Unbeatable Protection, Whatever The Weather 

Whether it’s wind, rain or snow, sun or frost, a roof is on the front-line each and every day, therefore it pays to choose a waterproofing material which can withstand whatever Mother Nature throws at it. The toughest, most durable waterproofing membrane and one that will withstand our increasingly destructive weather in the long-term, is mastic asphalt.

Roofs across the UK are exposed to the elements and temperatures from a sizzling 38ºC in summertime all the way down to a shivering and mind-numbing-27ºC in midwinter. Roofing materials have to be tough enough to cope with this wide temperature swing, otherwise they will degrade and ultimately fail. Wind will also give roofs a beating, especially taller structures or those buildings which have more exposed roofing surfaces. Vibrations caused by wind can lead to material fatigue and crack formation. Hail and snow are another pair of heavy-hitters and can also cause mechanical roof damage, while freeze/thaw cycles are an environmental stress for many roofing materials. Water expands when it freezes and can therefore enlarge cracks.

If you want a roof that will last, then it pays to use mastic asphalt.  It is highly resistant to all types of weather and attacks from thermal shock caused by rapid temperature changes, which are a frequent source of breakdown in many other types of membrane.

Providing such excellent wear against the extremes of weather – and with a life expectancy of 50 years and more – the waterproof membrane is fast becoming the material of choice for a manner of different buildings including, schools, offices, shopping centres, hotels and even churches.

The traditional material comprising of limestone and bitumen, with the addition of modern polymers, is robust enough to withstand severe and fluctuating weather and is both non-toxic and non-flammable. Its durability of use is one of its major benefits, with no application too tricky.

Mastic asphalt has one further advantage over other types of waterproof membrane – it is carbon neutral – a massive bonus for any building owner anxious to show their green credentials and, when it has reached the end of its useful life, it can be recycled or used as roof screed, minimising the impact on the environment.

Highly cost-effective, mastic asphalt offers lower installation costs than many other types of membranes. Its versatility makes it the ideal choice for not only flat roofing, but also flooring and paving. It is also extensively used on bridges, car parks and other types of structural decks.


Sika’s watertight roofing membrane provides sanctuary for stunning new church

The flexible, easy-to-apply, aesthetic properties of Sika’s watertight single-ply membrane proved the ideal solution for a stylish and unusual roof design – the crowning glory of a new, multi-million pound community church.

The £4.5 million C3 Centre in Cambridge was built to host community events as well as serve as a place of worship. The two-tier building’s architecturally-striking feature is its ‘fantail’ roof. Tapering to a point at one end, the roof’s design presented a challenge to Farrans Construction, main contractors of the church building project.

The company required a roofing system which not only offered the optimum watertight performance; it had to complement the structure’s eye-catching design. With Cambridge Flat Roofing specified to carry out its installation, the Sika-Trocal SGK system met the contractor’s brief to perfection.

Suitable for both new build and refurbishment applications, in both warm roof and cold roof construction, Sika-Trocal SGK is the best-cost performance bonded membrane for use on all types of substrates. Offering excellent flexibility and high resistance to ageing and weathering, Sika-Trocal SGK ensures a long-lasting, low maintenance roof covering.

Wayne Farrington, Director at Cambridge Flat Roofing, commented: “The roof looks pretty spectacular and certainly offered a challenge in terms of its construction. There’s no doubt the Sika-Trocal SGK system’s specification aided the building process.

“It not only looks as good as it performs, it was simple and quick to install. It made a potentially tricky installation, quite straightforward.”

Work on the church roof started in March 2015. As well as the installation of Sika-Trocal SGK on the 1,500m2 main roof, Cambridge Flat Roofing applied Sika-Trocal’s Type SGmA single-ply membrane as part of a sedum roof build-up on a lower area of the building.

