A Roofing Jargon Buster13 May 2015


Though many will be familiar with roof-related terms such as a , eave and ridge, there are others that will be a mystery to the layman.

These include ‘soffit’, which is just underneath a fascia, and box end, which is at the end of a fascia. A roof also has a lip, which is on the edge of the side of a roof. There are also a wide range of roof types, too, as mentioned below.

Pitched Roof Types

Most domestic properties have a pitched roof, though whether it’s warm or cold will be down to where your insulation is situated. A pitched roof will meet at an angle, and be typically in the centre of your home. When insulation is above the rafters of your property, then the building’s timbers are kept warm or close to room temperature, which gives rise to the term warm insulation. This type of insulation can also involve the area between the rafters being insulated as well, and, most commonly, most domestic properties with warm insulation will have insulation on top of and between the rafters. The rafters are not insulated for a cold pitched roof, and insulation will be underneath the rafters or between them.

Flat Roof Types

A flat roof is the term for a roof that isn’t pitched. The pitch on this type of roof will be under 10 degrees, and can be completely flat. They also consist of either the warm or cold construction method. Among the flat roof types is the warm flat roof, the cold flat roof, the hybrid warm flat roof and the tapered roof. The insulation will be above the joists/roof deck for a warm flat roof, but below the joists for a cold flat roof. Normally, a minimum two thirds of all insulation will be above the joists/roof deck concerning a hybrid warm flat roof. Though what a building is used for, where it’s situated, and its humidity class can mean that levels of insulation will be affected.

Inverted Roof

Another example of a warm flat roof, an inverted roof, is waterproofed, but the insulation is above the waterproofing, as opposed to a warm deck flat roof. Consequently, together with rain water passing through insulation layer gaps, it will also drain from the surface of the roof.

Green Roof

As the name would indicate, a green roof has plants or grass growing on the area of the roof that has been waterproofed. A green roof can be a simple affair, or be a roof garden that consists of a wide range of plants and shrubs.

Curved Roof

The most noticeable design feature of a curved roof is an arc, which assists drainage. As a consequence of this arc feature, the insulation for a curved roof has to have flexible.


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