Uspan Ufloors Uchoices - Nu-span ::: Precast Insulated · PDF fileWhat is ? Nu-span is a high performance, precast, insulated slab system for application in the construction of suspended

Uspan Ufloors Uchoices

U-span.com


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What is Uspan? 2

Why Use Uspan? 3

Who we are 3

Thermal Efficiency 4

Environmental 5

Accreditation & Quality 6

Technical Support 7

Product Range 8

Design Considerations 12

Technical Data Sheets 14

Precast Stairs 17

Hollowcore Flooring 18

What is ?Nu-span is a high performance, precast,insulated slab system for application in theconstruction of suspended ground floors indwellings and smaller-scale commercialbuildings. It is manufactured in precision made steel moulds to stringent quality standards. The composite unit comprises structural grade reinforced concrete bonded to high performance expanded polystyrene (EPS).

Nu-span was developed to meet the nextgeneration of building regulations and canachieve U-Values as low as 0.08 W/m2Kdepending on the perimeter/area ratio andinsulating material chosen. This allows the

Why use ?Thermal Performance

- The Unit provides a continuous unbroken layer of EPS material across the entire floor achieving U-values as low as

0.08 W/m2K.

- A significant reduction in cold bridging is also achieved resulting in attractive Psi (ψ) values as demonstrated in the

technical data sheets.

- A choice of insulating material is available (type and thickness) to help achieve maximum thermal performance and energy rating for any building and assist in meeting the required specification.

- “Built-in” benefits with maintenance free high U-values through an essential element of the building fabric achieving increasing standards required by Building Regulations.

- Concrete is one of the most versatile, durable and cost effective building materials available. It is also environmentally sustainable with green credentials that outperform both steel and timber and, when combined with EPS, offers a floor system that significantly reduces the carbon footprint of any construction. This is recognised by a BREAMM rating of A+.

Composite UnitThe Nu-span Unit combines the three essential elements of any suspended ground floor: the structural element, the insulation and the screed.

This arrives on site as one factory made unit with the following benefits:

- No on-site storage issues for either insulation or the other components providing both a practical and an environmental benefit;

- The insulation element is fitted to the Nu-span Unit in the factory thus removing the performance risk associated with the manual fitting of insulation materials on site (Actual performance in this regard is likely to be an increasing area of focus in forthcoming building regulations);

- No further screed is required when using a timber batten floor and only a self-levelling compound is required for other finishes when using NS30 and NS38 Units.

Efficient & Cost Effective- Installation is carried out by experienced

erection crews. Up to 400m2 per day can be safely installed leaving an immediate safe working platform for follow-on trades.

- CDM Compliance - The use of Nu-span designs out the risks associated with manual handling, trips, slips and falls thus considerably improving on-site Health & Safety. The Units are installed by experienced and certified erection crews.

- No on-site material waste with associated cost benefits and reduced storage requirements.

- All-weather construction – fitting is not restricted by adverse weather conditions.

Nu-span Flooring Limited boasts an excellent management team with decades of experience in the concrete product and thermal insulation markets.

Given previous experience of the UK construction market, the Nu-span team is very focussed on the requirements of its customer and has made a considerable investment to ensure that attention to detail is delivered. This is evident not only in terms of design and manufacture, but also regarding logistics for delivery and installation, ensuring an unrivalled level of customer service from initial design to final installation.

Operating from a modern manufacturing facility in Brandon, Suffolk, Nu-span has invested in custom designed manufacturing technology and production process control systems, including full traceability,

to ensure that the Nu-span product will meet the exacting standards that customers require on a continuous basis. The experienced Nu-span team is also available to carry out installation of the

product resulting in a comprehensive solution for customers.

Nu-span has been designed to have many benefits over traditional ground floor construction methods.

Who we are


building designer greater flexibility whenspecifying other elements of the building inorder to achieve the required Target Emissions Rating (TER) or to achieve highly energy efficient buildings.

