Updates on steel roofing sheets, metal roofing installations aand roofing supplies are available on the news page.
Sunday, 31 January 2016 12:18

Saflok 700

Today's trend for sustainable designs that reduce environmental impact is helping drive the metal roofing market to new heights. Understanding the engineering concerns fundamental to the proper design of metal roofing will enable specifiers to serve the long-term interests of their clients, and reduce liability for all concerned.

In large-span metal roofing applications, concealed fix roof systems are the logical choice – they are fixed to the purlin with a clip system, and are not pierced with any fasteners. The clips serve two purposes – they circumvent the need for holes in the sheet (which prevents the possibility of leakage through the perforation) and they allow the roof to expand and contract in a sliding movement over the clips.

Because the sheets can slide over the clips, they can be rolled in long lengths which can thermally expand without restriction.  If the sheets were positively fastened through the sheet into the purlin, the fasteners would take the brunt of the force of expansion, and would tear larger holes in the sheet, or shear off. Consider that coated steel expands at a nominal 1mm per 1m, and it is apparent that a sheet of a mere 15 m will move by 15mm in heat.  It is common best practice to not install a pierced fix sheet in lengths of more than 15m for this reason.  Over 15m, a pierced fix sheet should be end lapped to allow for thermal cycling.

A concealed fix system allows sheets to be rolled in continuous lengths up to 120m or more. The lack of end laps further helps reduce the risk of leaks.

In these applications, with the size of investment concerned, engineering performance of the roof “system” is critical.

The first distinguishing characteristic of a concealed fix roof is the profile, which is both aesthetic and functional.  For low sloped roofs, one is looking for a defined rib, with a wide deep pan to deliver excellent water run off at slopes as low as 2 or 3 degrees. The height of the rib is important as it also provides structural strength, acting rather like a mini I-beam.

Of equal concern is the design of the clip, as this is the “anchor” securing the sheet to the sub structure and holding it down in high winds.  The material and thickness of the clip helps determine its inherent strength, which in turn helps to determine the minimum wind-uplift resistance requirements for a particular roof.

The overall “system” design defines the manner in which the clip locks into the sheet profile. The clip should engage every rib of the profile to prevent wind cushioning under the unsecured rib, and distorting the sheet off the clip.  Generally, the more ribs that are secured with a positive clasp holding it to the purlin, the stronger the wind uplift resistance.  If not positively secured, the ribs should be shaped to provide a strong and stable interlock with the clip at every point.  

The system must be able to withstand the foot traffic and loads imposed by the installation of HVAC units, rooftop photovoltaic (PV) systems, or other utilities.  

As a profession, you should demand full technical details of the system you intend to specify – and request technical support throughout the installation itself.

Safintra is proud to offer this service free of charge to its customers, from 7 branches countrywide.

Published in News
Sunday, 31 January 2016 12:16

Good looks roofs meet great value

With a contemporary design, Safintra’s Trimflute® metal roofing profile is both visually appealing and cost-effective.

A visually stunning and cost-effective metal roofing profile, Trimflute® is unique to Safintra South Africa and is now available in the Gauteng market. It has a subtle square fluted profile with a contemporary visual appeal, ideal for both roofing and cladding applications.

The Trimflute® roofing profile is especially cost-effective when used as side cladding on large industrial projects which have Saflok concealed fix or similar profiles on the roofing.

With a wider pan than any other square-ribbed equivalent, it delivers more than almost 10% cost advantages over both IBR roof sheeting and wider pan profiles such as Widedek.

Its wide pan has excellent water handling performance and the extra wide sheet, which provides over 1m effective cover after lapping, makes it highly cost-effective for budget-sensitive projects.

An ideal roofing solution for industrial, commercial and institutional buildings, this profile can be rolled in any coated steel or in aluminium.

The striking Govan Mbeki Sports Centre in Port Elizabeth, designed by Adendorff Architects & Interiors, features Safintra’s Trimflute® profile extensively for both roofing and side cladding. Apart from adding to the aesthetics of the development, the product was selected due to it being an economic choice.

Sally Stromnes, marketing manager for the Safintra Group, says: “South African architecture is right up there with the best the world has to offer, not only in its design, but also for its innovative use of steel for its functional benefits.

