56 EXTERNAL ENVELOPE
and immediate drainage of water. This means the water cannot enter the screed and cause issues such as freeze/thaw damage, staining, cracking and efflorescence. Widely used on the continent, the drainage mat and drainage screed system has even become standard in Germany since 2002, being incorporated into the standards for external floor coverings of the German Construction Industry Association (ZDB).
With the right construction, useable outdoor spaces can be created for year- round enjoyment
Height/weight restrictions When working at height, there are often weight loading and height build-up issues – this is particularly problematic when trying to create threshold-free junctions for a seamless inside-outside look. This can be overcome with an epoxy resin-bonded screed system or with a point-fixed system. When used in combination with a drainage mat, the epoxy drainage mortar system can be used for various tile types and thicknesses. Strong and lightweight, build-up can be achieved from only 43 mm for low height constructions. It is ‘capillary- passive,’ meaning the water travels down through the screed system and is transported to the drip/drain profiles and guttering via a drainage mat.
Primarily used for low construction
heights, and areas with reduced clearances, the direct point adhesion system is up to 80 per cent lighter than conventional assemblies. Complete build-up can be achieved from 29 mm (when using a 20 mm slab and 8 mm drainage mat) – saving 70 per cent of the overall construction height. The assembly ensures rapid-drainage for
barrier-free/low door connections using low-height drain grates. To achieve a seamless inside-outside construction it is important to specify the right drain grates and drip/drain edge profiles – without them water can seep over balcony edges causing unseemly discolouration and potential metal erosion of balustrades.
Consider specifying drain grates that are height adjustable and flexible with integral dirt traps – this means that water is free flowing through the drain grate and drainage. Ensure that they are standard compliant for door threshold heights from 150 mm to 50 mm. Drain grates are also essential at balcony junctions as they help prevent backflow into properties.
Stuart Ross is technical service supervisor at BAL
WWW.ARCHITECTSDATAFILE.CO.UK
ADF JULY 2018
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