Archive for category: Building News

With three key projects under the spotlight, we hear more about Spantherm – the innovative insulated precast concrete ground-floor system which is being adopted by a growing number of housebuilders and developers in GB.

By producing high performance insulated structural concrete units offsite Creagh have redefined the speed of installing a fully insulated ground-floor.  Spantherm is an efficient alternative to labour intensive beam and block installations. It has been utilised at a housing development in Peterborough by NRI Civils who opted for the work to be completed by Creagh’s expert fitting team, requiring no labour from them and saving them time onsite.
Adam Moody, Contracts Manager for NRI Civils said: “We chose Spantherm because one of the things that we are looking for as a business is to improve efficiencies, reduce costs, reduce labour and time onsite and when you’ve got a difficult site, where you’re struggling for storage, that’s exactly where Spantherm is perfect!”
Spantherm’s initial appeal is clear, as a typical floor on a detached house or a pair of semi-detached homes is fitted onsite in less than two hours. Once in place and grouted, the floor achieves its full structural capability within 72 hours, however building activity can commence on perimeter walls within 24 hours. “The team have been absolutely fantastic” adds Adam. “They are always on hand for technical support. We will definitely be using Spantherm again to help our optimum goal of achieving better efficiency and reducing costs and labour times.”
Spantherm has also been used in Nottinghamshire, where a new homes development is being built by Geda Construction. With no additional site works or laying out required, a typical 90m² floor can be installed in just 90 minutes and provides level base without camber for timber frame or block construction.
Installation is not affected by adverse weather conditions and secondary screeds with extended drying times are not required. Spantherm is designed to reduce cold bridging at wall / floor junctions making an important contribution to Part L performance, whilst achieving U-value as low as 0.11W/m2K.
“Geda used Spantherm to push the project along as its one operation that just makes it so much quicker and easier to facilitate onsite,” said Shaun Wormall, Site Manager for Geda. “We are impressed on the installation of the slabs and the time that it saves us onsite. From a site management point of view it’s been really good, Creagh have been very responsive and the production timescales and installation has been quick and painless.  We would definitely use Spantherm again, brilliant product, well-managed and well-run.”
An increasing number of builders in GB are switching from traditional beam and block builds as its significantly reducing labour onsite.  Malcolm Flinn, Director of Stapleford Oaks Ltd in Nottingham states “I chose Spantherm because it’s labour saving, has made life easier for me, its quick, efficient and clean”.
“I would use Spantherm again because the block and beam method takes so many more men and machines on site, and takes a lot longer
to lay.  It also leaves a lot of work for the bricklayers to do at floor level.  With Spantherm we are in and building off it almost straight away” stated Malcolm.
Watch the testimonial videos at

www.creaghconcrete.co.uk

By Carl Davison Technical Services Manager at Kingspan Industrial Insulation.

Thermal comfort has become the focus of increasing attention in recent years as designers and project teams look to create a healthier built environment. Whilst the enhanced thermal performance and airtightness provided by some offsite envelope solutions can help to make indoor conditions more easily controllable, careful attention must also be paid to potential heat sources within a space which can lead to overheating. Research from AECOM has now shown that pipe insulation specification can have a major bearing on how easily properties overheat, as well as on their overall energy demand.

Requirements
The minimum insulation requirements when specifying hot water and heating systems are contained within the Domestic and Non-domestic Building Service Compliance Guides1. For optimal system efficiency, however, the Energy Technology List (ETL) recommends a higher performance pipe insulation specification based on NES Y50 Enhanced levels.
A wide range of pipe insulation options are now available and a key differentiator between these is their thermal conductivity. Insulation materials with a lower thermal conductivity are more effective at preventing heat transfer through conduction, meaning a reduced thickness can be used to achieve the desired level of insulating performance. Premium phenolic pipe insulants are amongst the most thermally efficient options, with a 25-year aged thermal conductivity as low as 0.025 W/m·K (at 10°C mean), and are available with phenolic insulation pipe supports to further minimise heat losses.

