SteamyTea

Some say that water divining works. Now here is a real test.

Could you get the underside/inside sprayed with PU foam, then put in a VCL if needed. Then you can pour a secondary reinforced slab onto the existing one. Seems to me that the GRP/EDPM is just there to protect the insulation/chipboard.

Is it something like this?

The way I see it then is that the GRP is just waterproofing. So can be put directly onto the insulation. If that insulation is glass tissue covered. 3 layers of 450 gm.m2 matt with a flow coat will do that as the strength is in the reinforced concrete pour above it. There will need to be some detailing for the drainage channels, but that would need some more information as to what you want it to look like. With the final reinforced slab being 75mm thick, bolting the balustrade to it may be a problem. Is it possible to have some plates with threaded studs fitted into the correct place (I was a toolmaker, not a builder so working to 1000th of an inch is normal to me). Or you could have plates fitted and then drill and tap after (probably safer). That would need a structural engineers input. At the interface of the drainage channels and the reinforced concrete below it I would fit a pre moulded section. Probably make the interface and the 'gutter' as one, then lay some GRP over it. I am not sure how they would detail with with a rubber sheet, sorry EDPM, but suspect that they would do something similar. What are the overall dimensions? Some consideration may be needed for thermal expansion.

Just had a look at your build up, any change of putting some measurements onto it. I am envisaging a platform to park cars on. The platform is built over something. Is that right? As the GRP is only for waterproofing, it could go onto thinner board, possibly 3mm ply. It is really only to make the lay up easy and stable. I don't think it is there to add anything structural. I can see where the wall is and the drain challenges. It would be usual to have the drainage built into the platform. Is there walls either side of them and that is why are two of them. A 3D sketch may be more useful as I am struggling to understand it. How high up do the skylights stand. As long as there is 100 mm, then bonding to that should not be a problem. Does depend on the radii at the corners. There are ways around that though.

@pocsterI am a bit tied up at the moment, but shall come back and give my thoughts on how to do your layup. Any chance that you can post a picture or sketch up of the two run off areas and any these up stands. It may help clarify what you are trying to do. Basically GRP is easy to put into a corner/edge, harder to put over a corner/edge.

Not for GRP, which stands for Glass Reinforced Plastic, sometimes known as FRP, Fibre Reinforced Plastic. Even been called composite or laminated. I think when we refer to GRP on here, most of us are thinking about a glass fibre matt (not Fibreglass as that is a trade name) which is impregnated with a liquid resin, usually polyester, but may be vinyl ester (better strength and longevity as long as it is out of sunlight) or epoxy resin (more expensive and often harder to do right). There are some newer acrylic resins that are water tolerant, but I would have to investigate them more. There are also polyurethane resins that have some good characteristics, but for roofing, polyester (cheapest and most widely used) or vinyl ester if you need extra strength and are worried about long term submersion in water.

I am half tempted to set up a new business sorting out flat roofs. Only trouble is, I hated running my own business last time, I went quite odd.

As this is going to be a buried barrier, I would GRP it. If there are areas of high load, or point loads, then extra layers can be placed there. One advantage of a buried layer is that there are no UV problems to worry about, so a vinyl ester resin can be used.

Did anyone feel this 4.4 tremor. I didn't, but then I was at the pointy end of Cornwall. Is Clydach an old mining area? Did animals behave oddly, maybe the gerbil spinning around its wheel around its wheel a bit longer.

Post up John Hurt (and I bet it did) and the worm popping out, I like that scene.

Make sure it is well ventilated, there have been deaths caused by incorrectly stored pellets/chippings. Before you go down the biomass route, have you looked at the alternatives. They may be better and cheaper.

How does that compare to reality, is it close?

We prefer that they die, while hidden away on an industrial estate. http://www.bbc.co.uk/programmes/b09r4qdr

And the sheep said 'Baarlooks'

What they should have done is put a picture of the door and windows on the garage door. Then when they council comes around, just laugh at them. Later finish the project off. It is a sad state of affairs when people feel they need to convert a small garage into a house.

That was one of the mistakes that led to the financial crash of 2007/8. Consumers are anything but rational when it comes to discretionary spendings, and self build is all about that sort of spending.

Same applies for boats, they also have rules for wiring, like caravans. There was a lot of DC back then, my Father worked for the local electricity board in High Wycombe. One of his jobs was to change housing from DC to AC. There is so much going for AC that, unless you are off grid, you gain nothing.

DC is great for creating an electrical arc. It is not all about wattage. This has been looked into a lot in the past, and if it is not available, there is a good reason for it. It is too costly and complicated for normal housing.

Ohm's Law As your voltage decreases, the current goes up, so there is no real saving to be made on the installation. Then there are the rules about low voltage, extra low voltage and separated extra low voltage. Not as simple as just trusting in low voltage. Edit: Bit cross post with Jeremy

Just leaves me with a bilious feeling

I find putting 'xyz discography' mp3 into www.thepiratebay.org is the simplest method. If I am feeling posh and superior, I change the mp3 to flac.

Someone on GQT was asking about hedging. As usual, they could not agree. http://www.bbc.co.uk/programmes/b006qp2f But the best program toady, apart from the Archers, was The Food Program. It was about Charlie Hicks. He had the most complained about radio show in the 1990's, bloody hero. http://www.bbc.co.uk/programmes/b09r3qv0