The Brunswick Shopping Centre in London required a refurbishment to bring it into the modern era. This included providing the waterproofing solutions to all the main piazzas, walkways and podiums. With over 50 years zero product failures Hydrotech Structural Waterproofing was installed, this included a build up of XPS Inverted Insulation and the Hydrotech Hot Melt itself. Beneath these piazzas is a cinema and car park, therefore waterproofing integrity was vital. Hydrotech Hot Melt Waterproofing is fully BBA approved.

structural waterproofing system

Above the Retail Units are situated residential dwellings of which the walkway areas also needed refurbishing. The existing deck was removed and replaced with a Derbigum Warm Roof consisting of Vapour Control Layer, Underlay and Derbigum Mineral Bituminous Cap Sheet. These walkways run above the whole length of the retail units below. Again, Derbigum Mineral Cap Sheet is fully BBA Approved.

For further information click here or call our Technical Team on (0) 3335 771 500

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Jul23

Alumasc’s BluRoof – frequently asked questions

Posted by Ashlea Williamson

Q1. Can we purchase an Alumasc Blue Roof outlet without the waterproofing?

Blue Roof build upAlumasc has developed the BluRoof system that benefits from the combined expertise associated with Harmer Engineered Drainage Systems and Alumasc Roofing Systems. The result is that Alumasc is ideally positioned to offer a single-source solution, fully warranted waterproofing and sustainable drainage solution that is integral to a system of this kind.

We do not offer drainage attenuation design as a standalone package to be used in combination with any non-Alumasc product.

Q2. What are the typical flow rates that can be achieved using an Alumasc BluRoof?

BluRoof is an engineered drainage approach that addresses the individual project requirements. Blue Roofs are calculated to a whole rainfall series not just a single value, as intensity will change with time and therefore providing a default flow rate without analysis is not practical.

Q3. What information is required to provide a Blue Roof calculation?

The following key project parameters should be assessed to ensure that they are taken into consideration within our calculation.

1. The total size of the applicable areas in m², and if any other areas are draining onto them, the size of them also. Roof plan
    preferably in .dwg format would be required if the size of area was not advised.

2. The plan size of the applicable void former area in m², if less than the total plan area.

3. Are there any height constraints that would restrict the depth of void former that can be accommodated within the
    proposed assembly.

4. Are there any project targets identified for the Blue Roof to achieve, for example:
    – A particular peak run off rate in litres per second (l/s).
    – The detention volume of water (m³) to be attenuated per roof area.
    – A particular % reduction in the site peak run-off rate

 

Alumasc offer a free Blue Roof design service and all enquiries should be sent to technical@alumascroofing.com

Blue Roof brochure download

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Q1. What is the fire rating of Alumasc Extruded Polystyrene?

Fire performance is declared Euroclass E under EN 13501-1. A flame retardant additive is also present that makes it capable to resist, for a short period of time, a small flame attack without substantial flame spread.

When ballasted with either 20/40mm grade aggregate (minimum depth of 50 mm) or fully-supported cast stone or mineral slabs of at least 40mm thickness, the roof may be considered to be of designation AA (low vulnerability in Scotland) and so is unrestricted by the national Building Regulations.

Q2. Are there any non-combustible insulations compatible with Alumasc roofing systems?

Two insulations rated separately as ‘non-combustible’ (i.e. class A1 to EN13501) are Foamglas and Rockwool Multi-Fix Dual Density Mineral Wool. Both products are compatible and available as a system within the Alumasc product offer as part of a warm roof assembly.

 

For further information about Alumasc’s insulations contact our technical team on 03335 771 500

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Q1. Can Hydrotech 6125 Monolithic Membrane be installed to Plywood?

There are no issues with the installation onto a Plywood substrate. As part of the preparation works it will be necessary to tape substrate joints with approx. 100 to 150mm wide strip of Flex Flash F laid centrally, bedded into a thin skim coat of Hydrotech Monolithic Membrane 6125 prior to main works.

Q2. What are the differences between the Hydrogard Protection Sheets used as part of the Hydrotech 6125 system?