Research
To investigate how these different specifications can affect overheating and system performance, AECOM carried out a detailed evaluation using IES dynamic thermal modelling. The research assessed the performance of three insulation systems on LTHW (Low Temperature Hot Water) and DHW (Domestic Hot Water) pipework, within a multi-unit residential extra-care building with a constant circulation of hot water:
1   Man Made Mineral Fibre (MMMF) Pipe insulation specified to BS 5422: 2009 with rubber lined pipe support brackets.
2  Phenolic pipe insulation specified to minimum standards within BS 5422: 2009 with phenolic insulation pipe support inserts.
3  Phenolic pipe insulation to the enhanced
ETL specification with phenolic insulation pipe support inserts.
The study also considered the use of extraction fans to dissipate heat.

Results
To evaluate the impact of each specification on overheating, AECOM calculated the percentage of hours with a dry resultant temperature of greater than 25°C2 and 28°C3.
The results showed that, when compared with the MMMF system, the BS 5422 phenolic specification provided a reduction of up to 15% in overheating hours at a room temperature greater than 28°C, and up to 9% at a room temperature greater than 25°C.  The ETL specification offered significant further benefits with falls of up to 32% in overheating hours greater than 28°C, and 25% in overheating hours over 25°C.
In some scenarios, the modelling showed that rooms with the MMMF specification would have experienced over 100 additional hours at temperatures above 28ºC when compared to the ETL specification.
These reductions also produced considerable energy cost savings. The projected average energy cost of the MMMF specification was calculated at £3,973, rising to £4,105 when the impact of additional extraction fans was considered. The BS 5422 phenolic specification achieved annual savings of £431 or £463 depending on whether the impact of extraction fans was taken into account. With the ETL phenolic specification even greater savings of £1,252 and £1,384 could be achieved.
Finally, the study showed that when the extract fans were considered, the ETL specification would have an immediate payback.

In control
The move towards a healthier, more energy efficient built environment requires project teams to think more holistically about how all of the elements will interact. As the AECOM research shows, by paying close attention to areas such as pipe insulation specification, it is possible to achieve considerable reductions in both energy demand and overheating hours.

www.kingspanindustrialinsulation.com

1  This expands on the specifications within BS 5422: 2009 (Method for specifying thermal insulating materials for pipes, tanks, vessels, ductwork and equipment operating within the temperature range -40°C to +700°C)
2  The recommended acceptable indoor design operative temperature within CIBSE Guide A 2006
3 The preferred maximum temperature for thermal comfort

Buildings need to come together more quickly than ever. To do so without compromising integrity and quality depends on every little detail being thoroughly considered. This detail comes right down to the fasteners and fixings that hold the building envelope together, explains David Fraser, NVELOPE® Business Unit Manager at SFS UK.

Almost everywhere you look in the field of construction, there is talk of needing to build faster and more efficiently. Whether it’s because there’s a lack of crucial infrastructure, or simply because there’s not enough labour, it’s evident that we need to streamline our approach to construction.
This is clearly evidenced by the UK’s housing shortage crisis. In 2018, it was estimated that England had a backlog of 3.91 million homes, meaning 340,000 new homes need to be built each year until 2031. Yet at that time, the government was only targeting building 300,000 homes annually, and any shortfall only further compounds the problems.
However, as the old saying goes, haste makes waste, and this couldn’t be truer for buildings. Structures that are not planned out and correctly specified can cause waste from construction right through to building operation. For example, poor specification can lead to unnecessary servicing and maintenance, and needing to replace materials that don’t meet their expected lifespan.
To ensure that we can maximise construction efficiency, while still maintaining the quality and integrity expected of multi-million-pound buildings, it all boils down to detail. This is especially the case with fasteners and fixings, the very components that hold structures and building envelopes together.

