Internal walls and partitions
New-build and conversion
For new-build and for new walls in material change of use (conversion), Building Regulations Approved
Document E states that the following internal walls and partitions must meet the Rw 40 dB
requirement:
● An internal wall between bedrooms
● An internal wall between a bathroom / WC and a habitable room
● An internal wall between bedrooms and any other room
Where internal walls include a door, they are exempt from this requirement.
Example systems
GypWall CLASSIC
Stud:
Gypframe 70 S 50 ‘C’ Studs
Centres:
600mm
Maximum height:
3600mm
Wall lining:
12.5mm Gyproc SoundBloc (each side)
Rw 40 dB
30 minutes fire resistance
Timber stud
Stud:
Non-loadbearing 63mm x 38mm timber
Centres:
600mm
Maximum height: 3600mm
Wall lining:
15mm Gyproc SoundBloc (each side)
Additional info:
Timber noggings may be required for structural support
Rw 40 dB
30 minutes fire resistance
The fire resistance and sound insulation performances are for imperforate (e.g. sealed and airtight) partitions, walls and ceilings incorporating
boards with all joints taped and filled, or skimmed according to British Gypsum’s recommendations. The quoted performances are achieved only
if British Gypsum components are used throughout, and the Company’s fixing recommendations are strictly observed. Any variation in the
specifications should be checked with British Gypsum.
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DriLyner BASIC
Wall construction: 100mm medium density concrete blocks (minimum 120kg / m2)
Plasterboard
fixing method:
DriLyner BASIC using Gyproc Dri-Wall Adhesive
Wall lining:
15mm Gyproc SoundBloc (each side)
Rw 40 dB
30 minutes fire resistance (dependent on base wall performance)
For partitions that do not fall into the above criteria, for example a wall that includes a door, there is
no requirement to improve the acoustic insulation, therefore 12.5mm Gyproc WallBoard can be used
to line either side of the partition.
To upgrade the acoustic insulation of existing masonry partitions, Gyproc Soundcoat Plus can be used
to seal air paths before using DriLyner BASIC to ‘dot and dab’ Gyproc SoundBloc to the walls.
The fire resistance and sound insulation performances are for imperforate (e.g. sealed and airtight) partitions, walls and ceilings incorporating
boards with all joints taped and filled, or skimmed according to British Gypsum’s recommendations. The quoted performances are achieved only
if British Gypsum components are used throughout, and the Company’s fixing recommendations are strictly observed. Any variation in the
specifications should be checked with British Gypsum.
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Internal floors
New-build and conversion
For new-build and new floors in material change of use (conversion), Building Regulations Approved
Document E state that internal floors are required to meet Rw 40 dB.
Fixing plasterboard directly into timber joists can result in nail or screw popping. Using Gypframe RB2
SureFix Bars in the construction of the ceiling can eliminate this problem, and help maintain the
performance and the aesthetics of the ceiling.
Example systems
Solid timber joist (600mm centres)
Flooring:
22mm tongue and groove chipboard flooring
Joists:
195mm x 38mm solid joists at 600mm centres
Ceiling lining:
12.5mm Gyproc SoundBloc
Rw 42 dB
30 minutes fire resistance
Solid timber joist (600mm centres)
Flooring:
22mm tongue and groove chipboard flooring
Joists:
195mm x 38mm solid joists at 600mm centres
Ceiling lining:
15mm Gyproc WallBoard
Rw 40 dB
30 minutes fire resistance
The fire resistance and sound insulation performances are for imperforate (e.g. sealed and airtight) partitions, walls and ceilings incorporating
boards with all joints taped and filled, or skimmed according to British Gypsum’s recommendations. The quoted performances are achieved only
if British Gypsum components are used throughout, and the Company’s fixing recommendations are strictly observed. Any variation in the
specifications should be checked with British Gypsum.
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Solid timber joist (450mm centres)
Flooring:
22mm tongue and groove chipboard flooring
Joists:
195mm x 38mm solid joists at 450mm centres
Ceiling fixing:
Gypframe RB2 SureFix Bars
Ceiling lining:
12.5mm Gyproc WallBoard
Rw 41 dB
30 minutes fire resistance
Intregral garage conversion
When building an integral garage, the floor acts as a bridge between a heated and unheated space.
