What are the differences between flat roofs and pitched roofs?
- by Dina Vaisman
- Nov 07, 2025
- Roofing Questions
The technical difference between a flat roof and a pitched roof is the degree of the slope. A pitched roof is defined by a slope of 10 or more degrees. Pitched roofs are very common in residential buildings in the UK, whereas flat roofs are more commonly seen on commercial buildings or schools.
Please see the points below that we will cover in this article:
Flat roofs
Pros of flat roofs
- If remedial works are required, it would be easier to get roof access
- Great for commercial buildings or modern aesthetics
- Can make the most of the entire roof area of a building, rather than having limited space with a pitched roof
- Can be quicker to install
- Can be inexpensive to install, as less materials are generally required
Cons of flat roofs
- May have shorter lifespan than pitched roofs, because they are more exposed to weather conditions
- Can hold water if incorrectly specified
- They will need to be inspected or maintained more regularly than pitched roofs
Pitched roofs
Pros of pitched roofs
- Longer lasting than flat roofs, as they can last for around 100 years
- Traditional style, which is suitable for a lot of homes and out houses
- Can withstand weather conditions.
- Can work out to be better value than flat roofs, as they last longer and require less maintenance
Cons of pitched roofs
- Can be more expensive to install than flat roofs
- Can take longer to install than flat roofs
- It is not as easy to access pitched roofs when maintenance is required
Wonderbuilds materials
Whether your project entails a flat roof or a pitched roof, at Wonderbuilds, we have a range of products available. Contact us at admin@wonderbuilds.co.uk if you have any questions about the products listed below!
Materials for pitched roofs
For pitched roof projects, we can offer Breather Membranes, Dry Ridge Kits, and Bitumen Shingles.
Breather Membranes available:
Dry Ridge Kits available:
Bitumen Shingles available:
Materials for flat roofs
For flat roofs, we can offer Torch-on/Self Adhesive Bitumen Membranes and Bitumen Kegs.
Bitumen Felts available:
FAQs
What are the main pros and cons of flat roofs?
- Flat roofs can be more appealing as they have a more modern look, however, they are expected lifespan is dependent on type of membrane used
What are the main pros and cons of pitched roofs?
- Pitched roofs are longer lasting, however, they are not suitable for certain architectural styles.
Quick summary
Both pitched roofs and flat roofs have their benefits and downsides. Whilst flat roofs can be easier to install and maintain, pitched roofs can have better value, as they are longer lasting and more durable.
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