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FAQ
-- Why should I prefer wooden windows and doors;


> Because wood has beauty, warmth, quality and elegance. Wood is a product of the Nature, it offers a different character in the space for centuries and no other material has ever achieved to replace it.

Apart from these insurmountable properties, wood offers:

A- Top thermal insulation. As a material, it has 1700 (!) times greater thermal insulation capacity than aluminium.

B- Excellent soundproofing. Sound studios and concert halls use wooden surfaces for soundproofing and for the absorption of the reflection of the sound.

C- Excellent mechanical and structural properties. Today, with the technology of combined multi-layer timber (3-layer, etc), pieces of wood do not warp. Apart from large openings in windows even roof beams covering openings up to 130! meters are manufactured without intermediate columns in stages, large halls, plants etc. SITRA windows and doors provide a written 15-year guarantee for warping. (More on Timber)*


D- One of the fundamental advantages of wood is that it through maintenance it becomes new again. SITRA wooden windows and doors will look and be like new whereas windows and doors made of synthetic materials need replacement because they cannot be maintained.

E- SITRA wooden windows and doors are nowadays cheaper than the respective aluminium ones. The comparison should be made per similar window (e.g. 2-leaf window 120cm width X 150 cm height), for similar thermal insulation co-efficients (e.g. the thermal insulation co-efficient, in the above dimension, for SITRA windows in the basic model is Uw = 1.8W (m2.K). *
If we make a comparison with a perspective of 15~20 years, wooden windows and doors are definitely cheaper than any other material. Even if the comparison is made with more cost effective windows and doors, this is not true, because the difference will be paid in multiple ways for energy, by paying for oil or electricity.



*   SITRA windows and doors can achieve a thermal insulation co-efficient of Uw = 0.79W (m2.K).  (More on Technical Characteristics)





 -- What is the cost of maintenance on wooden windows and doors and how often does it need to be performed?


-> Maintenance as it was known until to date on SITRA windows and doors no longer exists. The technology on the varnishes of the windows and doors of RENNER’s top coat series, as well as the electrostatic coating that is applied today by a robot at  SITRA, offers such extraordinary quality and resistance to time, rain and air, that we can provide a 10-year written guarantee.

The varnishes of top coat series that we use are water soluble, impregnating, waterproofing and their elasticity (300%!) allow the final surface, that is an elastic membrane, to follow the contractions-expansions of the wood so that it does not tear and peel off. The sole care your windows and doors need is to be wiped twice a year with a simple cloth using the special liquids we provide you for the cleaning and protection from the ultraviolet rays of the sun.
The cost of the basic maintenance on SITRA windows and doors is minimal. Every 10~15 years, the wood needs routine maintenance in order to become new again. This maintenance is performed only at the external side of the windows and doors with the simple application of a special jelly, without any rubbing or scratching with sandpaper or anything else, by a non specialized workman (See technical characteristics - maintenance). A house with 20 windows and doors needs 2 to 3 days to become new again with a total cost of less than ˝ a tone of petroleum (More on Thermal Insulation)!


 
-- Which type of wood should I choose?


-> The selection of the wood to be used for the construction of your windows and doors is very important. Each type of wood is appropriate for specific constructions, thus the types of wood that are used for the construction of windows and doors are specific. (See windows and doors specifications)  During the last years, some types of tropical timber have been used, such as Meranti, Niangon, Sipo, Sapeli etc, because they combine low content of resin, high resistance to weather conditions and low frequency of infection by wood eating insects and fungus. Apart from those, in our country, the following are also used to an extensive degree: Oak, Ash, Pine, etc. In SITRA, we use certified imported timber of excellent quality. The type of wood you will finally select between the aforementioned appropriate types is your choice, depending on the appearance you wish and, of course, on the cost. For example, there are types of wood with intense fiddleback that provide a more traditional style and other ones with more neutral fiddleback. In addition, the type of wood that you will choose is directly connected with the type of coating you wish. If, for example, you choose a colour in a lacquer of the RAL palette, then there is no reason for the wood to have intense “fiddleback”. If, again, you wish that your windows and doors are coated with Transparent Lacquer (Decape) where the fiddleback of the wood are visible, then you should choose a type of wood with fiddleback, such as Oak, Ash, Pine, etc.


 
-- If we use wood for constructions, do we by any chance aggravate nature by destroying forests?


-> Wood is abundant in nature. Minimum consumption of energy is required for its production, in contrast to other materials. The timber used for the construction of windows and doors originates exclusively from forests where sustainable management is applied, i.e. management in a way that the forest wealth is not reduced. The two most important forest certification organizations are the F.S.C. (Forest Stewardship Council) and the P.E.F.C. (Program for the Endorsement of Forest Certification).  The felling of forests is done following the instructions of the above organizations and their regulations are very strict. So, it is ensured that the trees are replaced with the same and sometimes higher frequency than that with which they are cut.



--How can we compare windows and doors in order to be able to choose the best?