“Our built environment professionals and end-users have caught up with the environmental upside of using steel – its excellent thermal properties, its strength to weight benefits, and the fact that it is cost-effective, durable and completely recyclable. Add the good looks of a really elegant profile that is visually distinctive and metal sheeting demonstrates real value in both design and function.”

 

Safintra South Africa
Tel: 011 323 6300
www.safintra.com

Published in News
The Safintra Group recently opened two new offices in Bloemfontein and Windhoek

Metal roofing manufacturer, Safintra, recently opened two new sales offices in Southern Africa. The new offices, situated in Bloemfontein and Windhoek, intend to help the company offer localised support to its customers wherever they might be.

Besides providing sales and technical support to customers in the Free State, the Bloemfontein office will also cover the Northern Cape. The Bloemfontein office boasts a showroom area that will be used by architects, engineers and contractors as a reference centre for product specification information and specialist installation advice.

The Safintra Group also has operations in ten other countries in the(delete) SADC, Southern and Eastern Africa including Mozambique, Zambia, Malawi, Angola, Tanzania, Kenya, Uganda, Ethiopia, Rwanda and Burundi.

Safintra Roofing & Steel
Tel: 011 823 4027
Fax: 011 823 4288
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Blog: http://safintraroofing.wordpress.com
Website: www.safintra.co.za

Published in News
Sunday, 31 January 2016 11:49

SAFLOK 700 – Value Engineering at Work

Today's drive to design buildings that reduce environmental impact is helping drive the metal roofing market to new heights.

Most large roofs are concealed fix roof systems (also called secret fix systems). In principle, they provide some common benefits:

The sheet is fixed to the purlin with a clip system.  The sheet hides the clips completely, providing a neat, watertight and no-holes roof, which eliminates the risk of leaks.
Metal expands and contracts at about 1mm per 1m. The clips allow the sheet to thermally expand over the clip in a sliding movement, so very long lengths of continuous sheeting can be installed with no end laps, thus providing further weather tightness.

However, the secret from a performance point of view is not that the sheet is secured by an unseen clip, but the engineering of the clip, and its fit with the profile of the sheet. Aside from profile itself, it is the clip designs that distinguish concealed fix metal roofing systems from each other.

One of the biggest dangers with concealed fix roofing is the wind-uplift performance.  No two roofs are the same, and most roofs experience several different areas of wind pressure, whether negative or positive pressure. The material thickness of the clip (gauge) helps determine its inherent strength, which in turn helps to determine the minimum wind-uplift resistance requirements for a particular roof.

3. Value engineering

For all roofing systems, energy payback is derived almost exclusively from R-value, and R-value is derived almost exclusively from insulation. A high-performance metal roofing solution is among the best ways to protect that investment. Once a customer understands how much of his R-value investment is lost, once water penetrates the insulation, the added protection provided from a high-performance roof becomes apparent.
In the realm of roof performance, reducing up-front costs for short-term savings inevitably leads to increasing costs and liability down the road. Learning to analyze the bottom-line benefits of rooftop longevity is critical to specifying appropriate metal roofing solutions. The performance-to-cost ratio will vary with every roof specified, and can only be identified through a comprehensive review of several factors, including:

  • How long will the client own the property? Since metal roof systems can significantly outlast most non-metal alternatives, property owners who intend to hold on to their buildings longer will reap the largest rewards from metal's life-cycle costing advantages.
  • How disruptive will eventual restoration and re-roofing be to the building's occupants? The installation of a metal roof is odor-free, cleaner, and more environmentally friendly than hot-applied systems. However, installing metal systems can present logistical concerns, especially for high-rise buildings with limited access. Although freight elevators can typically carry materials needed for non-metal systems, for metal systems, large cranes may be necessary to haul longer panels to the top of the building.
  • What is the intrinsic value of the property under the roof? The higher the value of the property occupying a building, the easier it is for building owners to rationalize the higher initial costs of metal systems.
  • What is the customer's existing budget? If price were no object, we'd all be living and working under roofs of copper, zinc, or even titanium. Regardless of the desirability of long-term solutions, short-term budget realities sometimes prohibit lasting solutions. When a customer's initial budget will not accommodate the costs of a premium metal, innovative financial products such as leasing may be considered. Equally relevant is how soon additional money will become available. It may make sense to install a low-cost alternative on new construction, when budgets are strained, if seven years down the road money will become available for installing a more lasting metal roof system.
  • How important are aesthetic considerations, given the roof's location and the building's function? Aesthetic versatility is probably the single biggest reason that owners opt for metal roofing. When aesthetics are a major concern, metal roofing offers added value.
  • How likely is it that the owner will follow through on routine maintenance? Generally speaking, metal roofing requires less maintenance than non-metal systems, which may need more frequent re-coating, fresh graveling, or aggressive restoration to maintain resistance to ultraviolet (UV) radiation and weather.
  • How frequently will the roof need to be accessed due to HVAC, rooftop photovoltaic (PV) systems, or other utilities? Although metal systems withstand foot traffic as well or better than non-metal roofs, roofs that require a lot of penetrations for HVAC or other appliances are not ideal candidates for metal roofing, as previously explained (see introductory section of this article on the advantages of metal).
Published in News
This article is part 3 of a series on sustain-ability in the built environment, aimed at professionals, specifiers and owners looking to green building best practise. They focus specifically on the role played by metal roofing and cladding systems in creating better buildings.

