INSULATION AND BUILDING REGULATIONS
For Renovations and Extensions
ENGLAND & WALES
INDEX Pitched Roofs SuperFOIL Pitched Roof (Internal) 1-2 SuperFOIL Pitched Roof (External) 3-4 Actis Pitched Roof - Refurb Options to achieve 0.15 5 Actis Pitched Roof - New Product to achieve 0.16 6 TLX Build Up Options 7-8 Insulation for Pitched Extension - 0.15 9-10 Insulation for Pitched Roof Renovation - 0.16 11-12 EcoTherm U-Value Calculator and Condensation Risk Assessment - non-ventilated 0.15 13-15 EcoTherm U-Value Calculator and Condensation Risk Assessment - ventilated 0.15 16-18 EcoTherm U-Value Calculator and Condensation Risk Assessment - non-ventilated 0.16 19-21 EcoTherm U-Value Calculator and Condensation Risk Assessment - ventilated 0.16 22-24 TLX Gold - 0.33 and 0.69 25 Flat Roofs SuperFOIL Flat Roof (Warm/Hybrid) 27 SuperFOIL Flat Roof (Cold) 28 Actis Cold Flat Roof to achieve 0.16 29 Insulation for Flat Extension 0.15 30 Insulation for Flat renovation 0.16 30 Insulation for Cold Flat Roof Renovation 0.16 30 EcoTherm Bonded 0.15 31-34 EcoTherm Bonded 0.16 35-38 TLX Gold - 0.33 and 0.69 39 Insulation and building regulations - England
Pitched Roofs SuperFOIL Pitched Roof (Internal) 42 SuperFOIL Pitched Roof (External) 43-44 Actis Pitched Roof to achieve 0.13 45 TLX Build Up Options 46 Insulation for Pitched Extension - 0.13 47-48 Insulation for Pitched Renovation - 0.13 47-48 EcoTherm U-Value Calculator and Condensation Risk Assessment - non-ventilated 0.13 49-51 EcoTherm U-Value Calculator and Condensation Risk Assessment - ventilated 0.13 52-54 TLX Gold - 0.33 and 0.69 55 Flat Roofs SuperFOIL Flat Roof (Warm/Hybrid) 57 Insulation for Flat Extension - 0.13 58 Insulation for Flat Renovation 0.13 58 EcoTherm Bonded 0.13 59-62 TLX Gold - 0.33 and 0.69 63 Insulation and building regulations - Wales
ENGLAND INSULATION AND BUILDING REGULATIONS
For Renovations 0.16 and Extensions 0.15
PITCHED ROOFS
Pitched Roof (Internal)
U-Value 0.15 - Option 1
Tiles
Battens
Breathable Membrane
25mm Rafter Cavity
75mm PIR between rafters
40mm Rafter Cavity
SuperFOIL SF40
50mm Battens
Internal Finish
U-Value 0.15 - Option 2
Tiles
Battens
Breathable Membrane
25mm Rafter Cavity
110mm PIR between Rafters
25mm Rafter Cavity
SuperFOIL SF19+
38mm Battens
Internal Finish
1
U-Value 0.16 - Option 1
Tiles
Battens
Breathable Membrane
25mm Rafter Cavity
70mm PIR between rafters
30mm Rafter Cavity
SuperFOIL SF40
50mm Battens
Internal Finish
U-Value 0.16 - Option 2
Tiles
Battens
Breathable Membrane
25mm Rafter Cavity
100mm PIR between Rafters
25mm Rafter Cavity
SuperFOIL SF19+
38mm Battens
Internal Finish
2
Pitched Roof (External)
U-Value 0.15 - Option 1
Tiles
Battens
38mm Vertical Battens
SuperFOIL SF19BB
50mm Rafter Cavity
60mm PIR between rafters
30mm Rafter Cavity
SuperFOIL SF19+
38mm Battens
Internal Finish
U-Value 0.15 - Option 2
Tiles
Battens
50mm Vertical Battens
SuperFOIL SF40BB
100mm Rafter Cavity
SuperFOIL SF40
50mm Battens
Internal Finish
3
U-Value 0.16
Tiles
Battens
38mm Vertical Battens
SuperFOIL SF19BB
50mm Rafter Cavity
125mm PIR between Rafters
Internal Finish
4
Pitched Roof - Refurb Options to achieve 0.15 U-Value
OPTION 1: Roof Build-Up (Hybris + HControl)
Slate
Batten
Breather Felt
140mm Hybris between 175mm
Rafter
HControl stapled and taped to underside of rafter
38mm Counter Batten
Plasterboard
*Above spec to achieve 0.15 U-Value
OPTION 2: Roof Build-Up (Boost’R Hybrid + Hybris + HControl)
*Above spec to achieve 0.15 U-Value
Slate Batten
Counter Batten
Boost’R Hybrid ROOF
90mm Hybris between 150mm Rafter
