Roofing is one of the most important aspects of home and building construction as most structures would need something to serve as shelter. It is roofing companies toronto not surprising how roofing has developed over the course of history and even so just over the past two decades. As more homes are being built, more options of roofing have sprouted as well. This fills the several requirements, not only of function, but also of aesthetics. It is amazing to observe how many choices a homeowner can make when it comes to roofing.
The Built-up Roof
If there is one roofing option that is considered a classic, it would most definitely be the built-up roof system. Developed for over a century ago, this type of roof has a time-tested reputation that makes it almost an automatic choice for a lot of home builders. Of course, this is not a perfect roofing option as it can pose some considerable limitations, but a lot of those who chose this type have seen it work quite well.
The built-up roof is generally preferred in places of high traffic and when there is a possibility for the roof to be subjected to mechanical abuse. The built-up roof’s membrane is generally thicker and stronger compared to most other roofing options with its multiple layers and gravel surfacing. Since this is a popular choice, it is usually easy to find a contractor who can handle both installation and repair of this roof type in most locations.
The main disadvantage with built-up roofs is inflexibility. The roof may be subject to damage due to structural or thermal movement. A long building would need additional roofing support to prevent the roof from damage due to contraction. The compression due to cold temperatures or stretching due to hot temperatures may also take a toll on built-up roofs. Much care is needed if these factors are pronounced in a particular area.
Modified-Bitumen Roofing Systems
Modified-bitumen roofs have similar advantages and disadvantages as built-up roofs. However, one great advantage of this roofing option is that it performs significantly better during cold weather. This type of roofing has been developed to become flexible when the temperature is low. They can adapt to temperature changes better than the built-up roof.
There are two type of modified-bitumen roofs – the plastic-based ones (APP) and the rubber-based ones (SEBS and SBS). The plastic-based membranes are usually installed using torches while the rubber-based membranes are installed using cold adhesives or hot asphalt. Most modified-bitumen roofs already have granulated surfaces so they are lighter than built-up roofs that have gravel surfaces. Modified-bitumen roofs may also be added as cap sheets on top of existing built-up roofs. This adds redundancy to the roofing as well as some flexibility