Our Technical Manager Richard’s posts with useful tips and advice, technical know-how and the latest industry standards are some of our most popular. Today he shares information on how we can make sure our floor contributes to a healthy home.
Did you know that our prefinished floor boards, lacquers and oils have all been certified under the Danish Indoor Climate Labelling Scheme? It’s fair to say that relatively few customers in the UK know about this scheme – but when they find out they are usually impressed by how useful it is!
For anyone who wants to know about the hidden risks of chemical emissions, including carcinogens from materials that are used in their buildings, and anyone with allergies to certain substances, the certificates can be a useful source of information. Choosing certified products will reassure clients that safe materials are being used.
The scheme was devised by the Danish Minister for Housing in 1993 and since its inception it has been operated by the Danish Technological Institute. It’s used for interior finishes like that of our floors, as well as furniture, fittings and other building materials.
What makes the Indoor Climate Labelling Scheme different from a simple list of chemicals or standard EU product labelling is that the test procedure measures the emissions over a period of 30 days. The test sets maximum allowable limits for each chemical and measures how much the levels reduce over time. In order to comply, the sample must never exceed the maximum allowable limit during the 30 days and must have fallen below defined limits at the end. For some materials the tests also look at the release of fibres and dust particles and their effects upon people’s health.
We believe this scheme has a high level of integrity and credibility because it’s administered by a non profit making organisation. Participating companies (like Junckers) pay an annual fee which is used to meet the day to day running costs of the scheme, and to help to promote it.
When we talk to customers about Indoor Climate Labelling they are invariably interested, and this is perhaps not surprising with environmental and health issues currently so high on the agenda. These certificates are a valuable selling tool and from the responses we have received so far there appears to be a real benefit in proactively introducing these into the conversation with our customers, and not wait for them to ask!
To find copies of Junckers Indoor Climate certificates click here.
For more information, please contact our technical department, tel 01376 534 729 or by email
A large expanse of our Nordic Oak Boulevard flooring forms part of this extraordinary new archive and research facility in Cornwall. Designed by Purcell, the UK’s leading heritage and conservation architects, the centre is a landmark development comprising public search, exhibition, education and workshop spaces.
Set within a UNESCO World Heritage Site and Conservation Area, Kresen Kernow is housed in formerly derelict brewery buildings, rebuilt and redeveloped whilst carefully conserving many of the historic original features. The new, purpose-built facility brings together a staggering 1.5 million manuscripts, books and documents relating to the history, people, places and culture of Cornwall, dating back to 1150. The centre also includes a new two-storey environmentally controlled archive store with many, many miles of racking.
Purcell retained many of the buildings’ remaining structures and restored elements of the interior. Based on historic records, original cast iron columns were salvaged and incorporated in a new steel frame and brick gable walls at high levels were reinstated. For the floor, the original granite flagstones were carefully lifted and re-laid, installed alongside Junckers’ solid wide board oak flooring in a white-pigmented Nordic finish.
A technically challenging installation, flooring contractor Tre Concepts had to work within an accuracy of 0.6mm to allow for the varying sub floor levels as well as the difference in levels of the granite slabs. Around the rectangular sections of granite, the 185mm wide floorboards were cut lengthwise to form frames around the slabs as per the architect’s design.
David Burne, Senior Architect at Purcell and the project lead said: “Solid hardwood flooring was chosen as it is a sustainable, natural product, with a long life and low maintenance requirements. The Nordic Oak was selected due to its warm appearance and light colour characteristics which complement the tones of the historic granite slabs adjacent, whilst enhancing the natural illumination of the main exhibition space and visitor reception area.”
The 20.5mm thick solid wood floor forms a durable surface for a public space and a fitting backdrop to the strong visual appeal of the interior. A floor from Junckers can be sanded and refinished up to ten times. A long lifespan, PEFC and FSC certified and produced in a CO2 positive facility, means specifying a Junckers floor is an environmentally sound option.
Our New Era Ultraslim System can be laid with a build-up of only 60mm from the base to the finished floor level. This is achieved with a specially designed low-level cradle and 22mm thick battens. The new system is ideal for replacement floors and refurbishment projects where the subfloor may be uneven and the floor finish height is restricted.
