Here's What A Bellcast Roof Is (And What It's Good At Preventing)

If you take even a passing interest in architecture, then you may find yourself looking at certain architectural features and wondering what their purpose is. While some elements are merely for decoration, many building features are designed to solve a specific practical issue. This is true for bellcast roofs, for instance. 

A bellcast roof is one that features a gently curved angle towards the bottom edge, named for how its shape resembles that of a bell. The purpose of that lower curve is to slow down the momentum of precipitation such as rain and snow because, if it gains too much speed as it travels down the roof, it can shoot off over the gutter rather than landing inside it. This should be avoided since water that doesn't stop in the gutters can end up running down the side of the building or hitting the ground outside it and soaking in, potentially causing obvious or hidden water damage. The bellcast roof is common in colder areas that get a lot of snow every year since it ensures that the snow either melts into the gutter or lands far enough away from the house to prevent damage. This roofing style can keep precipitation from damaging a home, but before you decide it's right for your own home, there are some considerations to take into account.

This roof style can be helpful for preserving the look and structural integrity of the building below it. However, how it's installed is crucial in making sure it works properly. For example, the point between the main roof's slope and the change in angle must be gradual, otherwise a kink or abrupt change in the roof's slope can create a dipped section where water might pool. Sitting water is an issue because it can cause the roofing materials to break down more quickly. Pooled water can also collect other debris such as leaves and twigs, which then stay on the roof even after the water has evaporated, adding strain to the structure.

To combat this problem, some roofing companies use lead detailing underneath the tiles or shingles at the point of the curve. This added layer makes the bellcast more effective by ensuring a clean, steady change in angle and encouraging precipitation to land in the gutter rather than running down the side of the building. In addition, lead linings stand up well to corrosion and the intense UV rays that beat down on roofs. Therefore, by using a lead lining underneath the bellcast's curve, roofers can improve its lifespan by helping it to withstand all different types of weather. If you're wondering about different types of roofs to consider or whether to keep an existing bellcast on your home, it can be helpful to speak to a roofing expert to work out whether a bellcast is right for you and what can be done to ensure it stays in good condition for years to come.