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U-Values & Condensation in thatch

Thatch Roof Rafters

U-Values & Condensation in thatch
Modern living under thatch has changed in the last 10 to 15 years, with the introduction of modern central heating, double/secondary glazing, power showers and more home owners wanting fully vaulted ceilings. In addition, the requirements and associated recommendations from Building Control and insurance companies see the requirement for fire barriers and increased levels of insulation to be installed within the roof structure.

All these areas can have an effect on the performance of thatched buildings, therefore all components of the roof structure need to be built into U-Value calculations/reports.

U-Values are expressed in units of watts per degree of temperature difference W/m²K. Overall U-Values will vary according to actual thickness and density of the thatch. For example:

  • 300mm thickness of Water Reed – 0.29 W/m²K
  • 300mm thickness of Long Straw – 0.23 W/m²K

For comparison, the standard in Part L of the Building Regulations (2010) for replacement roof insulation at rafter level is 0.18 W/m²K.

A suitable insulation product to help achieve a U-Value of 0.18 would be Thatchbatts® as they are non-combustible, high density slabs which also offer additional protection in terms of fire resistance.

Vapour Control
It is widely accepted in the construction industry that in addition to sufficient levels of insulation, vapour control layers are required to control vapour and reduce the risk of condensation. A correctly fitted vapour check will also play an important part in the way the building continues to perform in the long term.

Bespoke U-Value & Condensation Risk Analysis reports can be generated for thatched roofs and will take into account the design and construction, type of materials used and location within the country.

See the Thatching Advisory Services website for further information and product details.

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Thatching Advisory Services – New Website

Thatched cliff-top shelter overlooking Seaton beach

Thatching Advisory Services (TAS) recently launched it’s new website. The new site contains the latest information on fire protection as well as comprehensive advice on buying, owning and maintaining thatched properties. There is a new section devoted to new builds and extensions which includes detailed information on roof construction and the latest building regulations.

There is comprehensive information on all our products and systems and a new facility to buy the products via our online shop.

Have a look around the site and feel free to contact us with feedback or if you have any further questions or queries.

www.thatchingadvisoryservices.co.uk

 

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Thatchsayf – Thatched Cottage

Thatched Cottage - front

Thatching Advisory Services, whilst taking advantage of the recent warm weather, continued their busy schedule of treating thatched roofs with Thatchsayf fire retardant with a comprehensive application carried out to the roof of the Thatched Cottage  in Shedfield, Hampshire.

The 220m² roof was treated with clear Thatchsayf.

For further details about Thatchsayf fire retardant, please give us a call on 08455 204060.

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Thatchsayf – Stream Cottage

 

 

 

 

 

 

 

 

 

 

 

 

Thatching Advisory Services recently completed the application of Thatchsayf fire retardant to Stream Cottage in Glynde, East Sussex.

The Grade II listed cottage is one of the oldest in the Glynde parish, dating back to 1556.

Prior to the new thatch, the roof structure also had TAS100 Thatch Fireboards and Thatchbatts® installed.

The 127m² roof was thatched by Gavin MacDonald Master Thatcher

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Thatchsayf – Bilbrook Cottage

Bilbrook Cottage - front

Thatching Advisory Services have been out and about recently treating a number of thatched roofs with their fire retardant – Thatchsayf.

Mid-July saw Gary go off to Portadown in Northern Ireland where Master Thatchers (North) Ltd recently completed a full re-thatch of the roof at Bilbrook Cottage.

The cottage, which is one of Portadown’s oldest – dating back to 1642 – was extensively damaged by fire in April 2013.

The cottage also had TAS100 Thatch Fireboards and Thatchbatts® installed prior to the thatching taking place.

The 230m² roof was treated with clear Thatchsayf.

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New Meeting room at Thatchers Cider

Thatching Advisory Services - Thatchers Cider

A new meeting room currently being built at Thatchers Cider has been designed to showcase sustainable construction techniques. With that in mind, the Sandford cider maker asked Somerset master thatchers, Dunbar & Bunce to install a new thatched roof.

Passionate about conservation, both Tom and Nigel – together with their team of highly skilled thatchers, provide an extremely knowledgeable and sympathetic approach to both historic buildings as well as modern applications, such as new houses and extensions.

It is being built with a solid oak framework and natural stone walls. Prior to the actual thatching,  the roof  timbers were covered with Thatch Firewall Membrane, which is one of the fire barriers provided by Thatching Advisory Services.

Martin Thatcher, Managing Director says, “Our new meeting room is being built in the heart of a beautiful part of one of our orchards, in a thicket, overlooking a pond. It is an opportunity for us to show how we embrace nature. Beinyears.”

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TAS asked to write for Listed Property Owners Club Magazine

Rob Norcott of Thatching Advisory Services was asked by Listed Property Owners’ Club Ltd.  to write an article for latest magazine.

Listed Heritage Magazine is published by the Listed Property Owners’ Club for their members. This is a full colour, perfectly bound A4 production; it is published bi-monthly and distributed to 19,000 listed property owners. The Listed Heritage Magazine includes amongst other things: suppliers directory, members letters, shopping pages, events and properties for sale.

The 4 page piece was centered around the importance of separation in construction on thatched roofs. The article also takes you through common causes of thatch fires, from old or faulty electrical systems through to bonfires or fireworks. It also discusses the various systems and preventive measures available such as Thatch Fire Board System, Thatch Fire Wall System; the use of Thatchbatts® and the Thatchsayf spray.

To see the full article click the link below:

TAS article for Listed Heritage – Issue 95

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Thatching Advisory Services – New Safety Advice Leaflet

Good advice for your thatched property.

During recent times we have seen an increase in the number of calls from people who are in the process of purchasing a thatched property and are looking for more detailed advice; covering areas such as chimneys, electrical systems, insurance providers, and much more to include the names of local thatchers.

In light of the increased requirement in the industry for more advice, we have updated our safety advice leaflet. The new leaflet gives guidance on areas such as chimneys, wood burning stoves, electrical systems, detectors & alarms and fire barriers.

Over the coming weeks we will be supplying thatcher’s with copies of the leaflets so that if required, they can hand out these to home owners.

Thatching Advisory Services - Safety Advice Leaflet

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Dorset Model – Technical guide to planning requirements for thatched properties.

Dorset Model

Thatch is enjoying a resurgence. Architects, builders and owners increasingly acknowledge the advantage of thatch insulation and aesthetic qualities. Recognising this increasing popularity the eight building control authorities throughout the county of Dorset reviewed current building controls for a thatched roof.

The result of these controls will:

  • Either protect the main structure of the building if a fire occurs.
  • Or provide better protection for the roof members if a fire occurs.
  • Require an acceptance to treat the thatch as sacrificial in a fire.

Companies specialising in thatch roof insurance welcome the “Dorset Model” and recognise that it will reduce the premiums paid.

www.thatchingadvisoryservices.co.uk/Dorset_Model.asp

 

 

 

 

 

 

 

 

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Thatchbatt® The Real Thing!! from Thatching Advisory Services.

---- Imitation Flyer - April 2014.

TAS has recently embarked on a campaign to highlight the authenticity of one its products – Thatchbatts® and has sent out information highlighting the levels of testing and approvals that the product has gone through.

In summary, when specifying a non-combustible insulation product for a thatched roof, this needs to been done on a like for like basis and therefore careful consideration should be given to the specification. Thatchbatts® are a vital component of both the TAS-Thatch Firewall & TAS-Fireboard systems.

For more information about Thatchbatts® or other Thatch Fire Barriers, please contact Thatching Advisory Services on 08455 20 40 60.

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