Browse Forums Owner Builder Forum 1 May 21, 2009 11:45 pm Hi all I hope I can ask all you O.B. & budding O.B. a few questions. What’s the standard (if any or minimum) size of sewer pipe. I have a friend whose shower won’t drain fast enough. I was told it’s because they used too small PVC pipe, is this the case. Will it drain better & faster if you use a say 90 or 100 mm pipe? Now let me get this right, all the waist water (shower, sink, I think its call grey water) goes out the sewer pipe? Storm water is from the roof when it rains? I’ve got 90mm on my spec. is that standard, would 100mm be better as it’s offered at an extra. Water from the mains to house: On my spec. it’s in 20mm PVC. Is this standard/minimum size? Would I get a better water pressure if it was in a bigger pipe? Thanks heaps people this thread is a great source of information to all who are building.. Cheers KW.......... “It's just as unpleasant to get more than you bargain for as to get less” George Bernard Shaw. Re: Building Specifications questions. 2May 21, 2009 11:49 pm For sewer and stormwater drainage 90 mm or 100 mm are basically the only two sizes used. I would go for 100 mm. The price difference is very small (although you may be charged quite a bit more). With regard to water supply pipes, are you sure it's PVC? Demolition August 2009, Construction Started September 2009, Completed December 2010 Re: Building Specifications questions. 4May 22, 2009 1:11 am Casa2 From my spec. "Connect the house mains from meter to house in a 20mm PVC pipe. The piping to house in 20mm copper tube or Rehau Water Articulation System or equivilent. With 12mm copper branches to all fittings & hot water system." So what the hell does this mean. Is it copper tube, Is that the norm for water pipe? You are right the difference between 90 & 100 is next to nothing. But hey Im only the owner not the builder. So it will cost me at least 5 x the price of the 90mm. lol I just got 2 x 6 m yesterday. So I know the price. I may ask the builder about it. Do you think it would make a real difference? Thanks mate. KW............. “It's just as unpleasant to get more than you bargain for as to get less” George Bernard Shaw. Re: Building Specifications questions. 5May 22, 2009 4:23 am Hi KW, r u owner building this house or do u have a builder? if ur o/bing i strongly suggest u do an o/ber course & get a book or 2 from the library & have a read, a lot of what ur asking here and re concrete is very basic stuff & while we all should understand whats going into our house & its good to see u want to learn about it, better understanding the building process will take away a lot of worry as u build. i also suggest u go to a few suppliers & ask to look at these materials so u can see what u get for ur money & why some pipes more expensive than other. i like ur species about "pvc" external, copper internal - thats how i'd do it, some use blue line poly/pvc under slabs, its ok by rules, but not what i'd do (personal choise only) storm water pipe regardless of size can not be used for sewer lines. sewer pipe is heavier, stronger & a more important use - s/water is lighter & not moving "nasties" around. sometimes ur better off to use 2 or 3 90mm s/water lines than go into 100mm s/water - in all the houses i've built i 've never used 100mm s/water. in WA on a normal house 100mm sewerage is to move toilet waste, small sewer pipe is for waste water only,if ur using a builder ask him these questions so he can show u whats used where & why. if ur in doubt check with suppliers. if theres a conflict between builder & supplier post it up here & get a few opinions. if ur o/bing u r the "builder" u r responsible for meeting material standards, if ur using a builder he is responsible for meeting material standards & would be aware of penalties for using inferior material for wrong application. there r also inspections carried out by building & plumbing inspectors to check all this out along the way. hope this helps & u get a good well built house! Hi Casa2 - yes i notice a few species r still saying pvc - which i guess is a carry over from old class 18 & above ridgid PVC, which we have now replaced with "blue line" poly? perhaps someone hasn't updated pc programe for basic species:wink: cheers tony Thanks for your reply! All valid points and I agree with you on many of them. I am in QLD, any recommendations on a construction lawyer would be helpful 3 2052 You should check your detail drawings, it may show downpipe within brick pier. 14 8568 Hi Suku18 In NSW the statutory required insurances are: 1. HBCF ( Home Building Compensation Fund) - This is if the builder dies or goes broke. But this only covers 20%… 1 1279 |