The fully-adhered Type SGK roofing membrane is approved by the British Board of Agrément (BBA) to have a life expectancy in excess of 35 years. Its easy application ensured the church’s stunning roof was completed ahead of the client’s strict eight-week deadline to ensure this gloriously-designed building will remain watertight and functioning as a vital community hub long into the future.

For more information please call 01707 394444, or visit www.sika.co.uk.


Impressive Center Parcs roof refurb completed with zero guest disruption

Pictures show the Centre Parcs project during and after completion

With capacity for almost 4000 guests and 96% occupancy, keeping the central area of Center Parcs Longleat Forest open was key to the refurbishment of its impressive Subtropical Swimming Paradise. A massive challenge for Delomac Roofing, the project to renew the roof with a Sika Sarnafil membrane was accomplished with two years of meticulous planning and 30 months of onsite construction.

Originally completed in 1994, the Subtropical Swimming Paradise roof and glazed rain-screen systems were in need of refurbishment. The new roof installation was planned in close discussion with the Sika Sarnafil and Delomac supply chain, developing the specification to address all the client’s strict performance, environmental and aesthetic requirements.

Chris Meadows, Technical Advisor, Sika Sarnafil explained: “The client needed a durable, long lasting roof system that would complement the woodland setting. This was complicated by differences between the swimming pool side and dry side, with restaurants and meeting rooms, of the building.

“We proposed two distinct solutions– a mechanically fastened system using Sarnafil S327-18EL for the dry side and an adhered system using Sarnafil G410-18EL for the more humid area. Both were specified in Patina Green to blend with the natural environment. Sarnafil membranes are cold applied and free from naked flames, the obvious choice for an open site.”

An innovative temporary terraced platform was designed and installed, suspended underneath the main structure by cables and lattice beam scaffold units. Work was carried out over 16 separate sections, like a wagon wheel – ensuring the structure was not compromised by uneven load distribution. This stepped, terraced temporary roof was then covered with plywood and completely weathered by Delomac with a Sarnafil membrane.

With the temporary roof in place, existing glazing and coverings could be safely removed, maintaining water-tightness with guests enjoying the facilities below. Scheduled over more than two years, this way of working resulted in a dry building envelope, despite some of the wettest weather on record.

Comprehensive vapour barrier measures were used on the pool side of the building to ensure the high humidity chlorinated environment was contained. Robust SFS sealant and Sarnafil metal-lined vapour barrier detailing at all Glulam beams and fascia interfaces ensured no risk of condensation.

Sarnafil membrane and accessories were used for all the coverings, and again overall specification development was tailored to suit the varying build-ups; new, overlay, bonded and mechanically fastened. An increased thickness membrane was manufactured in one single batch to ensure colour consistency. Sika added further value with an impressive 17 visits to the site by the Applications Team to advice and support.

Brendan McNulty, Delomac Roofing, described the challenges the team faced during the project: “Installation methods and curved roof areas required our operatives to work from harness and rope access. We developed an innovative material loading trolley with the builder to deliver materials to the work sections safely, without compromising finishes.

“Workmanship standards remained exceptionally high, despite the challenging logistics, and met the client requirement of consistent lap and detail arrangement. This was also helped by the quality of the Sarnafil membranes. The finished installation has transformed the internal and external appearance of the building. Rooflights and white soffit finished decking have provided a bright and airy environment, with the external green finish blending subtly with the landscape.

“Most importantly, safe, unlimited guest access to the pool, restaurants and meeting areas was maintained throughout the entire project; something we’re very proud of.”

Sika Sarnafil is based at Sika Limited, Watchmead, Welwyn Garden City, Hertfordshire, AL7 1BQ. Call 01707 394444, fax 01707 329129, email sarnafilroofing@uk.sika.com, visit www.sarnafil.co.uk or follow @SikaSarnafilUK on Twitter.



Roof-Pro Delivers Roof Access Systems for Royal Derby Hospital

Roof-Pro has successfully completed a £22,000 bespoke roof access system project at the Royal Derby Hospital for an extension which houses an MRI scanner and associated equipment.

