gwebstech

Hi all Im coming to concrete the slab on my new build. so 1500mm type 1, 50mm sand, visqueen, 125mm insulation , reinf, and then 4 inches concrete I understand the concrete floor needs a 25mm upstand around the perimeter. This upstand needs to be as low as the bottom of the floor insulation - correct? My main query is - ive read that the 25mm upstand should be as low as the cavity insulation too - that cant be right as the cavity is infilled with concrete to 225mm lower than damp course and i thought you only started putting cavity insulation in, when you have got the slab down and are building the actual walls of the house (not the substructure). So i guess that i also need to put insulation down in the substructure cavity under the visqueen overlap? is that what i misunderstood? thanks

Hi all Im starting a new build soon, and the bricky im using is getting the bricks on his account - but when i come to claim the VAT back, dont the invoices for nay materials have to have my name and address on them? i eman as far as the taxman is concerned, i thought i read that somewhere. thanks

near Alfreton off J28 mate

Did everyone use draw cords for their pipe ducting? i thought the ie water pipe would just be pushed through easily enough on its own? thanks

ive had 2 quotes here in the East midlands, one from a guy who works on sites a lot said £18m2 blocks- so £1.80 a block and the other was £27m2 supply and demand i suppose good luck

thanks, my architect told me that the visqueen is effectively a 'radon barrier' anyway, so thats one less thing i have to worry about

Hi all Im hoping to lay the concrete floor soon on this new build. Am i mistaken or have i seen somewhere that when you lap the visqueen over the outside course, that the outside course is slightly higher - prob 1 brick - than the inside course? Also im assuming that you ALSO need a separate DPC - the black thinner roll type - that goes on top of the visqueen? and that is used as the correct DPC? thanks

thanks for the help guys

Hi yes it is trench fill But in my notes from the architect it says that its cavity filled with concrete to either 225mm below DPC or 150mm below, im not sure which is rigt and why it states 2 differing options thanks

Hi all Im getting ready to pour my concrete into the trench weve dug. The trench is about 1m deep, the building notes say 700mm conrete into that, then build the substructure from either 7n concrete blocks and or engineering bricks. Seeing as laying the initial first courses in the superstructure is slow and time consuming (ie expensive as i cant lay bricks well) im wondering what the maximum depth of concrete i can pour in? i know the engineering bricks/blocks have to be filled with concrete to strengthen them, but am i determined by where the DPC will be and the concrete cavity fill has to be a certain depth below the DPC? Can i put more concrete in and save a couple of courses of bricks? thanks

I was looking today and there is nowhere that out phone line comes out of the floor, our phone connection point is on the wall above the skirting so would our line have come through the cavity?

wow very helpful guys thank you

Hi all Im juat wondering if anybody knows of a tool or calculator where i can compare ie 50mm foil insulation to 100mm rockwool im thinking of insulating a loft and it will need 400mm of rockwool but i know how horrible that is to use, even with masks etc and was considering spending more and using foil boards for example but i dont know what to compare. id imagine 250mm foil boards is as warm as 400mm rockwool but i need to work it out thanks

so, the gas. elec, water companies want all their pipes ducted from the road right up to/inside the house then?

brilliant, i hear brillo pads work well too

and when you guys have used ducting to get xyz in the house, what did you fill it in with? otherwise it wont pass an air tightness test surely

Is this on a new build? why not just run it underground on the outside of the house and up to the meter box on the outide of the wall?

Thanks for the bruilliant reply Declan, ill check those products out. I know the toilet waste has to be in situ, the waste water ie from sinks will go in pipes coming out of the walls. as will the other 2 toilets will be coming out of the outside wall and down. im assuming that the gas and elec they would go to the meter boxes on the wall and were covered with a protective pipe like on my house (built circa 2001) thanks

Hi all What sizes are the water pipe that will come into the house for a new build connection? i need to knwo what size ducting to buy to route the water and electricity cables through thr concrete floor. Is it just the elec and water that needs the ducting? thanks

Thanks for the help guys

Hi all Ive been given my building regs spec by my architect, and he says that 100mm kooltherm is fine for the concrete slab, (its a new build) he says a recent project used it and it got a B energy rating. Ive looked at the prices and its circa £30 sq.m where i can get celotex 150mm for about £22 sq.m ! so a saving of about £600. do i need to look at which has the highest R value to see which gives best heat insulation? the kooltherm R is 5.5m2k/w and the celotex is 6.8 m2w/k or do i need to look at the thermal conductivity? thanks

Hi all After reading the specs for this new build im hoping to get cracking on, it says to use easi joists or wolf system joists, anyone recommend a firm thats relatively cheap for these? thanks

thanks, yes that dawned on me today thinking about the drainage- doh!

thanks mate, this is what i was thinking is theo nly way to do it. Im assuming BCO passed this? my point was that you have to break the membrane somewhere which i thought wold cause damp/moisture issues

after your toby??