HControl stapled and taped to underside of rafter
38mm Counter Batten
Plasterboard
OPTION 3: Roof Build-Up (Hybris + PIR Board)
Tile/ Slate
Batten
Breather Felt
125mm Hybris between 150mm
Rafter
60mm PIR to underside of rafter
VCL
Plasterboard
*Above spec to achieve 0.15 U-Value
5
Pitched Roof New Product (For Refurb Market) EOLIS HC 135mm to achieve 0.16 U-Value
EOLIS HC + PIR
Tile
Batten
Compliant with Sarking/ Bitchumen/Non Breather Felt/ Breather Felt
No Cross Ventilation Required
EOLIS HC stapled to underside of 100mm Rafter @ 400c
50mm Counter Batten
60mm PIR
VCL
Plasterboard
*Please see PF383 attached to confirm 0.16 U-Value
6
Build Up Options
0.15
Slate
Batten
TLX Gold draped
100mm PIR between 150mm rafters
40mm PIR under rafter
Plasterboard
0.16
Slate
Batten
TLX Gold draped
100mm PIR between 150mm rafters
30mm PIR under rafter
Plasterboard
0.16
Slate
Batten
TLX Gold draped
150mm PIR between 210mm rafters
30mm PIR under rafter
Plasterboard
7
0.15
Slate
Batten
TLX Gold draped
160mm PIR between 250mm rafters
40mm PIR under rafter
Plasterboard
0.15
Slate
Batten
Breather membrane
120mm PIR between 175mm rafters
TLX Silver
38mm counter batten
Plasterboard
0.16
Slate
Batten
Breather membrane
100mm PIR between 160mm rafters
TLX Silver
38mm counter batten
Plasterboard
8
1
Note – with PIR (Foil board) a VCL is needed between the plasterboard and insulation to reduce condensation OPTION 2
U-Value Ventilation/ Insulation Between Under 0.15 Ventilated 100mm Foil Board 70mm 0.15 Non-Ventilated 120mm Foil Board 50mm 0.15 SuperFOIL 110mm Foil Board SuperFOIL SF19+ 0.15 SuperFOIL 75mm Foil Board SuperFoil SF40
U-Value Ventilation/ Insulation Above Between Under 0.15 SuperFOIL SuperFOIL SF19BB 60mm Foil Board SuperFOIL SF19+ 0.15 SuperFOIL SuperFOIL SF40BB SuperFOIL SF40 0.15 Actis 140mm Hybris H Control (stapled to underside) Insulation
OPTION
needed for Pitched Extension U-Value 0.15
9
OPTION 3
OPTION 4
0.15 TLX TLX Gold counter battened with 20mm unventilated air cavity 160mm Foil Board (400mm centres) or 140mm Foil Board (600mm centres)
U-Value Ventilation/ Insulation Between Under 0.15 Actis 125mm Hybris 60mm Foil Board
U-Value
Between Under 0.15 Actis Boost R Hybrid Roof 90mm H Control (stapled to underside)
Ventilation/ Insulation
10
Actis Hybris
Insulation needed for Pitched Renovation
Note – with PIR (Foil board) a VCL is needed between the plasterboard and insulation to reduce condensation
1
2
U-Value Ventilation/ Insulation Between Under 0.16 Ventilated 100mm Foil Board 60mm 0.16 Non-Ventilated 120mm Foil Board 40mm 0.16 Actis 140mm Hybris H Control (stapled to underside) 0.16 SuperFOIL 70mm Foil Board SuperFOIL SF40 U-Value Ventilation/ Insulation Between Under 0.16 Actis 125mm Hybris 60mm Foil Board 0.16 SuperFOIL 100mm Foil Board SuperFOIL SF19+
U-Value 0.16
OPTION
OPTION
11
OPTION 3
If a renovation and you only have 100mm rafter depth
0.16 Eolis HC (stapled to the underside)
0.16 TLX TLX Gold counter battened with 20mm unventilated air cavity then 150mm foil board 150mm foil board between (400mm centres) or 130mm foil board between (600mm centres)
OPTION 4
Insulation
0.16 SuperFOIL SuperFOIL SF19BB 125mm Foil Board
SuperFOIL SF40
U-Value Ventilation/ Insulation Between Under
12
Ventilation/
Above Between Under
U-Value
13
Non Ventilated U-Value 0.15
14
15
Ventilated U-Value 0.15
16
17
18
19
Non Ventilated U-Value 0.16
20
21
Ventilated U-Value 0.16
22
23
24
Traditional homes built before 1950 often had shallow roof rafters (around 75mm to 100mm) as these homes typically relied on oil heaters for warmth.
