57-59 Bread Street Edinburgh EH3 9AH UK
LDN
NBS SPECIFICATION
Tel: 0131 222 2900
Architects
Fax: 0131 222 2901
E: [email protected]
0806
ARCHERS HALL DEVELOMENT
NBS SPECIFICATION
M40
STONE/ CONCRETE/ QUARRY/ CERAMIC TILING/ MOSAIC
Revision
Date
Description
Revisions made since previous issue are highlighted in bold
*
18 DEC 09
A
01 FEB 10
Issued for Tender
Clause M40/110 amended. Conservation textured concrete paving added.
B
17 FEB 10
Clause M40/115 amended. Name amended to M40/116. Base amended.
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M40 STONE/ CONCRETE/ QUARRY/ CERAMIC TILING/ MOSAIC
To be read with Preliminaries/ General conditions.
TYPES OF TILING/ MOSAIC
110
-
-
115
-
TILING TO MEADOW LANE ACCESS LEVEL, NW TERRACE, BIKE STORE AND PLANT ROOM
Tiles: Wet cast concrete.
- Manufacturer/ Supplier:
Marshalls
Landscape House
Premier Way
Lowfields Business Park
Elland
West Yorkshire, HX5 9HT
T: 0845 3020 600.
W: http://www.marshalls.co.uk/wm.
Product reference: Conservation textured concrete paving.
- Colour: Charcoal and Silver grey.
- Finish: s
- Size: 600x600mm.
- Thickness: 63mm.
- Slip potential:
Slip resistance value (SRV) (minimum)/ Pendulum test value (PVT) (minimum) to BS 7932 or BS
EN 14231 (natural stone only): ______ .
Surface roughness (Rz) (minimum) to BS 1134: ______ .
- Recycled content: N/A.
Background/ Base: Varies.
Compacted ground to access area from Meadow Lane as per NBS Q20.
Reinforced concrete slab to NW terrace, Bike Store and Plant room as per NBS E05.
- Preparation: As recommended by manufacturer.
Bedding: As recommended by manufacturer.
- Reinforcement: As recommended by manufacturer.
- Adhesive: As recommended by manufacturer.
Joint width: 5mm.
Grout: As recommended by manufacturer.
Movement joints: As recommended by manufacturer.
Accessories: Tiles to terrace area to be mounted on spacers as per NBS TBC.
NATURAL STONE COVERING TO ENTRANCE PAVILION GARDEN LEVEL
Type: Slabs to BS EN 12057.
Stone:
- Name (traditional): Caithness slate.
- Petrological family: Slate
- Colour: From black to dark grey.
- Origin: Caithness query, Scotland.
- Finish: Honed.
- Supplier:
Caithness Stone Industries Ltd
The Shore
Wick
Caithness
KW1 4JW
T: 01955 605 472
F: 01955 605 907
W: www.caithnessstoneindustries.com
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116
-
-
- Quality: Free from vents, cracks, fissures, discoloration, or other defects deleterious to
strength/ colour.
- Size: Alternating arrangement between 400mm wide and 800mm wide x random lengths.
- Thickness: 20mm.
- Slip potential:
Slip resistance value (SRV) (minimum) to BS EN 14231: ______ .
Surface roughness (Rz) (minimum) to BS 1134: ______ .
- Other requirements: ______ .
Background/ Base: RC ground floor slab as section E05.
- Preparation: As recommended by manufacturer.
Bedding: As recommended by manufacturer.
- Adhesive: As recommended by manufacturer.
Joint width: 3mm.
Grout: To suit flooring with rubber (bows storage room) and polished screed (archery butts).
Movement joints: As clause 80.
Accessories: As recommended by manufacturer.
Allow for supply of samples for client approval prior to final order.
NATURAL STONE COVERING FOR EXTERNAL USE (ARCHERY GARDEN AND ACCESS FROM
FORECOURT)
Type: Slabs to BS EN 12057
Stone:
- Name (traditional): Caithness slate.
- Petrological family: Slate
- Colour: From black to dark grey.
- Origin: Caithness query, Scotland.
- Finish: Flamed.
- Supplier:
Caithness Stone Industries Ltd as above
- Quality: Free from vents, cracks, fissures, discoloration, or other defects deleterious to
strength/ colour.
- Size: Alternating arrangement between 400mm wide and 800mm wide x random lengths.
