Before you can install solar panels on a flat roof, you will need to get permission from the Fire Department or the Department of Buildings. To be able to break from the fire code, you must get permission from the Fire Department. You will need to apply to a variance. You can file your application on paper for the moment, but you will be able to file electronically by the end 2019.
Plan before you put it in
You should plan in advance if you want to install solar panels on your flat roof. You need to ensure the panels are installed correctly and allow enough ventilation. They should not interfere with normal roof functions. Using the right racking system will maximize the amount of solar energy you receive from the panels.
Installing solar panels on flat roofs can be done in two ways. You can either mount them directly into the roof, or use a ballasted system that secures them with weights. There are hybrid systems, which combine both.
Wind speed is important
Wind speed is one of the most important things to consider when installing solar panels for a flat roof. Your solar panel installation can be significantly affected by high winds. You should increase the thickness of the racking systems that are used to install solar panel panels if you live in an area subject to high winds.
You must know the direction of the wind to calculate the windspeed. Figure 29.3-1 of ASCE 7-16 gives the prevailing wind speed and direction for buildings with a flat roof. This information will allow you to calculate the weight of solar panels and how much electricity they will produce.
Consider tilted mounting system
If you have a flat roof, you may want to consider a tilted mounting system for your solar panels. Your solar panels will produce more energy if they are tilted correctly. Once installed, the tilt can also be adjusted. Some warranties may not cover solar panels with less than 2 degrees of tilt.
The shade that trees can provide to the solar panels could also be a consideration. This could affect their ability to produce more energy. If there are no trees blocking sunlight, a flat roofing option is better. In addition, a flat roof is more aesthetically pleasing than one with a slanted roof.
Get planning permission
Before you begin installing solar panels on your flat roof, you should first contact the planning office in your area. The office will tell you if you require planning permission, and give you guidance on how to apply for it. Within eight weeks, you should receive your decision. If the planning office finds that your plans will cause a problem for the neighbourhood, they may reject your application. If that happens, you can appeal the decision and contact a reputable solar company to assist you with this process.
Once you have received planning permission to install solar panels on a flat roof, you are allowed to proceed with the installation. You can install solar panels on flat roofs in the same way as for pitched roofs. But you must comply with local planning laws, and get all necessary building permits, before you start work. This will help you avoid causing any problems with the council and your neighbours.