Britannica reports that Oregon has a rainy season from October through April, with average precipitation of 35 to 40 inches. This is quite high, which means that buildings must withstand such moisture to keep both people and items safe inside.
It's common for commercial properties to have flat roofs, and they need special preparation for the year-round rain. Here are the proper steps to take.
Schedule a Detailed Roof Inspection Before the Wet Season
Oregon commercial property owners should treat roof inspections as a year-round planning tool, and not just a response to leaks. It's important to inspect the following things before the wetter months arrive:
- Membrane
- Seams
- Flashing
- Penetrations
- Drains
- Scuppers
- Area around the rooftop equipment
You should also check the inside ceilings and insulation for signs of moisture, as that may be a sign of leaks. For Oregon flat-roof properties exposed to frequent rain, modified built-up roofing offers a layered membrane option designed for long-term moisture protection.
Choose a Membrane That Can Handle Oregon's Moisture and Temperature Swings
When selecting a flat-roof membrane, look beyond the initial installation cost. There are prolonged wet conditions in Oregon, as well as seasonal temperature changes, so both the membrane and its seals need to accommodate:
- Moisture exposure
- Expansion
- Contraction
- Repeated weather cycles
One of the most important things to consider is matching the roofing system to the roof's slope, drainage characteristics, rooftop equipment, expected traffic, and maintenance requirements. You should also evaluate:
- Manufacturer specifications
- Installation standards
- Warranties
- Condition of the existing roof assembly
Looking at the above things can help you determine whether you need to repair, restore, overlay, or replace the membrane.
Give Drainage Capacity as Much Attention as the Membrane
Commercial flat roofs need positive drainage so that rainwater moves toward drains, scuppers, gutters, or other approved discharge points. And factors like Portland's stormwater requirements can also make the location and configuration of roof drains important when drainage systems are modified.
You should have drains and overflow paths checked regularly for leaves, debris, moss, and other obstructions. During the reroofing process, check whether inadequate slope or deteriorated drainage components need to be corrected. Don't just install a new membrane over an underlying problem.
Account for Temperature Changes When Planning Roof Equipment and Details
There's more than rain when it comes to Oregon's weather and climate; for example, seasonal changes can cause roofing materials and building components to expand and contract, and this can place stress on things like seams and flashing. There are also rooftop HVAC units that can create additional areas that need attention.
During inspections, you should look beyond the membrane itself and examine how the following interact with the roof:
- Equipment
- Walkways
- Flashing
- Adjacent construction
There should also be access to roof drains and equipment requiring maintenance.
Build Preventive Maintenance Into the Property's Annual Schedule
Preventive maintenance should be a part of your regular business operations because recurring moisture exposure can make small defects grow big quickly. Your maintenance program should include careful lookovers of the areas mentioned earlier, regarding roof inspections.
Make sure to clean drainage components before periods of heavy rainfall, too, as this can help keep water moving through the system. If there are small defects, you should repair them promptly to reduce more water intrusion.
Lastly, you should maintain written inspection reports, as well as photos, repair records, warranty information, and projected replacement timelines.
Keep Commercial Properties Safe and Dry
If your commercial property has a flat roof, then follow our rainy season preparation tips. By being proactive, you can ensure that your investment remains protected and that everything and everyone inside are safe.
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