This limited space presents a challenge when applying modern insulation standards during renovations. Traditional insulation materials often require thicker cavities, which can be impractical in these older structures.
TLX Gold solves this problem perfectly. With TLX Gold, you can achieve an impressive 86% improvement in thermal performance without needing to raise the roof or install counter battens. Plus, its Sd variable intelligence manages moisture effectively, preventing condensation risk.
TLX Gold is the only product on the market offering this complete solution and is backed by a BBA accreditation for your peace of mind.
0.69 Slate
TLX Gold draped
Min. 50mm rafters
Plasterboard
TLX Gold draped 50mm PIR between 100mm rafters
Plasterboard
25
0.33 Slate Batten
Batten
FLAT ROOFS
Flat Roof (Warm/Hybrid)
External Finish
70mm PIR
Boarding
38mm Firrings Minimum
SuperFOIL SF40
Joists
Internal Finish
External Finish
60mm PIR
Boarding
38mm Firrings Minimum
SuperFOIL SF40
Joists
Internal Finish U-Value 0.16 - Option 2
27
U-Value 0.15 - Option 1
Flat Roof (Cold)
U-Value 0.15 - Option 1
External Finish
Boarding
50mm Joist Cavity - ventilated
90mm PIR between joists
30mm Joist Cavity
SuperFOIL SF40
50mm Battens
Internal Finish
U-Value 0.16 - Option 2
External Finish
Boarding
50mm Joist Cavity- Ventilated
120mm PIR between joists
25mm Joist Cavity
SuperFOIL SF19+
38mm Battens
Internal Finish
28
Cold Flat Roof to achieve 0.16 U-Value
OPTION 1: Cold Flat Roof Build-Up (Hybris + HControl)
GRP External Finish
18mm Stirling Board
50mm Firrings Minimum
50mm Cross Ventilation
155mm Hybris between 175200mm Joist
HControl stapled and taped to underside of joist
38mm Counter Batten
Plasterboard
OPTION 2: Cold Flat Roof Build-Up (Hybris + PIR)
GRP/EPDM External Finish
18mm Stirling Board
50mm Firrings Minimum
50mm Cross Ventilation
155mm Hybris within 200mm Joist
50mm PIR fixed to underside of joist
VCL
Plasterboard
*Please see PF383 attached to confirm 0.16 U-Value
29
U-Value Ventilation/ Insulation Materials Needed 0.15 Timber or Concrete Deck 150mm Torch or Tissue Board 0.15 SuperFOIL 70mm Torch or Tissue Board and SuperFOIL SF40 0.16 Timber or Concrete Deck 140mm Torch or Tissue Board 0.16 SuperFOIL 60mm Torch or Tissue Board and SuperFOIL SF40 U-Value Ventilation/ Insulation Between Under 0.15 SuperFOIL 90mm Torch or Tissue Board SuperFOIL SF40 0.16 Actis 155mm Hybris between 175mm – 200mm joists H Control (stapled to the underside) U-Value Ventilation/ Insulation Between Under 0.16 Actis 155mm Hybris between 200mm joists 50mm Foil Board (to underside of the joists) 0.16 SuperFOIL 120mm Torch or Tissue Board SuperFOIL SF19+ Insulation needed for Flat Extension U-Value 0.15 and Flat Renovation U-Value 0.16 Insulation needed for Cold Flat Extension U-Value 0.15 and Cold Flat Roof Renovation U-Value 0.16 OPTION 1 OPTION 2 30
31 Bonded U-Value 0.15
32
33 Bonded
0.15
U-Value
34
35 Bonded
0.16
U-Value
36
37 Bonded U-Value 0.16
38
Traditional homes built before 1950 often had shallow roof rafters (around 75mm to 100mm) as these homes typically relied on oil heaters for warmth.
