Now more than ever, building managers and condo boards have been reviewing the cost of deferred repairs and their fiduciary responsibilities when it comes to facility safety and maintenance. But where to look first? There are many types of condos: from high-rises to townhouses, to one-story duplexes, buildings with flat roofs or high-sloop roofs, buildings with facades of brick or masonry, to vinyl clapboard siding, to wood shingles, to glass curtain walled city towers. Yet the answer is the same with all of them… look for the water.
When it comes to condominium facility maintenance issues, it has been our experience that 85% of building problems can be traced back to unauthorized water in one of it forms. To illustrate this point we will review common building components and how they fail due to water.
Take It from the Top
Starting from the top, the roof is an obvious culprit in allowing water to penetrate the building envelope causing not just damage to interior finishes and personal belongings but also serious structural problems and indoor air health issues. For this reason, all roof surfaces should be inspected at least once a year or after any wind event of 50 miles per hour. Flat or low-slope roof structures are surfaced typically with EPDM rubber membrane or vinyl sheet material. These materials, with useful lives of 25 years and more, rarely fail. Rather it is their junctures such as adhered seams and connections to other materials such as flashing where water infiltration starts that is the issue. Keeping internal and external drains and scuppers free of debris are also key inspection points. High-slope roofs surfaces with asphalt shingles are similar in that the inspection focus should be on flashing and proper gutters and downspouts.
Down Below
Below the roof, almost all facades allow some penetration of moisture. The issue is how to control this water infiltration. Normally this is done with drainage planes behind the façade material. Masonry and concrete facades as well as vinyl and stucco siding allow the penetrating water to escape via weep holes strategically placed to vent steam and moisture. Often the biggest mistake made in building maintenance is an attempt to seal the façade surface, which results in blocking the façade’s designed drainage system and trapping moisture inside the façade material. Thus, preventing natural drying.
Facade thermal expansion and window penetrations require the use of caulk and other joint sealing compounds. Any material depending on adhesive properties will fail with time, allowing water infiltration. These materials need to be monitored and replaced as needed. Windows rarely fail. It is the perimeter caulking and flashing that serves the role of moisture infiltration.
Condominium concrete parking garages have a different set of requirements. These concrete deck surfaces require good drainage and, in some cases, a good waterproofing seal coating applied periodically. This will protect the steel reinforcement within the concrete slabs from road salts commonly used in New England.
The Foundation
Below the facade is the foundation. Flooded basements and damp walls concealing mold and other problems are well known water issues. A great deal of association money is spent on internal wall waterproofing materials and repairing foundation cracks with a variety of sealants. All water reaching the foundation wall comes from the ground surface in the form of rain, snow melt, or surface drainage toward the foundation. Sometimes regrading so that the ground surface near the foundation slopes away from the building is all it takes. Sometimes sealing the perimeter ground surface is the answer before the more expensive underground foundation drain solution is attempted.
Just Say Water…
Let’s not forget the parking lot and driveway surfaces. Here again, water is the first suspect for surface cracking and reoccurring potholes. Storm water penetrates the surface cracks and undermines the soils, washing them out or causing them to expand through freeze/ thaw cycles creating upward pressure, expanding the cracks even more. Seal coating is just a form of painting the surface for eye appeal and seals very little. Pavement problems need to be resolved by more invasive means with the help of an engineer or competent contractor. You can read more about paving maintenace HERE.
The good news is, the source of your maintenance problems is not hard to find, just say water.
Article written by Jack Carr, P.E., R.S., LEED-AP, Criterium Engineers. (Edited for this blog by MH)