Washroom guide

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L E A D I N G O F F S I T E T E C H N O L O G Y

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OFFICE WASHROOM / WC

Design Guide

33WASHROOM V.01 ISSUED 07.10.2013

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1.0 Design Principles 4

2.0 Core Layouts 5

3.0 Key Dimensions 6

4.0 Strategy 8

4.1 Scope 9

4.2 Interface 9

5.0 Components Floors & Flooring 10

5.1 Skirtings 11

5.2 WC Cubicles 11

5.3 Ambulant Cubicles 12

5.4 Cubicle Frontages 13

5.5 Vanity Units 14

5.6 Hand Drying 15

5.7 Taps & Soap Dispensers 15

5.8 Urinals 16

5.9 Ceilings 17

5.10 Other Walls 18

5.11 Disabled Toilets 19

5.12 Showers 20

5.13 Cleaners Cupboards 20

5.14 Sanitaryware 21

5.15 Brassware 24

6.0 Mechanical & Electrical 25

6.1 Mechanical Services 25

6.2 Lighting 27

6.3 Air Conditioning & Ductwork 28

7.0 Metechno Approach 29

Client’s Notes Page 35

Contents

The guide is intended to promote a consistent, efficient

and high quality approach to the design of washrooms

and associated building service elements.

This is one in a series of Metechno Design Guides

and should be read in conjunction with the relevant

specification for the project being undertaken.

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© copyright Metechno Limited - not to be reproduced/forwarded without permission


NOTES:

The ventilation plant and riser distribution must be capable of serving the ‘expansion’ accommodation to the above specification.

The above is to be read in conjunction with the requirements of BS 6465: 2006.

Above information supplied kindly by Land Securities.

design principles1.0

Washroom/WC designs vary rarely change but can accommodate new thinking and thought processes. In this document we have tried to guide you through our processes of best practice and design for manufacture, whilst also indicating areas for potential architectural flair within the washroom/WC area.

Design Criteria Preferences

Office Developments

Occupancy Density: 1 person per 10 sq.m Male to Female Ratio: 50% - 50% Expansion Facility: 1 person per 6 sq.m

West End Dealer AccommodationOccupancy Density: 1 person per 10 sq.m Male to Female Ratio: 50% - 50% Expansion Facility: 1 person per 6 sq.m Male to Female Ratio: 80% - 40%

City Dealer AccommodationOccupancy Density: 1 person per 10 sq.m Male to Female Ratio: 50% - 50% Expansion Facility: 1 person per 5 sq.m (- 15% for absenteeism) Male to Female Ratio: 80% - 40% Supply air ventilation: 8 air changes per hour Extract air ventilation: 10 air changes per hour Room air temperature (min): 18 deg. C db. Room air temperature (max): 24 deg. C db (if comfort cooling provided) Lighting levels (at FFL): 200-250 Lux subject to choice of finishes

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core layouts2.0

The following core layouts are a selection of typical washroom/WC configurations.

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key dimensions of a typical washroom/wc3.0

The layout of a toilet should be based upon a 900mm grid, which will allow good ergonomic space planning and will allow for alignment of likeminded detailing.

The following dimensions where possible should be adhered to:

Architectural dimensions

A - Vanity to cubicle frontage 1200 min (1500mm preferred)

B - Internal dimension of cubicle 1500mm

C - Cubicle centres 900 mm

D - Urinal centres 700 mm min

E - Vanity depth 600 mm with 40 mm cleaning gap

Ceiling heightsStandard 2400mm FFL to ceiling height, which allows for economic usage of standard materials, sufficient height for detailing and suitable above ceiling void for bulky services ductwork etc.

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Services dimensions

F - WC wall 300mm

G - Back to back WC wall 450mm (may need to increase for acoustics)

H - Vanity wall 150mm

J - Urinal wall (cistern) 200mm

WC CUBICLE DUCT ZONE

VANITY UNIT DUCT ZONE URINAL DUCT ZONE

BACK TO B ACKWC CUBICLE DUCT ZONE

BACK TO B ACKWC CUBICLE DUCT ZONE

WITH ACOUSTIC SEPARATION

strategy4.0

There are three approaches to the washroom/WC fit out and care should be taken when selecting each option.