Detailed installation methodologies for insulated roof spaces are often over-looked at design stage. As a result the insulation performance may be negatively affected during the on-site installation process, and not achieve prescribed R-Value’s stipulated in the SANS 10400XA standards.

Of key importance, it is imperative that insulation maintains its full design depth throughout the roof assembly in order for it to achieve its R-value. Compression of insulation compromises the R-value & thermal performance of the material.  It also increases thermal bridging along purlin lines.
Factors such as cost, aesthetics, thermal performance & combustibility all play a major role in the selection of an appropriate insulation material for a project.  

Rigid insulation boards & flexible insulation blankets are the two most popular types of insulation used in commercial roof assemblies in South Africa.

  • Rigid insulation boards generally cope better under compression but as their specified depths increase so do the associated costs, and increased risks with long fasteners and system instability.
  • Flexible blanket insulation installed over purlin will be subjected to considerable compression along the purlin lines if the outer weather sheet is not elevated. Suitable spacer systems should be employed in these instances to prevent or reduce compression.

insulation1

insulation2

There are various forms of spacer systems available in South Africa.

Continuous spacers or ‘packers’ are available in a number of forms such as Timber, XPS or Steel. They are secured directly to the purlins in continuous lengths on top of the insulation blanket which is draped over purlin.

  • Packers will cause compression at the purlin but allows the blanket to regain some loft between purlins by elevating the weather sheet.
  • It is necessary to compensate for this loss in overall R-value by increasing the depth of the specified insulation blanket and packer accordingly.  (See table)

Mechanical spacer systems form the backbone of site assembled roofing systems where warranted   thermal performance is required. They eliminate compression of the insulation blanket and take the guesswork out roof assembly performance.

  • Lightweight structural steel bars (acting as purlins) are mechanically locked into each other to create the lengths required.
  • The bars are supported by brackets, which are available in a variety of heights to accommodate varying blanket thicknesses. The support brackets create a defined cavity for the insulation material and keep fasteners within safe working lengths. Specific loading requirements are achieved by varying the support bracket centres.

fastener1
TABLE:  R-Value’s achieved by 135mm Glass Fibre Insulation Blanket using various Spacer & Packer options:

Table R Values

For further information contact Safintra:
www.safintra.com / www.safintra.co.za
This email address is being protected from spambots. You need JavaScript enabled to view it.

Branches in SA : Johannesburg, Durban, Cape Town, Nelspruit, Polokwane, Port Elizabeth, Bloemfontein
Further operations in:  Namibia, Zambia, Mozambique, Malawi, Tanzania, and East Africa.

Published in News
Sunday, 31 January 2016 11:17

Simple, clever sustainability

Anticipating the current spike in rooftop solar panel installations, Safintra became the sole agency for S-5 clamps.

Part 2: Demand for alternative energy driving innovation in metal roof systems

This article is part of a series on metal roofing and cladding systems that promote sustainability.


Escalating electricity prices and Eskom’s supply constraints have forced South African building owners to look at alternative energy sources, particularly solar energy. Therefore, rooftop solar panel installations have seen a dramatic spike in demand.


