(Bob Ruby, Home Inspection Solutions Missoula Montana, 406-646-6182)
Every homeowner should occasionally check the exterior of their home’s foundation, especially if there have been severe weather or geological events, such as heavy rains, flooding, or seismic activity, or nearby construction or industrial work that creates noticeable vibration, such as roadwork, the installation of oil or gas wells or pipeline, etc.
Regardless of the type of cladding covering the exterior of homes, most homes’ foundations are built using a reinforcing metal structure covered by some kind of concrete or masonry. There are many green homes and alternative building methods that use wood and other materials, but masonry foundations are the most popular. If your home has a masonry foundation (including masonry walls), here are some things to know, especially if you notice the development of any defects, cracks, or moisture intrusion in your crawlspace or basement.
Before looking at the exterior, it’s useful to know which walls are load-bearing and which are not. Usually, this can be done by examining the beams and joists in the basement, crawlspace or attic. Also, note whether the walls are solid masonry or masonry-cavity, non-structural brick, or stone veneer. The overall quality of the building’s construction, and often that of its neighborhood, will be a good indicator of the condition of your home’s masonry.
All exposed masonry should be inspected for the following:
Although masonry can deform elastically over long periods of time to accommodate small amounts of movement during freeze-thaw cycles, large movements can cause masonry cracking, which may appear along the mortar joints or through the masonry units.
Cracking can result from a variety of problems:
Most common masonry wall cracks are caused by thermal or moisture expansion. Active cracks can be sealed with a flexible sealant. Inactive cracks may be pointed, which is the process of filling joints between masonry units or bricks with mortar. Some of this work should be undertaken by a masonry professional.
If there are evident or suspected problems, two methods of testing are sometimes useful for assessing masonry. This first test should be performed by a qualified masonry contractor. Probe holes can be drilled through the joints or masonry units with a masonry bit and probed with a stiff wire (or a fiber optic camera) to determine a wall’s thickness and the adequacy of its mortar. The probe holes are then patched after the investigation has been completed.
A hammer test can be used to determine the structural soundness of masonry units and their bond to the mortar. In a hammer test, the masonry is tapped lightly with a hammer, and the resonance of the sound produced is evaluated. Individual bricks can be replaced and the mortar re-pointed, as damaged bricks cannot be repaired. If re-pointing, the new mortar should be of the same composition as the existing mortar to prevent deterioration.
There may be a substantial difference in the masonry walls in buildings built during the last 40 to 50 years compared to those constructed earlier. Walls became thinner as designers began to more effectively exploit the compressive strength of masonry. This was done by using higher-strength masonry materials and mortars. But this change came at the expense of flexibility; as such, today’s masonry walls and foundations are often more brittle than their massive ancestors and, therefore, particularly susceptible to stress-induced damage. That’s why homeowners should be vigilant with their homeowner maintenance plan by occasionally checking the condition of their home’s foundation, along with any masonry walls.
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Bob Ruby - Home Inspection Solutions Missoula MT. 406-646-6182 , email@example.com
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