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Posts tagged ‘TAS’

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Paradise Farm

Paradise Farm

Photo Credit: Richardparr.com

Paradise Farm is thought to be the largest thatched private dwelling in Europe. The roof is approximately 1,675m² – 180 thatchers’ square. The entire roof structure was covered with TAS100 Thatch Fireboards. The boards are 9mm calcium silicate and offer a one hour fire rating. The underside of the rafters were completely filled with a 150mm depth of Thatchbatts® which offer additional fire protection and ensure all acoustic and thermal values are met.

 

 

 

 

 

 

 

 

The thatching was carried out by Ian Parkinson of Parkinsons Master Thatchers.

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Thatch Fire Protective Membranes

There are many fire membranes on the market which claim to be ‘suitable for use beneath thatch’.

Are they suitable? What’s the difference?

Nearly all fire membranes are PU (polyurethane) coated.

PU28 is often asked for and is widely used to describe fire barriers within the thatching industry. PU28 was used as a development code for a new membrane product and this code has stuck with many membranes to this day.

There are many formulations for a PU coating, some more economical than others. Some are solvent based, while most standard PU finishes would certainly fail a smoke & toxicity test.

A thatch fire membrane, PU or other may have a BS type test. What test? The testing it carries may not be an indicator of a product’s quality as some tests are not as robust as others and may not be reflective of the environment in which the product is used.

Waterproof, water resistant and breathable.

Waterproof can be defined as an objects’ capacity to be impervious – water won’t get in.

Water resistant means water isn’t going to get in easily.

Breathable

An often used but nonsense adjective. Membranes cannot breathe.

A ‘breathable’ membrane (or breather membrane) is water resistant and air permeable. The majority of air permeable products will have a high moisture/vapour transmission rate but will not breathe.

Check if a product is classified as both waterproof and breathable. If stated, this is incorrect. It will be one or the other – it cannot be both!

TAS – Thatch Firewall Membrane

Manufactured in the UK.

Looks and feels similar to a PU28 type membrane but with a far superior coating – a temperature resistant aluminised polymer system.

Tested beneath a combustible material - thatch - to meet both BS476-3:2004 & BS EN 13501-5:2005.

Designated as Broof (t4) – the highest performance in accordance within the European class – BS EN 13501-5:2005, which refers to four separate tests. The suffix (t4) indicates that Test 4 is to be used for the purposes of Approved Document B (Fire Safety) B4 External fire Spread.

Water resistant and tested for air and water vapour permeability.

Tested to meet the same smoke and fire toxicity specification for commercial aircraft. These are just a few of the tests carried out on the  TAS Thatch Firewall Membrane.

When considering a PU28 type fire barrier for use beneath thatch, it is worth asking a few more pertinent questions to ascertain its suitability.

For further details and information about TAS Thatch Firewall Membrane, please call the office.

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Fire retardants for thatched roofs

Statistically homes with a thatched roof are no more likely to catch fire than those with a conventional tile or slate roof and nationally represents a small percentage of house fires.

However, the results can be devastating and losses can be extremely high as many thatched properties are listed which invariably leads to higher repair costs. Thatch roofs are designed to repel water making them more difficult to extinguish, which can result in increased damage to the entire property.

There are many measures to reduce the risk of fire one of which is treating the roof with a fire retardant spray.

Which retardant?

A water-based solution of fire retardant and intumescent chemicals in a polymer emulsion binder specifically formulated for the protection of thatch roofing. It should be environmentally friendly with no detrimental effect to plants or animals and of course have no adverse reaction to the thatch.

Fire retardants for thatched roofs should not contain any borates or borate-based additives.

Application

Fire retardant sprays should be applied by trained personnel using high-pressure specialist equipment to treat not only the thatch surface but also the thatch stems to ensure a degree of protection for a number of years.

All too often fire retardants are applied to just the outer surface of the roof (often with a garden-type sprayer) only for them to ‘run-off’ due to the liquid repelling nature of the thatch.

The application should be carried out at a certain pressure using a specific tip spraying upwards into the thatch coat work at the angle of the roof ensuring penetration of between 50mm and 75mm.  This will ensure the fire retardant is applied to both the surface and thatch stems.  On an older roof or specific types of thatch, the pressure can be reduced.

When to apply?

There should be no rain for a minimum of four hours prior to applying a fire retardant, ideally the roof needs to have been exposed to direct sunlight for two hours prior to the application.

Due to the high levels of moisture in the air during the winter months the application is normally carried out between the end of March and at the very latest, depending on the long-range forecast, the end of October. After this time, the damp conditions can slow the curing process and leave the roof more vulnerable to the risk of a rain shower during this time.

Thatchsayf is a water-based solution containing fire retardant and intumescent chemicals for the protection of thatched roofing.

When applied correctly, Thatchsayf penetrates the stems of the thatch by up to 75mm and will also form a thin protective film on the surface of the thatch stems.

On exposure to heat, Thatchsayf will foam (intumesce) and form a carbonised char, binding the thatch stems together, cutting off the supply of oxygen to the fire and delaying the spread of flame and lowering the radiated heat output.

Thatchsayf is environmentally friendly, can help prevent bacterial and fungal growth and has no detrimental effect on the thatch.

What are the benefits?

