When it comes to safe and reliable roofing materials used for covering flat roofs, one of the most common that comes to mind is felt. As long as it is properly installed, it can prove to be totally reliable.
Before delving deep into felt roofing, it is good that we have a good understanding of what felt roofing is.
What is felt roofing?
This is roofing material that is installed upon flat roofs which you might find on garden sheds, garages and extensions. They are made up of two or three layers of felt sheet which forms a dense and impenetrable barrier. Additionally, they are also coated with waterproofing materials such as tar to prevent the ingress of moisture. These multiple layering is important to ensure that your roof is completely waterproof.
The Benefits of Felt
- It is a proven roofing material, having been used for many years as one of the most common choices.
- It is applicable to any size job; whether large or small
- It is highly durable offering strong resistance to both wind and water
- Felt roofing can be applied to any surface types; whether flat, pitched or curved.
- They can be applied in various ways.
The Disadvantages of Felt
- They usually don’t perform very well under UV light or high temperatures.
- Constant checking and maintenance is needed.
- Felt roofing requires the skills of professionals.
- Because felt roofing materials are heavy, it attracts high transport cost and heavy loadings.
- It has a limited life span and also difficult to recycle
There are two ways or techniques of installing felt roofs.
- hot works
- cold works
Let’s have a look at both of them.
- ‘Pour and roll’ technique – this technique involves pouring hot bitumen as the felt is unrolled along the roof. This ensures that voids are filled and when cooled acts as an adhesive which bonds and seals the layers.
- Torching-on – this involves heating felt with a gas torch making it so no bonding is required. In general, this technique could be used for both small and medium sized roofing as well as in flat roof repairing.
- This involves applying cold adhesive evenly onto the roof and felts unrolled positional. This method is obviously easy and safe compared to the hot works technique.
- This involves placing self-adhesive membranes in the correct position on the roof and then peeling off the release paper. However, this is not suitable for uneven surfaces or applied in cold conditions.