- Thickness: 20mm.
- Slip potential:
Slip resistance value (SRV) (minimum) to BS EN 14231: ______ .
Surface roughness (Rz) (minimum) to BS 1134: ______ .
- Other requirements: ______ .
Background/ Base: Top soil as per NBS Q28.
- Preparation: As recommended by manufacturer.
Bedding: As recommended by manufacturer.
- Adhesive: As recommended by manufacturer.
Joint width: 3mm.
Grout: N/A.
Movement joints: As clause 80.
Accessories: As recommended by manufacturer.
Allow for supply of samples for client approval prior to final order.
GENERAL
210
-
SUITABILITY OF BACKGROUNDS/ BASES
Background/ base tolerances: To permit specified flatness/ regularity of finished surfaces given
the permissible minimum and maximum thickness of bedding.
New background drying times (minimum):
- Concrete walls: 6 weeks.
- Brick/ block walls: 6 weeks.
- Rendering: 2 weeks.
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- Gypsum plaster: 4 weeks.
New base drying times (minimum):
- Concrete slabs: 6 weeks.
- Cement:sand screeds: 3 weeks.
215
-
FALLS IN THE BASES
General: Give notice if falls are inadequate.
220
-
SWIMMING POOL TILING
Watertightness of pool base/ substrate structure: Test and prove to be watertight.
Time intervals between stages of the work (minimum):
- Completion (curing) of pool shell to start of rendering/ screeding/ tiling: 6 weeks.
- Completion of rendering/ screeding to start of tiling: 3 weeks.
- Completion of tiling to start of grouting: 3 days.
- Completion of grouting and sealing of movement joints to filling of pool: 3 weeks.
Filling, emptying and heating pool: Minimize stresses.
- Maximum filling and emptying rate: 750 mm/24 hour.
- Maximum rate of heating water: 0.25°C/hour.
-
250
-
SAMPLES
General: Submit representative samples of the following: Tiles for external use.
252
-
NATURAL STONE SAMPLES
General: Submit samples in accordance with Tiles for internal and external use.
260
-
CONTROL SAMPLES
General: Complete sample areas, being part of finished work, in locations as follows: ______ .
PREPARATION
310
-
EXISTING BACKGROUNDS/ BASES GENERALLY
Efflorescence, laitance, dirt and other loose material: Remove.
Deposits of oil, grease and other materials incompatible with the bedding: Remove.
Tile, paint and other nonporous surfaces: Clean.
Wet backgrounds: Dry before tiling.
320
-
EXISTING CONCRETE/ SCREEDS
Loose or hollow portions: Cut out.
Making good: ______ .
330
-
EXISTING PLASTER
Defective areas: Remove plaster that is loose, soft, friable, badly cracked or affected by
efflorescence. Cut back to straight horizontal and vertical edges.
Making good: Use plaster or non-shrinking filler.
340
-
EXISTING GLAZED BRICK
Defective areas: Cut out.
Making good: ______ .
350
-
EXISTING TILES
Loose or hollow sounding tiles: Remove.
Making good: ______ .
355
-
OLD ADHESIVE RESIDUES ON CONCRETE/ SCREED BASES
Soft or unsound adhesive residues: Remove without damaging base.
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360
-
EXISTING PAINT
Paint with unsatisfactory adhesion: Remove so as not to impair bedding adhesion.
370
-
NEW IN SITU CONCRETE
Backrounds/ bases to be tiled: Remove mould oil, surface retarders and other materials
incompatible with bedding.
380
-
NEW PLASTER
Plaster: Dry, solidly bedded, free from dust and friable matter.
Plaster primer: Apply if recommended by adhesive manufacturer.
390
-
PLASTERBOARD BACKGROUNDS
Boards: Dry, securely fixed and rigid with no protruding fixings and face to receive decorative
finish exposed.
400
-
BACKGROUNDS ______
Boards: Dry, securely fixed and rigid with no protruding fixings.
Surfaces to be tiled: Seal or prime if recommended by adhesive manufacturer.
410
-
HACKING FOR KEY
Keying: Roughen backgrounds thoroughly and evenly to a depth of 3 mm.
Backgrounds to be keyed: ______ .
420
-
RAKING OUT FOR KEY
Soft joints in existing masonry: Rake out to a depth of 13 mm (minimum).