Building Regulations require the floor and ceiling to meet 30 minutes fire resistance whilst also
providing thermal insulation. The following system provides example guidance.
Floor for integral garage
Flooring:
22mm tongue and groove chipboard flooring
Joists:
195mm x 38mm solid joists at 600mm centres
Insulation:
200mm Isover Space Saver Roll
Ceiling lining:
15mm Gyproc FireLine
30 minutes fire resistance
U value 0.22 W / m2K
The fire resistance and sound insulation performances are for imperforate (e.g. sealed and airtight) partitions, walls and ceilings incorporating
boards with all joints taped and filled, or skimmed according to British Gypsum’s recommendations. The quoted performances are achieved only
if British Gypsum components are used throughout, and the Company’s fixing recommendations are strictly observed. Any variation in the
specifications should be checked with British Gypsum.
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Separating walls
New-build
When building new separating / party walls between dwellings Building Regulations Approved
Document E states they are required to meet the 45 dB DnTw + Ctr requirement.
Example systems
Lightweight aggregate blockwork with wet plaster
Wall construction: Lightweight aggregate cavity block wall (minimum 100mm blocks with a density between
1350 - 1600 kg / m3)
Cavity:
Minimum 75mm cavity between blockwork
Wall lining:
13mm Thistle plaster - undercoat and finish coat (each side)
Robust Detail E-WM-2 meets the 45 dB DnTw + Ctr requirement
60 minutes fire resistance (dependent on base wall performance)
Lightweight aggregate blockwork with render and plasterboard
Wall construction: Lightweight aggregate cavity block wall (minimum 100mm blocks with a density between
1350 - 1600 kg / m3)
Wall preparation:
6mm Gyproc Soundcoat Plus (each side)
Plasterboard
fixing method:
DriLyner BASIC using Gyproc Dri-Wall Adhesive
Wall lining:
12.5mm Gyproc WallBoard (each side)
Robust Detail E-WM-4 meets the 45 dB DnTw + Ctr requirement
30 minutes fire resistance (dependent on base wall performance)
For separating wall and floor constructions to be fully effective, care must be taken to correctly detail the junctions between the separating wall
or floor and associated elements such as external walls, other separating elements and penetrations or door openings, etc.
The fire resistance and sound insulation performances are for imperforate (e.g. sealed and airtight) partitions, walls and ceilings incorporating
boards with all joints taped and filled, or skimmed according to British Gypsum’s recommendations. The quoted performances are achieved only
if British Gypsum components are used throughout, and the Company’s fixing recommendations are strictly observed. Any variation in the
specifications should be checked with British Gypsum.
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Conversion
For material change of use / conversion of separating walls, Building Regulations state that they are
required to meet the 43 dB DnTw + Ctr requirement.
Often upgrading existing separating walls can only be achieved from one side of the wall, therefore to
reduce as much air leakage as possible, apply a 6-8mm coat of Gyproc Soundcoat Plus to the masonry
wall prior to installation of a drylining system to increase its acoustic potential.
Example systems
Masonry wall with DriLyner SI
Wall construction: Masonry wall such as brickwork (minimum 200kg / m2)
Plasterboard
fixing method:
DriLyner SI using Gyproc Dri-Wall Adhesive with Gyproc Nailable Plugs
Wall lining:
52mm Gyproc TriLine
Additional info:
Wall must be plastered on the other side
43 dB DnTw + Ctr
60 minutes fire resistance (dependent on base wall performance)
This system is more suited to reducing mid-frequency sounds, such as speech.
Masonry wall with GypLyner UNIVERSAL
Wall construction: Masonry wall (such as brickwork)
Cavity:
Minimum 35mm cavity (created by GypLyner UNIVERSAL system) with 25mm Isover APR 1200 insulation
Wall lining:
2 x 12.5mm Gyproc SoundBloc
Additional info:
Wall must be plastered on the other side
43 dB DnTw + Ctr
60 minutes fire resistance (dependent on base wall performance)
This system will provide better acoustic insulation against hard to tackle low-frequency sounds, such as home cinema
systems.
For separating wall and floor constructions to be fully effective, care must be taken to correctly detail the junctions between the separating wall
or floor and associated elements such as external walls, other separating elements and penetrations or door openings, etc.
