- Breather Membrane
- Easy Roof System
- Skytech Pro XL
- Diamond GRP
- Case Studies
- Find a stockist
Natural slate has long been considered to be one of the most environmentally friendly building materials in the world. Slates have the lowest carbon footprint and least environmental impact of any building material because there is very little to the extraction and manufacturing processes. Other materials, for example, ceramic products, need high temperature firing in furnaces, meaning they consume far more energy to produce than slate does.
Once installed on the roof, natural slate remains totally inert, with no chemical emissions; it retains its strength and colour, and easily withstands adverse conditions such as heat, cold, wind, and rain. Good quality slates are unrivalled in their service lifespan; with proper care and maintenance, a slate roof can last in excess of 100 years. Probably the other roof materials, such as timbers and metal fixings, will deteriorate long before the slates do, which is why there is such a ready market for second-hand slates.
Of course, the way in which slates are traditionally installed on a roof is quite labour-intensive – this is true of all double lapped roofing products. There are limitations to the way in which natural slates can be installed, with known relationships between slate length and width, headlap, side lap and roof pitch to ensure water does not find its way through the slating. BS 5534: the British Standard Code of practice for slating and tiling, provides guidance on minimum headlaps, side laps, rafter length, and roof pitch to ensure that the slates perform correctly in resisting rainwater ingress and wind loads.
But, what if natural slates could be installed in a way that reduces labour costs and, at the same time, allows their use on roof designs that previously was not possible? The Permavent Easy Slate system tears up the rule book when it comes to roof pitch and slate laps. Easy Slate has a unique system of side interlocks, channels and water bars in the form of a strip that fits under each joint, preventing water from creeping sideways, enabling slates to be used on roof pitches as low as 12 degrees. The slates are still installed in a double lapped pattern, so there is no discernible difference in appearance on the roof. This all means, particularly for low pitched roofs below 30 degrees, that slates headlaps can be reduced and so less slates are required, further reducing the environmental impact of the finished roof.
We have some extremely efficient underlays, such as the Permavent DRY vapour-permeable and condensation-control membrane. Permavent DRY incorporates a super absorbent fleece that is designed to capture a high level of condensation which may form within the roof space at peak periods during the day. It then slowly releases this as water vapour out into the batten cavity.
Once the water vapour has passed into the batten cavity, it must be removed to prevent excessive condensation forming on the slate battens and undersides of the slates. The Easy Slate system increases the gap slightly between each slate, not only eliminating capillary water creep, but also encouraging air flow between the outside atmosphere and the batten cavity. This further improves the efficiency of the Permavent DRY membrane in removing unwanted condensation from the roof structure.
To complement the Easy Slate system, Permavent also offers unique verge, valley, and side abutment systems to eliminate the need for mortar bedding.
Easy Verge is a continuous dry verge system for slates and is a great alternative to mortar bedding at the verge. The system has unique rubber super seals to prevent water ingress. It is quick and easy to install and provides a neat and unobtrusive finish to the verge. The system keeps water away from the slate batten ends and prevents water from running over the verge edge.
Easy soakers are suitable for all natural and artificial double lapped slates and incorporate our unique flexible super seals on high grade high impact plastic, which self-seals over the nail fixings. The system is available as individual 350mm long units (Soaker Singles) or as a continuous unit 3 metres long (Easy Soaker). The system is quick to install, and at up to 80% cheaper than traditional lead soakers is very cost effective.
Easy Valley is flexible and versatile and incorporates a central upstand which ensures water cannot run from one roof face and flood the opposite side, with highly efficient water channels to drain the water safely to the gutters.
In summary, the Permavent Easy Roof System provides an ideal, discreet low-impact solution for all slate roofs as low as 12 degrees on domestic, commercial and heritage properties. The system has been rigorously tested at the BRE and is approved by LABC and NHBC, and comes with a 40-year guarantee.
At Permavent, we are committed to innovative roofing design, maintaining the highest professional standards.
Our bespoke CPD presentations are created to address your specific roofing requirements, and can even be tailored towards a project you are currently working on. CPD seminars are currently being conducted virtually via Zoom at a time that best suits you.
Our CPD presentation is suitable for a wide range of audiences including:
The Permavent Easy Roof CPD seminar is a 45-60 minute presentation covering the key aspects of traditional pitched roofing design, focusing on the benefits and pitfalls of slating and plain tiling. The CPD will allow you as decision-makers to make innovative design choices which will help maximise space, maintain aesthetics and improve the performance of your roofing project.
Topics covered in this seminar are:
Trading Update January 2021
Following the latest UK Government’s announcement that construction sites will remain open during the third national lockdown, Permavent will continue to support our customers by trading as normal.
We are also pleased to announce the launch of our bespoke virtual CPD presentation, showcasing our unique and innovative Easy Roof System for low-pitch roofing. For more information, please contact your area sales manager. Alternatively, you can request a CPD via submitting your request here.
Permavent customers and staff were winners at a 2-2 draw between AFC Bournemouth and Chelsea on Saturday 29th Feb.
As a thank you to customers for their loyal support, Permavent hosted a table at AFC Bournemouth’s Vitality Stadium to watch the match against Chelsea.
