23/07/2026
CASTOR BAY DECK PROJECT
With the membrane of three internal decks nearing the end of their shelf life, our client needed to act.
With some thought around the various options and how they use these outdoor spaces, it was decided rather than lifting the existing tiles to replace the membrane, they would:
REMOVE TWO DECKS
The bedroom decks were never used, so it made sense to eliminate these all together.
With the master suite, they were able to capitalise on their stunning sea view, creating a picture frame window.
REBUILD THE MAIN DECK
The lower floor deck was completely rebuilt as a detached (instead of internal which can invite moisture in) kwila deck, making the most of the living space and coastal outlook.
Keeping within the same footprint, we were able to reuse the existing glass balustrades, which was a major cost saver.
These solutions gave the client the opportunity to modernise their home by updating the design and joinery, but most importantly, it removed a high risk building element.
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WHAT IS THE PURPOSE OF A MEMBRANE?
It creates a waterproof barrier that protects your home's structural timber and the building envelope from moisture damage, rotting, and leaks.
So it goes without saying, that an expired membrane becomes a high-risk financial and structural liability.
Case being - hidden water ingress can rot your structural framing long before you realise there's a problem. Water rarely drips straight down, rather it travels along joists and structural framing, so by the time you actually notice a leak or a stain on a downstairs ceiling, extensive internal damage has already been done.
Trapped moisture also creates the perfect breeding ground for toxic mold inside wall cavities.
As smart homeowners, our client planned ahead, acting well before the membrane was ever compromised.
If you have internal decks you are concerned about, get in touch and we can chat through your options and next steps.
If you want to learn more about our deck building and restoration, visit our website - https://cainbuilt.nz/outdoor-living/deck-builder/