Xella Ytong2019-09-11T15:02:13+00:00

Xella Ytong, large format masonry blocks and full height wall panels

The Xella Ytong blocks are aircrete thin joint systems made from sand an lime. The Ytong Casco Storey Height Wall Panels manufactured to storey height.

The MFS Xella Ytong Systems

Xella Ytong Thin Joint Blocks and Casco Storey Height Wall Panels are manufactured in the same way as the Xella Silka Elements. The blocks however are smaller in size and because they are aircrete are substantially lighter – which suits some projects.

As with the Xella Silka Element System the key benefit is the speed of construction. Fast, accurate and clean the Xella Ytong system uses special fast drying mortar which sets within 1-2 hours, so no need to wait for the conventional 24 hours before further loading can be applied to the walls.

MFS as part of your design team

We consider every project on its own merits and offer to take Design Responsibility for the whole of the Structural Envelope from oversite and more importantly provide you with a Design Warranty. That way we are able to rationalise our approach and provide the client with the comfort of a ‘tried and tested’ solution with a single point of responsibility.

Xella Ytong System Facts

  • Composition: Aircrete blocks made from sand and lime, they are lightweight, easy to work with and have a high resistance to thermal fire, frost, water penetration and sulfate attack.
  • Dimensions: The Ytong Thin Joint Blocks are typically 600mm x 215mm x 100mm. The Casco full height wall panels are of similar composition and are manufactured to storey height requirements.
  • Thickness: Xella Ytong blocks are manufactured in a range of widths. We tend to specify the 100mm wide for the inner leaf of cavity walls, also party walls and 190mm wide for solid wall construction.

  • Cost: The Xella Ytong thin joint block system is comparable with traditional masonry solutions, however it is substantially quicker in delivering a complete structural envelope, in fact halving a ‘traditional’ build programme.
  • Offsite lead time: A typical lead time on the manufacture is approx. 6-8 weeks.
  • On site delivery time: We can typically complete a pair of semi-detached house in around 10 working days.

Key Construction & Building Benefits

  • Substantially quicker and more cost effective than traditional masonry.
  • Conventional construction with added speed & efficiency benefits
  • Excellent thermal and acoustic Performance and fire retardant properties
  • Able to meet Approved Document A3 Disproportionate Collapse Class 2A

  • Reduced Waste and lower defects, either during the manufacturing process or on-site!
  • Improved air-tightness
  • A unique MMC solution which meets demands of today’s housing industry, with the resistance of Solid Masonry and PCC Concrete.
  • MFS offer a Structural Design Solution and Warranty. Our early involvement in the design and planning can reduce costs and time on site.

Xella Ytong Large Format Blocks – Frequently asked Questions

Which services are MFS able to offer?2019-04-02T09:51:41+00:00

We originally established the business to build the inner leaf of the superstructure from oversite right up to wall plate level and then pitch the roof structure, including the installation of the intermediate floors. However, as the building process becomes increasingly complex, we now find ourselves invariably undertaking the whole of the structural envelope, including the external leaf, managing and coordinating the scaffolding, installing any structural steelwork and PCC floor planks. We even supply the forklift and fit the soffit and fascia too.

How quickly can MFS erect the frame?2019-04-02T09:50:25+00:00

Essentially, we can build a typical pair of semis from oversite to watertight in 10 working days; and depending on the scale of the project and the desired handover rate, we can complete a pair of units every five working days thereafter. After that, it is just a question of adjusting the resource levels.

What is the lead time on the MFS systems?2019-04-02T09:42:08+00:00

Depending on the scale and level of complexity of your project, the average lead time would be in the order of six to eight weeks. However, to benefit fully from the system, we recommend that you get involved in the design process as early as possible in order to maximise the potential savings.

How expensive is thin joint Construction?2019-04-02T09:36:50+00:00

In a recent study undertaken by Calford Seaden, it was concluded that the thin joint blockwork solution at Code Level 3 was 8% cheaper than either the equivalent timber frame or SIPS panel solution. We would further argue that when adopted as part of an integrated design solution, at Code Level 4 the savings or benefits are even greater when you factor in the elimination or reduction in renewable technologies.

What strength blocks are used for thin joint construction?2019-04-02T09:35:04+00:00

Thin joint blocks are manufactured in all of the standard aircrete block strengths 2.80 N/mm2 Solar, 3.60 N/mm2 Standard and 7.30 N/mm2 Hi Seven, together with a few 10.30 N/mm2 Hi Tens. The principal difference is the accuracy and format of blocks. We tend to specify the Jumbo Plus format, which is 610mm x 270mm and manufactured to high degree of accuracy +/- 1mm.

Can MFS meet the latest Code for Sustainable Homes?2019-04-02T09:33:04+00:00

Yes, thin joint blockwork is recognised as a Modern Method of Construction and is widely adopted to meet both Code Level 3 and Code Level 4 of the CfSH (Code for Sustainable Homes). It can also be adopted for PassivHaus construction; in fact it makes an ideal structure because of its thermal mass properties.

How does thin joint compare to ‘timber frame’?2019-04-02T09:31:06+00:00

Essentially, it is a masonry alternative to timber frame. It offers most if not all of the benefits of timber frame, with the added robustness of solid masonry. It also has the benefit of increasing the thermal mass, which is an important factor in PassivHaus construction and increasingly recognised as a significant factor in personal comfort.

What is thin bed blockwork?2019-04-02T09:53:19+00:00

Thin bed, or thin joint blockwork as it is commonly known, is a large format block system manufactured to a higher standard of accuracy than conventional aircrete blocks. It uses a specialist high strength adhesive laid to a 2mm thick bed.

MFS Xella Ytong Element System Construction Projects

Thin Joint vs Traditional Brickwork

Thin joint mortar can be laid in freezing conditions, minimising construction delays in the colder months.

Thin joint mortar is fully load bearing in 24hours, whereas traditional brick mortar can take up to 28 days before it is completely structurally sound.

Thin joint mortar uses much less than a litre of water per square metre. A massive saving in water consumption compared to traditional mortar, which uses 16 litres.

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