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PermaSEAL 3 Mesh Membrane 20m²

£112.00 Ex VAT
£134.40 Inc VAT

A high quality 3mm mesh membrane designed for damp proofing walls above ground. The mesh provides an excellent key for dot and dab plaster board or direct rendering. 

3mm Damp Proof Mesh Membrane - 20m²

PermaSEAL 3 Mesh Membrane is a high quality meshed membrane, designed for damp proofing walls internally above ground. Once the underlying damp issue is resolved, it creates a physical barrier to prevent further damage and salt contamination. The mesh provides an excellent key for a range of finishes.    

Mesh Membrane for Damp Walls

PermaSEAL 3 is the ideal mesh membrane for damp walls. It is specifically designed to be applied to damp walls to isolate them from new finishes. PermaSEAL wall mesh membranes are impervious to moisture and moisture vapour. This means they create a barrier between the old surface and your new finish. This effectively isolates damp walls and prevents any new salt deposits on the surface plaster and damage to decoration.  

Salt Contaminated Walls and Damp Proofing

PermaSEAL 3 Mesh membrane is the ideal product for isolating salt contaminated surfaces. These surfaces can often appear damp in periods of high humidity. The hygroscopic salts that are contained in the surface attract the damp in the air to the surface giving the appearance of a darker, damp patch. This is often misdiagnosed as penetrating or rising damp. The membrane simply isolates the background contaminated substrate from the new finish alleviating any signs of damp.

Uses of PermaSEAL 3 Mesh Membrane

  • Damp proof mesh membrane above the ground internally
  • Isolation membrane for salt contaminated surfaces

If you are suffering from high salt tides, we stock a 1.2 metre mesh membrane.

Benefits of PermaSEAL 3 Mesh

The PermaSEAL 3 is highly resistant to water, alkalis, and saline solutions, and is guaranteed against deterioration for 30 years. It also provides the following key benefits:

3mm Stud Profile

Having a 3mm stud means that PermaSEAL 3 mesh damp proofing membrane only has an overall thickness of 3.5mm. This makes it the preferred meshed membrane when space is at a premium.

Meshed Surface

PermaSEAL 3 Mesh has an integrated high quality meshed surface which provides an excellent key for lime mortars, renders, plasters or dabbed plasterboard. 

Installing a mesh membrane

The mesh membrane installation is straightforward. Once the underlying damp issue has been resolved, you can simply apply the mesh membrane to the wall in the following way: 

  1. Clean the substrate to obtain as flat a surface as possible. Remove any damaged, loose or crumbling plaster.
  2. Cut the membrane to size with a sharp knife or scissors.
  3. Fix the 3mm membrane (with the mesh facing outward) to the surface with plugs. It can be fitted horizontally or vertically.

Jointing - The 3mm mesh membrane can be easily bent around corners as it is a very flexible material. Alternatively, it can be butt jointed and sealed with PermaSEAL Fleece Overstrip

Finishing - Plasterboard panels can be fixed to the membrane by the dot and dab method (minimum of 50% board coverage with the dab adhesive), giving a dry surface ready for immediate decoration.

For more information on all aspects of installation including jointing and finishing, which plaster to apply and how to avoid bridging view the Download tab.

PermaSEAL - Complete Solutions. Made Possible.

Our PermaSEAL mesh membranes provide a solution to your damp proofing needs. If you have any questions around installing mesh membranes or damp proofing in general our experts are on hand to provide free advice. Simply call us on 0117 982 3282. 


Browse our damp proofing membranes or read our guide to internal damp proofing


  • High quality mesh damp proofing membrane
  • Ideal for internal damp proofing
  • Ideal when space is a premium
  • Provides an excellent key
  • Life expectancy of at least 50 years
  • High compressive loading stability
  • Highly resistant to water, alkalis, saline solutions and organic minerals
  • Resistant to bacteria, fungi and other small organisms.
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