This move towards solar is supported by the This issue was presaged by SANS 10400-XA legislation, which specifically promotes thermal efficiency of buildings. It requires that the roof structure achieves specified R-values to contribute to the overall thermal performance of the building envelope.


“As a result of both these factors, the local roofing industry, which had seen little change in decades, has suddenly started making giant strides in improved roofing installation practices and new products to meet needs for alternative energy co-generation, as well as with the SANS XA requirements,” says Rainer Straussner, business head of Safintra Southern Africa.


Anticipating this change over a year ago, Safintra obtained the sole agency rights for S-5 clamps, the world’s leading clamp and PV attachment systems for metal roofs.


“The need is for components that are able to secure solar panels to the roof with the least weight, and in the case of concealed fix roofs, to do so without any fastener penetration which will void roof material warranties,” Straussner explains.
“An equally important issue is the matter of warranties on the various components that make up a roofing system. For example, a solar panel commonly has a warrantee of 30 years and a steel roof has a warrantee of 15 years or more, but most PV mounting systems offer a limited warrantee, if any at all, meaning that expensive and possibly damaging maintenance is required during the service life of the roof in order to replace small components that have weathered,” he adds.

Safintra will furnish clients with a long term warrantee on its entire roofing system, including the steel roof, fasteners, clamps and PV attachment components, all of which match the life of the PV panel and minimise maintenance costs, according to Straussner.

And as part of its total solutions drive, Safintra has set up a specialised engineering department to assist owners, architects, specifiers and engineers with calculations pertaining to thermal efficiency in buildings.

Is metal roofing the way forward?

Steel is a sustainable material that is 100% recyclable. It is a product with exceptional green credentials, which is increasingly being specified by environmentally conscious companies building for Green Star ratings which reduce energy usage, and is therefore particularly attractive to tenants. By creating a roof system which has high thermal performance and is ideal for solar panel attachment, the roof is becoming the hardest working part of the building envelope.


“And we continue to innovate . . . this is just the start of a range of offerings which make steel roofing the greenest option around. Safintra will continue to lead the field, not only in South Africa but in the greater sub-region,” states Straussner.

 

Safintra South Africa
Tel: 011 323 6300
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Website: www.safintra.co.za and www.safintra.com

Published in News
This article is part 2 of a series on sustain-ability in the built environment, aimed at professionals, specifiers and owners looking to green building best practise. They focus specifically on the role played by metal roofing and cladding systems in creating better buildings.

Escalating electricity prices and Eskom’s supply constraints have forced SA building owners to look at alternative energy sources, particularly solar energy. Roof-top solar panel installations have seen a dramatic spike in demand.

This move is supported by the introduction of SANS 10400-XA legislation which specifically promotes thermal efficiency of buildings.  It requires that the roof structure achieves specified R values to contribute to the overall thermal performance of the building envelope.  

“The local roofing industry, which had seen little change in decades has, as a result of both these factors, suddenly started making giant strides in improved roofing installation practises, and new products to meet with the alternative energy co-generation, and with the SANS XA requirements,” said Rainer Straussner, Business Head of Safintra Southern Africa.

Anticipating this change over year ago, Safintra obtained the sole agency for S-5 clamps, the world’s leading clamp and PV attachment systems for metal roofs.

“The need is for components that are able to secure solar panels to the roof with least weight, and in the case of concealed fix roofs, to do so without any fastener penetration which will void roof material warranties,” he explains.

“An equally important issue is the matter of warranties on the various components that make up a roofing system. “For example, a solar panel commonly has a warrantee of 30 years and a steel roof has a warrantee of 15 years or more, but most PV mounting systems offer a limited warrantee, if any at all, meaning that expensive and possibly damaging maintenance is required during the service life of the roof in order to replace small components that have weathered.”

Safintra will furnish clients with a 20-30 year warrantee on its entire roofing system, including the steel roof, fasteners, clamps and PV attachment components, all of which match the life of the PV panel and minimise maintenance costs, says Straussner.

And as part of its total solutions drive, Safintra has set up a specialised engineering department to assist owners, architects, specifiers and engineers with calculations pertaining to thermal efficiency on buildings.

Is metal roofing the way forward?

