Replacement of rotten bay window roof on a terrace in Swindon

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Flat Roof Replacement for Bay Window in Swindon

Our downstairs bay window roof needs to be replaced. It’s a square bay window with white PVCu frames, and the wood underneath the roof is completely rotten. The current roof material is roofing felt, and the property is a terraced house built between 1970 and 2000. We need the wood and the roof replaced. Please advise.

Expert Advice on Replacing a Bay Window Roof

Replacing a bay window roof requires addressing both the visible roofing material and the underlying structure. Rotten wood must be replaced to ensure the new roof is secure and durable. Given the property’s age and location in Swindon, proper materials and techniques will ensure a lasting result.

Steps for Replacing a Bay Window Roof

1. Removing the Old Roof

The existing roofing felt and any remaining wooden substrate are carefully removed. This step involves inspecting the surrounding frame and PVCu elements to ensure they are not compromised by water damage.

2. Replacing the Wooden Substrate

All rotten wood is replaced with treated timber to resist future moisture damage. This creates a strong base for the new roof. Additional waterproofing measures, such as a breathable membrane, may be added for protection.

3. Installing the New Roof

For a durable and visually appealing finish, common replacement materials include:

  • EPDM Rubber Roofing: A popular flat roofing material that offers excellent waterproofing and durability.
  • GRP Fibreglass: Lightweight and seamless, this option provides a modern look and long-lasting performance.
  • High-Quality Roofing Felt: A cost-effective solution suitable for smaller roofs like bay windows.

The choice depends on your budget and aesthetic preferences.

4. Finishing Touches

Once the roof is in place, edges and seals are reinforced to prevent leaks. Flashing may be added to ensure a seamless connection between the roof and the PVCu window frames.

Costs and Timeline

The cost of replacing a bay window roof varies based on materials and labour. For a standard square bay window roof (approx. 1–2 m²):

  • Wood Replacement: £150–£300 depending on the extent of rot.
  • New Roof Installation: £500–£1,200 depending on material choice.

The project typically takes 1–2 days, ensuring minimal disruption.

Local Considerations in Swindon

In Swindon, properties built between 1970 and 2000 often feature flat felt roofs for bay windows. While economical, felt roofs have a shorter lifespan compared to modern alternatives like EPDM or fibreglass. Frequent rainfall in Wiltshire also makes proper waterproofing essential for longevity.

Benefits of Upgrading the Roof

Replacing the old roofing felt with modern materials improves weather resistance and insulation. EPDM and fibreglass roofs, for instance, are less prone to cracking and can last up to 30 years with minimal maintenance. This upgrade enhances both the functionality and aesthetic appeal of your bay window.

Preparation for Homeowners

To prepare for the replacement, clear the area around the bay window for easy access. If the window itself is used for seating or storage, remove items to protect them from dust or debris during the work.

Related Services

Consider checking the condition of nearby guttering or fascias, as these often require maintenance alongside roof repairs. Learn more about our gutter repair services in Swindon or explore options for window upgrades in Wiltshire.

For more information on flat roof replacements in Swindon and nearby areas like Royal Wootton Bassett and Cricklade, contact our team today.