Traditional approach• Suitsbothnewbuildandrefurbishment • Labourandskillsavailabilityissues • Needslargematerialmovement • Perceptionofbeingcheapoption • Qualityandconsistencynotassured • Programmeuncertainty • Typicallysignificantsitewaste

TECHNO-WALLTM

Prefabricated Offsite Walling System (Product Code MET W1.01)

• Suitsbothnewbuildandrefurbishment • Canbemadetosuithoistdimensions • Lessmaterialmovementsonsite • Perceptionofbeingcostlyoption • Qualityandconsistencyassured • Significantprogrammerewards(compression) • Sitewastereduced

TECHNO-PODTM

Prefabricated Offsite Pods (Product Code MET P1.01)

TECHNO-MODTM

Prefabricated Offsite Modules (Product Code MET M1.01)

• Suitsnewbuildonly • Mayrequirelongerleadinperiod • Canplacepointleadstrainonfloorloading • Hasdimensionalrestrictionsduetotransportation • Onproject’scriticalpath • Massiveprogrammerewards(compression) • Qualityandconsistencyassured • Sitewastenegated

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scope

interface details for discussion/prompt

4.1

4.2


Once the approach has been determined it is advisable to agree upon the scope of the package and the relationship with the adjacent trade interfaces.

Full fit out (within a defined area)

• AllStacksandVentstoagreedconnectionpointatroof/basementlevel • HotandColdwatertotoiletareaincludingwaterheater(ifonscheme) • Electricalworksandcircuitrytolocaldistributionboard • Horizontalductworkintomainductworkriserbyothers • Allcomponentswithinformeddrywallbox(byothers)

Partial fit out (within a defined area)

• HorizontalwastestoallSanitarywareuptoagreedconnectionpoint • HotandColdwatertotoiletareafromdefinedpointwithinarea • Pluginlightfittingsintopre-fittedrosesbyothers • Flexiblesandgrillesonlytoductwork • Allcomponentsasscopedwithinformeddrywallbox(byothers)

Finishes fit out (within defined area) consider the following options:

• AllservicesbytheShellandCoreM&Econtractor • Allcomponentswithintheformeddrywallboxbyothers

• Distributionboardinlocal/adjacentriser • Overflowmonitoring/leakdetectionmaybenecessary • FirealarmandPAworksbyothers,mayrequireco-ordinationwithprogramme • Disabledalarmscope • Stackandventstart/stoppoint • Commissioningresponsibilityandextent • Firecompartmentationandfiredamperpositions • Acousticsandapproachtomaintainingthespecification • Privacy(especiallyondooropening) • Ductworkaccessforcleaningregime • Allaccessvalveandmaintenancepoints • Sprinklers

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components - floors and flooring5.0

The preferred option is for a calcium sulphate raised floor system on pedestals which can accommodateafloorfrom50mmto500mmzone;thisallowstheeliminationofwettradessuch as screed and provides for programme advantages with follow-on trades such as drying time etc.

Thefloorcanbeeither ;

• Ceramictile(preferredoption) • NaturalStone(20mmmax) • Reconstitutedtile • Typicaltiledimensionsfrom450x450,600x300,300x300,900x300etc.

Grid layouts to suit the architectural concept but still maintaining the 900mm grid.

Grout colour to match tile but leaning to a dark shade to negate the need for replacement/significant maintenance once cleaning regime is commenced.

Care should be taken to specify correct finish around urinals, as uric acid is the most aggressive substance in a toilet environment.


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An industry recognised specialist for the technical support of stone and ceramic is Domus - www.domustiles.co.uk


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skirtings

wc cubicles

5.1

5.2


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The skirting tile should be of the same material as the floor normally 100 mm high, with the exception in the cubicles which could be in stainless steel, but in all cases the skirting tile should be flush with the adjacent wall finishes.

These should ideally be 900 mm centres with an overall maximum depth of 1500mm and with a basic two (or more panel) elevation with a fixed lower panel and accessible upper panels mounted on hinges with a concealed locking device.

Back panels can be laminate, veneer or clad in back painted glass but the detailing is basically the same in each case with the allowance of 20mm for each of the stated finishes.

ambulant cubicle5.3

These must have a minimum clear width of 800 mm with an additional 750mm activity space beyond.