As well as being asked to provide easy and safe rooftop access to the MRI scanner’s rooftop-mounted chiller unit, which generally requires a service check at least once a quarter, Roof-Pro were also asked to design and build roof access systems for the whole new building.

The main elements of this multi-component project were:

  • Providing stable, non-penetrating support for the chiller and Air Handling Units (AHUs)
  • Providing a waterproof method of bringing cables and pipes from the service units down into the building
  • Providing step-over access to the chiller support platform, enabling the units to be serviced and inspected by maintenance personnel.

The project involved a combination of standard and bespoke components designed and built by Roof-Pro, including:

  • Chiller Support Platform – a bespoke component which took into account the weight of the unit and the load-bearing qualities of the roof, and required specially-designed large steel girders.
  • Roof Penetration Box – this solution was based upon the Roof-Pro PP-3 access riser, which ensures a watertight seal for the point at which the chiller unit’s power and water cabling pass through the surface of the roof.
  • Step-Overs – specially designed to fit the chiller platform and surrounding roof structure, these were tailored components from our Roof-Pro step-over system.

To successfully deliver this unique project required high attention to detail. Roof-Pro worked closely with two key contractors: Mellor Bromley Mechanical Services, who delivered the chiller and AHUs; and Derwent Valley Construction, who were responsible for the fabric of the rooftop.

All the components were delivered and installed on time and within budget, enabling the primary contractors to complete their projects on time.

To find out more about Roof-Pro roof access products, call 01536 383865.



Castle applies Kemperol to Turret Library roof


Cold liquid-applied waterproofing specialist, Kemper System, has helped to protect books and interior finishes at the historic Bolton School following a refurbishment of the Turret Library Roof.

Roofing contractor, Castle Roofing Consultants, carried out the roof refurbishment following the failure of the previous waterproofing membrane, which had been used to overlay the original asphalt roof less than a decade earlier. Subsequent water ingress had started to cause staining on the library ceiling and degradation of interior finishes.

The affected area of roof sits above the main entrance to the school’s neo-gothic red sandstone quadrangle, with a turret on each corner and a flag pole in the centre. Castle Roofing used Kemper System’s Kemperol V210 cold applied waterproofing system to overlay the existing roof and provide a suitable colour match to the lead flashings of the traditional building.

Castle Roofing stripped out the existing lead flashings on all four sides of the 100m2 roof area and ground out a 40mm deep chase on each of the four sandstone walls that form the perimeter of the Turret Library roof.

The installation team then cleaned the existing substrate and carried out patch repairs where the substrate was blistered or water ingress had occurred before applying Kemper System’s D Primer.

The Kemperol V210 was then applied to the roof in a single process involving the waterproofing membrane, followed by a 165g flexible reinforcement fleece and further resin to ensure full saturation of the fleece before the system was allowed to cure.

The new waterproofing system was dressed to the full roof deck and into the chases, along with the upstands, flag pole plinth and the plinth for the roofline. The chases were then resealed using sand and cement to ensure a completely seamless, monolithic waterproof membrane that will deliver a BBA-accredited 25-year service life.

Comments Ian Clarke, head of estates at Bolton School: “Castle Roofing has successfully used the Kemperol V210 system to waterproof the Turret Library roof and protect its interiors in a project that took just one week to complete during the half term break.

“The scheme will provide a robust, long-term solution for the roof while ensuring that there is no aesthetic impact on the fabric of our beautiful building.”


Cost-effective flat roof refurb solution from WOLFIN


For failed flat roofs, leading producer of synthetic flat roof and building waterproofing systems, WOLFIN (part of the Icopal Group) has developed an innovative roof refurbishment alternative to replacing the roof completely. The WOLFIN Vapour Permeable Roof Refurbishment Solution is a 20-year insurance-backed system, which saves a significant amount of money, time and disruption for commercial and public sector clients, especially for large refurbishment projects. An independent cost analysis by Aecom assessed that a saving of circa 17% to 28% is possible in comparison to traditional refurbishment methods.

