We provide internal training courses focused on environmentally friendly and sustainable working methods. A large portion of your materials is recycled. In addition, we train our roofers to work as efficiently and carefully as possible with the materials used.
Replace or repair your bitumen flat roof?
Do you want to replace or repair your bitumen flat roof? This may be necessary, for example, if you have a leak in your flat roof or if your bitumen roof is worn. We are your specialist for replacing and/or repairing your roof.
Most flat roofs in the Netherlands are covered with bitumen roofing. This is because bitumen has a long lifespan. Bitumen is durable and easy to repair or renovate. This makes it possible to recycle or renew a worn roof. Renewal is carried out by applying a new top layer (overlaying). This top layer is bonded using heat.
Bitumen roofing is the most commonly used roofing material
Bitumen roofing is the most commonly used roofing material on flat or slightly pitched roofs. Its strong adhesion and excellent waterproof properties make it particularly suitable for the Dutch climate. In addition to bitumen roofs, we also frequently encounter mastic asphalt roofs. In the event of a leak in a mastic asphalt roof, we replace the flat roof down to the roof deck.
Leak in bitumen roofing
Do you have a leak in your bitumen roofing? This can be caused by worn bitumen roofing or clogged drains. Proper maintenance can slow down wear on your roof. For example, check your roof edges, drains, penetrations and seams for ageing or potential leak points.
Bitumen roof inspection
During a roof inspection of your bitumen roof, we assess the condition of the bitumen roofing. We identify risk areas and check the drains, penetrations, roof edges and the roof slope. Your flat roof is fully inspected for ageing and wear. Signs such as cracking and dried-out bitumen roofing indicate that the roofing material has deteriorated.
Do not wait too long to renovate your bitumen roof. There is a significant risk that cracks and gaps will increase in size due to factors such as frost. If properly assessed, the top layer of your roofing can often still be renovated. If the condition is very poor, we recommend carrying out a more extensive inspection. If the condition of the underlying layer is unknown, we will make test cuts in the roofing.
Contact us for a free roof inspection.
Sustainable & environmentally friendly
White roofing
Climate change and the rise of energy-neutral homes call for efficient solutions. We are increasingly installing white roofing. Because heat from UV radiation is reflected, this provides improved insulation performance. In addition, it has a positive effect on your solar panels.
Specialist and certified in bitumen roofing
DakspecialistNL is specialised and certified in the installation of bitumen roofing. We work exclusively with high-quality materials. This allows us to offer a minimum warranty of 15 years on new construction or full renovation projects. We install two types of bitumen roofing: APP and SBS.
APP bitumen flat roof replacement
APP (atactic polypropylene) is a modified type of bitumen. Plastics are added to strengthen the bitumen. APP bitumen roofing is a very reliable and high-quality roofing material. If you are looking to replace your bitumen roof, APP is an excellent choice. We work exclusively with the highest-quality APP and provide a minimum warranty of 10 years.
The advantages of APP roofing:
- high temperature stability
- high resistance to ageing
- excellent UV resistance
- low maintenance
- suitable for recycling
SBS bitumen flat roof replacement
SBS (styrene butadiene styrene) is also a modified type of bitumen. In this case, plastics are added as well, but these plastics are highly elastic.
Due to its elastic properties, SBS bitumen roofing is very suitable for absorbing movement in the underlying structure. With SBS bitumen roofing, it is often chosen to cover the roof with, for example, a gravel layer, as this type of roofing can become porous more quickly when exposed to UV radiation.
Roof systems
There are various flat roof systems, such as fully bonded systems. These systems are mechanically fixed using a matching and torch-applied underlayer with fastening plates. Fully bonded systems therefore do not need to be weighted with gravel. This is in contrast to loose-laid systems, which do require ballast.
Roof installations
In addition to replacing bitumen roofing, we can also replace, supply or install other roof installations. This includes skylights and roof domes to create additional natural light, as well as ventilation penetrations and ducts. We also have extensive experience in renovating roofs with installations such as solar panels and chimneys on flat roofs. These are often integrated into the overall roofing system. In this way, we can guarantee the quality and warranty of your entire bitumen roofing system.
Roof edges
Roof edges are the finishing elements of your flat roof and are available in various materials and finishes. They are always mechanically fixed because roof edges are sensitive to storm damage. In addition, movement in a flat roof mainly occurs at the roof edges. Due to roof penetrations and drainage on flat roofs, roof edge leaks are a common issue. A loose roof edge or finish can cause an immediate roof leak.
We install the following types of roof edge finishes:
- Traditional aluminium roof trims as roof edges
- Custom-made zinc capping profiles for a clean and durable finish
- Coated steel cover caps, also known as plastisol-coated metalwork (often referred to as sheet metal flashing)
Each material and type has its own advantages. Aluminium roof trims are a commonly used standard type of roof edge. They are easy to install and easy to work with during renovation projects. Zinc roof edges are often custom-made; zinc has a long lifespan and accommodates movement very well. We also frequently work with fabricated steel for a colour-matched and custom-made finish. This can be supplied fully according to your requirements. The material is mechanically installed using colour-matched accessories and the appropriate fixing materials.
Replacing and insulating a bitumen flat roof
When planning your renovation, you can save on energy costs. We always recommend installing insulation on your roof. Flat roofs can be insulated from the inside or from the outside. There are various types of insulation and multiple options for insulating your flat roof. Ask about the possibilities. When installing insulation boards, we use only high-quality insulation from well-known Dutch suppliers.
Installing insulation may sound simple, but a specialist must prevent all thermal bridges. You want to achieve maximum efficiency when insulating your roof. All joints, gaps and cold areas of the roof must be properly sealed. Ask for advice if you want to insulate your bitumen or other flat roof. If necessary, we install a concealed gutter by adjusting the height of the flat roof. This optimises drainage and extends the lifespan of your flat roof. It also allows us to maintain the existing height of your roof edges or roof installations.
Ask your roofer for advice on insulating your flat roof. We specialise in installing insulation in the following ways:
- External insulation with mechanical fixing
- Internal insulation using mineral wool, finished with plasterboard (lowered ceiling)
- Inverted roof system: insulating and then weighting the insulation boards
Insulation saves money. Ask about the possibilities. Free quote and tailored advice.