Can I use pea gravel for a French drain? Do NOT Use Pea Gravel, Pea Pebble, Pea Stone When Building a French Drain. When building a French drain, you want to use a coarse rock that has been screened and washed. The rock that you see in this French Drain is 3/4″ and larger. You end up with large voids that'll move far more water.
What is the best gravel for a French drain?
“What kind of gravel is best for a french drain?” The best type of gravel for a french drain is a hard rock like granite chips or washed river rock. Preferably, the gravel pieces average at least 1″ wide to allow the best surface area for water to run along.
Is pea gravel good for drainage?
Like crushed stone, pea gravel can also be used for underground projects, such as drainage and pipe bedding. It's also a good choice when looking for fence post installation aggregate. Because it's small, pea gravel will move easily if not edged properly.
What kind of rock do you use for a French drain?
Use Natural 1-1/2" Round Rock for best drainage. Washed rock is ideal. Avoid small pea gravel as the spaces in between stone is smaller minimizing flow rates. Avoid Crushed Rock (Minus) that compacts and has "fines" that will clog pipe inlets.
Is sand or pea gravel better for drainage?
That's where drainage gravel comes into play. It's recommended to place down a few layers of crushed rock or sand underneath the gravel in order to stabilize the drainage surface. When it comes to drainage material layer size, typically a two- to three-inch layer of gravel will effectively deter water buildup.
Related faq for Can I Use Pea Gravel For A French Drain?
Do you need gravel for a French drain?
Good drainage is important to ensure that a home stays dry and free of mold. The old way of installing French drains is to do it without the gravel and the fabric. Without the gravel and the fabric, however, the drain can clog up with sand and soil over time.
What materials do I need for a French drain?
To make your French drain last a long, long time you need to use these following items:
Is pea gravel self compacting?
With respect to the gravel being "self-compacting"; while you are correct that it is not self-compacting it is almost impossible to compact pea gravel. If you run a roller over it, you may get the roller stuck because of the way the rock will continue to move around beneath the roller.
Is pea gravel expensive?
Pea Gravel Costs
The general range for a cubic yard of plain pea gravel is about $15 to $75, and a ton will cost about $10 to $50. For a colored variety, expect to add an extra $20 to $50 to those prices.
How deep and wide should a French drain be?
The trench should be about 18 inches deep and 9 to 12 inches wide. French drains need to have a slope of at least 1 percent, so the force of gravity will work for you. This means that the drain should slope down a total of at least one inch for every 10 feet of pipe.
What is the difference between river rock and pea gravel?
In fact, many people don't realize that pea gravel is actually river rock. It is just a smaller, smoother version of river rock. In terms of pea gravel vs. river rocks, pea gravel is simply better known for its smaller size and ability to be compacted.
What aggregate French drain?
Step 3: Fill the bottom of the trench with aggregate
The large aggregate will keep the water flowing quickly and with potentially fewer blockages, as any pieces of debris that manage to get into the system will flow through gaps in the aggregate. Aggregate that's 1 to 2cm across is generally ideal.
How much gravel do I need for a 100 foot French drain?
The volume of the drain is the volume of the "box" that is 100 ft long by 6 inches by 18 inches. That's 1200 x 6 x 18 = 129600 cubic inches. The difference between these will be the volume of gravel you need. Thats 129600 - 15080 = 114520 cubic inches.
Does a French drain need an outlet?
A properly designed French drain system does not require an outlet. The water will simply soak into the soil as it flows along the perforated pipe. In fact, a French drain doesn't require an inlet on just one end either.
Is pea gravel cheaper than pavers?
It is cheaper than pavers, easier to lay than flagstone, and you can usually get the job done in just a day. 2. You can walk on it barefoot without experiencing discomfort. Because pea gravel is smaller and usually rounded in shape, it is easier to walk on this product with a variety of footwear.
How do you seal pea gravel?
The best way to stabilize pea gravel is by using a binding agent such as cement, plaster, polyurethane, or epoxy coatings. If the pea gravel has not yet been installed, begin by laying down cement plaster on the area. Next, using pressurized water, remove loose gravel from the area. Finish by applying pea gravel.
Is pea gravel porous?
Pea gravel has porosity values that range from 32- 40% and hydraulic conductivity in the range of 2.2 x 10-2 cm/sec to 20 cm/sec.
How do you install pea gravel?
Compared to other hardscaping materials, installing pea gravel is relatively easy. Generally, you work the soil about 6 inches deep, remove any weeds, lay down 2 inches of coarsely textured base rock (also called crushed rock), and cover that with a 3-inch-deep layer of pea gravel.
Will pea gravel compact?
It's made from stone dust fines and crushed stone. The stone dust will settle and become compact to create a semisolid surface that is smooth. It is important that you know that this type of surface gravel needs to be sloped towards the sides of your driveway for better drainage.
Can you walk barefoot on pea gravel?
Pea gravel used for a walkway provides a softer surface to walk on compared with using a larger type of gravel. Walking on pea gravel barefoot is more bearable than walking on larger rocks which some times have jagged edges that can stab at feet.
What gravel is best for compaction?
CA7, otherwise known as ¾” limestone, or sometimes as 1” limestone, and commonly referred to as “bedding stone”, is an angular white/gray stone that self-compacts, making it ideal for use in backfill as well as pipe bedding, subbase and drainage situations.
Should I put sand under pea gravel?
Next, pea gravel shifts underfoot, so you'll need to carefully plan how deep your layer will go. Start with a heavy tamper to compress any soil underneath, add a sturdy base layer of either crushed rock or sand, layer on about 3 inches of pea gravel, and then tamp down again to make sure everything is compact.