Plastering
The removal of contaminated wall plaster is a necessary step when carrying out damp proofing works. By removing the contaminated plaster, any surrounding or new plaster will not be affected.
Depending on what damp proofing works have been undertaken, will determine what plastering works will be required.
1
Standard Plastering (No membranes used)
To eliminate the hygroscopic action of salts within the old original wall plaster, all treated walls must be replastered to a minimum height of 1 metre.
Where a sand/cement/additive render is being used ideally this work should be deferred as long as possible to encourage drying out but a minimum of 14 days between treatment and replastering should be allowed if possible.
2
Plastering over Vertical Membranes
To eliminate the hygroscopic action of salts within the old original wall plaster all treated walls must be replastered to a minimum height of 1 metre.
Where a sand/cement/additive render is being used ideally this work should be deferred as long as possible to encourage drying out but a minimum of 14 days between treatment and replastering should be allowed if possible.
Where replastering is carried out over our vertical membrane system, these areas must be replastered using Anti Sulphate Cement and clean washed sharp sand. Just prior to replastering, it will be necessary to apply a bonding agent to enable good adhesion.
To the salt treatment areas, the first scratch coat of plaster must be applied to the wall 24-48 hours after the application of the anti-salt and SBR otherwise loss of adhesion may occur.
3
Plastering over Cavity Drain Membrane Systems
You can either dot and dab plasterboard followed by a skim finish or apply two separate render coats followed by a skim finish.
If you apply the two separate render coats, there should be at least a 5-day gap between each coat to allow for drying.
If you apply plasterboard, we can apply our membrane system strategically to allow for the plugs to be lined up correctly for where the plasterboard needs to be drilled. You are able to baton and board, and we would be able to align our plugs accordingly.
4
Plastering over ISO-Therm
Scrim tape (or fibreglass mesh tape) is to be applied over the joins in the ISO-Therm. This will prevent cracks in the finished plaster.
Only one plaster skim is required and this can be applied directly onto the ISO-Therm to create a wall finish.
No glue or plastering adhesives are required when skimming over the membrane.
