When to use a polythene DPM instead of an epoxy DPM
Waiting for a sub-floor to dry can push a project timescale out and create impatient clients. However, you have options to speed the process along and allow early installation of floor finishes, but which is the best for your project?
Epoxy damp proof membrane systems have been used for many years and it is often the go-to solution for installers. It is tried, tested and reliable, offering an effective seal over cement floors which contain high levels of residual moisture (up to 98% RH), allowing early installation of vinyl, carpets and resin coatings, without the conventional 'drying out' periods of cement being observed. But why would you choose an epoxy solution over a polythene membrane?
Heavy duty: By using an epoxy DPM system, you create a bonded floor offering a specification suitable for heavy-duty industrial installation.
Thin: An epoxy DPM system covered with a thin topping screed such as fast drying weberfloor smooth rapid 4160enables the specification to go down as low as 2mm thick.
By using a 1200 gauge damp proof membrane such as Visqueen over your subfloor before applying 20mm of suitable screed such as rapid drying weberfloor fibre rapid 4320, it will allow you to confidently create a solid, level and dry substrate for your floor covering. But what else can the use of a DPM sheet offer?
Cost: The price of a polythene DPM sheet over the price of an epoxy DPM system is considerably lower and the labour cost will also be dramatically reduced.
Time:Most standard epoxy DPMs take 8 hours to cure, with a DPM sheet you can lay-and-play the same day!
Preparation: Within reason if the DPM sheet is level over the sub-floor, no mechanical preparation would be needed, the cost and time to diamond grind, spin off or shot blast a floor before an epoxy DPM would be negated.
VOC content: Many of the main contractors are trying to eliminate high VOC products on site due to H&S, using a DPM sheet will remove any additional risks.
Disposal:Epoxy DPM needs specialist disposal, if is not skipped correctly (made inert) there could be extra costs involved.
Allergies: Surprisingly many people have allergic reactions to epoxy resins whilst the DPM sheet has no hazard to exposure.
Second thoughts: By using a DPM sheet you are creating an unbonded floor allowing the option to remove at a later stage
At Weber, we offer an epoxy weberfloor DPM system, but can also supply a range of suitable screeds which can be applied over a DPM sheet such as Visqueen for a fast, efficient and high performance solution.
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We provide specialist technical support for both specifiers and contractors, and on site Weber’s applications team is available to assist with more unusual projects or help those who are new to the products get to grips with the range and the process.