Choose the right tiles for your roof
In the UK, we often see low pitch roofs on single storey extensions and garages. A low pitch roof is a roof that is very nearly flat, with only a slight angle. If you want to tile the roof, we recommend that its pitch is more than 10 degrees, but between 10 and 20 degrees, you have more options.
Often, people move into houses and are stuck with the roof that they end up with. Badly designed extensions may have a roof that is not ideal; sometimes, the roof is shallow due to space constraints and the arrangement of windows on the first floor. In all cases, we can work with you to find a solution.
How Tiles Work
To understand how the pitch of a roof affects the issues, we need to understand how tiles work.
A roof tile is shaped to funnel water down the roof and into the gutter. The pitch of the roof aids gravity in helping the water to run away quickly, ensuring the roof does not get waterlogged. Normally, roof tiles are designed to be pitched at 20 degrees or more. A roof on the vast majority of domestic properties will exceed this.
If the pitch of the roof is very shallow, the water can pool in certain areas, which means the tiles will not be watertight. If the rain is particularly heavy, water may be pushed into the gaps between the tiles – the opposite of what is supposed to happen.
Tiles For a Shallow Roof
If your roof has a pitch between 10 and 17 degrees, we can use special metal or concrete tiles that are shaped to prevent water ingress. These tiles usually have very tight interlocks and a smooth surface to aid gravity as much as possible. Between 10 and 15 degrees, you’ll have decidedly fewer options, so you may be limited to just one product.
Once we’ve identified a tile that will work, we’ll still need to inspect your roof to make sure it meets the manufacturer’s requirements. Specifically, it needs to be free of valleys that will create weak spots when the roof is finished. You will also need a full gutter inspection, and parts of your guttering may need to be replaced to ensure that the water is flowing quickly away from the tiles.
Finally, remember that tiling a shallow roof is going to be less successful in exposed or north-facing areas. The heavier the rainfall, the more likely it is that we will recommend an alternative solution, such as a bitumen roof.
Hire a Professional
To achieve a good result on a shallow roof, you need an experienced professional to carry out the work. Building up the pitch with felt, using glue, adding extra tiles or running gutters in the wrong places will eventually cause your roof to rot and leak. That’s why it’s critical to invest in the right products rather than trying to reverse engineer a solution.
South Thames Roofing would be pleased to visit your property and quote for a shallow tiled roof. For an inspection without obligation, give us a call today.