Planned to Perfection
As with many things in life, well-planned projects minimise the chance for errors to occur during construction, which can be costly to rectify further down the build chain.
Building envelopes, brackets and subframe systems need to be especially well considered. They need to withstand whatever the elements throw at them, from wind loads, to corrosive substances in the air and the substrate they are fixing back to. Meanwhile, they also need to be able to assure the deadweight of the cladding that is being installed on them.
Identifying these components correctly though is easier said than done. For architects and specifiers, trawling through datasheets and product specifications can be time and labour intensive.
Here is where manufacturers can help at the planning stage. With expert knowledge and tools, manufacturers can help suggest rainscreen and cladding systems that are fit for purpose, which was the case during the refurbishment of Kew Tower in Richmond.
This refurbished office building, had the upper floors of its building reclad by building envelope contractors, using the NVELOPE® NV4 system from SFS. The key to the success of the project was as much in the NV4 system as it was in SFS’ Project Builder tool.
Project Builder provides a comprehensive, project-specific cladding solution involving only a two-step process. The tool factors in considerations such as local wind loads, height of the façade, the substrate that the rainscreen system is being fixed to, selected cladding material and the cladding zone.
With this forward-thinking, planned-out approach, Kew Tower achieved an ‘Excellent’ BREEAM rating following the refurbishment. The NV4 system will also help the building endure for many years to come, thanks to built-in adjustability that allows for contraction and expansion in extreme weather conditions.

Fast and Furious Fasteners and Fixings
Raising buildings faster is not just in the planning – it’s in the detail. This includes selecting the most appropriate components that are designed to help installers on the job, such as fasteners and fixings.
Thousands, if not hundreds of thousands, of fasteners and fixings need to be secured on a given building. The time needed to install these components can quickly add up, leading to costly labour expenses. Here, any incremental gains can lead to major reductions in construction time.
This was certainly the case with the refurbishment of Parsons Tower, Newcastle College. The tower block, which dates to the 1970s, was refreshed with a contemporary zinc and copper façade with the help from SFS’ specialist fastening systems. To secure the cladding back to composite panels on the building, low profile, high-grade stainless-steel fasteners were required. The solution was the SX2/8-D9 self-drilling fastener in A4 316 austenitic stainless steel. As well as giving excellent pull out values, the thread design helped construction time by reducing over-driving.
Similarly, construction time was significantly reduced when installing the PIR insulation into concrete deck of the roof. The contractors were facing issues with extensive drilling and the need for multiple combinations of fasteners and polypropylene sleeves. The isotak® TIA adjustable fastener system from SFS was the ideal solution in this instance. The system reduced fastener and polypropylene sleeve combinations by 50% and in turn, dramatically decreased drilling times.

Buildings? Here’s one I made earlier
As well as planning and choosing the right components to help achieve faster builds, a big shift in the way buildings are realised is through modular construction. More and more, buildings and their components are being prefabricated off-site under factory conditions.
Much like fasteners and fixings that aid installers on-site, manufacturers must also be able to adapt to these new offsite construction techniques and adapt their products to suit.
In reality, this can be as simple as inserting fasteners into their sleeves before they are sent to site or supplying brackets pre-assembled. Crest Girls’ Academy in Neasden, which required modernisation to its various buildings, is a great example of pre-fabrication. As well as using the Project Builder to create a detailed design to support approximately 6,000m2 of timber and cedar cladding, the project also utilised vertical point brackets with thermal isolators to help reduce thermal bridging. These brackets were pre-assembled from SFS, to speed up construction time and also prevent loss of materials on-site.

Fast Tracked for the Future
The future of our world very much depends on the construction projects of today being built right and being built to stand the tests of time for years to come.
While we improve the pace at which we construct new buildings, it must not be to the detriment of the finished products themselves. Building envelopes must be well thought out and designed, to minimise the need for amendments both during specification and installation. They must also be well considered so that they can be as thermally efficient and sustainable as possible. By looking at all these details closely, we can facilitate faster construction and create buildings where future generations can live, work and play in comfort.

www.sfsintec.co.uk

Housing Secretary Robert Jenrick has announced new measures which go faster and further to improve building safety and in particular with regard to the removal of the combustible cladding that still surrounds many buildings.

Mr Jenrick’s announcement is set to name and shame companies who have not begun the removal of the unsafe cladding from their buildings, but for some the spotlight has swung too late.   The UK Cladding Action Group, created to raise awareness of the problem has said the progress by the government are “simply unacceptable” while John Healey, shadow housing secretary, claims the proposals are “too little, at least two years too late”. He added “Thousands of people continue to live in unsafe homes, condemned to do so by this Government’s failure on all fronts after Grenfell”.

