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Roof window FAKRO FTT U8 Thermo | Passive glazing

✔ Wood | white painted ✔ centre-pivot (bottom handle) ✔ 4-panes ✔ Window U-value: 0.58 W/m²K ✔ Glazing U-value: 0.3 W/m²K
Old price: 17.031,25 kr ( 13.625,00 kr excl. VAT and shipping)
13.625,00 kr inc. VAT, excl. shipping
(10.900,00 kr excl. VAT and shipping) You save: 2.725,00 kr (20%)
Choose the roofing material, making sure that your window will be completely weathertight

Ships within 15 business days after receipt of your payment

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FAKRO FTT U8 window with innovative structure, characterized by superb thermal performance and air-tightness is suitable for air-conditioned rooms with mechanical ventilation systems as well as passive buildings. It offers very good overall heat-transfer coefficient for the whole window, guaranteeing significant energy savings. The glazing unit is set in a specially designed sash frame, which offers wider wooden profiles in comparison with standard windows. The window is equipped with five seals. Such structure minimises thermal bridging and provides improved window insulation. FTT fönster offers modified locking mechanism without the traditional locking assembly. After turning the handle, the sash is securely locked in two sides of the frame. The sash is opened like a pivot window, however axis of rotation of the sash has been raised by 7cm in relation to its geometric centre. Thanks to it, even a tall person can comfortably stand upright by the open roof window. The opened sash can be stopped anywhere between 0° and 40°, because it is supported by an innovatory assisting mechanism. The mechanism balances the forces resulting from the length differences between the upper and lower section of the sash. Large sizes and innovative structural solutions applied in FTT roof windows, ensure high comfort of use of the loft space as well as unobstructed access to the open window.

FTT U8 Thermo window equipped with a tripple-chamber U8 glazing unit, supplied and installed with EHV-AT Thermo flashing is characterised by the excelent U-value Uw = 0.58 W/m²K, which makes it one of the most energy-efficient roof windows on the market.

Installing large, highly energy-efficient FTT windows brings many advantages. The sizeable glazed area ensures effective lighting of the loft and spacial structure applied insulates the interior, thus protecting the room from cooling. The FTT window allows energy from the sun to be harnessed as the solar radiation can pass through the glazing, even in the winter on sunny days, to provide a radient heating effect in the room. The heat is trapped inside the room as glass with low emission coating prevents it from escaping. For this reason, in the winter, rooms in the loft are partially heated in a natural way.


  • The sash frame is thicker in comparison with a standard window,manufactured in pine,vacuum impregnated and double coated with acrylic lacquer;
  • Tripple-chamber passive glazing unit;
  • Warm TGI spacing frames; the combination of two materials, plastic and metal, along with a proper TGI frame shape, guarantees high tightness and low heat permeation;
  • Glazing seal provides additional tightness in extreme weather conditions and reduces the micro pulses of the cladding profiles during heavy rain;
  • Easy way of cleaning the outer pane and awning blind installation when sash rotated through 180 degrees and locked with bolt;
  • Increased anti-burglary resistance- topSafe system;
  • Installed in roofs with pitches between 15° and 70°;
  • Wide range of accessories;
  • 10 year warranty period.

Glazing Unit U8:
Super energy efficient used in passive hauses

Triple-chamber U8 glazing unit 4H – Tg12Kr – 4HT– Tg12Kr – 4HT – Tg12Kr – 4HT, consists of four panes of glass. The whole unit incorporates three layers of low-emission coating and warm TGI spacers. Three inter-pane voids are filled with inert gas – krypton. Such structured glazing units provide superb thermal performance Ug=0.3 W/m²K.


Flashings are essential for the correct installation of roof windows. Precisely designed flashing details ensure a durable and tight fit with the roofing material used. The purpose of flashing is to ensure good drainage away from the window and to provide protection from the elements.

FTT U8 Thermo window is supplied and installed with EHV-AT Thermo flashing is characterised by U-value Uw = 0,58 W/m²K, which makes it one of the most energy-efficient roof window on the market. As standard it is also equipped with XDK insulation flashing kit, which consists of XDP insulation and XDS air tight sets. The XDK set enables fast and proper installation of thermal insulation, air permeable and air tight membranes around the window.

Technical specification of the FAKRO FTT roof windows

FTT roof windowsFTT/U roof windows
Inside color / outside color:
Natural (wood)
Grey (RAL 7022)
White (NCS S 0502-Y)
Grey (RAL 7022)
Pine wood coated with 2 layers of transparent lacquerPine wood coated with 3 layers of polyurethane varnish
FAKRO roof window name:
Window U-value [W/m2K]:
Uw = 0,58Uw = 0,80Uw = 0,81Uw = 0,58Uw = 0,80Uw = 0,81
Acoustic insulation [dB]:
Rw = 36 (-2;-5)Rw = 38 (-1;-4)Rw = 42 (-2;-4)Rw = 36 (-2;-5)Rw = 38 (-1;-4)Rw = 42 (-2;-4)
Glazing type and glazing U-value:
Quadruple glazing U8
Triple glazing U6
Triple glazing R3
Quadruple glazing U8
Triple glazing U6
Triple glazing R3
Inner glass:
4 mm2x 3mm, laminated (class P2A)2x 3mm, laminated (class P2A)4 mm2x 3mm, laminated (class P2A)2x 3mm, laminated (class P2A)
External glass:
4 mm, toughened4 mm, toughened4 mm, toughened4 mm, toughened4 mm, toughened4 mm, toughened
Inert gas filled panes:
Warm TGIWarm TGIWarm TGIWarm TGIWarm TGIWarm TGI
Air inlet type (air flow [m3/h]):
Installation range (roof slope) :
15° - 70°15° - 70°15° - 70°15° - 70°15° - 70°15° - 70°

Roof windows

  • Wood | white painted
  • centre-pivot (bottom handle)
Window U-value:
0.58 W/m²K
Glazing U-value:
0.3 W/m²K

Fakro FTT roof window leaflet (Fakro_FTT_leaflet.pdf, 520 Kb) [Download]

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FAKRO företag

FAKRO är ett privatägt familjeföretag. Det grundades 1991 och är numer bland de största takfönstertillverkarna med snabbast utveckling i världen. Vårt mål är att leverera högkvalitativa loftprodukter som uppfyller våra kunders krav över hela världen. Med detta mål i åtanke, värnar vi om våra kunders hälsa och säkerhet samt om miljön.

FAKRO-gruppen är:

  • Fakro är den ledande eller näst största aktören på takfönstermarknaden världen över.
  • En av de ledande takfönsterleverantörerna I världen med ca 15% marknadsandelar.
  • Över 3000 anställda.
  • Har mer än 100 000 m² produktionsyta (12 produktionsenheter världen over).
  • Fakro har 12 distributions företag (USA, England, Frankrike, Spanien, Tyskland, Österrike, Holland, Ungern, Ryssland, Ukraina, Slovakien, Kina).
  • Har over 30 000 m² lageryta.
  • har ett utbyggt distributionsnätverk i alla länder där det finns en efterfrågan på takfönster.
  • har ett modernt forskning- och utvecklingscenter (mer än 30 konstruktörer)
  • Äger patent på många lösningar samt har ett flertal patentlösningar under granskning.


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