430
-
SPATTERDASHING FOR KEY
Spatterdash mix:
- Cement: Portland to BS EN 197-1 type CEM I/42.5.
- Sand: Clean coarse.
- Proportions (cement:sand): 1-1.5:2.
- Admixture: ______ .
- Consistency: Thick slurry with no segregation.
Application/ finish: Thrown.
- Thickness: 3-5 mm.
Curing/ drying: Keep damp until hardened. Dry out to provide securely bonded finish.
431
-
-
STIPPLING FOR KEY
Stipple mix:
- Cement: Portland to BS EN 197-1 type CEM I/42.5.
- Sand: Clean coarse.
- Proportions (cement:sand): 1-1.5:2.
- Admixture: ______ .
Application/ finish: Brush applied to a deep close texture.
Curing/ drying: Keep damp until hardened. Dry out to provide securely bonded finish.
438
-
PREPARING CONCRETE BASES FOR FULLY BONDED BEDDING
Surface cement:sand matrix: Remove to expose coarse aggregate.
Surface preparation: Suitable to achieve a full bond with bedding. Select from:
- Keep well wetted for several hours. Remove free water then brush in a slurry bonding coat.
- Slurry: ______ .
- Prepare, prime as necessary and apply a bonding agent.
- Bonding agent: ______ .
444
-
PREPARING CONCRETE BASES FOR PARTIALLY BONDED BEDDING
Surface finish: Brushed, with no laitance.
Surface preparation: Suitable to achieve a full bond with bedding. Select from:
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Keep well wetted for several hours. Remove free water then brush in a slurry bonding coat.
Slurry: ______ .
Prepare, prime as necessary and apply a bonding agent.
Bonding agent: ______ .
450
-
PREPARING CONCRETE BASES FOR UNBONDED BEDDING - WITHOUT SEPARATING LAYER
Surface finish: Smooth.
Surface preparation: Dampen lightly before laying mortar bed.
451
-
PREPARING CONCRETE BASES FOR UNBONDED BEDDING
Separating layer: ______ .
- Lap at joints: 100 mm.
460
-
SMOOTHING UNDERLAYMENT
Type: Recommended by adhesive manufacturer.
Condition: Allow to dry before tiling.
470
-
INTERMEDIATE SUBSTRATE
Type: ______ .
- Manufacturer: ______ .
Product reference: ______ .
- Thickness: ______ .
Fixing system: ______ .
- Manufacturer: ______ .
Product reference: ______ .
- Application: ______ .
- Substrate surface: Secure, true and even.
Joints: Close butt.
- Treatment: ______ .
Penetrations: Seal.
Accessories: ______ .
-
-
FIXING
510
530
540
FIXING GENERALLY
Colour/ shade: Unintended variations within tiles for use in each area/ room are not permitted.
- Variegated tiles: Mix thoroughly.
Adhesive: Compatible with background/ base. Prime if recommended by adhesive manufacturer.
Cut tiles: Neat and accurate.
Fixing: Provide adhesion over entire background/ base and tile backs.
Final appearance: Before bedding material sets, make adjustments necessary to give true,
regular appearance to tiles and joints when viewed under final lighting conditions.
Surplus bedding material: Clean from joints and face of tiles without disturbing tiles.
SETTING OUT
Joints: True to line, continuous and without steps.
- Joints on walls: Horizontal, vertical and aligned round corners.
- Joints in floors: Parallel to the main axis of the space or specified features.
Cut tiles: Minimize number, maximize size and locate unobtrusively.
Joints in adjoining floors and walls: Align.
Joints in adjoining floors and skirtings: Align.
Movement joints: Where locations are not indicated, submit proposals.
Setting out of ______ : Drawing references: ______ .
Setting out of ______ : Submit proposals.
LEVEL OF FLOOR TILING
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Permissible deviation in level from datum: ______ .
550
-
FLATNESS/ REGULARITY OF TILING
Sudden irregularities: Not permitted.
Deviation of surface: Measure from underside of a 2 m straightedge placed anywhere on
surface. The straightedge should not be obstructed by the tiles and no gap should be greater
than 3 mm.
560
-
LEVEL OF TILING ACROSS JOINTS
Deviation (maximum) between tile surfaces either side of any type of joint:
- 1 mm for joints less than 6 mm wide.
- 2 mm for joints 6 mm or greater in width.
