RonaScreed DPM – Liquid damp proof membrane
RonaScreed DPM – Liquid damp proof membrane. Designed to reduce the passage of water vapour and allow the adhesion of thin bonded and fast drying screeds to concrete which is either not fully dry or does not have a functioning DPM. RonaScreed DPM is also suitable for use prior to the application of tiles, soft flooring or wood flooring to screeds which are not fully dry.
Supplied as a liquid and a powder RonaScreed DPM is applied as a two or three coat membrane. Tests including Moisture Vapour Permeability in accordance with BS3177 have been carried out and show a reduction in vapour transmission to less than 4g/m²/ day.
- Water based membrane system
- Reduces water and water vapour permeability
- Designed to accept thin bonded screeds
- Compatible with most Ronacrete screed and topping systems
- Easy to mix and apply
- Quick drying two or three coat application
- Non-hazardous, solvent free, low odour
- Suitable for use prior to the application of tiles, soft flooring or wood flooring to screeds which are not fully dry
Using RonaScreed DPM – Liquid damp proof membrane
In all cases the substrate must be sound and have sufficient tensile strength to sustain an adequate bond with the RonaScreed DPM, to prevent debonding caused by vapour pressure and in the case of overlaying with high strength screeds, topping or finishes, to prevent disruption of the substrate during curing or subsequent trafficking
When mechanically abrading surfaces, vacuum blasting is preferable. A heavy surface profile should be avoided in order to minimise the risk of the RonaScreed DPM ponding or not covering high points.
When overlaying with an unbonded screed, surface preparation requires the substrate to be clean, sound and free of contamination including oil and dirt.
If an unbonded screed is being laid on top of RonaScreed DPM, install a separating layer between the RonaScreed DPM and screed to prevent partial adhesion.
Following surface preparation and before applying RonaScreed DPM the surface must be damped with clean water, allowing water to soak in to the surface and reduce porosity. Excess standing and ponding water must be removed and the surface left damp.
Application of RonaScreed DPM – Liquid damp proof membrane
Ensure the RonaScreed DPM is properly mixed and the powder evenly dispersed. Apply by brush or roller on to the damp surface at a minimum coverage rate of 0.7kg per m2 per coat, this coverage rate takes no account of substrate texture or profile, usage will be greater on textured or uneven substrates. It is essential to ensure even coverage and to achieve a continuous pinhole free film. Do not overspread the material.
Apply the second (and third coats) as above. Allow the previous coat to dry for not less than 1 hour and not more than 24 hours before applying the second coat. The second coat is applied at 90o to the first. Do not damp between coats. If covering with a bonded screed, or if other finishes are to be applied more than 24 hours after application of the second coat, a third coat must be applied within 24 hours of the application of the second coat.
Blind the third coat with kiln dried sand to provide a key. The membrane must be protected at all times against site traffic until it is covered. Applying Ronacrete bonded screed Note that when applying a thin bonded screed (eg. Ronafix or RonaScreed) a primer coat of Ronafix & cement or other Ronacrete primer compatible with the screed or topping, must be applied directly on to the dry RonaScreed DPM, before the screed or topping is laid.
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