Steel is a sustainable material that is 100% recyclable and is a product with exceptional green credentials, which is increasingly being specified by environmentally conscious companies building for green star ratings which reduce energy usage, and are therefore particularly attractive to tenants.  By creating a roof system which has high thermal performance, and is ideal for solar panel attachment, the roof is becoming the hardest working part of the building envelope. 
“And we continue to innovate… this is just the start of a range of offerings which make steel roofing the greenest option around.  Safintra will continue to lead the field not only in SA but in the greater sub region” states Straussner.

 

For further information contact Safintra:
www.safintra.com / www.safintra.co.za
This email address is being protected from spambots. You need JavaScript enabled to view it.

Branches in SA : Johannesburg, Durban, Cape Town, Nelspruit, Polokwane, Port Elizabeth, Bloemfontein
Further operations in:  Namibia, Zambia, Mozambique, Malawi, Tanzania, and East Africa.

Published in News

Safintra has secured the sole distribution rights to the widely specified above-roof clamp range known as the S-5. These clamps are designed for the solid attachment of almost anything to metal roofing or side cladding, from photovoltaic panels to HVAC systems or signage.  

The non-piercing system enables panels, aerials and wind-breaking devices to be fitted and attached above the roof without compromising weatherproof performance.

S-5® clamps are available for virtually any metal sheeting profile and are made from solid aluminium. All additional hardware, such as bolts and plates, use non-corrosive 300 series stainless steel, which is totally compatible with aluminium-zinc coated metal sheeting, sold in South Africa as Colorplus, Colorbond, or as Zincal or Zincalume.

Sally Stromnes, Group marketing manager of Safintra, says the clamp technology used on concealed fix panels involves gripping the seam in such a way that there is no penetration of the panel material. This means that sheeting warranties are preserved intact. And the holding strength of the S-5® clamp is unsurpassed, with ultimate load-to-failure rates averaging more than a ton. “In some cases this load-to-failure value is over four tons.  

“These S-5 clamps use patented, round-point set-screws which will not void the sheeting’s warranties. This is a critical factor for any investor who expects the building to perform for an effective occupied life of at least 20 years, if not more,” she says.

Stromnes points out that it is common practice for most roofing clamps and grips to use “cup-point” screws, which cut through the protective coating causing corrosion and voiding warranties.

“We will continue to drive innovations, which raise the bar in metal roofing solutions,” says Stromnes.

“With our focus on sustainability, it is inevitable that metal roofing will become the material of choice for property owners and it is our mission to make a world of difference in the roofing market.

“This objective is more relevant today than ever before,” she adds.
The built environment is responsible for 40% of the world’s greenhouse gas emissions and uses one third of the world’s resources, implying that it is now vital to build sustainable and environmentally-friendly structures.

The South African SANS 10400 energy-efficiency standards are now a requirement for all buildings, and this in itself will drive innovation in design and construction. A well-designed roofing system is a critical part of a building’s durability and service life.
For roofing, sustainability is associated with using fewer raw materials while delivering a longer lifespan, and remaining functionally efficient.
•    The technology used to make aluminium-zinc coated steel roofing provides up to four times the lifespan of alternative steel coatings.  
•    Steel roofing can accommodate solar panels and water harvesting systems without compromising the performance of the roof.
•    Steel roofing is more thermally efficient than roof tiles when using insulation.
•    The ease of over-roofing or retrofitting insulated steel is increasingly important for architects and building owners.
Speak to Safintra about their warranted roofing systems, which deliver returns for the investor, the occupier and the environment.


Safintra South Africa
Tel: (011) 323-6300 (JHB office)
Website: www.safintra.co.za and www.safintra.com

Published in News

How metal sheeting can provide a thermally effective roofing system.

A well designed and installed roofing system is a critical component of a building’s durability, sustainability and serviceability. Sally Stromnes, Marketing Manager of the Safintra Group, explains how metal sheeting can provide a thermally effective and durable roofing system.

Because metal sheeting is installed in continuous lengths with sealed end and side laps, it creates a roof cavity that doesn’t leak air. Beneath the roof cladding, an air gap is created that retards heat intake in summer and cold intake in winter.

The addition of insulation materials further enhances the effectiveness of the roof cavity in regulating temperature. A vapour barrier and an insulation blanket of approximately 100mm (at full loft) will provide further saving on heating and cooling bills in a year. “This makes a metal roof more thermally effective when comparing it to other roofing materials installed with insulation” says Stromnes.