570
-
MORTAR BEDDING
Bedding mix:
- Cement: Portland to BS EN 197-1 type CEM I/42.5.
- Sand for walls: To BS 1199, type A.
- Sand for floors: To BS EN 13139.
- Grading designation: 0/4 (MP) category 1 fines and between 20%-66% passing a 0.5 sieve.
Batching: Select from:
- Batch by weight.
- Batch by volume: Permitted on the basis of previously established weight:volume
relationships of the particular materials. Use accurate gauge boxes. Allow for bulking of
damp sand.
Mixing: Mix materials thoroughly to uniform consistence. Use a suitable forced action
mechanical mixer. Do not use a free fall type mixer.
Application: At normal temperatures use within two hours. Do not use after initial set. Do not
retemper.
-
578
-
CRACK CONTROL REINFORCEMENT
Type to BS 4483: ______ .
Installation: Place centrally in depth of bed. Lap not less than 100 mm and securely tie together
with steel wire.
Corners: Avoid a four layer build at corners.
580
-
POROUS TILES
Tiles to be bedded in cement:sand: Soak in clean water for at least 30 minutes. Fix as soon as
surface water has drained.
590
-
COVED TILE SKIRTINGS
Sequence: Bed solid to wall before laying floor tiles.
Bedding: ______ .
600
-
SIT-ON TILE SKIRTINGS
Sequence: Bed solid to wall after laying floor tiles.
Bedding: ______ .
610
-
MULTISTOREY EXTERNAL TILING
Sequence: Start fixing at the highest level and work downwards. Protect exposed top edges.
Copings, sills, etc.: Complete as soon as practicable.
650
-
THIN BED ADHESIVE - RIBBED (WALLS)
Application: Apply 3 mm floated coat of adhesive to dry background in areas of approximately 1
m². Trowel to ribbed profile.
Tiling: Press tiles firmly onto float coat.
651
THIN BED ADHESIVE - SOLID (WALLS)
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660
-
Application: Apply floated coat of adhesive to dry background in areas of about 1 m². Comb
surface.
Tiling: Apply thin even coat of adhesive to backs of dry tiles. Press tiles firmly onto float coat.
Finished adhesive thickness (maximum): 3 mm.
THIN BED ADHESIVE - MESH BACKED MOSAIC (WALLS)
Application: Apply 3 mm floated coat of adhesive to dry background. Comb surface.
Placing mosaic sheets: Hang in horizontal rows, working downwards. Stagger vertical joints.
Prevent slippage of sheets. Lightly beat mosaics into adhesive.
Width, plane and alignment of joints between sheets: To match joints between mosaic tiles.
661
-
THIN BED ADHESIVE - PAPER FACED MOSAIC (WALLS)
Application: Apply 3 mm floated coat of adhesive to dry background. Comb surface.
Preparing mosaic sheets: Pre-grout. Remove surplus before fixing.
Placing mosaic sheets: Hang in horizontal rows, working downwards. Stagger vertical joints.
Width, plane and alignment of joints between sheets: To match joints between mosaic tiles.
Paper face: Before adhesive hardens completely, remove paper face. Complete grouting. Wash
off glue from face of mosaic.
670
-
THICK BED ADHESIVE - SOLID (WALLS)
Application: Apply floated coat of adhesive to dry background. Comb surface.
Tiling: Apply thin even coat of adhesive to backs of dry tiles. Press tiles firmly onto float coat.
Finished adhesive thickness: Within range recommended by manufacturer.
690
-
CEMENT:SAND BEDDING (WALLS)
Preparation: Dampen background.
Application: Apply floated coat: 1:3-4 cement:sand mortar bedding.
- Thickness (maximum): 10 mm.
- Finish: Equivalent to wood float. Before tiling allow to stiffen slightly.
Tiling: Without delay, apply 2 mm thick coat of 1:2 cement:fine sand mortar to backs of tiles,
filling keys. Press tiles firmly onto float coat. Tap firmly into position.
710
720
730
-
THICK BED ADHESIVE - SOLID (FLOORS)
Application: Apply floated coat of adhesive to dry base and comb surface.
Tiling: Apply coat of adhesive to backs of tiles filling depressions or keys. Press tiles firmly into
position.
Finished adhesive thickness: Within range recommended by manufacturer.
CEMENT:SAND BEDDING (FLOORS)
Mortar bedding mix: 1:3-4 cement:sand.