Nu-span is the ideal solution for suspendedground floor levels in domestic housing andsmaller scale commercial buildings,particularly where customers are seeking athermally efficient method of construction. Atthe same time, due to the off-sitemanufacturing process, Nu-span provides fast on-site construction allowing the follow-on trades to get on site in as little as three hours for a typical detached house.

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Nu-span NS30 and NS38 Units offer excellent thermal performance which is provided bybonding EPS material to the underside of the precast unit.

As well as offering excellent insulating properties, and extensively reducing cold bridging, the advanced design and material composition of the system makes a positive contribution to the reduction in CO2 by decreasing the amount of fossil fuel required to heat the building.

The thermal performance of each project is assessed in accordance with EN ISO 13370:1998 to ensure compliance. In addition:• U- Values as low as 0.08 W/m2K can be achieved depending on the P/A ratio;• Substantial thermal mass;• A significant reduction in thermal bridging is achieved;• The Nu-span Technical Team is available from design stage to discuss advantages and

application of the Nu-span floor system; and• A choice of products is available depending on your budget and requirements.

Thermal comparison with traditional solutionsForming suspended ground floors with conventional T-Beam and Block construction methods makes it difficult to achieve the high standards of thermal performance necessary to comply with Building Regulations. Some improvement in performance is possible by replacing the concrete blocks with EPS insulation units which are specifically shaped to make contact beneath the beams with an aim of providing a continuous layer of insulation.

However, even slight irregularities in setting-out can result in breaks in the insulation layer,leading to air movement around the units and increased heat loss. In addition, the perimeterof such systems is generally formed with concrete blocks with only a thin layer of insulation fixed beneath. This inevitably downgrades the performance of the complete floor.

Thermal EfficiencyJunctions The stringent requirements for energy efficient buildings means designers must consider not only heat loss which occurs through building elements (expressed by their U-values) but also the heat loss which occurs at the junctions between building elements, such as the wall-floor junction.

One of the key factors in minimising heat loss at junctions is ensuring continuity of insulation at the junction. This is difficult with conventional suspended floor constructions, as the floor insulation stops at the internal face of the wall and the insulation is often in the wall cavity.

Nu-span NS30 and NS38 Units reduce heat loss at the wall-floor junction. Because the units bear on the inner leaf of cavity walls, the insulation extends beyond the floor to the face of the wall cavity. The insulation within the cavity then butts that on the Nu-span Unit to give continuous insulation across the junction.

The Advantage• Nu-span NS30 and NS38 maximise the thermal performance of

ground floors by forming a deep, unbroken layer of insulation across the entire floor;

• The design of Nu-span NS30 and NS38 Units minimises the thermal bridging effect of the structural concrete to give a high thermal resistance for the suspended floor;

• Within the NS30 and NS38 units the structural concrete is cast onto the insulation, avoiding air gaps and therefore minimising heat loss by air movement;

• The insulation on each Nu-span NS30 or NS38 Unit is continuous and the Units are butted with their insulation layers tight together, thus avoiding gaps in the insulation layer; and

• Nu-span NS30 and NS38 Units cover the entire floor area, providing the same performance across the entire floor.

ConcreteConcrete is one of the most versatile, durable and cost effective building materials available. It is also environmentally sustainable with green credentials that outperform both steel and timber and, when combined with EPS, offers a floor system that helps reduce the building’s carbon footprint.

EPSThe energy used in the production of EPS (embodied energy) is saved many times over throughout the life of the building in which it is installed. Initial recovery is estimated to be within the first 15 years, thus reducing your dwelling’s carbon footprint.

The green credentials of EPS are unsurpassed.

- Zero Ozone Depletion Potential (“ODP”) as the blowing agent used in the expansion process is Pentane which does not affect the Ozone layer;

- Zero Global Warming Potential (“GWP”) – 1 credit score towards the

overall code level rating;- Green guide summary rating of ‘A+’;- Credit score of 3 for the floor element in

the code for Sustainable Homes;- CFC and HCFC free;- 98% air;- Contains recycled material;- Fully recyclable

EnvironmentalFire ResistanceThere are no fire resistance requirements needed when the Nu-span system is used on the ground floor of domestic houses.