Hydrogard 20 Protection Sheet is categorised as the standard grade product for use within an inverted roof assembly. It is a polyester reinforced, oxidised bituminous protection sheet, with a sanded finish to the upper side. Not suitable for application where exposed to Ultraviolet (UV) light.
Hydrogard 30 Protection Sheet is a more robust product suitable for use where the imposed loads are expected to be much higher. It is a glass/polyester reinforced SBS modified bitumen membrane, with a black mineral surfaced upper side.
Hydrogard 40 Protection Sheet is a heavy duty product incorporating a root resistant additive making it suitable for use within a green roof assembly. It is a polyester reinforced, APP modified bitumen, root resistant membrane, with a charcoal mineral upper surface.
Hydrogard 50 Protection Sheet is an extra heavy duty product principally engineered to meet the specific requirements and stresses for civil engineering works. It is a dual glass/polyester reinforced APP modified bitumen membrane, with a smooth black finished upper surface.

Q3. Can EPDM overlap Hydrotech 6125 Monolithic Membrane?

hot melt waterproofing systemThe use of EPDM flashings typically as part of a façade or cladding assembly which are required to overlap the Hydrotech 6125 waterproofing is common and a widely acceptable detail. The critical factor is ensuring that the EPDM product and its method of application will not have any adverse effect on a bituminous membrane i.e. by using a non-solvent based bitumen compatible adhesive. In the first instance the supplier of the EPDM should be asked to confirm in writing that the product will not have any adverse effect on the primary waterproofing system, which can then be further evaluated for compatibility by Alumasc technical services following receipt of appropriate product data sheets etc.

The effectiveness and bond strength of the product to the Hydrotech 6125 waterproofing is the responsibility of the adhesive product supplier to establish (by test if necessary) and confirm. As with any third party supplied products, it must be noted that should the product have any adverse effect on the Alumasc waterproofing at any time, any costs for any remedial work found to be necessary would not be covered by the Alumasc warranty.

 

For further information about Alumasc’s Hydotech 6125 click here or contact our technical team on 03335 771 500

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Q1. Can Alumasc provide written confirmation that concrete tolerance and deflections noted within structural engineers report are suitable?

The acceptability of the level of deflection of a concrete deck is a matter for the client, the main contractor and the structural engineer to determine in accordance with the prevailing standards, regulations and codes of practice as identified in the National Structural Concrete Specification for Building Construction. Standard construction tolerances for concrete surfaces are generally acknowledged as having no deviation of more than 9mm over a 3m length, or any abrupt irregularities of more than 3mm. Deviations in excess of this definition are the responsibility of the client or their appointed agent to rectify.

Where deemed unsatisfactory, correction of any slab outside tolerance resulting in a negative fall would be recommended to ensure that all design parameters are sustained throughout the lifecycle of the roof, and should ideally be brought within standard construction tolerance and noted.

Q2. Can Alumasc provide a solution for the localised correction of concrete tolerance and/or deflection?

Alumasc Monoscreed is a fast curing PMMA based compound screed specifically engineered for this purpose. The cold applied compound can be mixed at roof level and applied from 3mm to 50mm in order to bring levels back to acceptable tolerance. The system is unaffected by ambient temperatures, is rainproof within 15 minutes of being applied and will fully cure in circa 45 minutes, thus offering significant programme benefits when compared with more traditional screeds.

 

For further information about Alumasc’s Monoscreed click here or contact our technical team on 03335 771 500

Deck deflection screed brochure download

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With recent events in the UK highlighting the requirement for compliance with up to date and relevant fire test standards, Alumasc Roofing Systems have conducted further fire tests on the market leading Derbigum high performance bituminous membrane warm roof system.

 

Fire rating certificate

Derbigum Mineral and Derbigum Black full warm roof built up systems including primer, vapour barrier, adhesive, insulation, underlay and Derbigum cap sheets recently underwent rigorous testing to CEN/TS 1187:2012 – Test methods for external fire exposure to roofs (part 4) and ultimately achieved the highest grade, BROOF(t4) in fire safety available in the UK, which allows unrestricted use under the Building Regulations (see Approved Document B Section 14: Roof Coverings – clause 14.5 table 16).

ENV1187 Test 4 is a test method used to determine the performance of flat roofs to external fire exposure, the two-stage test method replicating exposure to burning brands, wind and supplementary radiant heat.

Exova Warringtonfire Gent conducted the tests in their brand-new facility in Belgium, confirming not only the applicability of original Derbigum fire rating tests but also confirming the compliance of the current warm roof build-up using the latest BBA Certificated Derbigum system, to reflect real in-use performance.

Alumasc understands the importance of this issue, having previously achieved top fire ratings to the previous standard (BS 476 pt3) on these products, and we, therefore, took the initiative to ascertain the fire rating of our latest systems in anticipation of tighter regulations governing the fire resistance of construction products.

