Browse Forums Landscape & Garden Design 1 Apr 21, 2011 3:25 pm Im about to install an Ag pipe to the front adjacent to the slab footing. After much research, I have come up with this sketch to provide full protection of the house footings. I will be digging down to the base of the footing, pulling back the orange plastic slab membrane , painting the slab with black waterproofing coating, installing an additional plastic membrane in front of the orange plastic. Then digging a trench next to my footpath (approx 500mm deep), AG pipe to the base covered in gravel, then all wrapped up in a geofabric. Can someone comment and ensure what I have set up is correct. Queries: -Pulling back the orange plastic slab membrane - Is this possible? -Does the Geofabric wrap completely around the gravel and across the top also? How thick should this be ? (ie do i wrap it up a few times?) -Does the drip line sit above the soil and feed directly to plants or does it sit below the surface directly into the soil? Or can it do both? I have attached a section for reference. Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Any comments or advice would be greatly appreciated. Thanks. Re: Installing Ag pipe 2Apr 21, 2011 5:17 pm Only a single layer of geo-textile will be fine. A better job is to to omit the geotextile completly and fill up the top half of the trench with sand. It has been found that geotextile can be come clogged after 10 or more years and stop doing its job. The Harder You Try - the Luckier You Get ! Web site http://www.anewhouse.com.au Informative, Amusing, and Opinionated Blog - Over 600 posts on all aspects of building a new house. Re: Installing Ag pipe 3Apr 21, 2011 9:02 pm What a great thread! I've been thinking along the same lines, except for waterproofing the slab edge. Why do you want to do it? I was thinking about that earlier in the build, but not any more. How old is the house? Do you have a particular problem with drainage or some other terrain/levels issue? Will the ag pipe have enough slope? Where will it discharge? Like Bashworth said, I am also a bit sus of these ag pipe solutions. Of course they work, but not forever. That's why we've decided not to concrete over them, so that we have the access to them need be. But that doesn't bother you, since you've already planned the same thing. My signature is distracting people from my wise posts ... Re: Installing Ag pipe 4Apr 22, 2011 2:12 pm no i have no problems with drainage or anything like that, its a brand new house so im just setting up all my irrigation and landscaping. I have a blank canvas of dirt n rock at the moment so i would prefer getting it right from the start. Terrain is pretty flat so thats a little reason why i intend on setting up an Ag pipe, just to ensure that the moisture is drained away from the house slab. im waterproofing the slab for extra protection! just some advice from a few people, and i'd rather be safe than sorry! as you can see from the pic, im intending of runnning the ag pipe directly along next to the path, to the front of the house. http://i989.photobucket.com/albums/af20/grechy12/newdesign.jpg Re: Installing Ag pipe 5Apr 22, 2011 3:43 pm mikeg12 im waterproofing the slab for extra protection! just some advice from a few people, and i'd rather be safe than sorry! Would you like to share a bit more about this? What tips/advice did you get? I think it's too late for us, though ... My signature is distracting people from my wise posts ... Re: Installing Ag pipe 6Apr 22, 2011 5:00 pm Sorry I don't know a huge deal about it, that's kinda why I put it on here so someone could provide some additional expert advice . I havent purchased any waterproofing membranes or paints yet so I'll prob get a bit more info from the shops when I get there. Sorry ! I just wonna make sure what I'm doing is correct so I'm not wasting my time ! Re: Installing Ag pipe 7Apr 22, 2011 8:00 pm Just had another opinion from a nursery owner, hes not 100% sure about the no paving against the slab but when I explained with the ag pipe and small plantation he was convinced should be ok. But he did suggest he wouldn't touch the membrane against the slab. He said it's solid and hard up against te membrane as it is, and pulling it down to paint the waterproof membrane may cause more problems ? Just another opinion I suppose ... Add it to the list.
Re: Installing Ag pipe 8Apr 26, 2011 10:08 am I have seen this approach in really wet areas, (high rainfall and poor drainage) and usually where they havd a basement. I'm not sure its necesary if you dont have this problem though. Normally you limit digging along the edge of the foundation as it can weeken the support (rule of thumb is follow a line of 45 degrees from the edge of the slab, and dont dig in that zone) Moisture next to the slab isnt always a problem, and many houses crack during summer because the ground dries out too much (its about keeping a ballance) There are a range of tar based waterproof membranes and sealers you could use, but normally just keeping your paths and decks below the damp proof membrain is enough to stop rising damp. Re: Installing Ag pipe 9Apr 26, 2011 6:59 pm mikeg12 Sorry I don't know a huge deal about it, that's kinda why I put it on here so someone could provide some additional expert advice . I havent purchased any waterproofing membranes or paints yet so I'll prob get a bit more info from the shops when I get there. Sorry ! I just wonna make sure what I'm doing is correct so I'm not wasting my time ! I'm not at all an expert in this area, but I read some time ago something about waterproofing slab edge being a bit tricky. I think the issue is in any moisture that's already trapped in the slab and where does it escape if the slab is virtually sealed from all sides (the edge, the plastic under, potentially a glued flooring above). Obviously, not all slabs would be affected by this. My signature is distracting people from my wise posts ... Re: Installing Ag pipe 11Apr 27, 2011 7:36 am No worries. BTW, what is the best depth for the ag pipe? Does it have to be at the bottom of the slab, regardless of how thick the slab is? What is the governing factor? For example, if the slab edge is 400mm deep, align the placement of the ag pipe to be at the same level (bottom of slab). So, the ag pipe would be fairly deep. If the slab edge is only 130mm, again align the placement of the ag pipe to be at the same level (bottom of slab) - in this case the ag pipe would be very shallow. Is this right? Can anyone comment?? My signature is distracting people from my wise posts ... Re: Installing Ag pipe 12Apr 27, 2011 7:55 am More inclined to use vertical drain next to footing, with flo pipe at base. Don't forget to incorporate some surface drainage. Digging a narrow trench along the footing by hand won't comprise the footing, don't bother waterproofing. You could line footing with core flu sheeting this is better than plastic. Here's a link to drainage products which are much more effective, http://www.atlantiscorp.com.au/civil-en ... aldrainage Landscape Design & Construction http://cherub.squarespace.com/ OK it's been a little while! I've been busy getting time where I can to work on this. I started by grading a pad (borrowing a… 26 19868 yep sounds good make the footing bigger to to allow for the pipe in the middle 3 7250 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 4768 |