Home Roofing Roof Replacement or Re-roofing – How to Decide What You Need

Roof Replacement or Re-roofing – How to Decide What You Need

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Roofing is an integral part of a building requiring careful attention. Mistakes and a wrong decision could easily have structural implications, not to mention the degradation of living standards, especially in the Blue Mountains, NSWs rugged terrain. Although not known for its snowfall, the Blue Mountains see upwards of 1000 mm of rain annually. Coupled with the regions popularity as a tourist destination, homeowners and business owners need to keep their properties looking their best. Therefore, you will eventually have to plan beyond the usual upkeep and consider full-scale restoration or replacement. The question then becomes whether you should opt for re-roofing or a comprehensive roof replacement. Here we discuss the difference between the two and when roof replacement in the Blue Mountains could be better. 

What does roof replacement mean? 

Replacing the entire roof involves stripping away the old shingles and exposing the deck underneath before adding a new layer. An underlayment or felt paper is applied to the deck to protect it from water and other elements. However, if this layer appears damaged, it must be repaired to prevent further damage during the installation of the new roof.

The pros 

  • Lasts longer than re-roofing. 

  • Creates access to the deck and thus allows identification of damage; 

  • Maintain insurance coverage; 

  • Increased property value; 

  • Peace of mind; 

  • Long-term ROI.

The cons 

Renovating the roof requires more materials, time, labour and, thus, money. 

What is re-roofing? 

On the other hand, re-roofing involves adding a second layer of shingles to the roof. Re-roofing is a relatively quick and cheap method to restore your roof and improve the property’s value. However, unlike roof replacement, there are a few conditions. You can choose this option only if you have not installed a second layer. Any more than two, and you risk adding too much weight to the building’s structure. Furthermore, re-roofing only works with asphalt shingles. Any other material will not bond well and just end up wasting resources.

The pros 

  • Reduced material, time and money consumption; 

  • Quick restoration; 

  • Increase property value in the short term.

The cons 

  • Only applicable if you have a single layer of shingles; 

  • Only valid if you have asphalt shingles installed; 

  • May hide the damage that otherwise needs attention;

Cost comparison – re-roofing vs roof replacement 

First, we discuss the factors determining costs for re-roofing and roof replacements in the Blue Mountains. Generally, the price varies based on job size, conditions, location, materials used and subsequent labour/equipment requirements (such as roof jacks). 

  • Gradient – a steep slope makes it more difficult to me around, sometimes requiring special safety equipment; 

  • Materials  asphalt shingles are cheap and easy to re-roof. On the other hand, metal roofing costs more in materials and installation; 

  • Accessibility – if it is challenging to get vehicles close to the house, the materials will have to be carried manually from the truck and up to where they are needed, requiring further labour and effort; 

  • Additional features – workers will have to work around any skylight or chimneys, thereby increasing labour costs.

Now let us look at how replacement and re-roofing defer in terms of cost. The following list should give you a good idea but is in no way exhaustive: 

  • Demolition – Removing the old roofing and preparing the deck for new shingle is a labour-intensive task and an added cost; 

  • Carriage  Some roofers may also charge a fee to haul away and dispose of old materials and debris; 

  • Materials  materials used differ between roof replacement and re-roofing. For example, re-roofing is only possible with asphalt shingles. Any other material either does not bond as well or cannot be layered due to weight restrictions (i.e., metal). 

To sum it all up, choosing between re-roofing and roof replacement in the Blue Mountains area hinges on the size of your budget, how much time you have and what materials are currently installed. The table below provides a quick recap. Take a look and good luck! 




Roof Replacement 





Asphalt Shingles 









Within 10 years 

10 years or more 


Disclaimer: This is a generic Information & post; content about the services can be changed from time to time as per your requirements and contract. To get the latest and updated information, contact us today or visit our website. 

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