Navastone Wall

NasConst_land

Bidding a retaining wall out right now, it will be no higher then 3' from the ground and the project designer from Navastone is not using any sort of structure tiebacks or geogrid. I know its only 3 feet high but it is holding a front yard back from city sidewalk, and the wall there now was not built right therefor it fell over, and thats why we got called. I just dont want to see the same thing happen. What do you guys think about the tieback situation, and drainage, usually we wouldnt put any in and just backfill with stone, but it seems like it might be a good idea to put some drainage in.

Peladu

If you don't do it to your standards, have them sign off on any warrenty issues.

Other then that, hopefully someone can answer you better.

XXL Hardscaper

I am unfamiliar with navastone. In my area using Mesa or Cornerstone I would not have a problem building a 3' wall with no grid. You definatly want to have proper drainage= Perferated pipe wraped with fabric daylighted through the face of the wall every 25 to 30 feet and a minimum of 12 to 14 " of 57s or clear 3/4 to 1" stone. I also put fabric between the gravel and the soil to keep the gravel from becoming contaminated with soil.

NasConst_land

How do you bring ur drainage threw your wall, I assume thats what you meant.. The block that I will be using will be a beveled edge block.

XXL Hardscaper

I cut a notch in the bottom of the block just enough for the pipe to come through the face. so if you are butting up against the city side walk you should have atleast one block below the grade of the side walk. You would dalight your pipe out through the second course of block.

NasConst_land

what size of pipe do you usually use 1''? to come threw the block that is.. and do you caulk the gap between the pipe and block and use a polymeric sand to match the block to fill agaisnt the caulk?

XXL Hardscaper

4" coragated just like the perforated pipe behind the wall. A 1" pipe is no were near enough to relieve hydraulic pressure from behind the wall. If the project designer from Navastone has not addresed this I would definatly look at a supplier or manufacturer that has a more knowledgable staff.

LandscapePro

Nas,

You could also slightly "crown" the base material in the center, then run the 4" on taper to bring the water out at each end of the wall. Just a thought. Make sure the Navastone signs off on whatever you decide.

Mike
La. Landscape Contractor #2576

mattk1895

We put drainage stone behind any burried wall. Anytime you have water pressure in the backfill, you run the risk or the wall pushing. I would recomend using atleast one row of geogrid. I know that most mfg. do not call for it under 4' but I would not want to run the risk. If you are holding back soil, that soil is going to have pressure involved with it, so you need to cover yourself. Are you burrying a course? That will also help.

NasConst_land

Ya i think i will run some geogrid, and we always bury a course.. doesnt make sense not too.. unless ur really trying to save cost. This is an insurance loss job so everything will be done exactly to the manufactures specs, and they will sign off on it then we will follow the exact specs so we are covered. I would recommend not doing insurance work, to much BS not worth the time to put up with all middle man stuff and authorize to work, or pay or whatever they want.. Sign the contract and lets get it done, not wait for the ok from 4 other people. Cant turn work down though, especially in the winter when its not snowin