DurabilityNu-span Units are dimensionally stable, resistant to attack from rodents (it has no nutritional value), bacteria, mould and fungi and have a lifespan comparable to that of the building. EPS insulation is a non-irritant and is non-toxic.

OperationNu-span manages its business in order to minimise its impact on the environment in accordance with the ISO 14001 Quality Management Standard.

Responsible SourcingNu-span is committed to providing products which have the lowest carbon footprint achievable. To this end the Company has structured its raw material supply arrangements to assist in this goal.

The concrete utilised in the manufacture of Nu-span products is manufactured on-site by a supplier which conforms to the following standards:

- Environmental Management System - ISO14001:2004

- BES 6001 – Framework Standard for the Responsible Sourcing of

Construction Products• The EPS supplier conforms to the

following standards: - Environmental Management System -

ISO14001:2004

In addition, the Nu-span product itself generates no waste on-site, and is efficient to transport and install as its design facilitates transporting and off-loading from the same lorry, normally with no requirement for additional material handling equipment.

Surplus Raw Material RecyclingNu-span is committed to ensuring that any raw material which is surplus to its production process is managed in an environmentally sensitive manner. In this regard the Company has the following initiatives in place:

• All surplus concrete product is fully recycled through a dedicated recycling plant on-site.

• All surplus EPS insulation is returned to the supplier and is fully recycled.

• All surplus steel is collected by a local licenced recycling agent.


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CertificationNu-span has received accreditation from the British Board of Agrément under BBA Certificate No. 13/4967. A copy of this certificate, together with details of its application to Nu-span’s products, is available on the Nu-span website. Structural and thermal calculations have been performed by professionals suitably qualified in their particular fields.

Building RegulationsNu-span complies with the following regulations:

• Building Regulations Part L, England & Wales

• Building Standards Section 6 (formerly part J), Scotland

• Building Regulations Part L, Republic of Ireland

• Building Regulations Part F, Northern Ireland

NHBCThe Nu-span precast insulated concrete floor system is accepted by NHBC in relation to NHBC Standards, Chapter 5.2 Suspended Ground Floors.

QualityNu-span Units are manufactured in accordance with ISO 9001 Quality Management Standards. The Units are designed to BS EN 1992-1-1:2004 Eurocode 2 and BS EN 13224:2004 Precast Concrete Products – Ribbed Floor Elements.

Sustainable HomesNu-span’s flooring system range can significantly contribute towards achieving the Code for Sustainable Homes levels 4-6 as well as Passivhaus standard.

The thermal performance of each project is assessed in accordance with EN ISO 13370:2007 to ensure compliance.

Accreditation & Quality

QuotationNu-span prepares detailed quotations on all enquiries. Our technical team will liaise with your architect/engineer/QS to discuss details and costings to establish the best solution given your project requirements.

We will provide a detailed foundation drawing confirming where additional foundation walls are required or where foundation walls can be eliminated to reduce costs

Design ServiceNu-span Units are specifically manufactured to customer specifications and requirements. In this regard Nu-span offers a comprehensive service to ensure that all technical queries are dealt with in a timely and professional manner thereby ensuring that your design or build progresses as smoothly as possible.

Should you require any further detailed technical assistance in any area, please contact the Nu-span Technical Team at [email protected]

“The drawings and details I received from Nu-span for our development at Drayton were of good, clear quality. Our point of contact at Nu-span, was always very helpful and quick to respond to any of my queries. If any amendments were required to the plans, I would have a response back within days, if not the same day. From a design and technical point of view, the overall service was of a high standard and I would have no qualms about working with Nu-span on future developments”.

Tom GoodallProject TechnicianChurchill Retirement Living.

Technical SupportDeliveryPrior to delivery, Nu-span shall contact your site-representative to confirm all details for delivery. This will include checking access, obstructions and bearings.There will be detailed lift plans and method statements prepared for each installation.

