Browse Forums Paving & Concreting 1 Mar 06, 2011 9:33 am Hi Me again, I want to make a concrete wall to separate the patio from the rest of the garden. The wall will be 300mm high 250mm wide by 3m long. I plan to tile the wall once in place. The wall wont be a retaining wall, just acting as a defined barrier. I will put a garden bed on the other side of the wall, but as the yard is flat there will be minimum soil build up behind it. I was planing to form the wall and footing all in one by digging a trench 350mm wide and 100mm deep. Forming the wall with plywood and pine to strengthen and support the form. The plan is to leave a gap at the bottom of the form to allow the concrete to fill the trench. With the form just lower than the top of the trench. I Am I on the right track here or will I end up with concrete everywhere? Would I be better to pour the footing separately then the wall? I was planning to get a load of concrete delivered and filling the form directly from the concrete truck. I have some paths to concrete at the same time. What kind of reinforcing it required here? I was think about running a single bar of reinforcing along the footing and having vertical reinforcing bars every 300mm. Would this be enough? too much? just right? I also thinking about using the same technique to form a large raised garden bed, 2m x 2m by 400mm high. Anyone have any thoughts on my plans or have any experience with forming concrete walls? Thanks Luke Re: Making a poured concrete wall 2Mar 06, 2011 11:34 am If it was me I would Dig a trench 300mm deep and 300mm wide. I would use 400mm deep forms so the bottom goes 100mm below ground level.(this will give you a better surface if you want to pave against it) For reinforcement I would use a mesh stood upright between the forms. Make sure that the forms are fastened securly together at the top otherwise the pressure of the wet concrete can blow them apart. Don't try and do too much concreting at once as concrete goes of about an hour after the concrete is added and if you haven't finished the quality of the final surface will suffer. 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: Making a poured concrete wall 3Mar 08, 2011 9:23 am I have to agree with bashworth. Bigger footings and mesh sl72. Some N12 reo in the trench. Concrete is heavy and wall blow outs are not uncommon, brace well. Also have some help as filling the wall and the paths will take "time", which is in short supply the moment a concrete truck arrives. Its not allot of concrete and could be done with mixer. Good Luck Pulpo Re: Making a poured concrete wall 4Mar 08, 2011 6:42 pm Hi Guys Thanks for the information you are very helpful. So taking your advice I will dig 300 x 300mm trenches. I will have the forms 100mm below the surface of the ground and well braced and tied at the top to avoid a blow out. I plan to use some plywood with pine stringers screw in for rigidity to make the forms. With the reo in place I will then pour the concrete in the top of the form letting it fill the trench and then fill the form to the top and screed off level. I am planning to use a stick of some kind to make sure the concrete is push down into place and bang the side of the form to release air pockets. With the Reo, Do i need to tie the reo N12 bar up off the bottom of the trench? If so how far? I was thinking I will cut the mesh and stick it into the bottom of the trench for support before pouring. How far below the top of the wall should the reo mesh go too? If I want to make raised planter boxes in the same fashion should I tie the mesh together at the corners? Given that the forms will be 100mm into the concrete once poured, how long should I wait to remove the forms? I will use some mould release on the forms such as diesel or similar. Thanks Luke Re: Making a poured concrete wall 5Mar 08, 2011 7:24 pm I will have the forms 100mm below the surface of the ground and well braced and tied at the top to avoid a blow out. Make sure they are braced against pegs at the bottom at the bottom and it helps to have some cross pieces attaching the tops of the forms together I plan to use some plywood with pine stringers screw in for rigidity to make the forms. Should be OK With the reo in place I will then pour the concrete in the top of the form letting it fill the trench and then fill the form to the top and screed off level. b]Should be OK[/b I am planning to use a stick of some kind to make sure the concrete is push down into place and bang the side of the form to release air pockets. Better to use a steel rod (I use a fencing bar) With the Reo, Do i need to tie the reo N12 bar up off the bottom of the trench? If so how far? Can't really say as personally I wouldn't bother with mesh for a wall this low unless I attached one bar to the mesh I was thinking I will cut the mesh and stick it into the bottom of the trench for support before pouring. Should be fine How far below the top of the wall should the reo mesh go too? 40mm If I want to make raised planter boxes in the same fashion should I tie the mesh together at the corners? Yes Given that the forms will be 100mm into the concrete once poured, how long should I wait to remove the forms? With the width of the concrete plus 25mm for each form in a 300mm trench the concrete should not come up the outside of the form. Leave the forms for at least 24 hours longer if possible I will use some mould release on the forms such as diesel or similar. Worth doing 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: Making a poured concrete wall 6Mar 08, 2011 8:33 pm I'd be interested in seeing the work completed. Re: Making a poured concrete wall 9Apr 06, 2011 6:17 am If your going to go to all the effort of pouring a concrete wall, instead of tiling it why don't you get it polished.
It will look better than tiles and probably last longer, we're doing one at the moment around a pool
Hello needing some advice. I was about to build my Alfresco and needed a new slab and remove exisiting slab as its not standard. So they start to excavate and jackhammer… 0 10687 Thank you again Simeon.. I will call my certifier for that. Have a good day 4 5179 |