Ambulant WC should be ideally wall hung and complete with a concealed cistern and stainless steel dual flush faceplate (as above) but the height needs to be 480mm in lieu of the standard 400mm which can be achieved with a high seat or mounting the WC higher on the frame.

The cubicle door must open out and it is advisable to use the last cubicle in the run where possible.

Twohorizontalandoneverticalgrabrailsneedtobeprovidedwithinthecubicleasaminimumstandard.


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Clothes hook set at1400 above floor level500 min 100

800 min

750 activityspace clear ofdoor swings


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cubicle frontages5.4


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These are designed to be flush wall appearance comprising of a 45mm solid core construction faced and balanced with a FSC veneer, laminate or lacquer with a pilaster detail between each cubicle allowing a rebate detail to adhere to privacy requirements.

Each door is hung on a single pair rising butt hinges all with a ‘D’ line disabled WC snib and a buffered coat hook to rear.

Note that each door should have a continuous buffered gasket to help eliminate slamming.

An industry recognised specialist for the technical support of cubicles is FR Shadbolt - www.shadbolt.co.uk

vanity units5.5

Sinks are to be an under slung complete with Sink Platform and chrome bottle trap and pipe work. (Please refer to 5.14 for further details).

Splash backs behind sinks need to be a glass or suitable cleanable surface with special attention placed upon the paper towel dispenser and towel chute co-ordination.

Full height mirrors shall be provided above vanity units. The mirrors shall align with the joints in the vanity unit stone and shall be set forward for the angled towel dispensers but have a small floating detailforthehorizontalwallrecessedtoweldispenser.

Shelving for bags, books, briefcases etc. need to be considered and if feasible these should be designed as part of the vanity stone tops with provision for these items.

Should dimensions constrain this option a neatly designed shelf above the stone or at the end of the vanity should be considered. Under no circumstances should protruding shelves be designed in conjunctions with mirrors.

An industry recognised specialist for the technical support of stone tops is Domus - www.domus.co.uk

The ‘floating stone’ top is the firm starting point. This is supported from cantilevered 6mm bracketry within the prefabricated wall section.

Tops typically are 30mm natural stone or reconstituted stone requiring research and proof for suitability of usage.

Tops can be solid 30mm but can be detailed with a dropped edge or additional fascia should the designer require. Centres of sinks to be 900mm as a preference although this dimension can reduce to a min of 700mm.


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hand drying5.6

taps & soap dispensers5.7


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Therearetwoapproachesforthiselement;

• Papertowels/chutes/bins • Handdriers

Paper towel combinations - wall mounted flat option or angled behind vanity mirror either dropping into a floor mounted plastic or stainless steel round bin through a 100mm diameter hole cut through worktop.

Even if hand driers are not initially supplied, provide necessary conduit to a fused spur for each tenant to install in the future if required.

The use of combined hand-dryer towel dispenser and bin should be considered as an option.

An industry recognised specialist for the technical support of washroom accessories is Allgood - www.allgood.co.uk

Taps shall be sensor tap with independent soap dispensers (plastic bottle) both mounted on the ledge on the sink. Most makes of taps can be utilised within this set up. (Please refer to 5.14 for further details).

ALL TAPS MUST BE WRAS APPROVED.

Typical tap Typical soap dispenser


urinals5.8

These should ideally be on the 900mm grid lines but should never be less than 700 mm centres. These can be basic two (or three) panel elevation with a fixed lower panel and accessible upper panel mounted on hinges with a concealed locking device.

Back panels can be laminate, stone, tiling or clad in back painted glass but the detailing is basically the sameineachcasewiththeallowanceof20mmforeachofthestatedfinishes.Note;urineisthemost aggressive of all substances and detailing and avoidance of porous materials is imperative.

Skirting should be flush at the base (as before) with a shadow gap at the top.

Note that access will be required at high level if a cistern is utilised or at low level if a concealed trap urinal is used. Manufacturers recommended fixing heights are to be followed in all cases as these vary with each type of urinal. Urinal dividers are not usually required.

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ceilings5.9

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Note that no access should be required in the ceiling.

