NBS Clauses
Roofs
Walls
External Walls
Internal Walls
Floors
Ground Floors
Internal Floors
Pitched Roofs - Celing Level Insulation
Typical specification - Pc01 - Insulation between and above
joists - single layer
The whole area of the ceiling to be insulated with one layer of
Crown Loft Roll One of total thickness 270mm. Width of insulation
to be appropriate to the joist centres.
The insulation to be laid between the joists and to finish over
wall plate on external walls. All joints between the rolls of
insulation to be close butted. Maintain a minimum 25mm airspace
between insulation and HR roof tile underlay at the eaves. Do not
insulate under cold water tanks unless they are elevated.
Cold water tanks and pipes to be separately insulated. Loft
hatch to be insulated with a minimum 100mm depth of insulation.
Alternatively, refer to NBS clauses: P10/120 and 130.
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Typical specification - Pc02 - Insulation between and
above joists - double layer
The whole area of the ceiling to be insulated with two layers of
Crown Loft Roll 40*/44*/Crown CarbonZero Roll* of total thickness
......mm.
Width of first layer of insulation to be appropriate to the
joist spacings and of a thickness equal to joist depth. The
insulation to be laid between the joists and to finish over wall
plate on external walls. The second layer to be laid at right
angles to the first layer. All joints between the rolls of
insulation to be close butted. (*Delete as appropriate)
Maintain a minimum 25mm airspace between insulation and sarking
felt/sarking board at the eaves.
Do not insulate under cold water tanks unless they are elevated.
Cold water tanks and pipes to be separately insulated. Loft hatch
to be insulated with a minimum 100mm depth of insulation.
Alternatively, refer to NBS clauses: P10/120 and 130.
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Pitched Roofs - Rafter Level Insulation
Typical specification - Pr01 - Insulation between
rafters
The whole area of the pitched roof to be insulated with Crown
Room-in-Roof Roll 37…mm thick, friction fitted between the
rafters.
The insulation to be pushed over the wall plate at the eaves to
link up with the wall insulation.
Alternatively, refer to NBS clauses: P10/140 and 320
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Typical specification - Pr11 - Insulation between and above
rafters
Insulation laid over rafters to be Rocksilk Pitched Roof Slab,
......mm thick, located over the rafters.
All boards tightly butted and with staggered joints. Knauf
Breatheline should then be laid over the insulation with the edges
lapped.
The insulation and underlay to be held in place by 50 x 32mm
counter battens fixed through the boards, into the rafters.
The tiling battens to be nailed into the counter battens. Crown
Room-in-Roof Roll 32/37* or Crown Rafter Roll ......mm thick, to be
friction fitted between the rafters.(*Delete as appropriate)
The width of the insulation should be appropriate to the spacing
of the rafters.
Alternatively, refer to NBS clauses: K11/670 and P10/140 and
320
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Masonry Cavity Walls
Typical specification - MC01 - Full-fill insulation with
built-in glasswool
All external walls to be insulated during construction by
completely filling the cavities with Crown DriTherm Cavity
Slab/34*/32* ......mm thick. (*Delete as appropriate)
The first run of wall ties to be located at 600mm centres
horizontally (at a level to be decided by the specifier).
Subsequent runs of wall ties to be at not more than 900mm centres
horizontally, or as otherwise required by the structure, and at
450mm vertically.
All work under construction must be protected overnight and
during adverse weather conditions in accordance with BS 5628: Part
3: 1985.
Alternatively, refer to NBS clause: F30/10,150
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Typical specification - Mc03 -
Full-fill insulation with injected glasswool
Crown Supafil*/ Supafil Green cavity* wall isulation glass mineral
wool to be injected into the cavity by an Knauf Insulation/BBA
Approved Installer. (*Delete as appropriate)
New cavity walls to receive Crown
Supafil cavity wall insulation by injecting insulation into the
cavity should be constructed so that insulation cannot penetrate
ventilation ducts or pass through to cavities in adjoining
buildings or compartments which are not to be insulated. Close
fitting ducts or sleeves should be installed across the cavity to
serve air bricks and other ventilation openings.