This limited space presents a challenge when applying modern insulation standards during renovations. Traditional insulation materials often require thicker cavities, which can be impractical in these older structures.
TLX Gold solves this problem perfectly. With TLX Gold, you can achieve an impressive 86% improvement in thermal performance without needing to raise the roof or install counter battens. Plus, its Sd variable intelligence manages moisture effectively, preventing condensation risk.
TLX Gold is the only product on the market offering this complete solution and is backed by a BBA accreditation for your peace of mind.
0.69 Slate
TLX Gold draped
Min. 50mm rafters
Plasterboard
100mm rafters
Plasterboard
39
0.33 Slate Batten
TLX Gold draped 50mm PIR between
Batten
INSULATION AND BUILDING REGULATIONS
WALES
For renovations and extensions 0.13
PITCHED ROOFS
Pitched Roof (Internal)
U-Value 0.13 - Option 1
Tiles
Battens
Breathable Membrane
25mm Rafter Cavity
110mm PIR between rafters
40mm Rafter Cavity
SuperFOIL SF40
50mm Battens
Internal Finish
U-Value 0.13 - Option 2
Tiles
Battens
Breathable Membrane
25mm Rafter Cavity
140mm PIR between rafters
25mm Rafter Cavity
SuperFOIL SF19+
38mm Battens
Internal Finish
42
Pitched Roof (External)
U-Value 0.13 - Option 1
Tiles
Battens
38mm Vertical Battens
SuperFOIL SF19BB
50mm Rafter Cavity
90mm PIR between rafters
30mm Rafter Cavity
SuperFOIL SF19+
38mm Battens
Internal Finish
U-Value 0.13 - Option 2
Tiles
Battens
50mm Vertical Battens
SuperFOIL SF40BB
50mm Rafter Cavity
25mm PIR between rafters
25mm Rafter Cavity
SuperFOIL SF40
50mm Battens
Internal Finish
43
U-Value 0.13 - Option 3
Tiles
Battens
38mm Vertical Battens
SuperFOIL SF19BB
50mm Rafter Cavity
170mm PIR between rafters
Internal Finish
44
OPTION
1: Roof Build-Up (Hybris + HControl)
*Above spec to achieve 0.13 U-Value
OPTION
Slate
Batten
Slate Batten
Breather Felt
170mm Hybris between 225mm
Rafter
HControl stapled and taped to underside of rafter
38mm Counter Batten
Plasterboard
2: Roof Build-Up (Boost’R Hybrid + Hybris + HControl)
Counter Batten
Boost’R Hybrid ROOF
140mm Hybris between 200mm
Rafter
HControl stapled and taped to underside of rafter
38mm Counter Batten
Plasterboard
*Above spec to achieve 0.13 U-Value
OPTION 3: Roof Build-Up (Hybris + PIR Board)
Tile/ Slate
Batten
Breather Felt
170mm Hybris between 200mm
Rafter
*Above spec to achieve 0.13 U-Value
60mm PIR to underside of rafter
VCL
Plasterboard
Pitched Roof to achieve 0.13
45
U-Value
Build Up Options
0.13
Slate
Batten
TLX Gold draped
190mm PIR between 250mm rafters
40mm PIR under rafter
Plasterboard
0.13
Slate
Batten
TLX Gold draped
100mm PIR between 150mm rafters
60mm PIR under rafter
Plasterboard
0.13
Slate
Batten
Breather membrane
150mm PIR between 210mm rafters
TLX Silver
38mm counter batten
Plasterboard
46
Insulation needed for Pitched Extension and Pitched Renovation U-Value 0.13
Note – with PIR (Foil board) a VCL is needed between