Above cubicles, pre-painted moisture resistant MDF is to be used, which has preformed apertures for lights and grilles and the remainder of the ceiling is to be standard Gyproc mf system either tape and jointed or skimmed.

Detail abutting the two materials by means of a standard Gyproc shadow bead positioned on the centre of the cubicle door.

Alignment of lights, beacons and sounders should be considered.

other walls in toilet area5.10

The starting point for these walls should be painted plasterboard but if design and costs allow, extend hard finishes onto other adjacent walls.

Skirting should be flush at the base (as before) with a shadow gap at the top.

Note that a full height-dressing mirror is often required in each toilet so these are usually positioned on these walls.

There is usually a requirement from the tenant to accommodate vending machines and these should be positioned on these walls with provision for suitable fixing backgrounds.

An industry recognised specialist for the technical support of washroom accessories is Allgood - www.allgood.co.uk


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disabled toilets5.11


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These rooms are designed around basic statutory dimensions notably 2200 x 1500mm internal dimensions.

Finishes should be taken as per the main toilets, complementing all aspects of the selected materials along with all the necessary statutory grab rails, Sanitaryware etc.

As these rooms are so small, a podded construction should always be considered. If a requirement for a shower area to each floor is stated, extending these rooms should be considered.

The Disabled WC should be, ideally, wall hung, complete with a concealed cistern and stainless steel dual flush faceplate (finish can vary).

Sink and tap over to be suited in with the main toilet scheme.

Grab rails and additional fixtures and fittings to be stainless steel.

showers

cleaners cupboards and sinks

5.12

5.13

On floor

Should on floor showers be a requirement it makes sense to enlarge the disabled toilet to incorporate a walk in shower room.

Basement

Where showers are to be provided for cyclists, provision should be made to comply with the Local Authority requirements and that of the targeted BREEAM rating for the development.

Generally, showers shall be provided at a density of 1 per 10 cyclists.

Lockers should be provided at a density of 1 per cyclist

Utilising the disabled toilet layout and provision if necessary can also accommodate provision for multi faith washrooms.

Provision of these is to be made on each core if multi tenant design or one per floor if single tenancy design. Should the cleaner’s cupboard be accessible from a landlord’s area from each tenancy, and then one sink per floor should be considered. Sink to be Belfast type with integral splash back, bib taps and grating with provision for two shelves above.


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sanitaryware5.14


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Ideal Standard Group are considered as Britain’s largest bathroom manufacturer who can and will provide all necessary support, product back up and new innovative ideas whilst providing stability for Developers over the buildings life not just the build period. The following are examples of Ideal Standard ranges but the designer is to check with as to whether supply agreements are in place for specific models..

WC PansWall hung WC pans are the preferred solution and must be installed on the manufacturers proprietary mounting frame within the duct.

Jasper Morrison – Wall Hung Duravit Happy D Wall Hung

Duravit Starck 3 Compact Wall Hung

Duravit Architec Wall Hung

Concept Wall Hung

Concept back to wall

An industry recognised specialist for the technical support of sanitaryware is Ideal Standard - www.ideal-standard.co.uk

White Wall Hung

sanitaryware5.14

Pushbuttons There is a selection of push buttons available to suit Architect preferences and these can be chrome, satin or even colour coated to match panels

Underslung Basins - all with overflow

Alternative Basins (but not necessarily approved)


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Airside Basin

Marlow Washpoint Cherwell Duravit Architec basin with ledgeDuravit Architec basin

IQwallmounted

Leadenhall Basin

Portman Independent Basin


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2.0


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UrinalsUrinals to be cistern fed where possible with either sensor mounted in ceiling or above each individual urinal.

All waste traps should be accessible from the WC accommodation (unless full walk-in access is provided to the rear). Wastes must be white plastic.

Taps - Basin

Taps - Wall mounted

Contour urinal (modified) Jasper Morrison White Urinal Duravit Urinal 082930 Duravit Urinal 082135

Sensorflow 21

Sensorflow 21 Wall

Contour 21 Sensorflow

Melange Aquarius Sensor taps WM

Moments Sensorflow Robert Pearson Sensor taps SS32 Robert Pearson Sensor taps SS45

brassware5.15

Showers - valves

Showers - heads


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Jasper M orrison TTGeometryGlance Ascari Thermostatic

BREEAM rating is a standard policy and consideration to water saving must be a primary objective in the design of the system. Ideal Standard will help in identifying the requirements and advise on all specifics and specifications where necessary.