The fire resistance and sound insulation performances are for imperforate (e.g. sealed and airtight) partitions, walls and ceilings incorporating
boards with all joints taped and filled, or skimmed according to British Gypsum’s recommendations. The quoted performances are achieved only
if British Gypsum components are used throughout, and the Company’s fixing recommendations are strictly observed. Any variation in the
specifications should be checked with British Gypsum.
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Separating floors
New-build
When building new separating floors between dwellings Building Regulations Approved Document E
state they are required to meet the 45 dB DnTw + Ctr requirement.
Example systems
Solid timber joist with timber battens
Flooring:
18mm tongue and groove chipboard flooring
Under flooring
layer:
19mm Gyproc Plank
Battens:
Resilient composite timber battens at 400mm centres
Floor insulation:
65mm Isover APR 1200
Sub-deck:
15mm OSB
Joists:
Minimum 220mm solid timber joists at 400mm centres
Ceiling fixing:
Gypframe RB1 Resilient Bar at 400mm centres
Joist cavity fill:
100mm Isover APR 1200
Ceiling lining:
19mm Gyproc Plank and 12.5mm Gyproc WallBoard
Robust Detail E-FT-2 meets the 45 dB DnTw + Ctr requirement
60 minutes fire resistance
For separating wall and floor constructions to be fully effective, care must be taken to correctly detail the junctions between the separating wall
or floor and associated elements such as external walls, other separating elements and penetrations or door openings, etc.
The fire resistance and sound insulation performances are for imperforate (e.g. sealed and airtight) partitions, walls and ceilings incorporating
boards with all joints taped and filled, or skimmed according to British Gypsum’s recommendations. The quoted performances are achieved only
if British Gypsum components are used throughout, and the Company’s fixing recommendations are strictly observed. Any variation in the
specifications should be checked with British Gypsum.
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Solid timber joist with Gypframe Steel Battens
Flooring:
22mm tongue and groove chipboard flooring
Under flooring
layer:
19mm Gyproc Plank
Battens:
70mm Gypframe 70 SB 65 Steel Battens at 400mm centres
Floor insulation:
50mm Isover APR 1200
Sub-deck:
15mm OSB
Joists:
Minimum 240mm solid timber joists at 400mm centres
Ceiling fixing:
Gypframe RB1 Resilient Bar at 450mm centres
Joist cavity fill:
100mm Isover APR 1200
Ceiling lining:
2 x 15mm Gyproc SoundBloc
Additional info:
Where a cavity is required between the ceiling and the joists, Gypframe Resilient Bars can be replaced
with the CasoLine MF ceiling, to give a 287mm cavity
45 dB DnTw + Ctr
60 minutes fire resistance
Engineered timber ‘I’ joist with timber battens
Flooring:
22mm tongue and groove chipboard flooring
Under flooring
layer:
19mm Gyproc Plank
Battens:
Resilient composite timber battens at 400mm centres
Floor insulation:
50mm Isover APR 1200
Sub-deck:
15mm OSB
Joists:
Minimum 240mm engineered timber ‘I’ joists at 400mm centres
Ceiling fixing:
Gypframe RB1 Resilient Bar at 400mm centres
Joist cavity fill:
100mm Isover APR 1200
Ceiling lining:
19mm Gyproc Plank and 12.5mm Gyproc SoundBloc
Robust Detail E-FT-1 meets the 45 dB DnTw + Ctr requirement
60 minutes fire resistance
For separating wall and floor constructions to be fully effective, care must be taken to correctly detail the junctions between the separating wall
or floor and associated elements such as external walls, other separating elements and penetrations or door openings, etc.
The fire resistance and sound insulation performances are for imperforate (e.g. sealed and airtight) partitions, walls and ceilings incorporating
boards with all joints taped and filled, or skimmed according to British Gypsum’s recommendations. The quoted performances are achieved only
if British Gypsum components are used throughout, and the Company’s fixing recommendations are strictly observed. Any variation in the
specifications should be checked with British Gypsum.
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Conversion
For material change of use / conversion of separating walls, Building Regulations Approved Document E
state they are required to meet the 43 dB DnTw + Ctr requirement.
