Hi Debra, I see you are trying to waterproof under the top deck and improve the area below for outdoor living and connection to your proposed pool. The problem is with timber upper deck and waterproofing is that to do the job properly will be what jbantick said. Even if you added a waterproof layer it will still collect not only water but dust & debris through the decking. The FC sheet eliminates this but will need tiling to look any good up there. The rain ingress from the side will also need to be addressed. Have you had a professional look at it and advise on method & the cost involved? It might be more cost effective to leave the under deck area as a transition to a separate pool pavilion if you have the room.

just had a look at your existing plans for the second storey.. 1/ I'd make it all open plan .. First I'd move your bed 4 downstairs into the theatre room..reason ? bathroom is existing down there..you can turn it into a master suite..bathroom..study as retreat. which then leave you all that room ..bed 4 ..kitchen ..meals..lounge..foyer to just be one huge living area.. from that living area you can pop in a stacker door/bi folds to lead to your screen verandah. Personally I'd get rid of the screens and open it right up with banisters so you can have fresh air flowing in. You can do the same with the front as well to make it one huge area without much changes.

Thanks siriuskey for your suggestions. I don't really know what style my taste/style of house is really. I like the simplicity of mid century furniture and have a mid century Parker sideboard. Other than that, the house is a bit of a blank canvas at the moment. (the kitchen is fairly modern though with almost white glass splash back, white cupboards, and stone bench tops that are in a colour like Caesarstone Osprey (but are essastone). I do like things from the late 1950's/1960's.....and I like Audrey Hepburn. I also like the Parisian type black n white art from that era. (but I also like naive art - big colour artworks of people or animals that look like they have almost been painted by a child). If I had the money I would buy a high ceiling mid-century home like they have in USA (a modern yet mid-century Brady Bunch style home). My house is a 1962 chamfer board on concrete posts and batterns around the bottom and currently just has satin polished mixed hardwood timber floors throughout. Most of the walls are either natural white as in the study or snowy mountain quarter strength (and in smallest bedroom - half strength russian toffee). Because I am always scared that things will date if they follow trends too much, I always seem to do fairly conservative or timeless things in house renovations and rely on the furniture and accessories to add colour and style. (I like the idea of renovations and the ripping out of old stuff to create something new, but I really don't like have to make all the creative decisions etc along the way)......so I do appreciate it when I get advice from others. I have printed your suggestions and will have a look at them. (I guess the barn door look is actually similar in concept to some of the timber veneer sliding doors seen in midcentury homes). Thanks again.

We have a really unique wood look product which is non porous and has the highest anti-slip rating of any decking on the market (that includes hardwoods and WPC), so it's ideal for wet areas, such as swimming pools; https://www.forteflooring.co.nz/product/catalogue/millboard-decking https://www.millboard.co.uk/ It's more stable than plastic composites, doesn't fade as much as them, is more realistic, last longer, more stable against the UV, the lighter colours don't heat up as hot as WPC decking. Send email if you would like some samples, and to discuss further: carlo@forteflooring.co.nz 0212284018 Cheers Carlo