Newton CDM Overtape (Corner Tape)
Newton CDM Overtape (Newton product references A7 & A8) is a high quality self-adhesive butyl sealing tape used within the Newton CDM Waterproof Membrane System to form watertight seals at joints, overlaps, wall-to-floor junctions, internal corners, service penetrations and other membrane detailing points.
It is designed to maintain the continuity of the waterproof layer wherever Newton cavity drain membranes are overlapped, butted, cut, folded, shaped around an obstacle or interrupted by protrusions. Manufactured from a durable butyl rubber compound, newton CDM Overtape provides strong adhesion, flexibility and long-term resistance to water, air and chemical exposure.
It is supplied in 100mm x 20M (Newton ref A8) and 150mm x 20M (Newton ref A7) rolls, allowing the correct width to be selected for general membrane jointing or more demanding corner and wall-to-floor waterproofing details.
Next Day Delivery
Available on most mainland UK orders
Free Help & Advice
Call 01355 222 777
Mon.-Fri 8:30am - 4:15pm, or email us
Same Day Despatch
On in-stock orders placed before 14:00
Great Service
A proudly independent family business with 40 years experience
Next Day Delivery
Available on most mainland UK orders
Free Help & Advice
Call 01355 222 777
Mon.-Fri 8:30am - 4:15pm, or email us
Same Day Despatch
On in-stock orders placed before 14:00
Great Service
A proudly independent family business with 40 years experience
Key Features of Newton CDM Overtape
✔️ High quality self-adhesive butyl sealing tape for watertight seals at joints, overlaps and wall-to-floor junctions.
✔️ Maintains continuity of the waterproof layer where Newton membranes are cut, folded or shaped around obstacles.
✔️ Durable butyl rubber compound provides strong adhesion, flexibility and long-term resistance to water and chemicals.
✔️ Available in 100mm for general jointing or 150mm for demanding corner and junction detailing work.
✔️ Folds along its length to seat into the wall-to-floor angle, linking wall and floor membranes.
Specialist Butyl Sealing Tape For Newton CDM Membrane Detailing
Newton CDM Overtape is a specialist waterproof membrane sealing tape used to complete the detailed sealing work within Newton CDM cavity drain membrane installations. While Newton waterproof membranes provide the main protective layer across walls and floors, additional sealing is required wherever the membrane is interrupted, joined or shaped around the structure. Areas such as membrane overlaps, butted joints, internal corners, wall-to-floor junctions, pipe entries, cable routes, protrusions and cut sections can all become genuine weak points if they are not detailed correctly during installation. Newton CDM Overtape is applied directly over these areas to link membrane surfaces together, helping to maintain a continuous and dependable watertight barrier throughout the system.
Flexible Butyl Rubber Construction For Reliable Below-Ground Performance
The tape is manufactured from a butyl rubber compound, which is particularly well suited to below-ground waterproofing because it remains flexible, adhesive and resistant to water over long periods of service. Its self-adhesive face bonds securely to clean, dry membrane surfaces and conforms closely to the membrane profile, helping to create a consistent seal around irregular details, corners and shaped sections. The natural flexibility of the butyl rubber allows it to accommodate minor movement within the structure while maintaining close contact with the membrane, making it well suited to basement waterproofing, cellar conversions, retaining wall waterproofing and other Newton CDM System applications where reliable, long-lasting joint sealing is genuinely required.
Two Roll Sizes For Standard Joint Sealing And Wider Detailing Work
Newton CDM Overtape is available in 100mm wide by 20m long and 150mm wide by 20m long rolls, giving installers a practical choice between standard joint sealing and wider detailing work. The 100mm version is well suited to general membrane laps, overlaps and localised sealing, while the 150mm version provides greater coverage for wall-to-floor junctions, internal corners and more demanding waterproofing details. For corner work, the tape is normally folded along its length with the crease set tightly into the wall and floor angle, before the self-adhesive butyl face is pressed firmly onto both membrane surfaces to join them into one sealed detail. On cavity drain installations, a heat gun is often used carefully to dry the membrane and assist bonding, and where a plasterable surface is required, Newton Mesh Tape should be used instead or applied over the top.