When flat roofs fail, moisture enters the roofing layers, thermal performance is lost and the occupants are affected; the first thought is to strip, dispose and then replace the roof. However, this can have dramatic and costly effects for the building and its occupiers.

With the WOLFIN Solution, there is no need to strip and dispose of the existing roofing membrane, insulation or vapour control layer. The roof can be simply overlaid with the WOLFIN membrane. Due to the unique formulation and the black colour of the membrane, the roof layers rapidly heat up under the influence of solar radiation. This causes a high vapour pressure that gradually dries out the trapped moisture by forcing it up and through the Wolfin vapour permeable membrane. As the roof dries out the thermal properties of the existing insulation are restored.

Also, if required, this solution provides the opportunity to upgrade the thermal performance of the roof to meet the latest building regulations. Additional insulation can be added above the existing failed roof prior to the application of the WOLFIN system.

WOLFIN’s Sales Director Graham Kidd stresses the benefits of this evolutionary roof refurbishment solution: “The WOLFIN Solution is great for large refurbishment projects like hospital and school applications where minimal disruption and downtime are key priorities.

It has been proven to dry out existing failed roofs and the effectiveness of this physical process has been confirmed by recent scientific test results from the Fraunhofer Institute, Holzkirchen in Germany. Of all the thermoplastic roofing and waterproofing membranes available in the market, WOLFIN membranes offer the highest water vapour diffusion permeability, saving you and your client money, time and disruption.”

For more information on Wolfin visit www.wolfin.co.uk.



Guide to gutter maintenance

HD-Sharman1By Mark de Rozarieux, managing director of HD Sharman

Provisional Met Office figures released at the beginning of January showed that 2014 was the UK’s fourth wettest year since records began in 1910. Furthermore, five of the UK’s six wettest years have occurred since 2000.

Gutters are hostile environments, not only managing rainfall of increasing volume and intensity, but also accumulating silt, leaves and other materials, and they can quickly become blocked. Structural movement can cause them to corrode and leak. The joints, ends and outlets are areas of particular risk of failure.

Poor maintenance of the gutter can result in water ingress, a major cause of structural damage that is not only costly to repair, but which can also result in considerable disruption to the operation of a business.

Despite this, gutters remain an often-overlooked area of building maintenance.   Yet there are things facilities managers can and should do to ensure that the guttering of the buildings that they’re responsible for continue to perform to the highest standards:

1. Inspect regularly

Regular gutter inspection should be a standard part of every property maintenance regime, so that potential problems can be prevented and damage avoided. Inspections should be carried out at least twice a year, more if the building is situated close to trees. If the building features industrial gutters, the Metal Gutter Manufacturer Association (MGMA) recommends that gutters and rainwater systems should be inspected at least four times in their first year to help inform the preparation of the most appropriate future inspection and maintenance plan.

2. Look out for …

  • Blocked downpipes – These areas accumulate leaves and general detritus, and need to be kept clear to enable gutters to operate efficiently.   Leafguards can be employed to help prevent blockages.
  • Weak joints – The joints between gutter sections and around the downpipes are particularly prone to failure. The application of silicone-based liquid plastic over joints can help to extend the life of a gutter in the short term.
  • Corrosion – Remove rust and grime to check what lies beneath. Rust can result in the creation of tiny pits in a gutter, which grow overtime into larger holes.
  • Insufficient outlet capacity – Older gutter systems were built to handle rainfall of lower volume and intensity than we are now experiencing.   Consequently, increasingly outlets fail to efficiently drain rainfall from the gutter. More outlets or increasing the size of existing ones can reduce this problem.

3. What solution should I specify?

When faced with a leaking gutter, choosing the right solution can prove to be daunting as there are a myriad of leak repair solutions available on the market.   However, facilities managers can save time and money by educating themselves about the solutions available and specifying one that will prove effective in the long-term, not just a short-term ‘quick fix’.

