† 135
† 170
150
190
VENCEL RESIL
JABROOF BOARD
Grad 150 (for increased density)
0.036
(0.035)
120
155
135
170
135
170
*Concrete 250mm
# Concrete 150mm - 13mm Plaster Ceiling
†Concrete 150mm - Plasterboard & Timber Batten Ceiling
 

Single Ply Membrane (Fully Adhered)
 
U-Value 0.25 & 0.20
MANUFACTURER
PRODUCT
LAMBDA
λ
TIMBER
DECK
CONCRETE
DECK
METAL
DECK
Thickness MM
0.25
0.20
Thickness MM
0.25
0.20
Thickness MM
0.25
0.20
CELOTEX
ENERGY-LOK EL3
0.026-0.025
95
120
100
125
100
120
CELOTEX
TUFF-R DECK TD3000 (TD3080)
0.023
80
-
-
-
-
-
ECOTHERM
BARRIER SL (ZERO ODP)
0.027
100
120
100
130
105
130
KINGSPAN
THERMAROOF TR27 ZERO ODP
0.027-0.026
*100
120
90
130
100
130
KINGSPAN
KOOLTHERM K2 ROOFBOARD
0.022-0.021
*80
100
80
100
85
100
ROCKWOOL
DUO ROCK
0.038
130
170
# 140
# 180
† 130
† 170
145
185
-
-
ROCKWOOL
HARDROCK DD
0.039
135
170
# 145
# 180
† 135
† 170
150
190
-
-
# Concrete 150mm - 13mm Plaster Ceiling
†Concrete 150mm - Plasterboard & Timber Batten Ceiling
*TR27 - with suspended ceiling 90mm = 0.25 U-Value K2 with suspended ceiling 75mm = 0.25 U-Value
 
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