| Technical Information | |
|---|---|
| Specification | Detail |
| Newton Product References | A7 (150mm x 20M) and A8 (100mm x 20M) |
| Tape Type | Self-adhesive butyl tape |
| Material | Butyl rubber compound |
| Roll Sizes | 100mm x 20m, 150mm x 20m |
| Main Use | Sealing membrane joints |
| Suitable Details | Corners, laps, penetrations |
| Junction Use | Wall-to-floor sealing |
| Compatible System | Newton CDM system |
| Application Area | Below-ground waterproofing |
| Seal Function | Maintains waterproof continuity |
| Surface Requirement | Clean, dry membrane surfaces |
| Application Aid | Heat gun if required |
| Finish Limitation | Not a plaster key |
| Over-Tape Option | Newton Mesh Tape |
| Typical Use | Basement membrane detailing |
Product Benefits
-
Watertight Joint And Junction Sealing: Newton CDM Overtape helps seal the vulnerable areas of a cavity drain membrane system, including overlaps, butted joints, internal corners and wall-to-floor junctions, where membrane sheets alone cannot form a complete waterproof detail.
-
Strong Butyl Rubber Construction: Manufactured from a durable butyl rubber compound, the tape provides strong adhesion, flexibility and resistance to water, air and chemical exposure, making it suitable for damp, below-ground and aggressive waterproofing environments.
-
Maintains Waterproof Membrane Continuity: The tape links separate membrane sections together and seals interruptions in the waterproof layer, helping reduce the risk of water movement through joints, cut edges, protrusions or changes in direction.
-
Suitable For Newton CDM Installations: Designed for use within the Newton CDM Waterproof Membrane System, Newton CDM Overtape supports correct detailing around cavity drain membranes in basement waterproofing and structural waterproofing projects.
-
Available In Two Practical Widths: Supplied in 100mm and 150mm widths, the tape allows installers to select the most suitable size for general membrane lap sealing, wider wall-to-floor junctions or more demanding corner details.
-
Flexible Around Irregular Details: The butyl compound can conform to small irregularities in the membrane and substrate, helping create a secure seal around shaped membrane sections, uneven backgrounds, services and protrusions.
-
Self-Adhesive Application: The self-adhesive backing allows the tape to be applied directly to clean, dry membrane surfaces without a separate adhesive, making it practical for site detailing and waterproof membrane joint sealing.
-
Supports Long-Term Below-Ground Detailing: Its resistance to water and environmental exposure helps the tape maintain a reliable seal in basements, cellars and below-ground structures where waterproofing details must remain effective over time.
Typical Applications
-
Wall-To-Floor Junction Sealing: Newton CDM Overtape is commonly folded into the wall/floor angle to link the wall membrane and floor membrane, helping create a continuous waterproof detail at one of the most important points in a Newton CDM installation.
-
Membrane Joint And Overlap Sealing: Suitable for sealing overlapping or butted Newton cavity drain membrane joints, helping maintain the waterproof layer where separate sheets of membrane meet across walls or floors.
-
Internal Corner Waterproofing: Used in internal corners and changes of direction where a flat membrane cannot naturally create a sealed junction without additional butyl tape detailing.
-
Service Penetration Detailing: Suitable for sealing around pipes, cables, conduits and other services that pass through the membrane, helping reduce the risk of water movement around the interrupted area.
-
Protrusion And Obstacle Sealing: Used around structural protrusions, awkward shapes and obstacles where the membrane has to be cut or formed, helping close the created joints and maintain waterproofing continuity.
-
Basement And Cellar Waterproofing: Suitable for Newton CDM waterproofing systems used in basements, cellars, retaining walls and below-ground rooms where membrane joints and junctions require careful sealing.
Q) What is Newton CDM Overtape used for?
