It is not unheard of for builders to nominate lightweight construction for fire stairs walls, essentially steel studs with two layers of fire rated plasterboard on each side. In a D&C contract, the builder often dictates the building systems they wish to work with. What is the reasonable service life of a building anyway? 30 years? 40 years? Keep in mind that the average mortgage is already 30 years If it does fail for whatever reason, it’s pretty much impossible or financially unfeasible to fix due to the complexity and cost. Is it going to last a reasonable lifespan of an apartment building? It’s hard to say, but liquid membranes generally don’t have warranties comparable to a reasonable lifespan of the building. Is it compliant? Yes? Maybe? I’m not even sure at this point but it’ll pass the flood test at that point in time. This is much cheaper to build compared to the other methods but pretty much relies solely on the liquid membrane for waterproofing.
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The joint is then protected with a liquid membrane. However it is almost industry standard for hobs to be cast afterwards, which creates a cold joint between the hob and the slab which is not waterproof. The hob can be waterproofed over as additional safety if needed. But if a hob or bund must be used, the best practice is for the hob to be cast integrally with the slab so it is stronger and does not have any joints. It’s fairly well known to experienced practitioners that waterproofing of external balconies in apartments is best achieved with an adequate structural setdown at the threshold. At the moment, through the practice of D&C contracts, design compliance of building systems are often broken down to individual components and distributed amongst multiple trades at the discretion of the builder. However, what it means to declare compliance needs to be defined and kept to a consistent standard. Non-BCA compliance related documentation such as joinery details, finishes setouts, paint colour set outs etc, basically anything inconsequential to compliance should not require declaration. These would commonly be general arrangement plans, various construction setout plans, details for fire safety, waterproofing etc.
Submission of as built drawing code#