Roof Construction

by admin on October 17, 2012

Roof construction detail showing how and from what materials a pitched roof is constructed from.

The roof structure is the last tasks required in order to water seal a building.

When they are designed they have to include set parameters.

They must provide a roof pitch which allows water to be shed easily they must be wind resistant and should also provide adequate levels of insulation to prevent heat loss.

Roofs are assembled from light weight materials such as timber, ceramic and composites.

Where the rest of the building’s walls and floors are usually made from heavier stronger and more durable roofs have to be replaced and updated to keep them in good working order.

The most popular style is the timber pitched roof with an insulated ceiling.

The structure is made up from standard sized components, rafters, ceiling joists, purlins, counter battens and tile battens.

Plenty of insulation is added in between the ceiling rafters and the structural elements spanning the length of the roof pitch.

Another feature in a roof design is the eave. The eave acts as a ventilator it as a series of vents integrated within it which allow for the passage of air into the roof space this prevents the build up of moisture and condensation making the roof structure remain dry healthy and insect proof.

roof construction detail

roof section detail


Pitched Roof vs. Flat Roof

The roof is undoubtedly of the more important features of a home, not only for weatherproofing, but it also provides character for your home.

If you just contemplate the contrasting impression that a low-slung tile, classical pile or thatch roof can make on a home, then you’ll understand it’s overall importance in a home’s design.

Looking at the wide range of configurations and finishes for home roofing is something that you will want to decide on ahead of time.

A large majority of home in UK have pitched roofs, which are perfect for deflecting any rain by letting the rainwater move down a slope towards the bottom, away from the home.

Even in the flat roofs that happen with Georgian and Regency terraces are not fully straight, containing a complex mixture of small-pitched roofs that work amongst gutters and drainage channels.

There are only a few flat lead roofs left, which occur in stately homes, public buildings and cathedrals.

While these roofs used to have to defy the odds, this is no longer the case, as there has been major development with waterproofing membranes, and there is no longer a need to worry about leaks or dry rot.

What are the benefits of pitched roofs? They can provide useful loft space or living accommodations, act as an architectural design that provides a ‘hat’ for the house, and also allow for easy spotting of any slipped tiles or issues that may lead to leakage.

What are the negatives of pitched roofs? They tend to be complicated in terms of construction; they need to have wide plans and more materials to cover a home and the access to the slopes in a pitched roof. This can require safety measures like a harness or scaffolding, which can be costly and dangerous. There is a secret to designing an excellent pitched rood, and this is done by exploiting the volume that will allow for the accommodation of living or storage space.

Let’s compare this to the positives and negatives of a flat roof.

What are the pros of having a flat roof for your building? These flat roofs can provide you with an economical way to cover a building with a complex floor plan, they allow for roof lights to be easily installed which brings in natural light to the building. It even allows for access and maintenance on the roof to be both easy and safe. What are the negative aspects? It can be very difficult to locate and leaks for repairs and flat roofs have a bad reputation when it comes to being watertight and durable.

When you are going through a building project, the choice between pitched or flat may not be an option. They key is to look at the advantages of each type of roof and exploit these aspects in the course of the project. In the main part of a building, you can always employ a pitched roof, and use extended ground area for any roof terraces, which enhances the quality of a first floor accommodation.

What types of materials will be used for roofing? In the case of a pitched roof, timber is the most commonly used material that will allow you to support the slope of the roof and the bridging in the support system. While materials come into play when factoring in cost, it is easy to see that the simplest roofs are the ones that are going to be the most cost effective. The minute you start adding details like different room levels and dormer windows, then you’re upping the price and the complication of the plans. In order to keep effectiveness high and cost low, using a combination of pitched and flat roofing will work best.