A) Newton CDM Overtape is used to create watertight seals within Newton CDM Waterproof Membrane System installations, particularly where membrane sheets are joined, overlapped, cut or shaped around details. It is commonly used at wall-to-floor junctions, internal corners, membrane overlaps, butted joints, service penetrations, pipe entries, cable routes and other vulnerable waterproofing points. In basement waterproofing and cavity drain membrane systems, these areas can become weak points if they are not sealed correctly. Newton CDM Overtape links adjoining membrane surfaces together, helping maintain continuity of the waterproof layer and reducing the risk of water movement through joints, edges or penetrations in the membrane system.
Q) How does Newton CDM Overtape work?
A) Newton CDM Overtape works by bonding over interrupted or vulnerable membrane areas to form a continuous butyl waterproof seal. The tape is manufactured from a durable butyl rubber compound, giving it strong adhesion, flexibility and resistance to water, air and chemical exposure. When applied to clean, dry membrane surfaces and pressed firmly into place, the self-adhesive face bonds to the membrane and helps seal the joint or junction. Its flexibility allows it to follow membrane profiles, corners, small surface irregularities and shaped details around obstacles. This makes Newton CDM Overtape especially useful where flat cavity drain membrane sheets cannot create a complete sealed detail on their own.
Q) Where should Newton CDM Overtape be used?
A) Newton CDM Overtape should be used wherever Newton cavity drain membranes need additional sealing at joints, changes in direction or interrupted areas. Typical areas include internal corners, wall-to-floor junctions, membrane laps, butted joints, cut edges, service penetrations, pipework, cables, conduits and protrusions. It is particularly useful in basements, cellars, retaining walls and below-ground rooms where cavity drain membrane systems must be detailed carefully to manage water ingress. The tape should be selected as part of the overall Newton CDM Waterproof Membrane System, rather than used as a standalone waterproofing solution. Correct membrane layout, fixing, drainage and detailing are still essential for reliable long-term performance.
Q) What sizes of Newton CDM Overtape are available?
A) Newton CDM Overtape is supplied in two practical roll widths: 100mm x 20m and 150mm x 20m. The 100mm version is suitable for general membrane jointing, lap sealing, overlap sealing and smaller localised details where a standard-width butyl seal is sufficient. The 150mm version provides wider coverage for more demanding areas, such as wall-to-floor junctions, internal corners and larger membrane transitions. Choosing the correct width depends on the detail being sealed, the size of the overlap and how much contact area is needed on each membrane surface. For high-risk or more complex waterproofing details, the wider 150mm tape is often the more robust option.
Q) How do you apply Newton CDM Overtape at a wall-to-floor junction?
A) At a wall-to-floor junction, Newton CDM Overtape is normally folded along its length so the crease can be set tightly into the internal wall/floor angle. The backing paper is then removed gradually, and the self-adhesive butyl face is pressed firmly onto both the wall membrane and floor membrane. This links the vertical and horizontal membranes into one sealed waterproof detail. The membrane surfaces should be clean and dry before application, and a heat gun is often used carefully to dry the surface and assist bonding. Firm pressure should be applied across the full tape width, avoiding air pockets, loose edges or unsupported bridging at the junction.
Q) Can Newton CDM Overtape be used around pipes and service penetrations?
A) Yes, Newton CDM Overtape can be used around pipes, cables, conduits and other service penetrations where the membrane has been interrupted. These details need careful sealing because any cut through the membrane can create a potential route for water movement if it is not properly protected. The tape can be dressed around the service entry and bonded onto the surrounding membrane to help reconnect the interrupted area into the waterproof layer. Careful shaping and firm pressure are important, especially around irregular protrusions. The surface must be dry, clean and stable before application, and the tape should be applied with full contact and no loose edges.
Q) Can Newton CDM Overtape be plastered or rendered over?
A) Newton CDM Overtape is not designed to provide a direct plaster or render key. Its purpose is to create a watertight butyl seal across membrane joints, corners and detailing points, not to provide a textured surface for finishing materials to bond to. If a sealed joint needs to receive plaster, render or another compatible finish, Newton Mesh Tape should either be used instead where appropriate, or applied over the Newton CDM Overtape to provide a suitable key. This is an important distinction because plaster or render may not bond reliably to a smooth butyl surface. Using the correct finishing detail helps protect both the waterproof seal and the final wall finish.