InstallationThe Nu-span installation crews are available to install the Nu-span units. With its all-weather construction capability, up to 400m2

of Nu-span can be safely installed per day leaving a safe working platform for follow-on trades.

GroutingAll Nu-span units are grouted on-site by our experienced installation crews using C25/30 sand cement mortar.

Service openings facilitatedDirect installation

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Product RangeNu-span flooring has three insulated ground floor slabs:

• NS38-300

• NS30-300

• NS30-375

All standard units are 1200mm wide, with narrower slabs made to required width to fill the overall building dimensions.The units offer differing thermal properties, depending on your requirement, we can achieve a floor u-value as low as 0.08W/m²K.

The structural strength of the unit comes from the reinforced ribs, one down either side. The unit is manufactured by pouring concrete onto profiled polystyrene (EPS). The EPS provides for a complete layer of insulation under the floor broken only by the bearing points (stools):

• Endbearing-4no,andifrequired• Sidebearing-at600mmintervals.

Nu-span flooring offers bespoke precast concrete stairs and landings to satisfy individual customer requirements.

Nu-span flooring offers a range of prestressed flooring for first and subsequent floors or where a more demanding load requirement is a necessity.

P/A Ratio U-value P/A Ratio U-value

0.1 0.16 0.6 0.20

0.2 0.16 0.7 0.20

0.3 0.18 0.8 0.21

0.4 0.19 0.9 0.21

0.5 0.19 1.0 0.21

Product NS38-300Depth 300mm

Self-weight 2.1kN/m2 214kg/m2

Thermal resistance 3.622m2K/W

Psi (Ψ) Valuesend bearing: 0.16W/mK

side bearing: 0.13W/mK 1.0

NS38-300 Load/Span Table

Live Load (kN/m²) 1.5 2 2.5 3 3.5 4

Max. clear span (m) 7.0 6.3 5.7 5.2 4.8 4.5

An allowance has been made for 2.1kN/m² and 1.18kN/m² for self-weight of unit and 50mm screed respectively in compiling the above load span table.

Whilst every care has been taken in compiling the above tables, they should be used as guidance only and should not be used as a basis for specific design.

Please contact our technical department to discuss any specific project requirements.

“We have found the service offered by Nu-span to be both professional and efficient. Our design team has worked with Nu-span for several years and the product ticks all of the boxes. It is a fast fit flooring solution without the need for further screeding which means reduced programme times.”

Matt Drew Contracts ManagerFoster Property Maintenance Ltd

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0.1 0.12 0.6 0.14

0.2 0.12 0.7 0.14

0.3 0.13 0.8 0.15

0.4 0.14 0.9 0.15

0.5 0.14 1.0 0.15




Psi (Ψ) ValuesEnd bearing: 0.15W/mK

Side bearing: 0.13W/mK 1.0


Live Load (kN/m²) 1.5 2 2.5 3.0 3.5 4.0

Max. clear span (m) 7.0 6.3 5.7 5.2 4.8 4.5

An allowance has been made for 2.1kN/m² and 1.18kN/m² for self-weight of unit and 50mm screed respectively in compiling the above load span table. Whilst every care has been taken in compiling the above tables, they should be used as guidance only and should not be used as a basis for specific design. Please contact our technical department to discuss any specific project requirements.


0.1 0.08 0.6 0.11

0.2 0.09 0.7 0.12

0.3 0.10 0.8 0.12

0.4 0.11 0.9 0.12

0.5 0.11 1.0 0.12




Psi (Ψ) ValuesEnd bearing: 0.06W/mK

Side bearing: 0.04W/mK 1.0


Live Load (kN/m²) 1.5 2 2.5 3.0 3.5 4.0

Max. clear span (m) 7.0 6.3 5.7 5.2 4.8 4.5

An allowance has been made for 2.1kN/m² and 1.18kN/m² for self-weight of unit and 50mm screed respectively in compiling the above load span table.

