Moisture Control in Low-Slope and Flat Roofing Systems

Condensation within a flat roofing system mainly occurs during cold weather seasons when moisture and vapor in the air caused by heat from within the building rising out into the cold roof void above the ceiling. When the temperature of the moisture falls to or below its dew point, the water vapor condenses on the cold surfaces around it causing damage and leaks. Condensation is a particular problem in flat or low-sloped roofing systems above rooms that generate a lot of heat such as kitchens and bathrooms. A flat roof should be designed to minimize condensation and a proper analysis of the positioning of insulation materials, vapor control layers, ventilation, and thermal insulation should be reviewed prior to installation. Here are our tips on preventing the likelihood of leaks on low-slope/flat roofing systems:

During Design/Specification:

1. Provide a positive roof slope. This will provide roof drainage and better ventilation to the outdoors.

2. Provide as much ventilation for moisture "traps" as possible. This can be achieved by cutting back ends of reflective foil/batt insulation which are installed below the roof sheathing.

3. Use insulation above the wood deck. Where low design temperatures or high interior humidity are expected, this method can help keep wood temperatures above dew point.

During Construction:

1. Install roofing over the wood deck ASAP. This will protect the insulation from exposure to the elements.

2. Provide proper ventilation to remove moisture. Moisture build up during the construction of a roofing system is expected due to the curing of concrete and gypsum jointing materials. Proper ventilation will prevent these aspects of installation from having long-term effects on the roof.

During Service Life/Homeowner Tips:

1. Don't let moisture stand a chance. If you own a home with a low-slope or flat roofing system, it's going to require a little more care than a standard shingle roof. Your best bet at maintaining the integrity of your roof and preventing leaks is calling a pro for any snow/heavy rainfall removal - this way you know the job is being done correctly. If you've had any extreme weather (snow. rain, or wind) be sure to notify your professional, this way, they can ensure all roof membrane and HVAC systems are in working condition.

5 Tips to Stay on Schedule During a Roofing Project

Installing a roof on a building is a big job with many various and sometimes changing components. Effective coordination and communication between the crew needs to happen, but unfortunately schedules can get derailed in the process. 

Here are some ways you can be better prepared for the unexpected and ensure your company’s project runs on time:

1. Plan around the weather. Use a satellite weather monitoring system to get the forecast in real-time. This will eliminate scheduling conflicts and help to avoid costly delays.
   
2. Make sure your materials are on site. Some products are easily purchased, but others may need to be specially ordered in advance. If the latter is the case, you will need extra time to ensure everything has been delivered in time to begin your project.
   
3. Designate a foreman/manager/site supervisor. This person will direct and supervise the roofing process, plan the work to be done for the days ahead, make sure the installation is done to standard, and secure materials, equipment, manpower, and subcontractors (if needed) to keep the project moving smoothly. Preferably, this person will not be installing, but rather spends his/her time supervising and coordinating.
   
4. Use scheduling software. Every project should have a plan and schedule set in place before ground breaking day. It should be allotted into manageable phases with completion targets clearly determined. The schedule should be updated daily and distributed to all parties involved in the project. Making your trades and employees aware of the timelines will make meeting deadlines a breeze.
   
5. Get a dedicated delivery vehicle. To prevent unforeseen shortages, breakdowns, or to replace broken tools, have a vehicle and dedicated "runner" available to handle these problems as they arise. You want the foreman and contractors to be on the roof working and coordinating, not dealing with equipment or material errors.

All of these steps will help ensure that your roof is completed on schedule. And remember: preventing problems takes planning!