Posts tagged ‘thatched property’
Continuing with their busy programme of thatched roof fire protection, TAS recently applied its Thatchsayf Fire Retardant Spray System to the thatched roof of a cracking garden retreat in Bedford.
The retreat was built and thatched by Harry Roberts who is based in Bedford.
We have a number of unusual (and more conventional) projects coming up shortly – provided the summer behaves!
Keep an eye out on the blog for details. If you have any questions about our fire retardant spray system or would like an ‘affordable’ quote & ‘professional service’ or require general thatch advice please contact us.
The recent good weather saw TAS out and about spraying thatched roofs across the country with their Thatchsayf Fire Retardant Spray System. First stop was Hampshire for a pair of lovely semi-detached cottages. The thatching was carried out by Ed Goodall last year. During the thatching TAS also installed the Thatch Alert chimney heat monitor system to both chimneys.
TAS recently carried out the application of its Thatchsayf Fire Retardant Spray System to a new build property, which is part of the Maudslay Park development – a new Retirement Village in the Warwickshire village of Great Alne. The thatched property is intended to be a shop for the village and provide warden accommodation. The roof which is approximately 210m² – 22 thatchers’ sq was thatched by Parkinson Master Thatchers.
Prior to the thatching, the roof benefited from the installation of the Thatch Fireboard Protection System comprising TAS100 Thatch Fireboards and 100mm of Thatchbatts®.
The application of the fire retardant was partly carried out using a boom lift (cherry picker). TAS operatives are licenced to operate boom and scissor lifts, which can often reduce the time it takes to treat a roof and also ensures close contact with the thatch. This also allows for greater control and coverage when treating the roof. You can see from this image where the Thatchsayf has already been applied.
There are approximately 60,000 thatched properties in the UK, of which 50-80 suffer a serious fire each year, most of which are completely destroyed. 90% of the homes struck by thatch fire have a combination of a wood burning stove either a flexible chimney liner or no liner at all.
Chimneys should be checked to ensure the brick or stonework is in good condition. Old or poorly maintained chimneys with loose or missing bricks & mortar and not lined, could allow hot gases and smoke to escape into upper rooms, the loft space or directly onto the thatch. If re-thatching works are taking place and the thatch around the chimney stack is removed, the thatcher will be able to advise on its condition.
Ensure chimneys are regularly swept by an experienced and qualified chimney sweep. This normally needs to be done at least twice a year, however if the chimney is used frequently during the winter period then additional sweeping may be required. Your sweep will be able to offer you further advice. Many chimney engineers and other specialist companies offer a CCTV survey, this is recommended to check the internal condition of the flue. Again check with your property insurer because some of them have a list of approved companies.
A number of thatch fires occur as a result of old or inappropriate flue liners, therefore chimneys serving either an open fire or multi-fuel appliance should be suitably lined. Contact an appropriate professional body such as HETAS so a registered chimney engineer can review the liner (if already installed) to ensure it is fit for purpose for the type of appliance or fire in use.
An engineer will also be able to advise on the condition of the liner and recommend on how often it should be checked. If you are considering installing a wood-burner or similar, again contact HETAS who will advise on the most suitable appliance and liner for the property.
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.
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.
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.
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
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 also had TAS100 Thatch Fireboards and Thatchbatts® installed prior to the thatching taking place.
The 230m² roof was treated with clear Thatchsayf.