- Consistency: Stiff plastic.
Laying: Lay suitably small working areas of screeded bed. Compact thoroughly to level.
- Finished bed thickness: 15-25 mm.
Tiling: Within two hours and before bedding sets, evenly coat backs of tiles with adhesive. Press
tiles firmly into position.
Finished adhesive thickness: Within range recommended by manufacturer.
SEMIDRY CEMENT:SAND BEDDING (FLOORS)
Mortar bedding mix: 1:3.5-4 cement:sand.
- Water content: A film of water must not form on surface of bed when fully compacted.
Preparation: Dampen base.
Laying: Lay suitably small working areas of screeded bed. Compact thoroughly to level.
- Finished bed thickness (minimum): ______ .
- Finished bed thickness (maximum): ______ .
Tiling: Within two hours and before bedding sets, evenly coat backs of tiles with a neat cement
slurry. Beat tiles firmly into position.
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740
-
-
CEMENT:LIME SAND BEDDING (FLOORS)
Mortar bedding mix: 1:1: ______ cement:lime:sand.
- Cement: Portland to BS EN 197-1, type CEM I/42.5
- Lime:sand (coarse stuff): Ready-mixed to BS EN 998-2.
- Sand: To BS EN 13139.
- Grading designation: 0/4 (MP) category 1 fines and between 20%-66% passing a 0.5 sieve.
- Consistency: Stiff plastic. A film of water must not form on surface of bed when fully
compacted.
Preparation: Dampen base.
Laying: Lay and compact bed to level.
Tiling: Tamp tiles firmly into position.
MOVEMENT JOINTS/ GROUTING/ COMPLETION
805
-
815
-
825
835
855
-
SEALANT MOVEMENT JOINTS WITH METAL EDGINGS ______
Edging material: ______ .
- Size: ______ .
- Bedding: Bed in 1:3 cement:sand.
Installation: Centre over joints in base. Set to exact finished level of floor.
- Fixing to base: ______ .
Joint width: ______ .
Sealant: ______ .
- Colour: ______ .
- Preparation and application: As section Z22.
SEALANT MOVEMENT JOINTS ______
Joints: Extend through tiles and bedding to base/ background. Centre over joints in base/
background.
- Width: ______ .
Sealant: ______ .
- Colour: ______ .
- Preparation and application: As section Z22.
STRIP MOVEMENT JOINTS ______
Manufacturer: ______ .
- Product reference: ______ .
- Colour: ______ .
Joint width: ______ .
Fixing to base: ______ .
Joints: Extend through tiles and bedding to base.
METAL SECTION MOVEMENT JOINTS ______
Manufacturer: ______ .
- Product reference: ______ .
- Colour: ______ .
Bedding: Bed in 1:3 cement:sand.
Installation: Centre over joints in base. Set to exact finished level of floor.
Fixing to base: ______ .
CEMENT:SAND GROUTING MIX
Grout mix:
- Cement: ______ .
- Sand:
- Joint widths of 6 mm or greater: To BS 1199, table 1, Type B.
- Joint widths of 3-6 mm: To BS 5385-5, table 2.
- Proportions (cement:sand): ______ .
- Pigment: ______ .
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Mixing: Mix thoroughly. Use the minimum of clean water needed for workability.
865
-
CEMENT:LIME SAND GROUTING MIX
Grout mix:
- Cement: ______ .
- Hydrated nonhydraulic lime: To BS EN 459.
- Sand:
- Joint widths of 6 mm or greater: To BS 1199 table 1, Type B.
- Joint widths of 3-6 mm: To BS 5385-5, table 2.
- Proportions (cement:lime:sand): ______ .
- Pigment: ______ .
Mixing: Mix thoroughly. Use the minimum of clean water needed for workability.
875
885
-
GROUTING
Sequence: Grout when bed/ adhesive has set sufficient to prevent disturbance of tiles.
Joints: 6 mm deep (or depth of tile if less). Free from dust and debris.
Grouting: Fill joints completely, tool to profile, clean off surface. Leave free from blemishes.
- Profile: ______ .
Polishing: When grout is hard, polish tiling with a dry cloth.
COLOURED GROUT
Staining of tiles: Not permitted
Evaluating risk of staining: Apply grout to a few tiles in a small trial area. If discoloration occurs
apply a protective sealer to tiles and repeat trial.
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