For uneven subfloors, a height range from 60mm to 72mm is achievable. Our New Era Ultraslim system provides a “sprung” floor when used in combination with Junckers 22mm solid hardwood floor boards. It’s been fully tested and certified to EN 14904 category A4 for area elastic multi purpose sports floors.
The new cradle is called the “S Zero”. System data:
For 411mm Batten Centres:
– Batten size: 22mm x 45mm x 2400mm; Junckers Laminated spruce battens, 2.7m of batten required per sqm of flooring. – Cradle centres: 300mm, which equates to 10No cradles per sqm of flooring – Maximum thickness of packing in cradle; 12mm – Uses standard range of New Era plastic packing pieces for levelling; 1.5mm, 3mmm, 6mm and 12mm sizes.
Cottrell + Vermeulen Architecture has designed new, bright and airy postgraduate accommodation for Churchill College, Cambridge with interiors featuring Junckers’ solid maple flooring. Cottrell + Vermeulen won a competition to design the new buildings, 16 years after the studio completed a housing scheme on a neighbouring site.
The 35 new units of accommodation comprise five studio flats and 30 en suite rooms with spacious communal areas on each floor, spread across three buildings. The design builds on the original architectural scheme, designed as an extension to CVA’s previous work on the site. The architects sought to recreate the warmth and brightness of the original college rooms from the 1960s and found our maple flooring a good match.
The choice of two-strip boards, where two staves of wood make up one floorboard, was also a reference to the narrow boards used in the original rooms. The naturally pale tone of the maple floor is matched by joinery in birch faced plywood to form a comfortable and welcoming space, ready for students to move into at the start of the new academic year. The floor was installed by our Approved Contractor VA Hutchison Flooring.
Quiet floors in multiple occupancy buildings
An important consideration for student accommodation is how impact sound travels through floors
from one dwelling into another. Building regulations set out minimum standards for impact and
airborne sound through floors which apply to residential buildings and buildings converted to new
uses, including hotels and care homes.
The floor finish will usually act in combination with other elements of the building to achieve the
target levels of sound insulation. The design of the subfloor and ceiling beneath play an important
role, as does the way the floor finish may need to be isolated from the walls that surround it, but
there is no question that the right acoustic floor will control the transmission of impact sound.
We have a range of acoustics systems available which comply with building regulations. The newly updated New Era acoustic system is a height adjustable system for use on structural concrete slabs, block and beam floors and almost any other type of sound, dry load-bearing base.
The New Era system uses acoustic cradles with 10mm thick recycled rubber pads, factory-fitted to
the underside. The cradles are height adjustable using purpose-made packers, supporting laminated
timber battens. 50mm thick mineral wool insulation is placed between the battens and Junckers
20.5mm or 22mm thick solid wood floorboards are fixed to the battens to complete the installation.
The use of 36mm thick battens achieves an impact sound reduction of 27dB; and a 48mm thick
batten achieves an impact sound reduction of 28dB, thus complying with building regulations.
For Junckers 14mm thick sold wood flooring installed with Junckers’ Clip System, an impact sound
reduction of 19dB can be achieved with Junckers’ 5mm thick CA2 Acoustic Underlay, loose laid with
the floorboards installed on top as a floating layer, no fixings required.
All our floor system specifications are available on NBS Plus and draft NBS clauses are available on request. We also provide BIM Objects for all systems. Junckers solid hardwood floor systems are guaranteed for 25 years when installed by a Junckers Approved Contractor. Junckers Approved Maintenance Contractors offer a care scheme where the client’s floor is periodically inspected and maintained so as to keep the floor in good condition and to maximise its life.
The historic Aberdeen
Music Hall has been restored and redeveloped by architects BDP. The Category A
listed concert hall has been completely refurbished and now includes a
performance studio, creative learning space and a café/bar.
Nearly 1,500m2 of our solid Nordic Beech Classic flooring has been fitted as part of the transformation, including in the impressive 1,300 seat auditorium, which now has step-free access to all levels. Nordic Beech with its white pigmented finish offers a light and bright backdrop to the interior and makes the most of the new architectural lighting by reflecting an abundance of light.
By specifying the same floor for much of the building, the various spaces are seamlessly connected by a unifying element. At 140mm wide, Junckers’ signature wide board, long-length floor boards really come into their own in the open spaces and circulation routes, offering a clean and elegant look. Solid beech is amongst the most hard-wearing timbers used for flooring and our pre-finished floors are well-known for their durability.