Whilst every care has been taken in compiling the above tables, they should be used as guidance only and should not be used as a basis for specific design. Please contact our technical department to discuss any specific project requirements.

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Ground Floor- Design Considerations

Floor finishes Various options are available for floor finishes;

a. Nominal self-levelling compound

b. 40-75mm sand/cement screed

c. 40-75mm flo-screed over underfloor heating pipes

d. 50-100mm structural screed- if required to accommodate specific loading requirements.

Ventilation To help minimise the risk of condensation, a void space should be maintained between the lowest point of the floor and ground to a depth of at least 150 mm.

Provision for adequate through ventilation, in the form of ventilation openings should be provided in two opposing external walls. The ventilation openings should be sized at not less than 1500mm²/m run of external wall or 500 mm²/m² of floor area, whichever is greater.

Where pipes are used to carry ventilating air, these should be at least 100 mm diameter.

Service openings Service penetrations for water inlet, waste drainage, gas pipes and other services can be easily accommodated within the ground floor slabs.

All service openings are formed during manufacture and their position/sizes must be agreed at design stage. Standard opening sizes are 200mm x 200mm square, although larger openings can be accommodated by consulting our technical department.

Openings cannot be accommodated within the reinforced rib of the unit (where this is necessary please consult the technical department to discuss an alternative solution).DPM to architects specification.

Bearing details Nu-span Units require 100mm end bearing on masonry walls. In order to provide the best thermal performance we recommend that all units’ side-bear onto the inner leaf of the cavity wall running parallel to span.

We recommend that supporting foundation block work has a compressive strength of 7N/mm².

Partition Walls Nu-span Units can accommodate non-load bearing stud and block partitions built directly off the slab provided these have been allowed for at design stage and detailed on our CAD layout drawings. Additional loadings can be accommodated by applying a structural screed.

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“Nu-span Flooring Ltd has been employed by Westridge Construction Ltd on numerous housing projects to carry out the design, manufacture, supply and site installation of their insulated precast floor slabs. Their system provides a totally flat floor with guaranteed thermal and structural performance. The superstructure works can commence the day after the floor has been installed and as there is no need for additional insulation or screed we have no drying-out time issues. The Nu-span Flooring team always work closely with our project team and designers to ensure that the on-site installation is carried out in an efficient and safe manner and in accordance with our construction programmes.The floor slabs provided have always been of high quality and we look forward to working with Nu-span Flooring Limited in the future as a key member of our supply chain to meet the needs of Westridge Construction Ltd and our clients.”

Paul M DohertyBuyerWestridge Construction Ltd

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GSPublisherEngine 329.52.57.100

Floor Finish

Concrete screed (if required)

NS30-375 unit

DPC under side of slab, folded upto underside of inner leaf built off slab

Masonry cavity construction

Cavity wall insulation toextend 150mm belowbase of slab

Telescopic vent

150mm minimum ventilated void

Floor Finish


NS30-375 unit



Telescopic vent



Floor Finish


NS30-375 unit




Telescopic vent


S-01Section Masonry

S-073D View Masonry

S-01End Bearing Masonry

GSPublisherEngine 329.51.56.100

Floor Finish

Self-levelling compound

NS30-375 unit


Timber frame

25mm PIR insulation extending100mm above soleplate and 150mm below base of slab

Telescopic vent

Floor Finish



Timber frame

25mm PIR insulationextending100mm abovesoleplate and150mmbelow base of slab

Telescopic vent


NS30-375 unit

Floor Finish



Timber frame

25mm PIR insulationextending100mm abovesoleplate and150mmbelow base of slab

Telescopic vent


NS30-375 unit

S-013D View Timber Frame

S-01Section Timber Frame

S-02End Bearing TF

Masonry Data Sheet Timber Frame Data Sheet


Non-screeded RangeNu-span also manufactures all of its insulated product range with a high-spec surface finish in order to give customers a choice as to the application/non-application of a finishing screed. As the Nu-span floor system is not pre-stressed, units do not have the upward camber associated with floors constructed using the T-Beam method, thus allowing the use of minimal-depth self-levelling compound.