Q) What are the main limitations of Newton CDM Overtape?
A) Newton CDM Overtape should not be used as a replacement for correct Newton CDM system design, proper membrane installation or suitable drainage provision. It is a detailing tape for joints, corners, overlaps, cut edges and penetrations, not a complete waterproofing system by itself. It must be applied to clean, dry membrane surfaces, as dust, moisture, grease or loose debris can reduce adhesion and weaken the seal. The tape should not be stretched excessively, applied loosely, folded badly or left bridging unsupported gaps. It also does not provide a plasterable surface on its own, so Newton Mesh Tape is required where a plaster or render key is needed over the sealed area.
Key Features of Newton CDM Overtape
✔️ High quality self-adhesive butyl sealing tape for watertight seals at joints, overlaps and wall-to-floor junctions.
✔️ Maintains continuity of the waterproof layer where Newton membranes are cut, folded or shaped around obstacles.
✔️ Durable butyl rubber compound provides strong adhesion, flexibility and long-term resistance to water and chemicals.
✔️ Available in 100mm for general jointing or 150mm for demanding corner and junction detailing work.
✔️ Folds along its length to seat into the wall-to-floor angle, linking wall and floor membranes.
Specialist Butyl Sealing Tape For Newton CDM Membrane Detailing
Newton CDM Overtape is a specialist waterproof membrane sealing tape used to complete the detailed sealing work within Newton CDM cavity drain membrane installations. While Newton waterproof membranes provide the main protective layer across walls and floors, additional sealing is required wherever the membrane is interrupted, joined or shaped around the structure. Areas such as membrane overlaps, butted joints, internal corners, wall-to-floor junctions, pipe entries, cable routes, protrusions and cut sections can all become genuine weak points if they are not detailed correctly during installation. Newton CDM Overtape is applied directly over these areas to link membrane surfaces together, helping to maintain a continuous and dependable watertight barrier throughout the system.
Flexible Butyl Rubber Construction For Reliable Below-Ground Performance
The tape is manufactured from a butyl rubber compound, which is particularly well suited to below-ground waterproofing because it remains flexible, adhesive and resistant to water over long periods of service. Its self-adhesive face bonds securely to clean, dry membrane surfaces and conforms closely to the membrane profile, helping to create a consistent seal around irregular details, corners and shaped sections. The natural flexibility of the butyl rubber allows it to accommodate minor movement within the structure while maintaining close contact with the membrane, making it well suited to basement waterproofing, cellar conversions, retaining wall waterproofing and other Newton CDM System applications where reliable, long-lasting joint sealing is genuinely required.
Two Roll Sizes For Standard Joint Sealing And Wider Detailing Work
Newton CDM Overtape is available in 100mm wide by 20m long and 150mm wide by 20m long rolls, giving installers a practical choice between standard joint sealing and wider detailing work. The 100mm version is well suited to general membrane laps, overlaps and localised sealing, while the 150mm version provides greater coverage for wall-to-floor junctions, internal corners and more demanding waterproofing details. For corner work, the tape is normally folded along its length with the crease set tightly into the wall and floor angle, before the self-adhesive butyl face is pressed firmly onto both membrane surfaces to join them into one sealed detail. On cavity drain installations, a heat gun is often used carefully to dry the membrane and assist bonding, and where a plasterable surface is required, Newton Mesh Tape should be used instead or applied over the top.
| Technical Information | |
|---|---|
| Specification | Detail |
| Newton Product References | A7 (150mm x 20M) and A8 (100mm x 20M) |
| Tape Type | Self-adhesive butyl tape |
| Material | Butyl rubber compound |
| Roll Sizes | 100mm x 20m, 150mm x 20m |
| Main Use | Sealing membrane joints |
| Suitable Details | Corners, laps, penetrations |
| Junction Use | Wall-to-floor sealing |
| Compatible System | Newton CDM system |
| Application Area | Below-ground waterproofing |
| Seal Function | Maintains waterproof continuity |
| Surface Requirement | Clean, dry membrane surfaces |
| Application Aid | Heat gun if required |
| Finish Limitation | Not a plaster key |
| Over-Tape Option | Newton Mesh Tape |
| Typical Use | Basement membrane detailing |
Product Benefits
-
Watertight Joint And Junction Sealing: Newton CDM Overtape helps seal the vulnerable areas of a cavity drain membrane system, including overlaps, butted joints, internal corners and wall-to-floor junctions, where membrane sheets alone cannot form a complete waterproof detail.