The proposals are published on www.gov.uk and reproduced below:

• Government committed to delivering the biggest change in building safety for a generation
• Housing Secretary announces the new Building Safety Regulator within the Health and Safety Executive, to be established immediately
• Government sets out clarified and consolidated advice for building owners, proposal to extend cladding ban, update on fire sprinklers
• Response to Phase 1 of the Grenfell Tower Public Inquiry published
• Building owners who have not taken action to make their buildings safe will be named from next month

The Housing Secretary has warned that the slow pace of improving building safety standards will no longer be tolerated and he has announced measures that go further and faster to ensure residents are safe in their homes.

To give effective oversight of the design, construction and occupation of high-risk buildings – a regulator will be at the heart of a new regime – and established as part of the Health and Safety Executive (HSE).

Building owners are responsible for ensuring their buildings are safe and where there is no clear plan for remediation, the government will work with local authorities to support them in their enforcement options.

Speaking in the House of Commons, Mr Jenrick also made clear that from next month he will start to name building owners where remediation has not started to remove unsafe Aluminium Composite Material (ACM) cladding from their buildings.

While government action in this area has led to considerable progress to remove unsafe cladding, there are still some building owners who have been too slow to act.

Mr Jenrick confirmed the government will consult on extending the ban on combustible materials to buildings below 18 metres and we will seek views on how risks are assessed within existing buildings to inform future policy.

The package comes as the Prime Minister has written to the chairman of the Grenfell Tower Public Inquiry, Sir Martin Moore-Bick, updating him on the government’s response to Phase 1.

The Prime Minister and Housing Secretary also met with bereaved, survivors and residents of the Grenfell Tower fire in Downing Street last week.

Housing Secretary Rt Hon Robert Jenrick MP said:

The government is committed to bringing about the biggest change in building safety for a generation.

Progress on improving building safety needs to move significantly faster to ensure people are safe in their homes and building owners are held to account.

That’s why today I’m announcing a major package of reforms, including establishing the Building Safety Regulator within the Health and Safety Executive to oversee the new regime and publishing consolidated guidance for building owners.

Unless swift progress is seen in the coming weeks, I will publicly name building owners where action to remediate unsafe ACM cladding has not started. There can be no more excuses for delay, I’m demanding immediate action.

Today’s package of measures includes:

Building Safety Regulator

The Health and Safety Executive (HSE) will quickly begin to establish the new regulator in shadow form immediately, ahead of it being fully established, following legislation.

It will raise building safety and performance standards, including overseeing a new, more stringent regime for higher-risk buildings.

With a strong track record of working with industry and other regulators to improve safety, they will draw on experience and the capabilities of other regulators to implement the new regime. Dame Judith Hackitt will chair a Board to oversee the transition.

Chair of the Health and Safety Executive, Martin Temple said:

We are proud the government has asked HSE to establish the new Building Safety Regulator.

HSE’s vast experience of working in partnership with industry and others to improve lives will ensure people are confident the creation of the new regulator is in good hands.

Advice on building safety for multi-storey, multi-occupied buildings

Recent high-rise fires, including that in a block of student flats in Bolton in November 2019, have highlighted that many building owners have still not taken sufficient measures to ensure the safety of residents in buildings at all heights.

The government appointed independent expert advisory panel (IEAP) has clarified and updated advice to building owners on actions they should take to ensure their buildings are safe, with a focus on their external wall systems, commonly referred to as cladding.

This consolidated advice simplifies the language, consolidates previous advice into one place, and – vitally – makes clear that building owners need to do more to address safety issues on residential buildings under 18 metres.

It additionally reflects the independent panel view that cladding material comprised of ACM (and other metal composites) with an unmodified polyethylene core should not be on residential buildings of any height and should be removed.

A call for evidence will also be published, seeking views on the assessment of risks within existing buildings. This important step will help to gather ideas and lead to research which will provide a firm evidence base to guide decisions for both existing buildings and future regulatory regimes.

Fire doors

The consolidated advice also makes clear the actions building owners should take in relation to fire doors.