In his series of articles highlighting technical issues to do with wood flooring and woodcare, our Technical Manager Richard Aylen explains how wood dyes and colouring processes work
One of the many reasons why beautiful timber floors have been around for so long is that they blend perfectly with many styles of interior. In common with other natural materials, timber may be used next to a wide variety of other colours and textures. The colours that nature provides are very familiar to most of us, but we can create even more choices by using stains, textures and colouring processes.
What options are there if you’re looking for a floor with a coloured finish? It might be a new floor or refurbishment of an old one – there are a few popular choices, each with its own pros and cons.
For refurbishments, a decision must be made if the products to be used will be from one manufacturer that are guaranteed to work together. Alternatively, there is the option to “mix and match” using wood dye from one supplier and lacquer from another. If the latter method is chosen, the flooring contractor needs to guarantee that the products offered are compatible. If in doubt, always do a test area and be aware of the risk that manufacturers sometimes alter formulations… so what works today may not necessarily work tomorrow. The timber species may also affect the result. Some water-based finishes may not perform well on naturally oily tropical hardwoods, but will be perfectly fine on traditional species such as oak and ash.
Let’s look at some of the choices that are available for customers who want to add colour their floors.
These will usually be water-based and used instead of a clear primer. As well as providing the desired colour, the primer will reduce the “gluing effect” that can occur with water-based finishes. A good, and very popular, example is Junckers Prelak White.
Primers provide an even, transparent “wash” effect and work well on wood that may have a patchy finish if a conventional wood dye is used e.g. maple or beech. Skill and care are needed during application to avoid overlaps, especially on darker, parquet style floors. The primer needs to be over-coated with clear lacquer and it is safest to use a lacquer recommended by the primer manufacturer.
Not strictly a coloured finish; “Invisible” primers and lacquers are fairly new to the UK market. They are used where the final colour of the floor needs to be as close as possible to bare sanded wood. Their “invisibility” works in two ways; one, that they have a very “flat” matt surface which gives the impression that the wood has no coating. Secondly, they change the colour of the wood very little. That said, these are often normal properties of many water-based primers whether marketed as “invisible or not. Best results are achieved on light coloured timbers as some colour change will be seen when applied to very dark woods.
These are low-solids, fast drying products, not to be confused with coloured varnishes or “wood stains”. They must be protected with lacquer. The “rule of thumb” is that if the wood dye is organic solvent-based, a water-based lacquer is most likely to be suitable for overcoating, and vice versa. This must not be fully relied upon though, and a test area should always be done prior to treating the whole floor. Often, the lacquer used to over-coat the dye will be from a different manufacturer.
Dyes are easy to apply using a cloth or pad and it is fairly easy to avoid overlap marks etc. They are fast drying, so the first coat of lacquer or primer can be applied soon after. Bear in mind that stained floors may be difficult to patch repair – especially if the colour has faded over time and may appear patchy on certain types of wood eg maple, beech.
Oils often produce a uniform colour on beech, maple etc. compared with wood dyes. They tend not to be prone to application issues such as roller stop marks and work well on herringbone and parquet floors. Oil can be used on its own or may be used as a primer and then over-coated with lacquer. Check that the oil is compatible with lacquer – some are not. Junckers Rustic Oils may be used either as a full treatment or over-coated with HP Commercial lacquer. Oils tend to have a longer drying time than a primer or wood dye.
The Effect of Sheen
Many customers will prefer matt finishes on textured and
coloured boards as this tends to look more natural, although this is largely a
matter of current taste.
Vacuum coloured floor boards
For a very consistent and permanent coloured finish, some types of timber lend themselves well to vacuum staining. Here, the colour of the wood itself is altered by using a chemical or staining process. This affects the board through the majority, if not all its thickness. So when the floor is sanded there is no need to re-apply the colour treatment. Fumed oak, or Black Oak, is perhaps one of the better-known examples of this. Junckers has also used this process on beech to make its Sylvaket boards, and has extended the process further by vacuum staining with water-based wood dyes.
The ever-increasing choice of finishes has led to an increased demand for ‘the perfect shade’, a perfect match to another design element of the interior. It’s always important to assess the use of the floor, estimated foot traffic and maintenance issues before recommending one choice or another – that’s where the expertise of a professional flooring contractor comes in. Our network of Approved Flooring Contractors and Approved Maintenance Contractors might be able to help!
