Contractors - Materials

The installation of wooden frames

In most industrially advanced countries the wooden frame comes and is finished on the construction site. In our country, a different practice is generally applied. The frame and the sheet are manufactured and placed in different phases of the worksite and even not completely finished. Thus, the fitting of the frame is made after the walls are built and serves as a guide for the coatings. Later, the leaves are made and placed (usually after the final flooring, whereupon the final height of the portfolios is shaped).

The fitting of the frame is made on the sides of the opening with metal plates that are mounted with cement mortars in holes that are opened on the spot. The door frames (which are not closed shapes) are hinged, in their lower edges, to the floor. Between the frame and the opening a joint of about 1 cm is allowed. The joint facilitates the placement, but also the fixing of the frame with the penetration of the coating.

In the outer frames it is good to fill the interior of the joint between wall and case with fiberglass or polyurethane foam to ensure better wind resistance and thermal insulation.

The main problems of this type of installation, which are applied in our country, are: - Excessive strain on the frame due to bumps as well as absorption of moisture from the coatings. - Bad application of sheet and case (mainly on windows where the fitting slots are more complex) because the case and the sheet are manufactured separately and in different time phases. - Additional work on leaf-frame adaptation when done on site instead of factory.

In case of frames made of good quality wood that will not be stained, we use pseudo-aces. Pseudokasas (simple cross-section of cheap wood) serve as a guide to the coatings and is either removed or left and used to screw on it or a real frame when the building works are at a very advanced stage. After fitting the frame or pendulum, sheaths are used to cover the joint formed in the wooden frames between the frame and the coating. The problems of strain on the wooden frame (both in the construction phase and in the later construction of the building) are avoided to a large extent by the use of metal straighteners.

In case of frames made of good quality wood that will not be stained, we use pseudo-aces. Pseudokasas (simple cross-section of cheap wood) serve as a guide to the coatings and is either removed or left and used to screw on it or a real frame when the building works are at a very advanced stage. After fitting the frame or pendulum, sheaths are used to cover the joint formed in the wooden frames between the frame and the coating. The problems of strain on the wooden frame (both in the construction phase and in the later construction of the building) are avoided to a large extent by the use of metal straighteners.

Maintenance and protection of wooden frames

In order to function properly and have a long life, the wooden shutters must be properly protected and serviced. Wood as an organic material can assist in the growth of other microorganisms within its mass if conditions are appropriate for their development and if appropriate protective measures are not taken. In this case, we notice damage to the wood, more characteristic of which is insect attack and fungus swelling. Moisture greatly aids the growth of fungi over the operating problems it creates in the same lumen (swelling or distortion of the cross sections). Softwoods, mainly those used in the construction of window frames, are more easily affected by moisture and insects.

In order to improve their strength, we undergo various treatments, either applied preventively or posteriorly to the frame
impregnation of wooden sections with various chemical preservatives
surface treatment with paints or varnishes.

For exposed frames, maintenance should be done every 5 years for oil paints and every 1.5-3 years for varnishes.

G. Conclusions.

Wooden frames have many advantages, they can operate efficiently and have a satisfactory shelf life if their careful use, proper protection means and frequent maintenance are ensured.

The lesions observed in wooden frames are mainly due to:

  • Machining errors of wooden joints
  • Poor glue quality
  • Small wood sections
  • Use of inappropriate wood quality, high wood moisture content (over 15%) in the construction and installation phase
  • Poor color quality and coloring job
  • Lack of timely maintenance.