The day kicked off with a drinks reception followed by a 3 course meal. The match was an entertaining to and fro with Chelsea taking a first half lead. Bournemouth responded with 2 goals in the second half, but were unable to hold on for a win with Chelsea snatching a late leveller in the 85th minute.
The day was rounded off with the Permavent team and guests having a memorable photo opportunity with The Cherries man of the match Jefferson Lerma.
Permavent are expanding their extensive range of innovative roofing products with the release of a new advanced GRP roofing system that provides the perfect solution to the construction industry for flat roofs.
The ‘Diamond GRP System’ offers exceptional quality for flat roofing as it has been specially formulated solely for roofing applications.
Traditionally GRP systems were designed for marine use, such as boats and aquatic tanks. When applied to a roof the finished result was often very brittle and unforgiving, lacking the durability and flexibility required. This in turn decreases the overall life expectancy.
Diamond GRP eliminates these issues with its formula specifically designed for roofing and delivers enhanced benefits:
Diamond’s exceptional performance and value for roofing, contrasts many existing products on the market that offer ‘one size fits all’ solutions. These aim to be suitable for multiple platforms which, in turn, often diminishes the overall quality and life span.
The Diamond GRP System includes base resins, topcoats, matting, trims and accessories.
The system also includes specialised products:
‘Fire Retardant Topcoat’ (Fire rating: BS476: F.AC) – a ready-made formulated fire rated topcoat that provides unrestricted use under building regulations, without the need for additional slate granules.
‘10m2 Roof Kit’ – A complete set of materials required for a 10m2 roof all in one box, a convenient option for smaller projects and DIY users.
Accessory Kits – A handy selection of all the general tools and buckets required to apply a flat roof.
Full range of Diamond GRP products can be found here.
The Permavent Easy Slate system rips up the rule book when it comes to roof pitch and slate laps. A unique patented system in the form of a strip that fits under each slate joint, prevents water from creeping sideways. Easy Slate vastly improves the performance of the slates, enabling roof pitches as low as 12 degrees. The slates are still installed in a double lapped pattern, so there is no discernible difference in appearance on the roof.
Traditional double lapped slates have been keeping buildings weathertight for 100’s of years, so the relationships between slate length and width, headlap, side lap and roof pitch are well understood. BS 5534: the British Standard Code of practice for slating and tiling, provides the rules by which we can work out the minimum headlap, side lap and roof pitch for any roof anywhere in the UK.
As rainwater runs down a slate roof, it runs into the gaps between each slate, with a slate below each gap to catch the water and drain it to the next course of slates below. Water is also drawn between the slates through capillary action and can run downward, sideways and even upwards. Gravity acts on the water, so it is not drawn as far by capillary on a steep pitch as it is on a lesser pitch, consequently steeper pitched roofs are more efficient in keeping the water out.
To minimise leakage through the slating, there must be limitations, dependent on the size of slates, on roof pitch and rafter length. But even so, during a roof’s service life, which can be 40 to 60+ years, there will be weather events in which water will penetrate the slating. If this happens with any frequency, there is a risk of long-term damage to the roof sub-structure, battens and fixings. .
Easy Slate increases the gap slightly between each slate, not only making water creep through capillary action far less likely, but also encouraging better air flow between the outside atmosphere and the batten cavity. This improves the efficiency of the vapour or air-permeable underlay in removing unwanted condensation from the roof structure, something particularly important for slates that have smooth surfaces, for example, fibre cement slates. Also, the higher airflow through the slating increases the security of the slates against wind uplift as a larger proportion of the wind load is then borne by the underlay.
In the UK all breather membranes are classified by wind zone, with the country being divided into 5 wind zones. The lowest wind speed, Zone 1, is centred around London and the south of England, through to Zone 5 covering the very far north of Scotland. When choosing an underlay, designers and installers must be mindful of the list of criteria that apply to the Zonal tables.
These are as follows:
If a project falls outside any of these parameters, the wind load may be higher than the Zonal table maximum load resistance. In these cases, a wind uplift calculation is required to determine what strength the underlay needs to be. If in doubt, please contact us for further assistance.
Permavent Max All Zones and Permavent APeX membranes are suitable for use in all UK wind zones, therefore, designers and installers can have complete confidence in their use anywhere in the UK. Max All Zones can be used without tape in any wind zone. Permavent Apex 2 TX can be used in any zone as it comes with 2 integrated tapes.
Permavent Max is a vapour-permeable underlay, produced using the latest technology to encapsulate hydrophobic film inside spunbond polypropylene layers. Because this is done in a combined 3 in 1 process, rather than simple bonding the different layers together, quality and integrity are vastly improved and Permavent can rightly claim its products to be ‘best in class’ with superior strength, breathability, flexibility and durability. At 150 grams, Permavent-MAX has been tested and certified by BRE as suitable for all UK wind zones with laps either taped or battened.
Permavent APeX is a high-performance underlay, manufactured using a unique induction bonding process that achieved superb air and vapour permeability results when tested by the BRE. Consequently, it is approved by NHBC for use in new-build cold roof applications without any additional roof space ventilation. It is also ideal for use in warm roof constructions without any additional roof space ventilation.
In addition, Permavent APeX, at 180 grams per square metre, has been tested and certified by BRE as suitable for use in all wind zones throughout the UK when installed with taped laps, with integrated tape making installation a quick and easy process.