Newton Newtonite Mesh Plugs

Q) What are Newton Newtonite Mesh Plugs and what are they designed for?

A) Newton Newtonite Mesh Plugs (Newton product reference A16) are specialist fixing plugs designed for securing Newtonite Lath Mesh Membrane to internal masonry walls within the Newtonite Damp Proofing System. The current blue plug design replaces the older brown version and is approximately 10mm longer, providing improved fixing stability and enhanced performance. Installed through the meshed damp proofing membrane using a 7mm SDS drilled hole, the plug anchors the membrane securely against the substrate before plaster, render or dot and dab plasterboard finishes are applied. For direct plastering or rendering, 16 plugs per m² should be used. For dot and dab plasterboard, 10 plugs per m² is normally sufficient to hold the membrane correctly in position.

Q) What is the difference between the blue and brown Newtonite Mesh Plugs?

A) The blue Newtonite Mesh Plug is the current product specification and replaces the older brown version, which is now superseded. The updated blue plug is approximately 10mm longer than the former brown design, providing improved fixing stability and a stronger mechanical hold when correctly installed into suitable wall substrates. This additional length helps the plug achieve better anchorage in masonry, which is particularly important when the membrane must be held firmly in position before plastering, rendering or dry-lining work begins. Any existing stock of brown Newtonite Mesh Plug should be treated as the older generation product. When specifying or ordering Newton Newtonite Mesh Plugs for Newtonite Damp Proofing System installations, the current blue plug is the correct version to use.

Q) Where can Newtonite Mesh Plugs be used in damp proofing work?

A) Newtonite Mesh Plugs are designed for internal above-ground damp proofing applications within the Newton Newtonite Damp Proofing System. Their primary use is fixing Newtonite Lath Mesh Membrane to masonry walls before direct plastering, rendering or dot and dab plasterboard installation. They are well suited to older properties where internal walls are affected by residual moisture, hygroscopic salts or general dampness, and where a membrane-based remedial finish is required. Typical uses include direct plastering and rendering over membrane, dot and dab plasterboard finishes, damp wall refurbishment, salt-contaminated masonry wall treatment, higher risk damp areas with Newtonite 801 Mastic sealing, and general renovation and property maintenance work involving Newtonite meshed membranes in domestic and commercial properties.

Q) When should Newtonite Mesh Plugs be used with Newtonite 801 Mastic?

A) Newtonite Mesh Plugs should be used with Newtonite 801 Mastic in higher risk or more demanding damp wall situations where additional protection around fixing penetrations is required. The mastic is applied to the inside of the plug head before the plug is fixed through the membrane into the wall, creating a damp proof seal around the plug head. This is particularly useful where the wall is subject to significant moisture, hygroscopic salt activity or residual damp that could potentially track through the fixing point. In standard above-ground damp proofing with lower risk conditions, the plugs can be installed without mastic sealing, but specifying mastic for the plug heads provides a more robust detail in challenging or high-moisture environments.

Q) What are the main advantages of Newtonite Mesh Plugs?

A) Newtonite Mesh Plugs offer several practical advantages for Newtonite membrane installations. They are specifically manufactured for securing Newtonite Lath Mesh Membrane, making them far more suitable than general-purpose plugs for this application. The current blue plug is approximately 10mm longer than the previous version, improving fixing stability and mechanical hold. When installed at the correct density, they hold the membrane firmly against the wall, preventing sagging, drumming or movement before finishing work begins. They are suitable for both direct plaster and render systems at 16 plugs per m², and for dot and dab plasterboard at 10 plugs per m². They are also compatible with Newtonite 801 Mastic sealing for higher risk conditions, providing a damp proof seal around each fixing point.

Q) How are Newtonite Mesh Plugs installed correctly?

A) Newtonite Mesh Plugs are installed using a 7mm SDS drill bit to create a clean, accurate fixing hole through the Newtonite Lath Mesh Membrane and into the masonry substrate. The membrane should be correctly positioned, levelled and aligned on the wall before drilling begins. The plug is then inserted through the membrane and driven into position to anchor it firmly against the wall. Where Newtonite 801 Mastic sealing is required, the mastic should be applied to the inside of the plug head before the plug is inserted, so that it compresses and seals around the fixing point as the plug is driven home. After installation, check each plug is secure, fully seated and holding the membrane evenly and tightly against the wall surface.

