Second, a retaining wall must have properly compacted backfill. 2014 took out t he back 48 feet posts came out easy cement came off easy posts were still in good shape considering wet ground….. put tar on the bottom 3 1/2 feet of it then covered with a plastic post cover then put it on top of 3 inches of gravel and tamped gravel around it … nice and solid. Some extra effort and patience backfilling the holes makes a big difference in the ultimate strength of the posts and the fence. Lightweight fences can sometimes be adequately supported simply by back-filling the posts with packed gravel, but for best durability, always anchor fence posts with concrete. 1 - 3 of 3 Posts. If you want to grow grass around the fence post, leave 2 in. I've got a little problem outside my area of expertise. Q. Pour 5 in. A goodf backfill starts with a perimeter drain leading to daylight or a drywell or other carrying system. March 9 at 9:12 PM. Pea gravel is a common landscaping material because it is easy to with and cheap. EVER! Fly ash has been used as a lightweight backfill behind a 25-foot-high wall and as an additive to highly plastic clay. and tamp again. To help prevent rotting, this deck will have wooden posts attached to concrete footers above ground. Literally the size of green peas, this gravel is self-compacting, meaning it presses together to form a nearly solid mass. It freezes in the bottom of the hole, and up and down goes the tube. 1 - 2 of 2 Posts. Gravel will be a good medium if you are going to install a paver or brick patio over the former pond. They will exhibit slight to no plasticity. 3,387 Posts #3 • May 22, 2014. In order to provide proper drainage, at least 12 inches of granular backfill (gravel or a similar aggregate) should be installed directly behind the wall. It’s an inexpensive way to backfill. It allows movement without building up lateral pressure. The post holes for pole barn have to be 4 ft deep and approved by building inspector. I'm bumping this post. that is advised where there is a distinct "narrow" gap between an earth bank and the rear face of the wall. In order to provide proper drainage, at least 12 inches of granular backfill (gravel or a similar aggregate) should be installed directly behind the wall.Compacted native soil can be used to backfill the rest of the space behind the wall. This footing method involves pouring a concrete pad at least 12” thick at the base of your hole. Those are the only places I'd ever use it." Backfill a Pool With Dirt is a process and backfilling is a process for all pool owners have to be aware of. Remember to follow local code for deck posts. Continue until you've reached the top of the pole. Not all soil types are good for holding in fence posts. Plan where you want the fence posts and then call the utility companies prior to digging the first hole so they can mark where gas and electrical lines run. Crumbly sort of stuff. 1. Top the gravel with soil. To that end, we always backfill with gravel, with the understanding that soil that has little water, does not … I dig a little deeper and add maybe 6" of gravel to assist with drainage around the bottom of the post. "If you're setting fence posts, you may want to consider using concrete at corner posts and on each side of a gate. I have to have the posts or footings 42" below grade for frost considerations. Around here if you backfill with gravel, the water runs to the bottom of the hole, and is trapped in the hole by the clay. If the soil type you’re working with is sand, sandy loam, gravel or a Moved from here. Hope this isn't too late... the best backfill in your situation would be pea gravel. What Kind of Material Used For Backfill? Coarse-grained soil: This includes sandy soils with gravel components Fine-graded soil: This includes fine sand with low plasticity Commercial by-products: Such by-products include fly ash or furnace slag backfill material. Did a little backfill , installed base gravel, top dressed with #5 wash stone. The post is then set with the aid of a rock bar. Use crushed gravel to set the posts. After reading about the drainage issue, should I instead put in 1' of gravel … Reactions: allendk and backstay. COOL! Posted: Sun Oct 20, 2019 4:00 am Post subject: Backfill posts? Seems to be an issue of rot. and rocks to backfill around it. Anybody have any ideas on the best way to install deck posts and backfill in this kind of situation? Avoid Wobbly Fence Posts: Backfill Holes Securely Want sturdy fence posts? Backfill with pea gravel then landscape. We use conduit 99% of the time. Backfill refers to the dirt behind the wall. Fence Post Checklist. of gravel in the hole around the posts and tamp it down. ArfArf, good evening. Backfill with poured concrete or gravel. I happen to have quite a bit of pea gravel laying around. Backfill refers to the dirt behind the wall. My question is, if you had a choice would you backfill with dirt, white rock or sand and gravel? When building a retaining wall or garden border or setting fence posts, backfilling with pea gravel … DEAR POLE BARN GURU: I have read much debate about setting the poles in concrete with no “footing” beneath them vs. setting the poles on a concrete footing and back filling with gravel and earth. What is everyone backfilling with? Posts must resist wind pressure; Set posts in crushed gravel instead of concrete; Gravel easier to remove than concrete in future; Call 811 before digging - ALWAYS! A lot of people will throw rocks at this method (sorry) but using gravel does a couple of things. One way is to pour concrete in the post hole, set the post on the concrete and backfill with gravel. Gravel is also like a good defense in football. Even if you have to buy more clay, you’re bound to save money compared to buying loads of gravel and other rocks. The "Classic" material to use behind a retaining wall is a single sized gravel, but? PVC is so cheap, why not use it? Clay is present all over the western portion of the USA and many other parts of the world. MYSTIFIED IN MAGNOIA. No water, no moisture, no rot! My 5-foot-tall solid-picket privacy fence has had some issues over the past 10 years. Compacted native soil can be used to backfill the rest of the space behind the wall. My manufacturer recommends concrete slurry but I'm not burying it all the way - only going 2' . Compacted native soil can be used to backfill the rest of the space behind the wall. The holes dried out and expanded a little. Class D: Use pit run or bar run material, well-graded from coarse to fine. Will you warranty it when it fails? 