However, you will definitely earn back the investment in the longer term (lower energy costs, lower insurance premiums). – A closed roof is more expensive than an open construction. – Since the method is quite new, we do not entirely know the life span of the substructure on the long term yet. + Large span with little purlins is possible ![]() + No draught or dust on the inside of the house + Higher fire safety than an open construction (premium is comparable to tiled roof) ![]() + Good insulation value (Rc value of 2.5 or higher is possible) In terms of finishing, you are free to choose the material you want. Moreover, this system leads to better insulation values than a traditional thatched roof. The fire safety has improved strongly and there won’t be any draught or dust at the bottom of the roof construction. This construction is, contrary to the traditional and ‘open’ working method, an important evolution in thatching. In case of a closed construction, one fixes the reed onto a closed surface (insulation boards, multiplex or underlayment). – Flammable, so a higher insurance premium and house insurance is required – A lot of dust at the bottom of the roof (without vapour barrier) – It is possible to install insulation, but it is not as easy as with a closed construction – Large waste of energy and draught (especially above a heated room) + The reed is visible on the inside of the house, which is considered an advantage by some people. + Good ventilation in the roof, so moisture can drain off well This roofing technique has been applied for centuries, although it is facing increasing competition from a more modern technique. ![]() The in- and outside of the roof are thus not strictly separated from each other. This roof type is characterised by an open space between the reed and the substructure, as a result of which air can circulate well. The reed is applied from bottom to top by means of special tools and galvanized sticks. In case of an open construction, the reed is tied onto so-called laths. So there are some substantial differences that you should take into account when determining the roof type. We can distinguish between two types of thatched roofs: a traditional open roof and a closed thatched roof. Go to: Types – Cost thatched roof – Maintenance – Construction & finishing – Realisations Generally, two constructions are possible in the case of a thatched house: the traditional open roof and the closed roof. A thatched roof gives a natural charm to a house reed as a roofing material especially fits well with rustic, traditional-style houses.
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