Browse Forums Building Standards; Getting It Right! 1 Mar 29, 2009 12:04 pm Hi all, wonder if anyone can tell me if there has been a change to the method of fixing HW & cold copper pipes in the ceiling where these traverse timber framing. a plumber i was talking to last week, mentioned that he now puts a saddle on every second timber, and applies silicon on the "non saddle" timber - ie a silicon bed on the timber? another plumber says he has not heard of this.....can anyone advise me which method is correct? cheers tony Re: Correct Fixing of HW & C copper pipes? 2Apr 02, 2009 11:48 pm no takers on that question.... but today i got the answer, some plumbers r apparently using the silicon as a "bed" between copper pipe and wood or brick surfaces if a saddle isn't needed. helps stop pipe "rattle" and "water hiss" .... so they say - might be worth trying can't do any harm as far as i can see!?! cheers tony Re: Correct Fixing of HW & C copper pipes? 3Apr 12, 2009 4:38 pm T&V no takers on that question.... but today i got the answer, some plumbers r apparently using the silicon as a "bed" between copper pipe and wood or brick surfaces if a saddle isn't needed. helps stop pipe "rattle" and "water hiss" .... so they say - might be worth trying can't do any harm as far as i can see!?! cheers tony sounds ok personally i would use foam wrap on every unclipped joist Re: Correct Fixing of HW & C copper pipes? 4Apr 13, 2009 7:43 pm The silicone bedding thing is a non approved form of fixing. Using a saddle and silicone might be a better way to go. As for stopping what you called "water hissing", it wont. What I think youre referring to is turbulance. Its caused by high pressure water trying to make its way through a reduced space. For example, when water flowing through a 20mm line is forced into a 15mm line turbulance is created which causes the hissing noise. reducing the pressure with a pressure limiting valve at the meter might help. Clipping the pipe wont do much to stop that, but it will assist in water hammer.....thats the loud knocking noise you hear sometimes when taps are turned off. But, more than likely the knocking noise is created by cheap tap washers (nylon) vibrating and sending this vibration back into the pipe making loose pipe hammer. One tip I can give you to avoid water hammer, is to make sure your plumber replaces the washers that came with the taps with good quality brass washers. If hes used mini cistern taps on WC, and flickmixers, get him to change them to ARCO mini cistern taps. They are a ball valve and have no loose washers in them. If you have a storage hot water unit, you will have a pressure limiting valve installed on it. It will most likely give you differing hot and cold water pressures, (which can make finding the right shower temp. difficult) Its better to have it installed after the water meter, so the cold and hot are the same temp. A good brand is a Caleffi. DIY, Home Maintenance & Repair We have a hot water copper pipe that runs from our hot water unit on one side of our house under a concrete slab to our bathroom and laundry...old house so not ideal. The… 0 5107 I'll look into different shower heads and ask the plumber about some engineering and see what he says. Thanks 2 9551 Plumbers 'can be' plumbers, made all the worse by self certification which the building surveyor invariably accepts as proof of compliance! The good thing is that you know know. 3 4835 |