If one’s planning to buy a house or already owns one, it is important to ensure that the foundation of the property is strong enough to withstand the test of time. A weak foundation can lead to serious consequences and cost a dime in the near future. To avoid any unforeseen mishaps and safeguard the property, it is essential to recognize the signs of a bad foundation and take prompt corrective measures. Wall cracks Hairline cracks on exterior walls are a common occurrence. However, if cracks begin to appear to run deep or in a zigzag pattern or cause the foundation to protrude outwards, it could be indicative of foundation issues. In case the crack is horizontal, zigzag, lets water in, and/or is wider than a quarter of an inch, it is advisable to have it inspected by a professional. In some cases, the wall may also begin to bow outwards. To check this, simply use a straight edge along the outside walls to assess the degree. Although minor bowing is common due to settlement, it is always best to have the issue checked by a foundation specialist to determine the main cause. Similarly, cracked walls are common inside the house, too – especially those made from drywall.