Fire tested roofing membraneThis certification underlines Alumasc’s reputation for quality, performance and reliability, our aim being to provide our customers with unrivalled peace of mind when utilising our products and take all the steps necessary to facilitate this, including this certification which is designed to protect property and life from fire.

Specifying certificated products, systems and services in support of fire safety and security of any facility demonstrates due diligence and shows consideration for those that invest, develop, design, manage and use Alumasc’s Roofing Systems.

 

Legislation and the requirement for compliance to enter new markets has never been tougher and Alumasc will continue to develop and test their products to ensure we provide the highest levels of safety to not only our customers but the inhabitants and users of the buildings our products help to protect.

For further information regarding Warrington Certification click here

For further information about Alumasc’s waterproofing systems click here

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The RIBA National Awards are given to buildings across the UK recognised as significant contributions to architecture – Alumasc’s Hydrotech high performance structural waterproofing was used on four winning buildings – Kings Cross Triplets, Riverlight, the Leadenhall (Cheesegrater) building, and the V&A Museum, highlighting Hydrotech as the ideal choice when selecting long-term durable waterproofing for high profile prestigious projects.

 

Here we take a look at the projects.

Kings Cross Triplets

Kings Cross Triplets, London, 5,000m².

 

Riverlight, London

Riverlight, London, 23,000m².

 

The Leadenhall Building

The Leadenhall Building, London, 1,400m².

 

The V&A Museum

The Victoria and Albert Museum, 1,200m².

Hydrotech is the premier hot melt system for high performance green roofs, podiums and highly detailed waterproofing schemes, and has been used worldwide for over 50 years, with an astonishing record of zero product failures. The structural waterproofing system is BBA approved and contains an impressive post-consumer recycled content of 30%, making it the choice of professionals in an ever-growing sustainable environment. Not only does Hydrotech contain sustainable raw materials, it also uses hydro-electric power as the primary energy source in manufacture.

For further information click here or call our Technical Team on (0) 3335 771 500

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One of the most common causes of green roofs underperforming is insufficient application of irrigation immediately after the plants have been installed. With the UK’s variable weather conditions we can experience long periods of unseasonably dry weather when normal levels of rainfall cannot be relied upon to provide sufficient moisture for the plants to establish into the growing medium.

 

Irrigation systemTherefore, Blackdown Green Roofs recommend a period of temporary irrigation directly after planting for all extensive and semi-intensive systems to ensure the newly installed green roof has the best possible start in life. Without this short but important period of irrigation – usually between 6-8 weeks – a green roof will struggle to establish, be more prone to erosion, and could look less visually appealing. Once this period has expired the irrigation is removed and the system will support the plants without further intervention. The only exception to this is when a roof has a pitch of more than 30 degrees.

Blackdown has a variety of irrigation systems to suit a range of roof areas, whether it is ten or ten thousand square meters.

 

Irrigation systemOur Systems

1. are fully or semi-automatic so that once set up they will irrigate a roof without any input from the client

2. are small enough to be carried up internal stairs, external hoists or even lifted through windows

3. require mains water i.e. a roof or ground floor ¾” bib tap

4. can operate from 110 or 240v power or, if either of these aren’t unavailable, a 9v battery

 

 

 

irrigation system by BlackdownConstruction, Design and Management Regulations

Under the Construction Design and Management Regulations (CDM) 2015, appropriate measures should be taken at both design and construction stages to ensure safe access and passage over the planted roof areas for maintenance personnel.

Health and Safety

It is strictly the contractor’s responsibility to ensure all works are executed in accordance with current health and safety legislation. Guidance must be taken from relevant and current HSE publications. Refer to current HSE publication ‘The Working at Height Regulations’ for further guidance.

 

Irrigation systemAccess and Egress

Access and egress routes to/from the roof need to be carefully considered. Ideally, these should be discussed and agreed between client/end user and Blackdown Green Roofs before completion of the installation phase if an irrigation contract is required.

Safe access across the roof could take the form of perimeter balustrade, a post and wire fall prevention system or a collapsible roof perimeter handrail.

Should you wish to discuss your project requirements with Blackdown please contact us on 01460 234582

 

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Jul2

Irrigation of Intensive Green Roof Systems

Posted by david.luukas

The total absence of or the provision of inadequate irrigation systems is one of the commonest reasons for planting failures on green roofs, or within planters. Here we take a quick look at some of the pressures and solutions for providing much-needed irrigation to our green spaces, but with an emphasis on green roofs.