-> All windows and doors manufacturers in the European Union since 01-02-2010 should, according to law JMD 12397/409/12-8-2009, Government Gazette 1794/Â/28-8-2009 provide marking CE  (Confďrmité Européene = European Compliance). Thanks to this marking which is mandatorily indicated on every window and door, you can compare the special characteristics of windows and doors in relation to thermal insulation, air pressure, waterproofing, mechanical resistance, etc, in order to choose the best. It is important to know which service measured these characteristics that indicate the performance of the windows and doors. SITRA windows and doors provide you with CE marking with measurements by the top technological institute ift Rosenheim of Munich, with which you can be certain for the quality of the windows and doors you are buying. (More on CE and ift Rosenheim )



-- Which areas of the country do you serve?


-> We have a network of retailers and wholesalers throughout Greece. Please contact us through telephone or e-mail and soon one of our representatives will assist you in whichever area of the country you. (Go to “Contact Us”)



-- At which stage should the building site be before I can order the windows and doors?


-> Initially, at the same time with the creation of your house’s designs, you should consult with us in our offices, by e-mail or fax, in relation to the type of windows and doors you wish, the dimensions, the way of operation and opening, the colour etc. At SITRA, we have cadres who in collaboration with your architect, or your engineer, or your decorator, completely free of charge and with great spirit of collaboration, will provide you with solutions that you cannot imagine existing concerning the designing of your windows and doors. In the stage of the designs, all changes and tests are performed in the computer, analogically to the real dimensions, while when we are invited after the masonry to take measures, it is late for changes to be made, for which, if necessary, the walls should be torn down and rebuilt.


We recommend, so that you can save time and money to choose and assign the construction of windows and doors in time, because the process of construction has a specific duration, which cannot be reduced.



-- Are subframes necessary?


-> Yes, it is necessary to place subframes after finishing the masonry. The cost is very low and the profit very significant. In SITRA, we place metal, galvanized subframes, temporarily anchored to the wall. Windows and doors are standardized in relation to their dimensions resulting in the reduction of the price and time of construction, in time reduction of mistakes (loose walls, wrong openings etc), while windows and doors are placed leveled, providing safety (the frames are screwed on the subframes) and with 100% waterproofing for their whole cycle of life. (More on subframes)



-- At which stage should the building site be before windows and doors can be placed?


-> The windows and doors we will deliver to you arrive to your house, with a special cover for protection, like furniture. Their installation should be performed after the building’s plastering is finished and following the completion of the masonry’s coating. In general, we recommend the completion of all the works that can be damaging for the windows and doors, like tablet placement on the floors etc, in order to avoid irreversible damages to your new windows and doors.



-- How long does the construction take?


-> The construction of windows and doors takes from 45 to 60 working days, depending on the quantity of the windows and doors. The counting of the days begins after the designs, the colours, and the direction of the openings are clarified, and under the condition that there are final measurements for the construction.
 


-- My house is very close to the sea. Is it dangerous to install wooden windows and doors?


-> Not only it is not dangerous, but you should do it! Wood is the only material that can cope with such difficult conditions as those of the sea.
Wood is not anodized, it is not polymerized and in general, it is the most reliable material to use in an environment near the sea.
The poor selection and poor application of varnishes in the past, as well as the lack of reliable information in relation to the maintenance of timber made most people believe that “wood needs maintenance”!
In reality, of course, everything needs maintenance, even the human body that is perfect.
Aluminium and PVC as materials, among other things, cannot be maintained and are disposable. Near the sea, this use is very brief and ultimately very expensive because one should replace them with new ones very soon.
In the past, sea varnishes that were used near the sea, often with two components, were extremely hard, ostensibly to resist, resulting in a very hard external layer (crust) that could not follow the contractions-expansions of the wood, are extremely big which near the sea and especially on soft timber (Oak). The crust used to break with the expansion of the wood, so the external humidity (90% by the sea) and the salt were penetrating the wood and made it rot inside. Then, maintenance was difficult, laborious and expensive. The old varnish had to be scraped out until the wood appeared and to be varnished again.

- The polishes we use today in SITRA windows and doors (see details at Windows and Doors Specifications -> Basic Window Model) have been tested against harsh weather conditions and in extreme climates. The varnishes we use are impregnating varnishes and have undergone exhaustive tests in vitro and in practice. Having placed thousands of windows and doors on islands and coastal areas, we can guarantee their resistance even in coastal areas. You do not need to scrape off, rub or use sandpaper at all. Just apply the soft liquids we provide and spread them with a soft cloth, as you would do with your sunscreen!

Regarding fittings and ironworks, as far as the sashes are concerned, ROTO fittings have a 10-year guarantee by ROTO-Germany for sea environments and, as far as the shutters other than ROTO are concerned, there is capacity for installation of fittings made of stainless steel, which are not altered for many decades with no maintenance need.




--  Is it true that wooden windows and doors have undergone a chemical process and that they are harmful for both man and the environment?


-- The varnishes that are used for wooden windows and doors have to be, according to the law of the E.U., water soluble, i.e. their catalyst is water and not organic catalysts. This makes the varnishes and by extension the wooden windows and doors completely harmless and fully ecological.




 

 
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