-
Strong Butyl Rubber Construction: Manufactured from a durable butyl rubber compound, the tape provides strong adhesion, flexibility and resistance to water, air and chemical exposure, making it suitable for damp, below-ground and aggressive waterproofing environments.
-
Maintains Waterproof Membrane Continuity: The tape links separate membrane sections together and seals interruptions in the waterproof layer, helping reduce the risk of water movement through joints, cut edges, protrusions or changes in direction.
-
Suitable For Newton CDM Installations: Designed for use within the Newton CDM Waterproof Membrane System, Newton CDM Overtape supports correct detailing around cavity drain membranes in basement waterproofing and structural waterproofing projects.
-
Available In Two Practical Widths: Supplied in 100mm and 150mm widths, the tape allows installers to select the most suitable size for general membrane lap sealing, wider wall-to-floor junctions or more demanding corner details.
-
Flexible Around Irregular Details: The butyl compound can conform to small irregularities in the membrane and substrate, helping create a secure seal around shaped membrane sections, uneven backgrounds, services and protrusions.
-
Self-Adhesive Application: The self-adhesive backing allows the tape to be applied directly to clean, dry membrane surfaces without a separate adhesive, making it practical for site detailing and waterproof membrane joint sealing.
-
Supports Long-Term Below-Ground Detailing: Its resistance to water and environmental exposure helps the tape maintain a reliable seal in basements, cellars and below-ground structures where waterproofing details must remain effective over time.
Typical Applications
-
Wall-To-Floor Junction Sealing: Newton CDM Overtape is commonly folded into the wall/floor angle to link the wall membrane and floor membrane, helping create a continuous waterproof detail at one of the most important points in a Newton CDM installation.
-
Membrane Joint And Overlap Sealing: Suitable for sealing overlapping or butted Newton cavity drain membrane joints, helping maintain the waterproof layer where separate sheets of membrane meet across walls or floors.
-
Internal Corner Waterproofing: Used in internal corners and changes of direction where a flat membrane cannot naturally create a sealed junction without additional butyl tape detailing.
-
Service Penetration Detailing: Suitable for sealing around pipes, cables, conduits and other services that pass through the membrane, helping reduce the risk of water movement around the interrupted area.
-
Protrusion And Obstacle Sealing: Used around structural protrusions, awkward shapes and obstacles where the membrane has to be cut or formed, helping close the created joints and maintain waterproofing continuity.
-
Basement And Cellar Waterproofing: Suitable for Newton CDM waterproofing systems used in basements, cellars, retaining walls and below-ground rooms where membrane joints and junctions require careful sealing.
Q) What is Newton CDM Overtape used for?
A) Newton CDM Overtape is used to create watertight seals within Newton CDM Waterproof Membrane System installations, particularly where membrane sheets are joined, overlapped, cut or shaped around details. It is commonly used at wall-to-floor junctions, internal corners, membrane overlaps, butted joints, service penetrations, pipe entries, cable routes and other vulnerable waterproofing points. In basement waterproofing and cavity drain membrane systems, these areas can become weak points if they are not sealed correctly. Newton CDM Overtape links adjoining membrane surfaces together, helping maintain continuity of the waterproof layer and reducing the risk of water movement through joints, edges or penetrations in the membrane system.
Q) How does Newton CDM Overtape work?