U-Value Ventilation/ Insulation Between Under 0.13 Ventilated 100mm Foil Board 90mm Foil Board 0.13 Non-Ventilated 120mm Foil Board 70mm 0.13 SuperFOIL 140mm Foil Board SuperFOIL SF19+ 0.13 SuperFOIL 110mm Foil Board SuperFOIL SF40 U-Value Ventilation/ Insulation Above Between Under 0.13 SuperFOIL SF19BB 90mm Foil Board SuperFOIL SF19+ 0.13 SuperFOIL SF40BB 25mm Foil Board SuperFOIL SF40 0.13 Actis 170mm Hybris H Control (stapled to underside) 0.13 SuperFOIL SF19BB 170mm Foil Board OPTION
1 OPTION 2
condensation 47
the plasterboard and insulation to reduce
OPTION 3
U-Value Ventilation/ Insulation
0.13 Actis Boost R Hybrid Roof
OPTION 4
U-Value Ventilation/ Insulation
0.13 Actis
Hybris H Control (stapled to the underside)
Hybris 60mm Foil Board
Between Under
140mm
Between Under
170mm
48
Actis Hybris
Non-Ventilated U-Value 0.13 49
50
51
Ventilated U-Value 0.13
52
53
54
Traditional homes built before 1950 often had shallow roof rafters (around 75mm to 100mm) as these homes typically relied on oil heaters for warmth.
This limited space presents a challenge when applying modern insulation standards during renovations. Traditional insulation materials often require thicker cavities, which can be impractical in these older structures.
TLX Gold solves this problem perfectly. With TLX Gold, you can achieve an impressive 86% improvement in thermal performance without needing to raise the roof or install counter battens. Plus, its Sd variable intelligence manages moisture effectively, preventing condensation risk.
TLX Gold is the only product on the market offering this complete solution and is backed by a BBA accreditation for your peace of mind.
0.69 Slate
TLX Gold draped
Min. 50mm rafters
Plasterboard
TLX
PIR between 100mm rafters
Plasterboard
55
0.33 Slate Batten
Gold draped 50mm
Batten
FLAT ROOFS
Flat Roof (Warm/Hybrid)
External finish
80mm PIR
Boarding
38mm Firrings Minimum
SuperFOIL SF40
Joists
Internal Finish
External finish
100mm PIR
Boarding
25mm Firrings Minimum
SuperFOIL SF19+ Joists
Internal Finish
U-Value
- Option 1 57
0.13
U-Value
0.13 - Option 2
U-Value Ventilation/ Insulation Materials Needed 0.13 Timber or Concrete Deck 80mm and 100mm Torch or Tissue Board 0.13 SuperFOIL 100mm Torch or Tissue Board and SuperFOIL SF19+ 0.13 SuperFOIL 80mm Torch or Tissue Board and SuperFOIL SF40 Insulation needed for Flat Extension and Flat Renovation U-Value 0.13 58 SuperFOIL SF19+
59
Bonded U-Value 0.13
60
61 Bonded U-Value 0.13
62
Traditional homes built before 1950 often had shallow roof rafters (around 75mm to 100mm) as these homes typically relied on oil heaters for warmth.
This limited space presents a challenge when applying modern insulation standards during renovations. Traditional insulation materials often require thicker cavities, which can be impractical in these older structures.
TLX Gold solves this problem perfectly. With TLX Gold, you can achieve an impressive 86% improvement in thermal performance without needing to raise the roof or install counter battens. Plus, its Sd variable intelligence manages moisture effectively, preventing condensation risk.
TLX Gold is the only product on the market offering this complete solution and is backed by a BBA accreditation for your peace of mind.
0.69 Slate
TLX Gold draped
Min. 50mm rafters
Plasterboard
TLX
PIR between 100mm rafters
Plasterboard
0.33 Slate Batten
Gold draped 50mm
Batten
63