Q) What fixing density is recommended for Newtonite Mesh Plugs?

A) The recommended fixing density for Newtonite Mesh Plugs depends on the type of internal finish being applied over the Newtonite Lath Mesh Membrane. For direct plastering or rendering, 16 Newtonite Mesh Plugs per m² should be used to provide the close fixing pattern required to support the applied finish and prevent membrane movement. For dot and dab plasterboard installations, 10 plugs per m² is normally sufficient, as this finishing method imposes different support and fixing requirements compared with a wet plaster or render system. Correct plug spacing is genuinely important in both cases, as insufficient fixings can allow the membrane to sag, drum or move before and during the application of the wall finish.

Q) Why is it important to use the correct fixing density for Newtonite Mesh Plugs?

A) Using the correct fixing density for Newtonite Mesh Plugs is critical because the membrane must be held firmly and evenly against the wall before any plaster, render or dry-lining finish is applied. If too few plugs are used, the Newtonite Lath Mesh Membrane can sag between fixing points, drum when tapped, or move during the application of wet finishes. This can result in an uneven background, poor adhesion of the plaster or render, and a finish that may crack or fail in service. The fixing density also affects how well the membrane performs its damp separating function, as a membrane that is not tight to the wall may allow bridging of moisture between the masonry and the new finish.

Q) What is the role of Newtonite Lath Mesh Membrane in the system?

A) Newtonite Lath Mesh Membrane is a BBA Approved meshed damp proof membrane that forms the core of Newton’s Newtonite Damp Proofing System. Its primary role is to create a physical moisture-resistant separating layer between damp or salt-contaminated masonry and the new internal finish. Rather than attempting to stop water within the wall, the membrane provides a managed separation that prevents residual moisture and hygroscopic salts from reaching and damaging the new plaster, render or dry-lining. The mesh face provides a suitable key for direct plaster, render or compatible finishing systems. Newtonite Mesh Plugs are essential to this system because they hold the membrane tight and evenly against the wall, ensuring the separation layer performs correctly throughout the life of the installation.

Q) What substrates are Newtonite Mesh Plugs suitable for?

A) Newtonite Mesh Plugs are designed for fixing Newtonite Lath Mesh Membrane to internal masonry walls that are sound enough to accept a 7mm SDS drilled fixing. Suitable substrates include brick, stone, blockwork and concrete walls commonly found in older and traditionally constructed domestic and commercial properties. The masonry should be stable and capable of holding the plug securely. Where walls are loose, crumbling or severely deteriorated, localised repairs should be carried out before membrane installation begins to ensure the fixings can achieve adequate hold. In higher risk or more damp masonry situations, the plugs should be used with Newtonite 801 Mastic to seal around the plug head and improve the damp proofing detail at each fixing penetration.

Q) Are there practical tips for getting the best results when installing Newtonite Mesh Plugs?

A) For the best results when installing Newtonite Mesh Plugs, ensure the Newtonite Lath Mesh Membrane is correctly positioned and aligned on the wall before drilling begins. Use a 7mm SDS drill bit to form clean, straight holes through the membrane and into the masonry, avoiding tearing or enlarging the membrane around each fixing point. Apply the correct fixing density from the outset, using 16 plugs per m² for direct plaster or render systems and 10 plugs per m² for dot and dab plasterboard. Where higher risk damp conditions are present, apply Newtonite 801 Mastic to the plug head before installation. After fixing, check each plug is fully seated and the membrane is held tightly and evenly across the full wall area before finishing begins.

Q) What are the limitations of Newtonite Mesh Plugs?

A) Newtonite Mesh Plugs have several important limitations to be aware of. They are specifically designed for securing Newtonite Lath Mesh Membrane within the Newton Newtonite Damp Proofing System and are not suitable for general-purpose fixing applications. The current specification is the blue plug, and the older brown version should no longer be used in new installations. The plugs rely on a sound masonry substrate to achieve adequate mechanical hold, so loose, crumbling or severely deteriorated walls must be repaired before installation. Insufficient fixing density, incorrect drill hole size or plugs that are not fully seated can all compromise membrane performance. In high-risk damp conditions, Newtonite 801 Mastic should be used with the plug heads to provide adequate sealing around each fixing penetration.