A) Newton CDM Overtape works by bonding over interrupted or vulnerable membrane areas to form a continuous butyl waterproof seal. The tape is manufactured from a durable butyl rubber compound, giving it strong adhesion, flexibility and resistance to water, air and chemical exposure. When applied to clean, dry membrane surfaces and pressed firmly into place, the self-adhesive face bonds to the membrane and helps seal the joint or junction. Its flexibility allows it to follow membrane profiles, corners, small surface irregularities and shaped details around obstacles. This makes Newton CDM Overtape especially useful where flat cavity drain membrane sheets cannot create a complete sealed detail on their own.
Q) Where should Newton CDM Overtape be used?
A) Newton CDM Overtape should be used wherever Newton cavity drain membranes need additional sealing at joints, changes in direction or interrupted areas. Typical areas include internal corners, wall-to-floor junctions, membrane laps, butted joints, cut edges, service penetrations, pipework, cables, conduits and protrusions. It is particularly useful in basements, cellars, retaining walls and below-ground rooms where cavity drain membrane systems must be detailed carefully to manage water ingress. The tape should be selected as part of the overall Newton CDM Waterproof Membrane System, rather than used as a standalone waterproofing solution. Correct membrane layout, fixing, drainage and detailing are still essential for reliable long-term performance.
Q) What sizes of Newton CDM Overtape are available?
A) Newton CDM Overtape is supplied in two practical roll widths: 100mm x 20m and 150mm x 20m. The 100mm version is suitable for general membrane jointing, lap sealing, overlap sealing and smaller localised details where a standard-width butyl seal is sufficient. The 150mm version provides wider coverage for more demanding areas, such as wall-to-floor junctions, internal corners and larger membrane transitions. Choosing the correct width depends on the detail being sealed, the size of the overlap and how much contact area is needed on each membrane surface. For high-risk or more complex waterproofing details, the wider 150mm tape is often the more robust option.
Q) How do you apply Newton CDM Overtape at a wall-to-floor junction?
A) At a wall-to-floor junction, Newton CDM Overtape is normally folded along its length so the crease can be set tightly into the internal wall/floor angle. The backing paper is then removed gradually, and the self-adhesive butyl face is pressed firmly onto both the wall membrane and floor membrane. This links the vertical and horizontal membranes into one sealed waterproof detail. The membrane surfaces should be clean and dry before application, and a heat gun is often used carefully to dry the surface and assist bonding. Firm pressure should be applied across the full tape width, avoiding air pockets, loose edges or unsupported bridging at the junction.
Q) Can Newton CDM Overtape be used around pipes and service penetrations?
A) Yes, Newton CDM Overtape can be used around pipes, cables, conduits and other service penetrations where the membrane has been interrupted. These details need careful sealing because any cut through the membrane can create a potential route for water movement if it is not properly protected. The tape can be dressed around the service entry and bonded onto the surrounding membrane to help reconnect the interrupted area into the waterproof layer. Careful shaping and firm pressure are important, especially around irregular protrusions. The surface must be dry, clean and stable before application, and the tape should be applied with full contact and no loose edges.
Q) Can Newton CDM Overtape be plastered or rendered over?
A) Newton CDM Overtape is not designed to provide a direct plaster or render key. Its purpose is to create a watertight butyl seal across membrane joints, corners and detailing points, not to provide a textured surface for finishing materials to bond to. If a sealed joint needs to receive plaster, render or another compatible finish, Newton Mesh Tape should either be used instead where appropriate, or applied over the Newton CDM Overtape to provide a suitable key. This is an important distinction because plaster or render may not bond reliably to a smooth butyl surface. Using the correct finishing detail helps protect both the waterproof seal and the final wall finish.
Q) What are the main limitations of Newton CDM Overtape?
A) Newton CDM Overtape should not be used as a replacement for correct Newton CDM system design, proper membrane installation or suitable drainage provision. It is a detailing tape for joints, corners, overlaps, cut edges and penetrations, not a complete waterproofing system by itself. It must be applied to clean, dry membrane surfaces, as dust, moisture, grease or loose debris can reduce adhesion and weaken the seal. The tape should not be stretched excessively, applied loosely, folded badly or left bridging unsupported gaps. It also does not provide a plasterable surface on its own, so Newton Mesh Tape is required where a plaster or render key is needed over the sealed area.
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