Installing a new roof is an excellent way of making your home stylish and comfortable. You can choose from many different materials to add durability and functionality to your new roof.

However, if your home was built during or before the 1970s, there's a chance that your roof contains asbestos. Asbestos was widely used to insulate roofs against fire damage and leaking air. It was commonly sprayed as a coating or as a form of ceiling tile. Due to the health hazards of asbestos (it can cause lung cancer and other respiratory complications), it needs to be handled with extreme caution.

If your roof contains asbestos, replacing it will come with additional expenses. Asbestos roof replacement costs will largely involve the safe removal and disposal of asbestos from your old roof. Consider the following cost factors when replacing your asbestos-containing roof.

1. The type of roof being replaced

Older tile roofs are the most common culprits for asbestos content. Asbestos was commonly used in cement tile, coatings and roof shingles in such roofs. Therefore, roofs made of tile will often cost more to replace. This is because they're likely to have higher asbestos content than most other roofing materials.

In addition, if your roof is damaged by cracks and scrapes, it may also require a more delicate removal process. Damaged roofs are more likely to release harmful asbestos fibres into the rest of your home.

2. Asbestos content and type

The type of asbestos content will also largely affect removal and replacement costs. Asbestos exists in either a free or bound form. Free (or friable) asbestos can easily release harmful fibres into the air and cause many health risks. On the other hand, bound asbestos is not harmful unless it's disturbed.

Most roofing cement only contains bound asbestos. This makes it more cost-effective to safely remove and replace. However, damaged roofing materials (such as roof shingles, siding and coating) may contain friable asbestos. Thus, if your roof is damaged and worn out, the replacement cost will likely be higher.

3. Size of the roof

Larger roofs that contain asbestos will also cost more to remove and replace. This is because each section will need to be carefully handled during the process. A larger area will also need to be cleared in preparation for re-roofing.

As long as any part of the roof contains asbestos, the removal process will need to be carried out with caution and attention to detail.

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