Flat roofs are becoming a popular option in modern home design, as they create a sophisticated look and lend themselves well to cutting-edge and contemporary designs. But they are not only beautiful, but also practical, as they help to make the most of the interior space and require less materials to cover the same surface. If we add to this that, for those looking for sustainable solutions for the home, they also easily combine with living green roofs, it is easy to understand why they are experiencing such an important moment.
If you are building a new house and are thinking of incorporating a flat roof, there are many reasons to do so, but if construction and design are not exactly your forte, you may quickly become confused about the hows and whys.
To demystify the subject, we have broken down everything you need to know about flat roofs to make decision-making easier.
Advantages
Flat roofs offer a whole series of advantages. First, they allow you to maximize interior space by freeing up the area that would otherwise be unused under a traditional gabled roof, such as the sloping space in your attic or loft.
They are also incredibly flexible, adapting to the most unusual designs with ease and, in fact, are cheaper to install than traditional gabled roofs. In addition, they tend to do a superior job when it comes to maintaining a stable temperature inside, which is great news if you are looking to live a more sustainable and energy-efficient lifestyle.
The perfect inclination
Although described as "flat", this type of roof must incorporate a slope in its design to allow rainwater runoff and prevent it from accumulating on top. Ideally, the fall should be at least 1:80, with 1:40 being optimal. This can be achieved in several ways, for example by using "fir battens" (battens cut at an angle that are placed on top of the beams), placing the transverse walls at slightly different heights or using conical insulation.
Horizontal roof windows
Another great advantage of choosing a flat roof is the fact that by installing horizontal roof windows such as skylights or lantern windows, you can let in more natural light and create a brighter and more airy space. This is ideal for rooms that do not usually receive much natural light throughout the day, and also facilitates ventilation if you opt for an operable skylight.
Fixed skylights, on the other hand, do not open, but work well in areas such as stairwells, where the need for ventilation is less, and offer a particularly safe solution, while, thanks to their very narrow frames, they integrate perfectly.
The pyramidal skylight -or roof lantern, as it is also known- has, as expected, a pointed shape and is used to let light flood into a room or space. Available in a wide variety of contemporary designs and many shapes and sizes, you can also choose from many different types of glazing, making them one of the best options if you are looking for a more customizable option.
How to build a flat roof
The construction of any type of roof is often best left to the professionals, but if you have some knowledge in the area, then it is possible to do it yourself.
A hot roof is generally the easiest type of flat roof, and is created by placing the roof insulation directly on top of the timber frame, then placing the membrane on top. This is one of the most energy-efficient solutions and for keeping the house warm, but if you want a lower roof profile, a cold roof is an optional alternative that is constructed using the standard method employed in flat roof extensions.
A risk analysis to determine at what temperature water vapor will condense within the roof structure and how it can be removed is key during any roof construction project. Air and water leaks are also, for obvious reasons, major drawbacks that you will want to avoid, and considering the potential problems that can arise from not getting the envelope right, if you have any doubts, be sure to enlist the help of a professional.