Cavity barriers should be installed at
junctions with other properties and compartments, and as required
by the Building Regulations. Existing cavity walls to be inspected
by the Approved Installer and all necessary builder’s work carried
out prior to Crown Supafil Cavity Wall Insulation being
injected.
All work to be in strict accordance
with the procedures laid out in the relevant BBA Certificate and
the Knauf Insulation “Operators” and “Survey & Assessment”
manuals.
Alternatively, refer to NBS clause:
P11/40,220
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Timber Frame Walls
Typical specification - Tf01 - Single
layer insulation between studs
External wall panels to be insulated between studs using Crown
FrameTherm 43*/40* /38*/35*/32*/ Slab*......mm thick (*Delete as
appropriate).
Insulation to be cut as necessary and
friction fitted between studs.
The breather membrane stapled*/nailed*
to the sheathing and extend below the lowest timber member (*delete
as necessary).
Cavity barriers and fire stops should
be installed as required to meet the Building Regulations.
Alternatively, refer to NBS clause
P10/210.
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Typical specification - Tf04 -
Insulation between studs and to exterior of sarking
Twin insulation full fill system
External wall panels to be insulated
between studs using Crown FrameTherm Roll 40/35/32* ......mm thick
(*Delete as appropriate)
Insulation to be cut as necessary and
friction fitted between studs.The breather membrane
stapled*/nailed* to the sheathing and extend below the lowest
timber member (*Delete as appropriate).
Cavity formed between internal and
external leafs to be fully filled with Crown DriTherm Cavity Slab
......mm thick. The lowest run of wall ties to be located at 600mm
centres horizontally. Ties thereafter to be at 450mm centres
vertically and at 600mm centres horizontally. All work to be in
accordance with manufacturers instructions.
Twin insulated part fill system
Frame and breather membrane as above,
then:
Crown DriTherm Cavity Slab ......mm
thick to be fitted against the breather membrane on the face of the
sheathing and held back using insulation retaining clips fixed to
the wall ties.
The lowest run of wall ties to be
located at 600mm centres horizontally. Ties thereafter to be at
450mm centres vertically and at 600mm centres horizontally. All
work to be in accordance with manufacturers instructions.
Cavity barriers and fire stops should
be installed as required to meet the Building Regulations.
Alternatively, refer to NBS clauses:
P10/210, F30/10, 150 and F30/12, 155
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Typical specification - Tf05 - Single
layer blow-in insulation blanket system
External wall panels to be insulated betweenstuds using Knauf
Perimeter Plus Blow-in-Blanket System. The breather membrane
stapled*/nailed* to the sheathing and extend below the lowest
timber member (*Delete as appropriate).
Cavity barriers and fire stops should
be installed as required to meet the Building Regulations
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Internal Walls
Typical specification - Iw01 & 02
- Timber stud partition walls
Crown Acoustic Partition Roll, 50mm thick*/ Rocksilk Flexible Slab
50mm thick*, fixed between vertical studs. (*Delete as appropriate)
Insulation to fit snugly between studs and at bottom of the
structure to ensure that there are no air gaps.
Seal all gaps around the perimeter of
the plasterboard with acoustic sealant.
Alternatively, consult the National
Building Specifications (NBS) based on Standard Version K10/125. It
contains a set of proprietary clauses, which are edited versions
written by Knauf Insulation.
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Typical specification - Iw03 & 04
- Metal stud partition walls
In all …... (steel stud) partitions install acoustic insulation of
Crown Acoustic Partition Roll*/Rocksilk Flexible Slab*, …...mm
thick. Secure Crown Acoustic Partition Roll*/Rocksilk Flexible
Slab*l at head of partition using timber batten or light steel
angle. Insulation to fit snugly between studs and at bottom of the
structure to ensure that there are no air gaps. Seal partition at
perimeter and all service penetrations with an acoustic sealant.
(*Delete as appropriate)
Alternatively, consult the National
Building Specifications (NBS) based on Standard Version K10/125. It
contains a set of proprietary clauses, which are edited versions
written by Knauf Insulation
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Ground Floors
Typical specification - Gf01 -
Insulation below slab
The whole of the ground floor area between brick, block or concrete
subwalls to be insulated with Polyfoam Floorboard
Domestic*/Standard*/ Extra/*Super* …...mm thick and laid directly
over blinded hardcore.
