Installing and repairing bitumen roofing
A flat roof with bitumen lasts for years, but not forever. At some point, you will see blisters in the top layer, cracks along the edges, or a damp spot on the ceiling of the extension. These are signs that the bitumen needs replacing.
DMS Holland expertly installs and repairs bitumen roofing from Dedemsvaart throughout Drenthe, Overijssel, and the rest of the Netherlands.
Blisters, cracks, or leaks on your flat roof? Worn bitumen allows moisture to penetrate into the structure. DMS Holland expertly replaces and repairs bitumen roofs, tailored to your roof and situation.
- 25+ years of experience
- VCA certified
- Transparent quotes
When is your bitumen roof due for replacement?
Bitumen has been the most widely used material for flat roofs for decades. A well-constructed two-layer roof easily lasts fifteen to twenty years. But wind and weather take their toll. UV radiation makes the top layer brittle, temperature fluctuations cause the material to expand and contract, and play develops at the seams and upstands over time.
You can recognize a worn roof by blistering, bare patches where the slate finish has disappeared, or cracks in the top layer. Often, a leak starts inconspicuously. The moisture first seeps into the insulation and the underlying woodwork before you see a stain inside. By that time, the damage is greater than just the roofing.
We regularly encounter damaged bitumen during a roof cleaning or inspection. Sometimes a targeted repair of a seam or upstand is sufficient. Is the top layer worn in multiple places? Then a new layer is wiser than continuing to repair. We will tell you honestly what yields the best results in your situation.
How do we handle your bitumen roof?
Working on a flat roof requires proper preparation and safety. We work according to our VCA standards and deliver the roof clean and dry. You do not need to go onto the roof yourself.
Inspection and advice
We assess the condition of the existing bitumen, the joints, the upstands, and the drainage. Based on this, we advise repair or complete replacement and coordinate the approach with you.
1
Prepare or tackle the old layer
For a repair, we clean the damaged area and seal the seam or crack watertight. For replacement, we remove the worn layer or work over it, depending on the substrate.
2
Applying new bitumen
We apply the new bitumen in strips and waterproof the seams, edges, and upstands. The top layer with slate chippings protects the roof against UV rays and weather influences. Afterwards, your roof will be waterproof for years to come.
3
Inspection and delivery
Before we leave, we inspect the entire roof: are all seams sealed, do the upstands fit properly, and does the water drain freely to the drain? Where necessary, we test the roof with water. We leave the work site clean and review the completed work with you. This way, you know exactly what has been done and what you can count on.
4
Why your roof is in good hands with us
Sleek and waterproof finish
With a flat roof, the devil is in the details. The seams, the upstands, and the connection to the roof edge determine whether a roof remains watertight. We take the time for this. A neat finish is the difference between a roof that lasts for years and one that leaks again in two years.
Transparent working method
What you can expect from us: transparent quotations, a clear schedule, and a clean handover. Our team works quickly and neatly, without any surprises afterwards.
Certified craftsmanship
DMS Holland is VCA certified and works according to the quality guidelines of Keurmerk Schoon Garant. This ensures you receive safe, professional, and reliable roof maintenance.
Curious about the condition of your flat roof?
How much does roofing cost?
For roofing, we offer a price on request, as costs vary significantly per roof. The roof surface is the basis, but the condition of the current roofing makes the biggest difference: sometimes an overlay is sufficient, while other times the old layer must be completely removed. Details such as roof edges, penetrations, and rainwater drains also play a role. During the free roof inspection, we assess what your roof truly needs and provide you with a quotation tailored to your needs.
Frequently asked questions about bitumen roofing
A professionally installed two-layer bitumen roof lasts an average of fifteen to twenty years. The exact lifespan depends on the quality of the installation, the location of the roof, and how well it is maintained. An annual visual inspection significantly extends the lifespan.
For localized damage, such as a loose seam or a crack at an upstand, a targeted repair is often sufficient. Is the top layer worn in multiple places, or is there blistering across the entire roof? Then replacement is the wiser choice. During the inspection, we will show you what best suits your situation.
Yes. In the event of a leak, we trace the cause and seal the damaged seam or upstand. If the damage is more extensive than it appears at first glance, we will discuss with you whether applying a new layer would be more sensible. This prevents the problem from recurring.
Yes. We work on all flat roofs suitable for bitumen, from a small dormer or extension to a garage or commercial building. For residential and commercial clients.
Ready to tackle your facade or roof?
We would be happy to visit you without obligation for an inspection and personalized, tailored advice.
- Response within 24 hours, also via WhatsApp.
