Skip to main content Skip to search Skip to main navigation
Go to homepage
Does Pipe Rehabilitation Shrink the Diameter Too Much?

Does Pipe Rehabilitation Shrink the Diameter Too Much?

Daniela Brandt
08.04.2025

When resin and laminate are applied during pipe rehabilitation, the inner diameter of the pipe naturally becomes smaller. Some homeowners may wonder whether this reduction could lead to problems.

But we can reassure you—it’s not an issue. The dimensions of drainage systems and pipe diameters are strictly regulated according to DIN standards (e.g., DIN 1986-100 and DIN 12056). The thickness of our rehabilitation materials stays well within the permitted tolerances, typically ranging between 2.5 and 5 mm, depending on the pipe size. This ensures that the minimum diameter remains guaranteed. Our systems comply with building regulations, so purchasing materials from us means you won’t run the risk of incorrect rehabilitation.

Additionally, pipes are cleaned before rehabilitation, which alone can slightly reduce their inner diameter. Essentially, rehabilitation restores the original pipe cross-section. If 2-3 mm of rehabilitation material is applied, a DIN 100 pipe undergoes a reduction of 3 mm on each side, resulting in a new inner diameter of 94 mm. This doesn’t factor in potential material wear on an old pipe. Even for SML pipes with a DIN 100 standard inner diameter of about 90 mm, this reduction remains within the tolerance range.

So, don’t worry! Our materials and rehabilitation products comply with all relevant regulations and are used successfully by professionals every day.

________________________

Here’s a direct link to the LinkedIn profile of Dr. Daniela Brandt, the author of this post.
Or simply scan the QR code with your phone:

Related Products
Skip product gallery

Sanikom In House Liner SX2 3 mm 90° Bends DN 40 - 300

Sanikom In House Liner SX2, thickness 3 mm, for bends up to 90°, available from DN 40 to DN 300.  Very flexible liner in all directions going through 90 degree bends very easily and with a low pressure.  Resin Compatibility EXRR-2, EXR-2, EX1-2 and EX2-2 - Curing: Ambient, Water 70°, Steam 80°. Order unit: meter, price per meter.

From £13.86*
Details

Inversion Drum Sanidrum 400 With 6" Storz

Sanidrum 400 Inversion Drum with 6" Storz - low weight (14,5 kg) inversion drum made of composite material.   New design - What is new? - Completely new wheel system with extremely durable rubber wheels (diameter 30 cm) - New leg system with rubberised legs connected to a square connection for better stability - New aluminium frame - Higher inversion drum, 15 cm higher than in the old version - Equipped with a safety valve of 1,1 bar   High temperature resistance, no corrosion and easy maintenance. Can even be used with steam as heating media. The new Sanidrum inversion drum series has an improved stability and durability and can even resist more pressure to install inversion liners.

£3,702.60*
Details

Flex Packer with Bypass - DN 150-300 mm - Sanikom

Flex-Packers in various sizes from 150 - 300 mm and lengths up to 5m. Sanikom inflatable packers are used in domestic and house pipe systems. The Packer REDESIGN, seen for the first time in the market, involves details important for those who operate with packers to simplify their efforts.   Sanikom Flex Packers offer a variety of advantages compared to other packer systems: - Up to 30% less in weight than the existing packer systems on the market - Up to 25% less in length than the existing packer systems on the market - Up to 30% more flexibility than the existing packer systems on the market - Unique wheel assembly adjustment with no unscrewing. Modular system replacing present different packer types like flex and long. No more complicated adjustment of the wheel system for each diameter of the pipe, just click and done. With Sanikom flexible packer it is easy just click on the wheel system turn it to right diameter and you are ready.   Inflatable packer design enables adding bypass flexible hose through without even disassembling the entire inflatable packer. 

From £1,288.98*
Details

Blue Epoxy Systems For In-House and Lateral Systems

Sanikom epoxy resin bundle for in-house and mainline rehabilitation, hardens very quickly. Epoxy resin system for the house and house connection area, consisting of epoxy resin and hardener. In combination with pipe liners or a felt hat it creates a robust material for sewer pipes. Blue colored product for easier control during processing and for visibility in the pipe. Very pleasant to process due to its slightly thicker consistency. Due to its special flow properties, it also adheres excellently to the fabric. Very fast curing times compared to other products in the same price category! Price per bundle.   There are 5 different epoxy systems to choose from (for properties, see Technical Data):   EXRR-2 (Bundle 14 kg + 4,2 kg) and EXR-2  (Bundle 14 kg + 3,92 kg) - medium viscosity - cure very quickly at room temperature - suitable for cold regions such as Scandinavia as they react down to 5 degrees Celsius - high mechanical and Résistance chimique as well as temperature resistance even when cured in the room - hardeners from both systems can also be used in combination with SANIKOM thick epoxy resin so that they do not run into the lateral or internal connection.   EX1-2 and EX2-2  (Bundle each 14 kg + 3,5 kg) - Medium viscosity - Fast curing - Suitable for short to medium installation lengths - High mechanical and Résistance chimique as well as temperature resistance even with room curing - Hardeners from both systems can also be used in combination with SANIKOM thick epoxy resin so that they do not run into the side or in-house connection.   EX4-2  (Bundle 14 kg + 2,8 kg) - Excellent reactive system with low viscosity and a good ratio between processing and curing time - suitable for short to medium installation lengths - high mechanical and Résistance chimique as well as temperature resistance when the epoxy system is cured at a temperature of 50-80 degrees Celsius.   WARNING Processing epoxy resins poses health risks. Please wear your PPE and be sure to follow the instructions in the respective safety data sheet! If you have any questions about sewer renovation with epoxy resin, please contact our customer service.

Content: 18.2 Kilogramm (£16.20* / 1 Kilogramm)

From £232.85*
Details