Well irrigated intensive green roof

With increasing urbanisation and higher density living; planners, landscape architects and architects are trying to provide more affordable, high-quality, desirable living spaces that each have a sense of unique identity, these locations very often incorporate green spaces or green elements within their designs. This is all well and good, however, without providing the necessary elements for the plants to thrive, i.e. light, water, oxygen, carbon dioxide, nutrient and a means to anchor their roots, no matter how well-meaning the intentions are the long-term performance of the trees, shrubs or vegetation is undoubtedly compromised.

So why do we see so many planters incorporating trees and hedging that could quickly exceed these basic requirements for growth – least of all water?

There are numerous permanent irrigation solutions available on the market, supplied either as part of the planter solution or as optional extras – these can either be automated or manually operated. Why go to all the expense of providing a planter and planting and possibly missing out on years of enjoyment for a small increase in the installation cost?

Permanent Irrigation Components

Typically, but not necessarily exclusively, a permanent irrigation system includes the following components

1. Mains water and power
2. Tank, pump and housing
3. Control box or programmer
4. Water feed pipes, solenoids and associated signal cabling
5. A means of applying the water i.e. drippers or pop-up sprinklers
6. Finally, training!

There’s little point in offering an automatic irrigation system unless the operator understands how to program and operate the controls. Training for the FM provider or client is very important unless the irrigation system is operated remotely by a third party via the web.

This all might sound a bit complicated and another problem to think about but you might be surprised at how compact and simple some of the systems are. Blackdown would be happy to offer any advice and discuss your requirements with you.

Built-in Irrigation Reservoirs

Roof tree planterAlternatively, if your pockets don’t stretch to an automated system, then there are many other non-automated solutions that could make a big difference to the performance, health and longevity of your planting – provided that there is a maintenance provider to actually manage them, regularly.

By specifying the correct green roof system or planter to suit the final planting density and, very importantly the carefully considered plant, applying sound annual horticultural practices; such as mulching, feeding, a structured maintenance programme and installing the plant at a size that enables it to slowly acclimatise itself to its new environment can mean less reliance on expensive permanent irrigation systems.

 

 

Should you wish to discuss your project requirements with Blackdown please contact us on 01460 234582

 

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Jun11

30-year old plus flat roofs still going strong

Posted by david.luukas

Alumasc Roofing Systems’ Derbigum bituminous membranes provide over 40 years durability and last year gained updated BBA certification confirming this. However, prior to the updated certification being published over 700 million m2 of Derbigum products have been installed worldwide since 1932. This proves the immense reputation the Derbigum product holds amongst specifiers throughout the world.

We have looked back at some flat roofs that have been installed over 30 years ago which are still performing as if they were installed yesterday, from around Europe.

 

Examples of 30 year plus projects:

Arcelor-Mittel, Dunkirk, 260,000m2. Install date: 1975

 

H1, Hill of Rubislaw, Aberdeen, 1,000m2. Install date: 1983

 

Arcelor-Mittel, Mardyck, France, 225,000m2. Install date: 1973

 

Motor Parts, Sint-Pieters-Leeuw, Belguim, 3,000m2. Install date: 1983

 

These projects demonstrate the undeniable strength, durability and peace of mind that has been provided to specifiers for almost 90 years.

Derbigum continues to grow its range to meet current market needs, heavily focussing on sustainability. Derbigum’s latest market-leading technologies include Derbigum Olivine – the CO2 neutralising bituminous membrane, through to the highly durable Derbigum VAEPLAN single ply.

Initially, Euroroof (now part of Alumasc) provided a 10-year guarantee back in 1977. These were the early years of the APP Derbigum waterproofing membranes. The product was unique in structure and composition. Nevertheless, the quality of the polymers and bitumen have improved, and over the years our knowledge of the raw materials have increased dramatically, therefore Derbigum continues to evolve.

The long-lasting properties of Derbigum are also due to high levels of quality control, next to the selection of our raw materials. Suppliers Derbigum have a very extensive quality control during and after production.

Alumasc have evolved this offer and now provide a full 40-year service and support offer for installed Derbigum flat roofs in the UK – our promise provides clients, developers and contractors with complete confidence and long-term peace of mind in the roofing system specified on their project.

Ultimately, if the quality of installation is not of the highest standards projects will not survive as long as hoped, therefore, Alumasc provide fully trained, registered contractors on all their project installs in order to ensure the correct and long lasting installation is provided.

 

If you would like a copy of the Derbigum BBA certificate click here

If you have a project that may benefit from a Derbigum flat roof system or have any queries please contact us today on 03335 771 500 or email info@alumasc-exteriors.co.uk

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