U Value Of Thatched Roof

On this basis ceilings may require.

U value of thatched roof. Before considering adding insulation to a thatched roof know that thatched roof structure is usually covered with natural products such as straw as the most common one but also reed ferns and gorse. There are more than 60 000 thatched roofs in the united kingdom and over 150 000 in the netherlands. It is possible to reduce the overall u value by either increasing the depth of thatch or topping up loft insulation but both of these carry risk. Roofing concept is essential to make sure if you can have an eye catching and aesthetic outdoor design.

Types of roof differentiate by the material way to install and other factors. We are architects and have been asked how to work out a u value for an existing thatched roof which i have never tackled before. Contact us online give us a call at 877 912 2244 get a quote. In order to achieve a u value of 0 2w m k for thatched roofs the following was taken from cibse guide a3.

There are a few basic types of thatched roofs dictated by their covering. Straw thermal conductivity 0 07 and a resistivity of 14 3. Is there a basic simple method it is for an epc so it doesn t have to be absolute accurate just a basic idea. All of these areas have an effect on the performance of thatched buildings in terms of thermal and vapour therefore all components of the roof structure need to be built into any calculations reports.

Risks of improving a u value. The leaves that make up the thatched roof allow hot air to flow upward reducing heat and humidity. However the thatched roof is quite unique and old to applied. Reed thermal conductivity 0 09 and a resistivity of 11 1.

Given that thatch has a high r value a building s roof insulation can be significantly reduced if not eliminated. This gives a u value of 0 2 m k for 450mm of reed and 350mm of straw. Citation needed good quality straw thatch can last for more than 50 years when applied by a skilled thatcher traditionally a new layer of straw was simply applied over. Thatch is popular in the united kingdom germany the netherlands denmark parts of france sicily belgium and ireland.

When looking at sample reports and information care needs to be taken regarding the type and thickness of thatch used in the examples. Overall u values vary greatly according to thickness and density of the thatch in fact depending on the materials thickness and condition of the thatch some thatched roofs can come close on their own to meeting modern standards for thermal insulation. The u value of the roof will have to be upgraded to 0 25w m2k. Thatched roof often used for unique exterior design for new house model.

As a rule of thumb 10 of thatch has the same r value as 7 of fiberglass batt or an r value of r26 6.