The government welcomes the commitment by the Association of Composite Door Manufacturers to work with building owners to remediate their doors which failed tests.

We will continue to monitor the situation closely to ensure that this commitment is followed through.

Remediation of buildings with ACM cladding

To speed up remediation, we will be appointing a construction expert to review remediation timescales and identify what can be done to improve pace in the private sector.

To ensure cost is not a barrier to remediation, the government is considering different options to support the remediation of buildings. We are examining options to mitigate costs for individuals or provide alternative financing routes.

Combustible cladding ban

The government has also launched a consultation into the current combustible cladding ban, including proposals to lower the 18 metre height threshold to at least 11 metres.

Sprinklers

The government’s consultation on sprinklers and other measures for new build flats concluded on 28 November 2019.

We have proposed lowering the height threshold for sprinkler requirements in new buildings and will set out detailed proposals on how the government will deliver the technical review of fire guidance in February.

Fire Safety Bill

The government has also set out further details of the upcoming Fire Safety Bill being introduced to Parliament, which we set out in more detail in our response to the Public Inquiry Phase 1 recommendations.

This will clarify the Regulatory Reform (Fire Safety) Order 2005 – ‘the Fire Safety Order’ – requiring residential building owners to fully consider and mitigate the risks of any external wall systems and front doors to individual flats.

The changes will make it easier to enforce where building owners have not remediated unsafe ACM by complementing the powers under the Housing Act.

Researchers have developed a nondestructive and noninvasive optical technique that can determine the setting times for various types of cement paste, which is used to bind new and old concrete surfaces. The new method could aid in the development of optimized types of cement with less impact on the environment.

“Our noninvasive optical method characterizes and determines the setting time of cement, which is a very important parameter for the construction industry,” said José Ortiz-Lozano, a member of the research team from Universidad Autónoma de Aguascalientes, Tecnológico Nacional de México and Centro de Investigaciones en Óptica, in Mexico. “It can also precisely assess the cement hydration process in real-time. This information is crucial for both the study of physical chemistry and the quantitative characterization of the nanomechanical properties of cement-based materials.”

In the Optical Society’s (OSA) journal Applied Optics, the researchers describe the new method, which combines laser-based technology with an optical model to calculate the dynamic behavior of the cement paste. The researchers show that their approach can accurately calculate both the initial setting time — the time available for mixing the cement and placing it in position — and the final setting time, when the cement reaches its full strength.

“Our group is trying to enhance the performance of cement-based materials, such as cement pastes, mortars and concrete,” said Ortiz-Lozano. “New material characterization methods, such as the one we report here, can be used to improve the behavior and performance of cement by optimizing its constituents. This could lead to new types of cement that use less water and raw materials like limestone and clay, which would make them more environmentally friendly.”

Studying cement with light

Although a variety of techniques exist to study the dynamics of setting cement, they come with various drawbacks such as being destructive, invasive or influenced by human factors. The new method uses the optical properties of cement paste to directly calculate the initial and final cement setting time by measuring the diffuse light that reflects off the cement.

As the cement sets, the diffuse light reflection changes as it reacts with water and the spaces between the cement particles change. The amount of water present and the protective surface layer at each setting stage also influence the diffuse reflection properties. The researchers combined the diffuse reflection measurements with the Kubelka-Munk model, which is used to describe diffuse reflection of opaque samples.

“This new optical method was developed using tools, components and materials common among the optical industry,” said Ortiz-Lozano. “It would be, therefore, quite simple and economic to implement in cement quality control laboratories. It can be applied to any type of cement once the appropriate calibration is performed with the Kubelka-Munk model.”

The researchers applied the new technique to six cement samples and found that the results for all the samples were repeatable and agreed well with measurement techniques commonly used today.

“This laser-based technique gives continuous and accurate assessment of cement hydration process with high repeatability and reproducibility, showing its potential for studying the physical chemistry properties of cement,” said Ortiz-Lozano.

Next, the researchers plan to acquire more data using more types of cement, mortars, concretes as well as additional water to cement ratios and cement pastes that contain chemical and/or mineral admixtures. They are also planning to perform the work required to normalize the method as a standard.

Source: Science Daily