An industry recognised specialist for the technical support of sanitaryware is Ideal Standard - www.ideal-standard.co.uk

Ellipse Rain Shower Jasper Morrison Overhead Shower Head


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mechanical & electrical

mechanical services

6.0

6.1


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For detailed specification please refer to the relevant section of the Services Engineering Requirements Document.

Hot & Cold Water Services All hot and cold water pipework distribution should, whenever practical, be contained within the accessible riser ducts and should be of copper construction with soldered joints. Where pipework is in view the installation should be of a chrome finish. Hot and cold-water services should be insulated and trace heated and offsite tested when provided as part of the prefabricated offsite walling system or pod.

WC Soil and Waste Soil either in cast iron (preferred), copper, galvanised steel or plastic prefabricated off site and supported on adjustable angle plate system. Cisterns pre-plumbed and tested.

Indicative only

mechanical services6.1


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Vanity/UrinalSoil & Vent should be in plastic prefabricated off site and supported within current wall detailing.

Hot and cold-water services will be lagged and trace heated all off site tested.

Indicative only


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lighting6.2


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Each cubicle and above each urinal shall have a central positioned down-lighter. Same light to appear as main central strip of light but with emergency back-up as necessary.

Each basin to have a single mounted spotlight above.

Above vanity to be lit to design requirements.

Additional feature lighting of cubicle frontage/wall washing/mirror can be utilised but will need to be checked against the relevant cost plan.

The actual selection of light fittings should be from preferred supplier list.

Light fittings to be powered and controlled from the lighting management system.

air conditioning & ductwork6.3

Clean air is to be supplied above vanity units or in lobbies and then extracted above WC’s and urinals by means of return grilles set within ceiling and/or concealed plenums.

Consideration must be given for the ductwork-cleaning regime.


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Indicative only


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metechno approach7.0


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What are we - the offsite advantage • Weareaoffsitemanufacturerwiththeexperienceandthoughtsofacontractor.

• Ourservicesarewideandflexibletosuiteachproject.

• Ourdynamicsalloweachprojecttobefundedandresourcedcorrectlyfortheneedsofall.

• QualityanddeliveryremainsourUSP’s.

• Weofferaftercareandwouldliketobeconsideredaspartoftheteam.

How can we help you? • Wewilllookateachprojectwithanoffsitemindset.

◌• Wearehappytofullydesignaprojectyetonlysupplythe“valueadded”components.

◌• Wewouldliketoshowyouhowtimecanbesavedandutilisedtoyourbenefit.

◌• Wewouldliketoofferan“OPTION”foryoutoconsideratTenderstage.

◌• Wecomefromasubcontractingbackgroundsoarefullyawareofyouneedsandrequirements.

◌• Wecanofferspecialistandspecifictrainingtohelpyourneedsthussavinginpaying “socalledexpensivespecialists”

SUBCONTRAC-

TORS

SUPPLY

CHAIN

CLIENT

METECHNO

SUB

CONTRACTORS CLIENT

SUPPLY

CHAIN



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The premises • 150,000ft2 production facility in Dalbeattie

• Clearopenshopfloorallowingadaptationtoeachproject

• Indepthpoolofexperiencedcraftsman

Design - the key to success• Designoffabricandservices

• BOMfromdesigninformation

• Co-ordinatedservicesandfabric

Design is the key to all projects ensuring that we provide all parties with a fully coordinated, coherent and detailed design for all fabric and services combined. BIM will facilitate this but it it is a process led Technology which we are at the forefront of.


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TECHNO-WALLTM MET W1 . 01 - Wall ModulesOur initial offer to the market uses our previous 10 years of experience in the Washroom Sector.

We offer a prefabricated Modular wall sections bespoke manufactured for each individual project needs. Techno-WallsTM are fully designed to suit logistical requirements and can be broken down to suit a window or lift dimension.

Fully designed to integrate with the surrounding fabric and installed using bespoke plant.