Polyfoam Floorboard Standard, at least
25mm thick, to be cut and placed vertically against the subwalls to
the depth of the concrete slab.
The insulation to be laid
above*/below* damp proof membrane, which should lap the perimeter
wall DPC. Concrete slab and floor finish as specified by the
designer. (*delete as appropriate)
Alternatively, refer to NBS clause:
E20/30 or E20/200
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Typical specification - Gf02 -
Insulation above slab
Insulation below screed
Rocksilk Thermal Floor Slab Plus ......mm thick, to be close
butted and placed over the whole area of the floor. Rocksilk
Thermal Floor Slab Plus, 30mm thick, to be cut and placed to full
depth of screed and floor insulation at the floor perimeter.
The insulation to be overlaid with 1000 gauge polythene, taken
up and over the perimeter insulation. A 65mm thick sand/cement
screed with wire mesh*/ polypropylene reinforcing fibres* to be
laid on top. (NHBC recommend a D49 fabric mesh for use in floating
screeds.) Floor finish as specified by the designer. (* delete as
appropriate)
Alternatively, refer to NBS clause: M10/40 or M10/290
Insulation below chipboard
The whole area of the concrete floor to be lined with Rocksilk
Thermal Floor Slab Plus, …...mm thick. All boards to be close
butted.
The insulation to be (overlaid with a vapour control layer of
1000g polythene and)* covered with 18mm t&g flooring grade
chipboard. (*delete as required)
Alternatively, refer to NBS clause: K11/25 or K11/225
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Typical specification - Gf06 -
Suspended timber floor
Polypropylene netting to be (draped
over and between the joists and stapled to the sides of each
joist*/stapled to the underside of the joists*). (*delete as
required)
Crown Loft Roll 44*/40*/Rocksilk
Flexible Slab* of ......mm thickness and of width to suit joist
spacings, supported on the netting to fit tightly under the
floor.
Crown Loft Roll 44*/40*/Rocksilk
Flexible Slab* to be cut and placed to fully fill in the gap
between the last joist and the perimeter wall. T&g flooring
grade chipboard to be fixed to the floor joists, all as specified
by the designer.
Alternatively, refer to NBS clause:
P10/240 or P10/250
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Typical specification - Gf08 -
Underfloor heating
Polyfoam Tackaboard Standard*/ Extra* ......mm thick, to be
closely butted and placed over the whole area of the floor.
Polyfoam Tackaboard, at least 25mm thick, to be cut and placed to
full depth of screed at the floor perimeter.
A single run of pipe to be fixed firmly into the insulation
boards following the pattern of the pre-printed laying grid at
required pipe centres until the pipe returns to the manifold
system. The pipes to be tested before the screed is laid.
A 65mm thick sand/cement screed with wire mesh*/ polypropylene
reinforcing fibres* to be laid on top. (NHBC recommend a D49 fabric
mesh for use in floating screeds.) Floor finish as specified by the
designer. (* delete as appropriate)
Alternatively, refer to NBS clause: M10/40 or M10/290
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Internal Floors
Typical specification - If01 & 02
- Solid timber joists
Crown Acoustic Joist Roll*/Rocksilk
Flexible Slab*, 100mm thick, to be placed between the floor joists.
(*Delete as appropriate)
The ceiling and floor deck to be as specified by the
designer.
Alternatively, consult the National Building Specifications (NBS)
based on Standard Version P10/240. It contains a set of proprietary
clauses, which are edited versions written by Knauf Insulation.
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Typical specification - If04 -
Concrete beam & block floor
Crown Acoustic Partition Roll, 25mm thick, to be supported by
the horizontal members of the Knauf Drywall C-Form II ceiling
system. The plasterboard ceiling to be as specified by the
designer.
Alternatively, consult the National Building Specifications
(NBS) based on Standard Version. It contains a set of proprietary
clauses, which are edited versions written by Knauf Insulation.
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