Example systems
Solid timber joist with GypFloor SILENT and CasoLine MF ceiling
Flooring:
21mm tongue and groove chipboard flooring
Under flooring
layer:
19mm Gyproc Plank
Joist channels:
Gypframe SIF Floor Channels
Joists:
Solid timber joists
Cavity fill:
100mm Isover APR 1200
Ceiling system:
CasoLine MF suspended ceiling to give a 277mm cavity
Ceiling lining:
2 x 15mm Gyproc SoundBloc
Floor depth:
From top of joist approximately 30mm
Overall floor /
ceiling depth:
Approximately 340mm
43 dB DnTw + Ctr
60 minutes fire resistance
For separating wall and floor constructions to be fully effective, care must be taken to correctly detail the junctions between the separating wall
or floor and associated elements such as external walls, other separating elements and penetrations or door openings, etc.
The fire resistance and sound insulation performances are for imperforate (e.g. sealed and airtight) partitions, walls and ceilings incorporating
boards with all joints taped and filled, or skimmed according to British Gypsum’s recommendations. The quoted performances are achieved only
if British Gypsum components are used throughout, and the Company’s fixing recommendations are strictly observed. Any variation in the
specifications should be checked with British Gypsum.
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Solid timber joist with GypFloor SILENT
Flooring:
21mm tongue and groove chipboard flooring
Joist channels:
Gypframe SIF Floor Channels
Joists:
Solid timber joists at 450mm or 600mm centres
Cavity fill:
100mm Isover APR 1200
Ceiling system:
Gypframe RB1 Resilient Bar at 450mm centres
Ceiling lining:
Inner layer 19mm Gyproc Plank
Outer layer 12.5mm Gyproc SoundBloc
Floor depth:
Approximately 30mm
Ceiling depth:
Approximately 50mm
Additional info:
Where a cavity is required between the ceiling and the joists, Gypframe Resilient Bars can be replaced
with the CasoLine MF ceiling, to give a 287mm cavity
43 dB DnTw + Ctr
60 minutes fire resistance
Solid timber joist with GypFloor SILENT and retained ceiling
Flooring:
21mm tongue and groove chipboard flooring
Under flooring
layer:
19mm Gyproc Plank
Joist channels:
Gypframe SIF Floor Channels
Joists:
Solid timber joists (minimum 50mm width)
Fire protection:
Cavity bridged between joists by 12.5mm Glasroc F MULTIBOARD, resting on 12.5mm Glasroc F MULTIBOARD
strips, screw fixed to each joist (fixed flush)
Cavity fill:
100mm Isover APR 1200
Ceiling lining:
Original lath and plaster ceiling
Floor depth:
Approximately 30mm
Ceiling depth:
None
Test and declare1
60 minutes fire resistance
1
Where the original ceiling needs to be retained, for example an ornate lath and plaster ceiling in an historic building, it may not be possible
to achieve the regulatory standards. It may therefore be permitted to test on site and declare the performance achieved subject to Building
Control acceptance.
For separating wall and floor constructions to be fully effective, care must be taken to correctly detail the junctions between the separating wall
or floor and associated elements such as external walls, other separating elements and penetrations or door openings, etc.
The fire resistance and sound insulation performances are for imperforate (e.g. sealed and airtight) partitions, walls and ceilings incorporating
boards with all joints taped and filled, or skimmed according to British Gypsum’s recommendations. The quoted performances are achieved only
if British Gypsum components are used throughout, and the Company’s fixing recommendations are strictly observed. Any variation in the
specifications should be checked with British Gypsum.
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External walls
New-build
Building Regulations Approved Document L1A stipulates that compliance is based on the carbon
performance of the whole dwelling and a whole building measure is given through the use of a SAP
calculation.
There are many factors that influence the SAP calculation and the U-value of the external envelope
(external walls) is only one part of this. Therefore the following example systems detail different
U-values that can be achieved by using alternate Gyproc ThermaLine laminates; this should help give
the flexibility required when designing a new property.
In Scotland, Building Regulations Section 6 stipulates minimum performances and these can vary
depending on the type of heating system.