“Metal roofing therefore performs in accordance with SANS 10400 XA legislation which recognises not only sustainability, but also seeks to dramatically reduce energy usage within the built environment,” adds Stromnes.

When it comes to mounting thermal and photovoltaic systems on roof tops, metal roofing is also an ideal choice as it provides a substrate that is both rigid and structural.

Minimising roofing maintenance costs

All roofing system components should ideally have a similar warranty period to ensure that maintenance on isolated parts of the system is minimised during its useful life.

“It is costly to dismantle systems to replace small and usually fairly inexpensive components in a 10 year old roof. Safintra metal roofs, their warranted Fixtite fasteners and their S-5 clamps will give you a working system of 20 years and more, which parallels the expected service life of good quality solar panels.  

This provides a maintenance-light roof system with 20 year maintenance cost savings far in excess of the initial cost saving on cheaper but shorter-lived components at installation stage,” concludes Stromnes.

Safintra is the sole African distributor for the internationally renowned S-5 brand of clamps and brackets, which have been used in field service for over three decades (and counting). These clamps and brackets securely fix to the metal roof seams to secure a variety of rooftop attachments, from walkways and service ramps to signage and ducting, without retarding the drainage or weatherproof performance of the roof sheeting.

Safintra South Africa
Tel: 011 323 6300
www.safintra.com

Published in News

Fasteners that keep metal roof sheets in place are just as important as the roof itself. As they are the only item actually securing the sheet to the substructure, there should be no compromise on quality to try to save costs.

Fastener failure is primarily due to inadequate or to non-compliant coating of the fastener. The coating is the sole protection provided to the fastener substrate, and as it weathers off, the shank and head become exposed to water and contaminants which rapidly eat away at the core steel, causing fasteners to fail.  

Bigger roll-formers have now started specifying the fastener type and class that will preserve warranties on their sheeting.

Roofing fasteners in short

Standard: SANS 1273.

Biggest reason for failure: The wrong class or type of fastener is used, and becomes a source of corrosion on roof sheeting.

Biggest challenge: Insulation being installed in thicknesses up to 135 or 150mm, which places enormous strain on fasteners.

What is law?

SANS 1273, which was revised in 2009, when more emphasis was placed on corrosion resistance of the fastener.

What are some of the biggest fastener challenges in the roofing industry?

Lack of knowledge of fastener standards:
We see roofing failures as a result of inadequate fastener usage, and while it is one thing to have a standard, it is another story for the industry to apply it or for building inspectors to correctly police it.

Insulation thicknesses:
Revisions to the energy-efficiency standards have resulted in insulation being specified in thicknesses never seen before, which requires extremely long fasteners. This can lead to instability of the entire installation.

Vendors make claims made for their fasteners which cannot be verified:
Many fasteners sold in SA are not compliant with our legislation, and are not manufactured to the standards required for the Class of fastener they claim to be.  Independent and credible testing verification of coating properties is critical.  

Traceability of fasteners:
If fasteners cannot be identified by manufacturer (usually as a distinctive head marking), they cannot be tracked back to the actual batch of manufacture, the responsibility for fastener failure will fall on others in the supply chain, and not on the fastener manufacturer. This has massive cost and credibility implications for installers, suppliers and professionals on the project.

When buying fasteners, what are the key points to consider?

  1. Understand the site location and corrosivity environment before determining the grade of fasteners to use. The lifespan of the roofing fastener should match or exceed that of the roof sheeting in that environment. Never use anything less than the minimum class as suggested by the sheeting manufacturer or roll former.
  2. Compatibility of the roof fastener with the roofing material is crucial. If not, there will be a galvanic reaction between the fastener and the roof sheeting material, causing premature corrosion of both fastener and sheeting.
  3. Follow the recommendations of the metal manufacturers or roll formers as to which fastener coatings and classes are appropriate for the sheeting in order to preserve warranties and life span on the sheeting.
  4. Only buy products from known manufacturers who can back up what they claim about their fasteners. This ensures accountability by the fastener manufacturer who should be prepared to stand behind his product for the duration of its service life. He must also be able to provide you with specifications and test reports to verify the fastener ‘class’.
  5. All screws must have EPDM sealing washings which are free of carbon fillers. Black carbon causes premature corrosion of coated steel.
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