Architects Dixon Jones specified 600m2 Junckers solid oak flooring for Marlborough Primary School, a multi award-winning building on a densely populated urban site in the Royal Borough of Kensington & Chelsea in London.
The brief to create a primary school much larger than the original Victorian building on the existing
site challenged Dixon Jones to design a school where teaching accommodation is arranged
vertically around a series of cascading roof terraces. With nursery and reception classes on the
ground, children progress upwards through the building the older they get, with the junior years
arranged on the upper floors.
The interior forms an equally dynamic environment for students and staff with teaching spaces arranged around communal halls and generous circulation areas. A large main hall and multi-use space flooded with natural light from two central roof lights, features Junckers wide board oak flooring throughout, providing a natural, unifying backdrop. Junckers’ FSC and PEFC certified floors are a durable, long-lasting choice with low lifecycle costs. Made in solid wood, the floor can be sanded and re-finished multiple times without losing its good looks or performance, ideal for a thriving community school.
Main contractor: Mace; Joinery contractor: Swift Crafted; Photography: Paul Riddle.
Spanish City pleasure dome, a Grade II listed building which has been completely transformed and restored in 2018. It features an incredible domed ceiling in a rotunda, with a large open space and a circular balcony plus three restaurant areas elsewhere in the building – all fitted with Junckers’ Black Oak floor.
We’re absolutely delighted to announce that together with our Approved Contractor Stenhouse Flooring, we have won the 2019 Contract Flooring Journal / Contract Flooring Association Award for ‘Best use of flooring in a visitors attraction’ with our Spanish City pleasure dome project.
An extraordinary project with a complicated flooring installation featuring a concentric dodecagon pattern where the lines of the flooring on the balcony continues in the circular floor on the level below. On the balcony, the mitred boards run from column to column and downstairs from columns on the outer circle, where there is a step down, towards a centre point in the middle fitted with a small section of paler oak (just visible underneath the grand piano in the main image). There are 12 identical sections that form the circle, each segment overhung, angles adjusted to fit perfectly with the previous piece, mirrored in all sections. Every mitre was hand cut and hand routered, grooved with false tongue so the whole floor is connected. Over 2000 cuts in total. On completion a final coat of finishing oil was applied by hand.
The work to approximately nine weeks and required two highly skilled floor layers. The floor is finished with Junckers oil to allow for spot repairs without much downtime and minimal disruption.
The Lima 2019 Pan American Games are in full swing! After the Olympics, this is the second largest sporting event in the world. We’re proud to have supplied our A3 Portable Sports Flooring for the Games, already being put to good use as the basketball teams battle it out on court.
A total of 2800m2 our 22mm solid hardwood flooring complete with a fully sprung area elastic sub-construction has been installed on two basketball courts, and will be used again for one wheelchair basketball court and one wheelchair rugby court at the Parapan American Games which take place 23 August – 11 September.
Working with installation partner Recoma of Brazil, Junckers’ Technical Team were on site during the 12-hour overnight installation. During the Games, the floors will be taken up and moved twice, complete with line markings and customised with the Games’ logos each time.
Junckers A3 Portable Sports Floor made in solid beech offers a professional, flexible option for a wide variety of sporting events. The flooring system fully conforms to EN 14904 standard with good shock absorption and ball bounce and works perfectly when a low construction height is required. A portable, professional grade sports floor from Junckers can be used again and again; an ideal choice as many of the large arenas used for big sporting events are temporary structures.
Metropolis, one of Norway’s leading interior design and interior architecture
firms, designed their own offices in central Oslo, the design concept took them
on a journey around the world, bringing different cultures, colours, sounds and
smells under one roof to create an inspirational, creative working environment.
dividing the space into different zones, which each have a different feel and
purpose – flexible working stations both for teams and individuals; dedicated
project and meeting rooms and a more relaxed and informal section which serves
as a material library and social area, Metropolis created a workspace which in
itself is a ‘tool’ in their creative process.
solid Black Oak Herringbone flooring has been installed throughout, an elegant
floor for an elegantly designed space. We especially adore the confident
pairing of our dark floors with dark walls, continued in the furniture, wall
panelling, accessories and more.