Example systems
Full-fill cavity wall with medium density blocks
External leaf:
103mm brick skin
Cavity:
75mm cavity full-filled with Isover Hi-Cav
Internal leaf:
100mm medium dense block (0.61 W/m2K)
Plasterboard
fixing method:
Wall lining:
DriLyner BASIC with Gyproc Dri-Wall Adhesive or DriLyner TL using Gyproc Dri-Wall Adhesive and Gyproc
Nailable Plugs
Gyproc WallBoard or Gyproc ThermaLine laminate (see below)
U-value
Gyproc ThermaLine laminate
Wall thickness (mm)
0.17
70mm Gyproc ThermaLine SUPER
358
0.18
60mm Gyproc ThermaLine SUPER
348
0.20
50mm Gyproc ThermaLine SUPER
338
0.25
40mm Gyproc ThermaLine PLUS
328
0.26
35mm Gyproc ThermaLine PLUS
323
0.34
12.5mm Gyproc WallBoard
301
The fire resistance and sound insulation performances are for imperforate (e.g. sealed and airtight) partitions, walls and ceilings
incorporating boards with all joints taped and filled, or skimmed according to British Gypsum’s recommendations. The quoted
performances are achieved only if British Gypsum components are used throughout, and the Company’s fixing recommendations are
strictly observed. Any variation in the specifications should be checked with British Gypsum.
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Full-fill cavity wall with aircrete blocks
External leaf:
103mm brick skin
Cavity:
75mm cavity full-filled with Isover Hi-Cav insulation
Internal leaf:
100mm aircrete block (0.11 W/m2K)
Plasterboard
fixing method:
DriLyner BASIC with Gyproc Dri-Wall Adhesive or DriLyner TL using Gyproc Dri-Wall Adhesive and
Gyproc Nailable Plugs
Wall lining:
Gyproc WallBoard or Gyproc ThermaLine laminate (see below)
U-value
Gyproc ThermaLine laminate
Wall thickness (mm)
0.18
50mm Gyproc ThermaLine SUPER
338
0.22
40mm Gyproc ThermaLine SUPER
328
0.23
35mm Gyproc ThermaLine PLUS
323
0.24
27mm Gyproc ThermaLine PLUS
315
0.26
22mm Gyproc ThermaLine BASIC1
310
0.28
12.5mm Gyproc WallBoard
301
1 Two coats of Gyproc Drywall Sealer are required to provide a vapour control layer.
Conversion
Building Regulations Approved Document L1B includes extensions, creating new dwellings through a
change of use, or alterations to existing dwellings. The thermal element, i.e. the wall, roof or floor that
separates a heated space from an unheated space, must achieve set U-values and these vary
depending on whether the thermal element is in an extension or renovation of an existing element.
The following table highlights the U-value required, and these values can then be selected from the
following example systems.
L1B
New element
(e.g. extensions)
Renovations
Wall
Cavity wall
0.30
0.30
0.35 (0.70)1
0.55 (0.70)1
1 If the current
element is worse than the U-value quoted in brackets, then they should be upgraded to the adjacent U-value.
In Scotland, Building Regulations Section 6 stipulates minimum performances. For walls, typically
0.27 W/m2K is required.
The fire resistance and sound insulation performances are for imperforate (e.g. sealed and airtight) partitions, walls and ceilings
incorporating boards with all joints taped and filled, or skimmed according to British Gypsum’s recommendations. The quoted
performances are achieved only if British Gypsum components are used throughout, and the Company’s fixing recommendations are
strictly observed. Any variation in the specifications should be checked with British Gypsum.
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Example systems
Clear cavity wall with medium density blocks
External leaf:
103mm brick skin
Cavity:
Minimum 50mm clear cavity
Internal leaf:
100mm medium dense block (0.61 W/m2K)
Plasterboard
fixing method:
DriLyner TL using Gyproc Dri-Wall Adhesive and Gyproc Nailable Plugs
Wall lining:
Gyproc ThermaLine laminate (see below)
U-value
Gyproc ThermaLine laminate
Wall thickness (mm)
0.21
90mm Gyproc ThermaLine SUPER
353
0.26
70mm Gyproc ThermaLine SUPER
333
0.30
60mm Gyproc ThermaLine SUPER
323
Clear cavity wall with aircrete blocks
External leaf:
103mm brick skin
Cavity:
Minimum 50mm clear cavity
Internal leaf:
100mm aircrete block (0.11 W/m2K)
Plasterboard
fixing method:
DriLyner TL using Gyproc Dri-Wall Adhesive and Gyproc Nailable Plugs
Wall lining:
Gyproc ThermaLine laminate (see below)
U-value
Gyproc ThermaLine laminate
Wall thickness (mm)
