Simon Denney Master Thatchers are proud to work in conjunction with the fire service, offering safety models in aid of fire prevention and training. The advantages of the Dorset Model are time and protection. This could save lives, personal items and our heritage. We believe this is extremely important, which is why we only use the best products on the market.
- Rafters are to be overdrawn with a minimum 30 minute fire barrier (integrity and insulation) and this barrier should also be water resisting. 50 x 25mm battens are recommended on a micro-porous boarding to allow the thatch to breathe. (Dorset Fire and Rescue Service recommend a 60 minute barrier under the thatch for property protection).
- The chimney, including the pot, should terminate at least 1.8m above the height of the ridge. Due to the risk of condensation forming as hot gases cool, the chimney pots should be limited to a maximum height of 600mm.
- A domestic mains and battery powered, interlinked smoke alarm system will be required with one smoke alarm fitted in the roof void. The system should generally be in accordance with that specified in Approved Document B.
- The written comments of the adjoining property owner will be requested by the local authority for consideration.
- A terrace may not consist of more than three thatched dwellings together.
In addition to the measures that may be required by Building Control there are a number of recommendations that you should carefully consider at an early stage.
Reed = thermal conductivity 0.09, and ‘r’ 11.1
Straw = thermal conductivity 0.07, and ‘r’ 14.3
This gives a ‘U’ value of 0.2w/m2K for the following thickness
The use of a flexible material as a fire resisting barrier is not considered acceptable for the purposes of the Dorset Model
Tests carried out by The Thatch Register Limited