High strength and reliability of the design;

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Installation of extensions on interior doors begins after you make sure that all parts fit tightly to each other and to the opening. The upper part of the extension board is fixed with improvised means between the door frame and the wall of the opening. The best option is masking tape, which is characterized by a high level of tensile strength in the perpendicular direction and easily withstands the forces of foam when swelling. 3-4 strips on the side extension strips and 2-3 on the top board are enough. Another good option for fixing the extension is wedging with wooden pegs made by hand.

Then vertical strips are installed so that the upper strip lies on azerbaijan mobile database level without gaps or cracks. The side parts are also fixed with wedges or masking tape. Then the resulting space between the extension and the walls of the opening is filled with polyurethane foam under low pressure. First, the edges are filled pointwise along the width of the opening, and after drying, the remaining void is filled.

Please note that the installation of extensions and trims is performed after the foam on the door units has dried. Before the final stage of installation, interior doors should stand for about a day to dry the mounting foam.

The telescopic extension strip is installed using the same principle of action (adjustment to the length of the upper and side strips), the difference is the technology of gradually building up the structure. It is strongly not recommended to pre-assemble the entire structure and then install it in the opening, since when filling the empty space with foam, the likelihood of breaking the connections and distorting the extension increases. First, the first extension strip is mounted along the entire perimeter, after it is fixed, the next one is installed, etc.

Adviсe
Before foaming, it is recommended to clean the wall surface and the inside of the extension board from dust/dirt if any, and then slightly moisten. A damp, clean surface increases the adhesion of the mounting foam and the subsequent reliability of the foamed structure.

Advantages of installing extensions on interior doors using polyurethane foam: