Why does the window top extend to both ends 250?

Because according to the national standard, the window coping needs the extension of steel bars to alleviate the stress generated by some windows and achieve a safer and more stable structure.

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Requirements for window sill capping construction:

1. According to Article 6.5.3 of Code for Design of Masonry Structures (GB50003-20 1 1), the following measures can be taken to prevent or alleviate cracks in the bottom wall of houses:

A, increase the stiffness of foundation ring beam.

B, set three welded steel mesh or 2 φ 6 steel bars at the bottom of mortar joint of windowsill wall, and extend into the walls on both sides of the window not less than 600 mm ..

Window sill coping function:

1, as a quality common fault prevention, reduce or avoid wall cracks caused by prestressed concentration.

(There are splayed cracks at the junction of wall and window sill on both sides).

2. It can prevent external rain from entering and affect the strength of the lower wall.

3. When installing the window, the flat iron can be fixed on it to increase the stability of the window.

4. Increase the integrity and stability of the lower wall of the window sill.