0.19
90mm Gyproc ThermaLine SUPER
353
0.20
80mm Gyproc ThermaLine SUPER
343
0.23
70mm Gyproc ThermaLine SUPER
333
0.26
60mm Gyproc ThermaLine SUPER
323
0.31
50mm Gyproc ThermaLine SUPER
313
0.54
30mm Gyproc ThermaLine BASIC1
293
1 Two coats of Gyproc Drywall Sealer are required to provide a vapour control layer.
The fire resistance and sound insulation performances are for imperforate (e.g. sealed and airtight) partitions, walls and ceilings
incorporating boards with all joints taped and filled, or skimmed according to British Gypsum’s recommendations. The quoted
performances are achieved only if British Gypsum components are used throughout, and the Company’s fixing recommendations are
strictly observed. Any variation in the specifications should be checked with British Gypsum.
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Brick and brick clear cavity wall
External leaf:
103mm brick skin
Cavity:
Minimum 50mm clear cavity
Internal leaf:
103mm brick
Plasterboard
fixing method:
DriLyner TL using Gyproc Dri-Wall Adhesive and Gyproc Nailable Plugs
Wall lining:
Gyproc ThermaLine laminate (see below)
U-value
Gyproc ThermaLine laminate
Wall thickness (mm)
0.21
90mm Gyproc ThermaLine SUPER
356
0.23
80mm Gyproc ThermaLine SUPER
346
0.26
70mm Gyproc ThermaLine SUPER
336
0.30
60mm Gyproc ThermaLine SUPER
326
0.37
50mm Gyproc ThermaLine SUPER
316
0.55
40mm Gyproc ThermaLine PLUS
306
Solid brick wall
Wall construction: 215mm solid brick wall
Plasterboard
fixing method:
GypLyner UNIVERSAL (or DriLyner RF using Gyproc Sealant, where stated)
Wall lining:
Gyproc ThermaLine laminate (see below)
U-value
Gyproc ThermaLine laminate
Wall thickness (mm)
0.24
70mm Gyproc ThermaLine SUPER and 50mm Isover APR 1200
335
0.25
80mm Gyproc ThermaLine SUPER (no insulation and 25mm cavity)
320
0.27
70mm Gyproc ThermaLine SUPER and 25mm Isover APR 1200
310
0.33
60mm Gyproc ThermaLine SUPER using DriLyner RF (brickwork
plastered internally)
291 (minimum)
The fire resistance and sound insulation performances are for imperforate (e.g. sealed and airtight) partitions, walls and ceilings
incorporating boards with all joints taped and filled, or skimmed according to British Gypsum’s recommendations. The quoted
performances are achieved only if British Gypsum components are used throughout, and the Company’s fixing recommendations are
strictly observed. Any variation in the specifications should be checked with British Gypsum.
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Solid stone wall
External leaf:
300mm solid stone wall
Plasterboard
fixing method:
GypLyner UNIVERSAL
Wall lining:
Gyproc ThermaLine laminate (see below)
U-value
Gyproc ThermaLine laminate
Wall thickness (mm)
0.23
90mm Gyproc ThermaLine SUPER
415
0.25
70mm Gyproc ThermaLine SUPER and 50mm Isover APR 1200
420
0.26
80mm Gyproc ThermaLine SUPER
405
0.28
60mm Gyproc ThermaLine SUPER and 50mm Isover APR 1200
410
0.28
70mm Gyproc ThermaLine SUPER and 25mm Isover APR 1200
395
0.32
60mm Gyproc ThermaLine SUPER and 25mm Isover APR 1200
385
Render and block wall
Wall construction: 16mm external render, 190mm medium density block (0.61 W/m2K)
Plasterboard
fixing method:
GypLyner UNIVERSAL (or DriLyner RF using Gyproc Sealant, where stated)
Wall lining:
Gyproc ThermaLine laminate (see below)
U-value
Gyproc ThermaLine laminate
Wall thickness (mm)
0.24
80mm Gyproc ThermaLine SUPER using DriLyner RF (blockwork
plastered internally)
302
0.24
70mm Gyproc ThermaLine SUPER and 50mm Isover APR 1200
326
0.26
70mm Gyproc ThermaLine SUPER and 25mm Isover APR 1200
307
0.32
60mm Gyproc ThermaLine SUPER using DriLyner RF (blockwork
plastered internally)
282
Window reveals
Window reveals can often be a weak point in the thermal insulation as space is
restricted for fitting Gyproc ThermaLine laminates.