With an improved surface finish and negligible design deflection, the Nu-span non-screeded range of floor units demands only the minimum depth of levelling compound prior to direct placing of carpet, floor-tiles, wooden floors or vinyl. Significant cost savings can be achieved by eliminating the need for a conventional screed.

Our technical department will be pleased to deal with any queries or advice you may seek regarding these products and the additional considerations we give to the installation of same.

Ready for follow-on trades

Easy application of self leveling compound

Precast Stairs & Landings

Precast concrete staircases and landing units are manufactured to bespoke configurations to satisfy individual requirements.

Stairs are manufactured using only the highest quality materials resulting in a Type ‘A’ finish for soffit, risers and sides as defined by Eurocode 2.

The advantages of using precast stairs and landings include:

• Areductionofon-sitelabour

• Speedofinstallation

• Immediateandsecureaccesstoupperfloor levels

• Increasedsitesafety

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Imposed Live Load

Depth Self-Weight 1 2 5 10

Allowable clear span (m)

150mm 2.3kN/m² 236kg/m² 7.3 7.3 6.9 5.5

150mm High Density 3.0kN/m² 306kg/m² 7.3 7.3 6.7 5.4

200mm 3.0kN/m² 306kg/m² 9.8 9.8 8.8 7.1

250mm 3.5kN/m² 357kg/m² 12.3 12.3 10.7 8.6

300mm 4.2kN/m² 429kg/m² 14.8 14.5 12.7 10.3

320mm 4.5kN/m² 459kg/m² 14.8 14.8 13.7 11.2

400mm 5.4kN/m² 551kg/m² 17.3 17.3 16.3 13.4

“We find Nu-span provide a highly professional service from design through to installation. The product is effective, quick to fit and economical in cost. They provide fast responses to any queries raised by us or the Statutory Authorities. We have used them on many occasions and would look to use them in the future based upon our past experiences.”

Claire Hutcheson Technical Co-ordinatorFoster Property Maintenance Ltd

Hollowcore Flooring

Hollowcore flooring is used for situations where a more demanding load requirement is a necessity.

All units are manufactured utilising 150 metre long steel beds within an enclosed factory environment employing the latest slip forming technology. Units are manufactured in standard widths of 1200mm with depths of between 150mm and 400mm available and comply with the latest British and European standards. All Units can be manufactured in narrower widths in order to accommodate overall dimensions required. High tensile steel wire or strand is used for the pre-stressing tendons in various configurations to suit particular span and design loadings.

The standard pre-stressed Units supplied by Nu-span are designed for moderate exposure conditions and to meet the serviceability criteria of class 2 members. Units have a minimum fire resistance of 1 hour. However, modified sections can be supplied to achieve up to 3 hours fire resistance if required. The Units are manufactured with a type ‘A’ soffit finish as defined in Eurocode 2.

“Nu-span provided a professional and helpful service. Potential problems were discussed and resolved in a Pre Start meeting and when site installation was commenced the procedure agreed in the start meeting worked and was adhered to.Installation was precise and neat and any small matters were easily resolved on site.Quality of products was great and we were happy with the end result”.

James DemelSite ManagerWestridge Construction

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Should you require further information, or need to request any of our Technical Data Sheets, please do not hesitate to contact us

[email protected]


104265 www.theprintfactory.com t.02866 325 325

U-span.com

Copyright U-span Flooring Limited 2015 ©

Production Mundford Road, Weeting, Brandon, Suffolk, IP27 0PL

Contact Us

t. 01842 810445 info@ U-span.com

Technical Services

t. 028 677 48777technical@ U-span.com

Documents

Uspan Ufloors Uchoices - Nu-span ::: Precast Insulated · PDF fileWhat is ? Nu-span is a high performance, precast, insulated slab system for application in the construction of suspended