When it comes to home improvements, one of the most difficult and costly tasks is to get a roof replacement. But what is a roof replacement and is it right for you?

What Is A Roof Replacement?

The exterior of houses is often neglected by homeowners it can be a hugely costly to carry out any large-scale work such as painting the exterior walls or making improvements to the structure.

A roof replacement, otherwise known as re-roofing, is the process of removing everything on the roof, right down to the deck and then installing new roof tiles.

This is often done due to broken or dislodged roof tiles, leaks or wide scale damage, but sometimes is done simply to improve the kerb appeal of the property.

When Is A Roof Replacement Required?

There are a number of situations in which a full roof replacement is required:

  • Roof sagging – if roof tiles are beginning to sag or bow in the middle this is a large-scale problem that can only be resolved through removing roof tiles and re-aligning them.
  • Large scale broken tiles – large scale missing or broken tiles may be too much to simply spot repair, requiring a full roof replacement.

The reality is, although many suggest that a roof should be replaced every 20 years and that moss growth may lead to a roof replacement, this does not always mean that one is required.

The cause of roof deterioration more often than not is moisture. It is a commonly held belief that roof tiles are waterproof, although this is not always the case. Roof tiles are porous, meaning they absorb moisture. When this moisture is absorbed by the roof tiles, it can cause cracks that allow moisture to enter once again. After a period of time, moss can grow within these cracks, causing further damage. This cycle continues until roof tiles begin to crack and become extremely unsightly with large moss growth.

What Are The Alternatives?

A roof replacement could cost on average between £5,550 to £8,250, which is a huge cost that is not always necessary. If your roof doesn’t have wide scale damage, there are a number of potential options:

  • Roof repair – sometimes a few broken tiles can be easily repaired without re-roofing the full area.
  • Roof coating – a roof coating is a coloured roof paint that is applied to the roof tiles. Many of these coatings form a protective barrier on the roof tiles that can help protect them and extend their lifespan.
  • Roof tile sealers – roof sealers are clear treatments that do not alter the appearance of roof tiles, but create a water repellent barrier that extends their lifespan.

If you have broken roof tiles, it is highly recommended that you have a professional take a look at your roof and repair these defects, as this will cause further damage moving forward if not dealt with. If the roof is still sound, or once it has been repaired, having a roof coating or roof sealant applied will not only improve the appearance of the roof, but can also prevent any damage that could lead to a roof replacement.

Roof Coatings

A waterproof roof coating is perfect for transforming a roof, from unsightly to the envy of the street.

They form a water repellent coating on the surface of roof tiles that prevents moisture absorbing into the roof tile, while maintaining full breathability to allow moisture to escape the property. If a roof coating is not breathable, it should never be applied to a property.

Whether you opt for a modern grey shade or a rustic brown, a newly coated roof can completely transform a property.

Roof Tile Sealers

Roof tile sealers work in the same way as a water repellent roof coating, preventing any moisture from absorbing the roof tiles, while allowing moisture to escape the roof as it remains completely breathable.

The key difference with a roof sealant is that is it a clear roof treatment that will not alter the appearance of the roof. This is perfect if you want to maintain a more rustic look on your property, while still protecting it from the elements.

Manufacturers of super hydrophobic roof coatings and roof sealants often offer guarantees that ensure your roof can be protected in excess of 10 years, helping to extend the lifespan of your roof further than the 20-year guideline that is often suggested for a roof replacement.

They are a fantastic way to add value to your property at a fraction of the cost of a roof replacement. Not only this but they are much less disruptive to the property as they can be applied by one person.


To summarise, a roof replacement while costly is an often-necessary home improvement in order to maintain the integrity of your home. Having said this, there are other alternatives that are suitable if you do not have a large-scale structural issue with your roof. Consult a professional and identify whether or not your home needs a full roof replacement or whether there are other cost-efficient ways to improve the performance and aesthetic of your roof.

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