Roofing is often used to seal rooftops in a simple and cost-effective manner. The building material is cheap and easy, which is why it is also suitable for many other purposes. Find out in this guide from Heimhelden.de how to proceed if you want to bond the roofing felt on your roof.
Areas of application for roofing felt
Roofing felt is often laid on the roof of the garden house or carport. This is because the tar paper is a cost effective way to seal against water. In addition, roofing felt is also used to additionally seal tile roofs. For this, it is attached as a second layer below the tile roofing. In addition, roofing felt can be used to seal wet rooms, ponds or exterior walls. It is also often used to coat insulating materials.
Nailing or gluing - which version is better?
There are basically two different ways to professionally install roofing felt:
- Possibility: fixing the roofing felt with nails
- Works fast and easy
- Especially suitable for sloping roofs
- Possibility: Bonding the roofing felt with special adhesive
- Optionally with cold glue or hot bitumen possible
- Ideal for sealing flat roofs
If you want to Laying roofing felt on a flat roof, bonding is always the better way to ensure long-term protection against waterlogging. This creates a coherent surface that is waterproof. If the roofing felt is carefully bonded, neither running water like rain nor stagnant water like melting snow can penetrate through the roof skin into the interior. This variant is also a bit more expensive than the nailing of the roofing felt. Nevertheless, with our tips, you will be able to bond the individual webs professionally.
Bonding the roofing felt - Which materials and tools are needed?
Before you can start to stick the roofing felt on your roof, you should go to the hardware store get the necessary materials. Which building materials you need depends on which bonding method you choose: On the one hand you can glue the roofing felt with hot bitumen or special cold glue. On the other hand, it is possible to buy directly self-adhesive roofing felt. It has adhesive surfaces, which are provided with a protective film. You only need to peel off this film to glue the roofing felt to the substrate much like double-sided adhesive tape. However, the prices for self-adhesive roofing felt are higher than for conventional tarpaper.
- Roofing felt
- Nails for roofing felt
- Cold glue
- Optional bitumen for heating
In addition, you should have the following tools at your disposal:
- Gas burner
- Optional: Tacker
In general, only experienced craftsmen should glue the roofing felt on the roof surface, as they quickly leak. If in doubt, contact a roofer directly to avoid having to pay high repair costs later.
Bond roofing paper with cold glue or hot bitumen
If you have decided to use bitumen or cold glue in order to To bond the roofing felt, it is best to follow the instructions below:
Before the laying can begin, the surface should be cleaned. It must be free of pebbles and dirt because bumps through the roofing felt. As a result, cracks and breaks are created over time, which the water can easily penetrate.
You should wear protective clothing while working, covering your legs and arms. Otherwise, you risk injury from the hot tar.
Once the roof surface has been properly prepared, gluing can begin.
First, the individual sheets of the roofing felt are rolled out. With sloping roofs you go from the bottom up. If your roofing felt is already covered with a bitumen layer, you must use a welder to heat this layer as you roll out the roofing felt.
Next, place the roofing felt at the edges. The individual panels should overlap by about ten centimeters.
Be careful to align the roofing paper with care, as the bitumen will solidify immediately and no subsequent correction is possible.
If using external bitumen, skip ahead The heated mass after rolling out of the individual webs evenly with a brush. In this procedure, it is advisable to nail down the roofing felt before gluing to fix it. Likewise, if you want to use cold glue. Here, too, it is important that you spread the bitumen particularly well at the edges of the sheets.
Relocate self-adhesive roofing felt
Self-adhesive roofing felt can only be fixed to the flat roof if the outside temperature is at least ten degrees Celsius. Otherwise, the self-adhesive coating will not be able to achieve the desired effect.
Roll out and align the roofing felt sheet by sheet. The tracks should overlap each other by about ten centimeters. Now pull off the protective films of the overlapping webs. Press the ends of the webs piece by piece tightly.
Only lift the webs very carefully in the transverse direction as this can quickly cause kinks. Careful technique prevents any cracks from forming later.
Then re-work with a stiff brush.
You can increase the durability of glued roofing felt by adding then nailing or clinging the individual sheets.
Further Tips and Tricks for Bonding Roofing Paper
You should prepare very smooth surfaces by coating them with cold glue just one or two days before actual laying. After laying the first layer of roofing felt, glue the second layer on top. In general, a new layer of roofing felt must be glued to the roof at regular intervals, because after a few years the material will become brittle. For best results, treat the cracks with cold glue beforehand.
If you want to lay roofing felt on a flat roof, it should stick together to protect against waterlogging. The tar paper can be glued with hot bitumen or cold glue. Alternatively, self-adhesive roofing felt is also conceivable.
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