TECHNO-PODTM MET P1 . 01 - Volumetric PodsOur second offer to the market uses our previous 8 years of experience in the Residential Sector.

We offer prefabricated Volumetric Pods bespoke manufactured for each individual project needs in the Residential and Commercial sectors. Pods are fully designed to suit logistical requirements along with the needs and requirements on a site by site process.

Fully designed to integrate with the surrounding fabric and installed using simple plant.



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TECHNO-MODTM MET M1 . 01 - Volumetric Structural ModulesOur third offer to the market will use our combined experience in offsite manufacturing to produce the optimum offsite solution.

We will offer a prefabricated option to the market for specific projects such as Marketing Suites, Hotel Room and Student Bedroom Modules and Volumetric Module bespoke manufactured for each individual project needs. Modules are fully designed to suit logistical requirements along with the needs and requirements on a site by site process.

Fully designed to integrate with the surrounding infrastructure and installed using simple plant.


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2.0


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The offsite advantagesShorter build timesProviding the end user and developer with faster return on investment with potential for early rental or sales income for client, resulting in lower holdings costs.

Predictable build timesWith more controlled project programming, you know what is going to happen and when.

Better build qualityWorking in a clean dry manufacturing environment is far more conducive to the production of a quality product then on a traditional building site. This in turn leads to fewer defects, fewer disputes and happier clients.

Removal of riskThe greatest benefit is the removal of weather and associated onsite delays with an offsite manufacture solution. Secondly, there is generally a time period where material components relating to pods are let. This time delay can result in higher costs, whereas pod costings are fixed at the beginning of the project, potentially avoiding intermediate cost increases. Thirdly, loss or damage remains the responsibility of the manufacturer until onsite handover.

Health & safetyThere are more onsite construction injuries and fatalities in comparison to offsite manufactured components. This is clearly a reflection of a safer single level working environment.

See the finished product - prototypesUpon or prior to award of contract, prototype bathroom (s) are produced and signed off with contractorandclient.Qualityandfinishofproductisagreedatthistimeavoidingdefectsanddisputes at completion of project.

Centralised ControlPurchasing for the head contractor is simplified with one contractor. Buying a number of trades and materials from one source reduces procurement resource time and effort resulting in cost savings.

Less demand on resourcesA reduction of onsite labour requirements in a time of skilled labour shortages enables subcontractorstoutilizetheirworkforcemoreefficientlyinopenspaces,ratherthancongestedspaces.Handoverdefectsareminimized,withclientapprovalssignedatthefacilityandpriortohandover.Materialandlabourmovementsinhoistsandtowercranesareminimized.Onsite welfarefacilitiesareminimized.

Less construction disruption

Work onsite is safer, quieter and cleaner. Potentially up to 90% fewer vehicle movement’s onsite, which assists with less disruption around the sensitive worksite


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The offsite advantages

Why is it green?Factory manufacture is inherently less wasteful than traditional forms of construction and thus moresustainable,specifically;

• Fewerdeliveriestosite,meaninglessnoise,dustanddisruption.

• Lowerwastetolandfillreducingonsitewasteremovalanddisposalcosts.

• Factorywastematerialistypicallylessthan1.5%comparedwith7%+onatraditional construction site and recycling of waste is more reliably controlled in a factory environment than it is onsite.

• Factoryoperativesareupto250%moreefficientthanthesameactivitycarriedoutonsite.

• RecentLife-cycleanalysishasdemonstratedthatoffsiteconstructionmethodsreducethe overall impact on the environment by at least 40%.

Decision makingEarly decision making is required regarding the build method and exact specification requirements, which is traditionally not completed at the initial design phase.

A greater level of coordination is required at the procurement stage to ensure the offsite packages integrate correctly with conventional building elements. Ideally, Architects and Consultants need consultation with the offsite manufacturer early in design stage.

Changes during the manufacturing process can impact on time and cost to the project.


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2.0


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client’s notes page

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Metechno Limited

4 Station Road

St Neots

Cambridgeshire

PE191QF

T 01743 290050

E [email protected]

www.metechno.co.uk


Washroom guide

Documents

o g ymetechno1

permissionl e

female ratio

air changes

o g ymetechnocore layouts2

metechno approach

supply air ventilation

design of washrooms