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Private residential building from 10.09.2022, Kiev region, Vasylkiv.

Solving problems with cracks in walls: how static restored the integrity of a private house

 

A private residential house on a plot of land up to 10 acres, designed in 2010-2012. Detailed characteristics:

Two-story house measuring 9m x 9m (2nd floor designed as a residential attic);

Monolithic strip foundation (400mm x 1600mm), h = -1200mm from the ground surface;

Three-layered external walls, with a total thickness of 390mm: aerated concrete (200mm), inter-wall space filled with polyurethane foam (70mm), and outer-facing brick (120mm);

Reinforced monolithic belt located between the first and second floor, measuring 200mm x 200mm;

The ceiling between the first and second floors is made of prefabricated hollow reinforced concrete slabs.

Double-pitched roof with a wooden truss system. The roof is covered with metal tiles. 

Problem and reason for conversion:

1. After purchasing and completing the construction of the house in 2020-2021, a heating system was installed and all communications were carried out. In order to improve the thermal insulation of the house, the owner decided to fill the inter-wall space with a 70mm thick special insulation made of polyurethane foam, after which the house began to be heated by the heating system. After some time, cracks appeared on load-bearing walls and partitions in the middle of the house, the number and width of which constantly increased, as well as their openings (photos are available below in the materials).

2. The homeowner planned to carry out finishing works inside the building, but first needed to address the issue of the cracks in the walls. It was clear that masking the existing cracks was not rational, as it would lead to more serious problems and financial costs.

Solution algorithm and further actions:

• The homeowner used Google search to find the company LLC "Static Systems" and the Stati-CAL technology. A preliminary consultation was conducted over the phone, and photos/videos of the problem areas of the house were sent via messaging apps (Viber/Telegram). As a result, the company's specialists decided to send an engineer and a technologist directly to the site to conduct an audit and a detailed inspection of the house (photos are included below in the materials). Based on the results of the inspection and examination, the engineer developed a preliminary project for repairing cracks in load-bearing walls and strengthening the walls using pre-stressed Stati-BAR/Stati-TIE reinforcement technology Stati-CAL, upon which the scope and cost of the work were determined (the project is included below in the materials). The project and commercial proposal were approved by the homeowner;

• The project took 8 calendar days to complete. A total of 90 m/p of horizontal pre-stressed Stati-BAR reinforcement and 70 m/p of Stati-TIE chemical anchors made of pre-stressed reinforcement were installed. In the middle of the house, installation grooves measuring 12/14mm x 60 mm were cut and prepared, with a total length of 100 m/p (photos are included below in the materials). All house communications and structures were preserved during the work to ensure normal operation of the house and compliance with the 10-year warranty obligations (for the absence of crack development and deformation). Thirty days after completion, LLC "Static Systems" specialists performed geodetic work to fix the position of the house horizontally, and the report was sent to the homeowner (included below in the materials).

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