27mm Gyproc ThermaLine PLUS is a thin laminate that can be used around window
reveals and where space is tight. Ensuring all surfaces of external walls are
covered with some insulation will improve the overall insulation of the space.
The fire resistance and sound insulation performances are for imperforate (e.g. sealed and airtight) partitions, walls and ceilings
incorporating boards with all joints taped and filled, or skimmed according to British Gypsum’s recommendations. The quoted
performances are achieved only if British Gypsum components are used throughout, and the Company’s fixing recommendations are
strictly observed. Any variation in the specifications should be checked with British Gypsum.
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Basements and cellars
Rooms beneath the ground can be difficult to treat as moisture can travel through the ground.
Basements and cellars can have a tanking treatment to reduce this occurrence, however this can
cause condensation to form on the inside of the room.
The GypLyner IWL (Independent Wall Lining) system builds away from existing walls, fixing to floors,
ceilings and adjacent walls to support the framework to reduce the contact with any tanking. Gyproc
ThermaLine PLUS has a high level of thermal insulation as well as a vapour control barrier to reduce
condensation forming behind the lining.
Seek advice
Some tanking methods will be downgraded if there is any penetration in the tanking seal.
BS5250:2002 contains some limited guidance. However, we would advise you to seek the guidance of
a specialist in the field of Hygrothermal performance and properties for structures below ground to
determine whether there is any risk of interstitial condensation within the construction.
The fire resistance and sound insulation performances are for imperforate (e.g. sealed and airtight) partitions, walls and ceilings
incorporating boards with all joints taped and filled, or skimmed according to British Gypsum’s recommendations. The quoted
performances are achieved only if British Gypsum components are used throughout, and the Company’s fixing recommendations are
strictly observed. Any variation in the specifications should be checked with British Gypsum.
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Room-in-the-roof and loft spaces
New-build
Building Regulations Approved Document L stipulates that the external fabric (e.g. gable walls) meet minimum
requirements to comply with thermal performances. Example constructions for wall and roof linings are shown
below.
In Scotland, Building Regulations Section 6 stipulates minimum performances which can vary depending on the
type of heating system, typically 0.27 W/m2K for walls, 0.20 W/m2K for pitched roofs with insulation between the
rafters (room-in-the-roof) and 0.16 W/m2K for pitched roofs with insulation between ceiling joists (loft spaces).
Example systems
Wall linings
Studs:
Timber studs at 600mm centres
Insulation:
Installed between the studs (see below)
Timber fraction:
15%
Wall lining:
Gyproc ThermaLine laminate or plasterboard (see below)
U-value
Insulation
Gyproc ThermaLine laminate / plasterboard
0.24
140mm Isover Frame Batt 35
40mm Gyproc ThermaLine PLUS
0.25
140mm Isover Frame Batt 34
40mm Gyproc ThermaLine BASIC1
0.30
100mm Isover Frame Batt 35
35mm Gyproc ThermaLine PLUS
0.30
140mm Isover Frame Batt 34
12.5mm Gyproc WallBoard DUPLEX
1 Two coats of Gyproc Drywall Sealer are required to provide a vapour control layer.
Roof lining
Roof construction: Tiled or slated roof on tiling battens on breather membrane. Softwood rafters at 600mm centres
Insulation:
Installed between the rafters (see below)
Timber fraction:
8.3%
Roof lining:
Gyproc ThermaLine laminate (see below)
U-value
Insulation
Gyproc ThermaLine laminate
0.13
200mm (4 x) 50mm Isover Frame Batt 32
70mm Gyproc ThermaLine SUPER
0.13
200mm (2 x) 100mm Isover Frame Batt 35
70mm Gyproc ThermaLine SUPER
0.16
140mm Isover Frame Batt 34
70mm Gyproc ThermaLine SUPER
0.19
100mm Isover Frame Batt 35
70mm Gyproc ThermaLine SUPER
The fire resistance and sound insulation performances are for imperforate (e.g. sealed and airtight) partitions, walls and ceilings
incorporating boards with all joints taped and filled, or skimmed according to British Gypsum’s recommendations. The quoted
performances are achieved only if British Gypsum components are used throughout, and the Company’s fixing recommendations are
strictly observed. Any variation in the specifications should be checked with British Gypsum.
