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RIBA-APPROVED CPD ON ROOFING MEMBRANES BY DON & LOW
Don & Low has launched a new RIBA-approved CPD exploring the role of roofi ng membranes in protecting buildings and enhancing performance. The session covers vapour permeable, impermeable, and air & vapour permeable membranes, along with VCLs, condensation risks, ventilation strategies, and best-practice moisture management. As the UK’s
only manufacturer of construction membranes, Don & Low provides the full range of roofi ng underlays, backed by independent certifi cation.
www.ribacpd.com/cpd/detail/construction-membranes-roofing/ vKLM5fgPHM97GudCUHzoDh
UNLOCK SMARTER DESIGN: AET FLEXIBLE SPACE CPD SEMINARS
Discover how AET’s underfl oor air conditioning (UfAC) is transforming modern building design. AET’s RIBA-accredited CPD sessions are tailored for architects, offering insights into sustainable, space-saving, and fl exible alternatives to traditional ceiling-based HVAC solutions. Learn
how UfAC reduces embodied carbon, unlocks design freedom, and adapts seamlessly to CAT-B reconfi gurations. Delivered as a 45-minute “Lunch & Learn” at your offi ce, each seminar includes expert guidance, a CPD certifi cate, and a takeaway handout. Book your session today.
01342 310400 sales@fl
exiblespace.com
NEWS FEATURE
Getting it right when tanking a wetroom
Nick Bratt, national technical sales manager for tile adhesive
manufacturer Palace Chemicals, outlines the importance of the correct use of materials and good practice, as defi ned in the relevant British Standards, when it comes to tanking a bathroom or wetroom.
W
ith the continuing growth in popularity of wetrooms, we are seeing a corresponding increase in incidents where the installation has not been satisfactory, and often this is caused by water or moisture getting into the substrate behind the tiles. These issues are very diffi cult to solve post-installation but can be easily prevented at the design stage by following the guidance contained within the British Standard relating to tiling.
HEAT RECOVERY VENTILATION FOR COMMERCIAL APPLICATIONS Leading
British ventilation manufacturer Vent-
Axia is excited to announce the launch of its latest CIBSE-approved CPD course ‘Introduction to Heat Recovery Ventilation’. Designed to give attendees a way to enhance their professional knowledge and career opportunities, the course provides a greater
understanding of heat recovery ventilation, how it works, why it works, and its benefi ts for commercial applications. This new CPD complements Vent-Axia’s existing course on ‘Legislation for Commercial Ventilation’, providing delegates with valuable knowledge on ventilation compliance.
cpd@vent-axia.com
www.vent-axia.com LATEST NEWS, VIEWS AND MORE
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BS 5385-1 2018 states that for all new or refurbished properties, a proprietary tanking system should be used. BS 5385-3, concerning fl oor tiling, was updated in 2024. One of the key amendments is for direct tiling on to plywood and other wood-based sheets or boards, an intermediate layer, such as an uncoupling membrane, reinforced tanking system or tile backer board should be used, providing the plywood is rigid and stable enough to carry the expected in service load. The new standard also states that timber is not recommended as a suitable substrate for fl oor tiling in wet, frequently damp, or high humidity areas. For wetroom fl oors, they should be laid to falls with gradients of between 180° and 135° to ensure that the water fl ows towards the drain, taking note that a gradient any greater than 135° is unsuitable and possibly dangerous. This requirement impacts on the design of wetrooms in particular since they are subject to repeated and persistent wetting, and a suitable proprietary tanking system should be used prior to tiling. This should be laid continuously around upstands and points where services pass through the fl oor, to create a seamless seal, so that there is no risk of water leaking through to the substrate. If using other intermediate substrates, such as moisture resistant
boards, the manufacturer’s technical data and/or the manufacturer itself should always be consulted, as these would usually state that a tanking system should be used. The recent updated release from NHBC has sparked some controversy due to the wording around fl ow rates of a shower and moisture resistant boards, as these contravene the British Standards guidance for tanking.
For walls which surround a bath where a shower is not fi tted then the substrate should be suitable for the application and moisture resistant. It is important to recognise that water resistant adhesives and grouts are designed to allow water to pass through them without them breaking down, hence ‘water resistant’, but are not a substitute for a waterproof tanking system, as clearly stated in BS 5385 Part 4. If in doubt, tank it out! That way, any and every project that has wet, frequently damp, or high humidity areas will always have the added insurance policy that there will not be any leaks!
Supplied by Nick Bratt, national technical sales manager for Palace Chemicals
WWW.ARCHITECTSDATAFILE.CO.UK ADF SEPTEMBER 2025
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