We were planning to put a raised roof deck on our flat roof to run level with our walk on roof windows. We hadn't really paid that much attention to the flat roof finish, whether it was felt, GRP or rubber.
We now need to decide, what would you recommend as the best surface for a raised deck (like in the images attached)?
It will need to support the legs that the decking boards will sit on and allow the water that drains below to easily run off.
Thank you everyone, without doubt it seems like our current set up is going to be a huge problem.
So I am going to be making some changes. My current builders are good, the previous guys made a mess of the levels which has caused us the issues with the levels.
I have attached some images showing what was going to be the set up and what I think my options are with this.
The image shows one of the doorways going out onto the roof, there is still a block to go on that steel, but we don't have a lot of room for the build up.
ORIGINAL PLAN definitely been scrapped.
PLAN A This would be the least disruptive (if you guys think it will work as it changes nothing on the roof above)
I have been advised that if I have insulation below the OSB that there will be air gaps and voids where you can get condensation. If I were to get spray foam insulation (closed cell) which will effectively fill in any air gaps leaving nowhere for condensation to form?
PLAN B. As a couple of people suggested, I shouldn't have more insulation below than I have above. Therefore if I add on some insulation above and then an equal or slightly lesser amount below would this work. The only issue I have is the walk on roof glass not sitting flush with the decking, which would be a possible trip hazard and aesthetically wouldn't look very good. Considering the cost of the glass its going to be a shame if we can't finish flush as we wanted.
And one delayed update:
Demolition + Removal + Groundworks: 20,000
Digging a massive hole for the basement: 10,000
25m2 basement + 130m2 foundation to 'cover' the entire house footprint: 100,000
To be clear, the above is under the assumption that the soil is 'solid', No unexpected water, or sagging, or unexploded WWII bombs. Yes we'll have to do some investigations.
My question is:
How much more is this cost (130,0000) than if I were to just clear, groundwork, foundation?
I'm trying to separate out the GBP/m2 of the basement
Do they get fed from cold mains or from cold water storage in the Attic? Which was common for cold water taps and toilets. Where it wasn't really potable water. Kitchen is always off mains.
A small mesh filter will block fast if its that bad. I'd whip the feed pipe off before the toilet and let it run into a bucket to see whats going on. Its maybe a single bit stuck at the isolating valve breaking down.