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Conversion
Whether insulating a loft space to meet Building Regulations Approved Document L or transforming
it to a liveable room-in-the-roof, the following U-value requirements should be met.
L1B
Wall
Pitched roof with insulation
between the rafters (room-in-the-roof)
Pitched roof with insulation
between ceiling joists (loft space)
Extensions
0.30
Renovations
0.35 (0.70)1
0.20
0.20 (0.35)1
0.16
0.16 (0.35)1
1
If the current element is worse than the U-value quoted in brackets, then they should be upgraded to the adjacent U-value.
Cavity walls can be upgraded to just 0.55.
In Scotland, Building Regulations Section 6 stipulates minimum performances typically 0.27 W/m2K
for walls, 0.20 W/m2K for pitched roofs with insulation between the rafters (room-in-the-roof) and
0.16 W/m2K for pitched roofs with insulation between ceiling joists (loft spaces).
Details on suitable external wall linings can be found earlier in this guide.
Care should be taken to ensure any work is carried out in accordance with local planning rules,
specifically where there are changes to the ridge or shape of the roof and the type of area the dwelling
is located.
Example systems
Insulation at the ceiling (loft space)
Insulation
between rafters:
170mm Isover Space Saver Roll
Timber fraction:
6.3%
Ceiling lining:
Gyproc ThermaLine laminate (see below)
U-value
Gyproc ThermaLine laminate
0.16
70mm Gyproc ThermaLine SUPER
The fire resistance and sound insulation performances are for imperforate (e.g. sealed and airtight) partitions, walls and ceilings
incorporating boards with all joints taped and filled, or skimmed according to British Gypsum’s recommendations. The quoted
performances are achieved only if British Gypsum components are used throughout, and the Company’s fixing recommendations are
strictly observed. Any variation in the specifications should be checked with British Gypsum.
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Wall linings
Studs:
Timber studs at 600mm centres
Insulation:
Installed between the studs (see below)
Timber fraction:
15%
Wall lining:
Gyproc ThermaLine laminate or plasterboard (see below)
U-value
Insulation
Gyproc ThermaLine laminate / plasterboard
0.24
No insulation
90mm Gyproc ThermaLine SUPER
0.24
140mm Isover Frame Batt 35
40mm Gyproc ThermaLine PLUS
0.27
No insulation
80mm Gyproc ThermaLine SUPER
0.27
140mm Isover Frame Batt 35
27mm Gyproc ThermaLine PLUS
0.30
100mm Isover Frame Batt 35
35mm Gyproc ThermaLine PLUS
0.30
140mm Isover Frame Batt 34
12.5mm Gyproc WallBoard DUPLEX
Roof lining
Roof construction: Tiled or slated roof on tiling battens on sarking felt with a 50mm ventilated cavity.
Softwood rafters at 600mm centres (see below)
Insulation:
Installed between the rafters (see below)
Timber fraction:
8.3%
Roof lining:
Gyproc ThermaLine laminate or plasterboard (see below)
U-value
Insulation
Gyproc ThermaLine laminate
0.19
150mm rafters with 100mm Isover Frame Batt 35 70mm Gyproc ThermaLine SUPER
0.20
125mm rafters with 75mm phenolic foam
60mm Gyproc ThermaLine SUPER
0.20
150mm rafters with 100mm phenolic foam
50mm Gyproc ThermaLine SUPER
The fire resistance and sound insulation performances are for imperforate (e.g. sealed and airtight) partitions, walls and ceilings
incorporating boards with all joints taped and filled, or skimmed according to British Gypsum’s recommendations. The quoted
performances are achieved only if British Gypsum components are used throughout, and the Company’s fixing recommendations are
strictly observed. Any variation in the specifications should be checked with British Gypsum.
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