Various flat roofing systems are available, from single-ply membranes to traditional felt roofing and eco-friendly green roofs, each with its own benefits and considerations.
Flat roofs, with their nearly level surface and slight slope for drainage, are typically seen on commercial and industrial buildings. Due to their inexpensive construction and easy installation, they’re becoming increasingly common across residential properties in the UK. But what are the best systems for your flat roof?
Flat roofs have grown in popularity in the UK for various reasons. Their modern aesthetic appeal fits well with contemporary architectural styles. Flat roofs offer more usable outdoor space, such as rooftop gardens or terraces, which can be especially valuable in urban areas with limited space.
Flat roofs can be more cost-effective than pitched roofs, requiring fewer materials and less labour. They also provide easier access for maintenance and installation of solar panels or other eco-friendly features.
Flat roofs are common in the UK, with 7 in 10 UK properties having a partial flat roof, particularly in urban areas and on properties with modern architectural designs. While pitched roofs are still prevalent in traditional housing styles, flat roofs have gained popularity in multi-story and commercial buildings, apartment complexes, and contemporary residential properties.
Flat roofs can be traced back to some of the earliest civilisations, usually in warmer climates. Widespread use in Europe started in the 19th century when waterproofing became more practical. Flat roofs became more common during the 20th century, especially in commercial and industrial buildings.
The mid-20th century saw a surge in their use in residential construction, thanks to the modernist architectural movement. Over time, there have been improvements in materials, construction techniques, and regulations to address issues like drainage and insulation, keeping flat roofs relevant in contemporary UK architecture.
The cost to replace a flat roof varies depending on size and use, but new residential flat roofs tend to cost between £1,000 and £8,000. So, choosing the best type of flat roofing system is crucial to ensure it is waterproof, safe and protected from the elements to avoid a costly replacement.
Single-ply membranes are durable, flexible, and resistant to UV radiation and weathering. They can be obtained from single-ply membrane manufacturers like Alwitra. Simple and safe to install, with no naked flames, the synthetic rubber is glued to clean roof decking.
A single layer of synthetic polymer material, such as thermoplastic polyolefin (TPO), polyvinyl chloride (PVC), or ethylene propylene diene monomer (EPDM), is applied to the roof substrate. Single-ply membranes provide long-lasting protection and cost-effective waterproofing to flat roofs.
Modified bitumen is a flat roofing material incorporating added polymers, such as styrene-butadiene styrene (SBS), to improve its performance characteristics. The bitumen is applied to the felt in a molten state, and then a gas torch is used to heat it and fuse it to the roof deck. It is more expensive than a single-ply but is quick and easy to repair.
Traditional flat roof felt is a cost-effective waterproofing solution. It’s made from a bitumen-based material reinforced with a layer of polyester or fibreglass. The felt is applied to the roof in layers, with each layer being overlapped and sealed.
Green roof systems are growing in popularity, with building owners looking to be environmentally friendly and architects providing an attractive look to commercial and residential projects. A green flat roof is a living roof consisting of a layer of vegetation placed on a rooftop. It offers several benefits, including:
Flat roof decks are made from various materials and installed on accessible flat roofs, typically accessed by a staircase or another floor. They provide additional usable space and can increase a property’s value by creating a functional outdoor area. In London, estate agents estimate a flat roof deck terrace can add 10% to 25% to a property’s value.
Here are the top 3 benefits of having a flat roof…
Flat roofs can have their share of issues that owners or prospective buyers should know. Leaks can be a common headache, especially since water doesn’t naturally drain away like on sloped roofs—a key reason why choosing the best flat roofing system is crucial.
So, to enjoy the benefits of a flat roof, you must ensure it’s protected.
There’s a diverse range of flat roofing system options, each with benefits and considerations. From the durability and protection of single-ply waterproofing to the eco-friendliness of green roofs, there’s a solution to fit every need, preference and budget. Despite their challenges, such as drainage issues and the potential for leaks, flat roofs continue to grow in popularity in the UK due to their modern aesthetic appeal, space utilisation potential, and cost-effectiveness.
Moreover, advancements in materials and construction techniques continually improve the performance and longevity of flat roofing systems. For instance, the single-ply membrane detail provides enhanced durability and waterproofing capabilities. Additionally, innovations like flat roof decks offer opportunities to maximise usable outdoor space while adding value to properties.
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