COVID 19 – Message from Timofei Yeremeyev, Managing Director

The business is operating as usual.

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

Permavent at AFC Bournemouth vs Chelsea

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.















Diamond GRP: Flat Roofing Solution by Permavent

Specially Formulated Flat Roofing Products

diamond GRPPermavent 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:

    • Longevity: Advanced bonding characteristics and superior flexibility improves the roofs performance and is supported with a 25-year materials guarantee.
    • Robust and Durable: Excellent strength, versatility and waterproofing makes it ideal for extreme weather conditions and frequent footfall, where it can be specified for use on walkways and balconies.
    • Intuitive installation: Quick and easy to apply all year round, with excellent UV resistance.
    • Seamless Improved Aesthetics: No seams, joints or welds are required and creates an attractive finish. This also reduces labour time for the contractor and removes potential points of water ingress.

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.

Permavent Low Pitch Slate Roof Solution

“Ripping up the Rule Book” for Low Pitch Slate

Brecon DwellingThe 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.

Minimise Leakage

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.

Easy Slate not only revolutionises double lapped slating, when installed as part of the Permavent Easy Roof System it comes with a 40-year guarantee.

Permavent Breather Membranes

The Right Choice for Your Project

Broad MeadowIn 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:

  • The ceiling must be ‘well sealed’, as defined in BS 9250 (referred to as ‘continuous’ in BS 5534)
  • The ridge height must not be greater than 15 metres
  • The roof pitch must be between 12.5° and 75°
  • The site altitude must not be greater than 100 metres
  • There should be no significant site topography (as defined in BS 5534)

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.