  • Reduced insurance premiums
  • Fire penetration delayed for over 30 minutes
  • Can be applied to new or existing thatched roofs
  • Prevents bacterial and fungal growth inc. moss
  • Application is fully certified

A roof treated with Thatchsayf will offer protection from a number of fire risks, including sparks, ejected embers, bonfires, Chinese Lanterns, fireworks and barbecues.

Thatchsayf is tested to BS476: part 3: 2004 and achieved the designation of EXT.S.BA.

Once a roof is treated, the homeowner will be issued with a Certificate of Completion, which can then be issued to Architects, Building Control Officers, Insurance Companies etc. as proof that the thatch has been correctly treated with Thatchsayf. Certification is valid for 5 years before re-application is required.

Many specialist thatch insurance recognise the application of Thatchsayf and will offer a reduction in premiums to those taking a pro-active approach in reducing the risk of fire.

The application of Thatchsayf is undertaken by trained and approved contractors using a high pressure spraying system. This ensures that the correct pressure and coverage is applied to the thatch.

A typical roof should take no more than a day to treat and will dry within 3-4 hours.

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Thatch Fire Barriers – LABC Registered

Thatching Advisory Services (TAS) have two proven thatch fire barrier systems: Thatch Fireboard System and Thatch Firewall Membrane System - both systems are approved and listed on the Local Authority Building Control (LABC) Registered Details database. LABC registration is a one-off certification process proving compliance with building regulations and standards across the UK.

The registered details database contains various products and systems, which once certified, are accepted by LABC building control surveyors in over 300 local authorities across the country. This assures the whole construction industry that a product or system has been rigorously checked by LABC surveyors.

Full details on both systems can be viewed via the LABC links below:

LABC – Thatch Firewall Membrane System

LABC – Thatch Fireboard System

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Thatched new builds in Somerset

Bovis Homes

The first of two new thatched properties in the South West are almost complete.

Bovis Homes included the properties as part of a development near Wookey Hole in Wells Somerset.

The first was thatched by Nigel Bunce of Dunbar & Bunce Master Thatchers.

The 130m² roof has a tiled ridge which is often seen on many thatched roofs in Holland.

Prior to the thatching the roof timbers had TAS100 calcium silicate thatch fireboards fitted and 50mm Thatchbatts® installed between the rafters.

The second property is expected to start early in the New Year.

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Thatchsayf Fire Retardant – Oxford

East Hendred

TAS recently carried out the application of its Thatchsayf fire retardant to a lovely thatched new build in East Hendred, Oxford.

The 350m² (38sq) roof was thatched by Fowler and Sons Master Thatchers Ltd.

Prior to the thatching, the roof timbers were covered with 9mm calcium silicate TAS100 Thatch Fireboards and 200mm Thatchbatts® will be fitted between the rafters on the underside of the fireboards. The Thatch Fireboard System meets the Dorset Model and has LABC approval.

      

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Fire in Thatch Properties with Wood Burning Stoves

The Fire Protection Association (FPA) recently released its long awaited report into the causes of thatch fires - Fire in Thatch Properties with Wood Burning Stoves.

The report, sponsored by Historic England and the NFU Mutual details the work and research carried out to understand the key factors that may contribute to thatch fires when using a wood burning stove.

The FPA also produced new guidance for owners of thatched building with wood burners and multi-fuelled stoves. The guidance list key actions that homeowners should take to reduce the risk of fire.

The author of the report, Dr James Glockling, the NFU Mutual and Historic England are happy for us to distribute the information.

The report and guidance are available here:

Fires in Thatched Properties with Wood Burning Stoves 2018

Guidance for owners of thatched building with wood burners and multi-fuelled stoves

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The Farmers Arms – Thatchsayf Fire Retardant

IMG_2268

TAS recently completed the application of Thatchsayf Fire Retardant to the Farmers Arms in Combe Florey, Somerset.

The pub was completely gutted by fire in January 2017 and it is believed that an ejected ember or spark was the cause. The roof is around 250m² and was thatched by Richard Pascoe and his team.

Prior to thatching, the roof timbers had TAS100 Thatch Fireboards fitted and 100mm Thatchbatts® installed between the rafters. The refurbishment was carried out by Les Joint Building Contractors.

The pub is due to re-open later this year.

 

 

 

 

 

For further information about Thatchsayf Fire Retardant, please see the link below.

http://www.thatchfireprotection.co.uk/thatchsayf-spray-system-thatch-fire-retardant/

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Highways – Thatchsayf Fire Retardant

Highways

TAS recently completed the application of Thatchsayf Fire Retardant to the recently renovated ‘Highways’ in Cheshire.

The 160m² roof was thatched by Paul Draycott.

For further information about Thatchsayf Fire Retardant, please see the link below.

http://www.thatchfireprotection.co.uk/thatchsayf-spray-system-thatch-fire-retardant/

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The Cider House – Thatchsayf Fire Retardant

The Cider House

TAS recently completed the application of Thatchsayf Fire Retardant to the newly built Cider House on the Willow Farm Estate in Heveningham, Suffolk.

The house was built by Sixsmith Build and the roof thatched by Marcus & Ben Thompson.

Prior to thatching, the roof timbers had TAS100 Thatch Fireboards fitted and 100mm Thatchbatts® installed between the rafters.

 

 

 

 

 

For further information about Thatchsayf Fire Retardant, please see the link below.

http://www.thatchfireprotection.co.uk/thatchsayf-spray-system-thatch-fire-retardant/

 

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