‘Traditional’ methods of repairing leaking gutters involving mastics (resins), are not appropriate for larger projects, as they offer only short-term solutions, resulting in further leaks in future which themselves will require repair.

So, which solutions are the best?

One of the most popular methods of stopping leaks on gutters of various size and shape has been to reline the gutter with a waterproof membrane. Gutter lining presents itself as a lower cost solution than repairing the gutter itself, and gutter liners can often perform better than the original installation. A proven choice for contractors and facilities managers alike, gutter liners are easy to install and offer minimal disruption to the occupiers of the building.

4. Install appropriate gutter lining

Choosing which type of gutter liner to use depends on various factors including the condition of the exiting gutter, the weather and the severity of the joint problems to be addressed. The most reliable way to ensure long-term prevention of leaks is the installation of a free floating membrane gutter liner, a waterproof membrane fitted to the original gutter without structural work, so even if the gutter itself cracks, the lining remains intact, preventing leakage.

5. Selecting the right lining

In the UK, warm, dry weather can rarely be confidently predicted. This means that in order to guarantee installation at the specific time required a weather independent, solvent-free, gutter lining solution should be selected, rather than one that requires the application of adhesives which require warm, dry weather in which to set.

As for all construction specifications, look for a product that has acquired the approval of a recognised industry body, such as the British Board of Agrement (BBA). The BBA is a government-backed organisation, offering approval and certification for construction products and services that fall outside the parameters of British Standards kite marks.

Choosing the right gutter lining specification is vital, with the end result being the professional installation of a sustainable product that will ensure that your gutters are permanently watertight, and so help protect your entire property from water ingress into the long-term, helping to preserve the original structure.

Email: info@hdsharman.co.uk
Tel: 01298 812371


Odourless Kemperol liquid waterproofing and roofing at The Facilities Show

Liquid waterproofing specialist, Kemper System, will be showcasing its comprehensive range of BBA-certified Kemperol liquid roofing and waterproofing systems on stand N1300 at this year’s Facilities Show (16-18 June 2015), along with its Stratex warm roof system.

The only cost effective, solvent-free and completely odourless cold liquid applied waterproofing system available in the UK, Kemperol 2K-PUR will take centre stage on Kemper System’s stand.

Around 80% of the applied polyols (or resins) in Kemperol 2K-PUR are obtained from the seeds of the tropical castor plant (Ricinus communis) a renewable resource. Perfect for use on sustainable construction projects and ideal for live projects on occupied buildings, such as schools, hospitals, food factories or office buildings, Kemperol 2K-PUR allows work to take place without the need for evacuation or closure, avoiding the disruption associated with the strong odours and fumes from many ‘low-odour’ or solvent-based products.

Stratex from Kemper System will also be on show. An integrated warm roof that offers exceptional performance, Stratex is supplied as a complete system of matched components – vapour barrier, insulation and waterproofing. It is equally suited to concrete, timber and metal decks on new build projects as it is to refurbishing and upgrading existing roofs.  Stratex is also ideal as a complete warm roof solution below an extensive green roof.

First used at Volkswagen’s Baunatal factory in 1964, where more than 300,000sqm of roof surface have since been waterproofed, Kemper System’s Kemperol V210 completes the company’s FM showcase.  Kemperol V210 has been particularly effective at the factory in areas where ponding occurs owing to inadequate falls and continues to perform effectively to this day.

Comments UK marketing manager of Kemper System, Stuart Hicks: “Our product range is designed primarily for use in new build, maintenance and refurbishment projects. Kemper System’s waterproofing and surfacing products have protected billions of square metres of roofs around the world over the past 50 years, including some of the world’s most important landmarks, iconic buildings, public and commercial properties.

“As we continue to prioritise environmental performance in the built environment of the future, Kemper System’s advanced roofing technology can make roofs greener and more sustainable.

Further information www.kempersystem.co.uk enquiries@kempersystem.co.uk