2. Join the discussion. This geogrid product doesn't seem to be tested with such a large stone. Designated size shall be 1" - 0 or 3/4" - 0. Coarse-grained soils include gravelly and sandy soils and range from clayey sands (SC) through the well-graded gravels of gravel-sand mixtures (GW) with little or no fines. Would you backfill a foundation with 100% gravel? The resulting pressure heaves the fence posts out of the ground over time. I have heard that if you use all gravel the water will get to the weeping tile faster, but perhaps the sump pump cannot take it away fast enough causing hydrostatic pressure along the foundation wall. If you already have clay pulled from the ground, then it’s free. The use of commercial by-products, such as furnace slag or fly ash as backfill material, may be advantageous where such products are locally available and where suitable natural materials cannot be found. The stronger the support, the less the pavers will sink. Cons of Backfilling With Clay So what do you do instead of concrete, gravel? Dirt from the hole, sand, gravel? It mostly consists of a mixture of gravel and sand mixtures with a negligible amount of fine materials. There are several methods for setting posts. Class B: Use Granular Material consisting of gravel or crushed Rock meeting the requirements of Section 31 23 00, Excavation and Backfill, General. Reply. First, it lets the water drain away from the wood right on down into the ground. Even if you know the general soil type for the area you’re going to fence in you’ll usually have to dig a few holes to find out what you have to work with. The types of materials used for backfill is the key to success. The latest problem is posts … of space between the top of the gravel and the soil line around it. The best way to prevent frost heave in fence posts is to set them on a drainage bed prior to pouring the concrete. Facilitates Drainage Proper drainage is a key element for a healthy landscape. Second, a retaining wall must have properly compacted backfill. Fine Graded Soil: Finely graded soil with low to medium plasticity can be used as backfill. When building a retaining wall or garden border or setting fence posts, backfilling with pea gravel instead of sand, crushed limestone or other materials has benefits. My plan was to put 12" wide 4' high sonotubes in the ground, fill the first 1' with cement, then add the posts and backfill with cement. I've three options for stone size; 6 - 10mm, 20 - … The ground's a mixture of clay and degenerated rock. I have always used treated posts and crushed gravel to secure fence posts. Could I backfill around the piers with gravel instead of soil? Class C: Use clean sand with no particle size larger than 1/4 inch. ... And even this extra effort is still simpler than bringing in concrete or gravel, right? The engineer is proposing to backfill the entire reinforced soil zone with 2-1/2" crushed stone. In order to provide proper drainage, at least 12 inches of granular backfill (gravel or a similar aggregate) should be installed directly behind the wall. Jon Horton gravel man. The Course-grained soil includes gravel mixed soil and sandy soil. The pressure created by the movement of the clay will be dissipated by the gravel.. What is the preferred method to set fence posts? I'm just in the process of re-doing my foundation and am wondering if using all gravel backfill has advantages or disadvantages. "Ground rated" treated wood contains a higher concentration of preservative chemicals than normal wood and will offer increased protection from decay while buried in soil. There is NO WAY I'd ever install DB wire with gravel backfill. Here in Maine we never backfill with concrete because the rough texture causes the frost to "grab" the concrete, and with that 9% expansion upwards every year, tends to lift posts out of the ground. What do you recommend? Backfill materials that are commonly used are described below with their engineering properties. Add another 5 in. It bends, but never breaks. Save Share. If you’re hiring a builder to do it for you, make sure they are transparent with the process—especially when it comes to knowing how to backfill a pool with dirt. Coarse-grained soils. I'm putting in a retaining wall, about 2m high and I'm looking to backfill behind it with gravel, to provide drainage. The idea behind this is to prevent the ground from sinking further over time. Course-grained soils are one of the commonly used backfill material. You must grade the clay at 45 degrees from the footer up to grade. The RFid (installation damage reduction factor) for a 3/4" stone is 1.25, for sand is 1.10, and for silt/clay is 1.05. the gravel is best wrapped in a "Geotextile" to prevent the gravel being clogged up with small particles of dirt and earth. If the gravel is properly compressed the post should never waver. DEAR MYSTIFIED: It seems you and I have been reading the very same posts on advice boards all over the internet! Next, set a pressure treated wood support post rated for "ground contact" on top of the pad and backfill the soil into the hole.
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