When installing perforated pipe do the holes go up or down?

If you're installing a half-perforated pipe, such as half perforated twinwall, this is where the problem comes into question; whether the perforations are best facing upwards or downwards? Contrary to popular opinion, the most effective method is to have the holes facing down.
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Should holes in French drain be up or down?

Another important thing to remember in PVC installations: Orient the pipe holes downward. Counterintuitive though it may be, French drains work by allowing water to flow into them from below. Wrap landscaping fabric around the pipe to keep dirt and roots from obstructing the system.
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How deep should a perforated pipe be?

Installing a Perforated Drain Pipe. 1. Dig a trench that is about twice the width of the drainage pipe. In addition, make sure that you dig at least two-feet deep.
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How far apart are the holes in perforated pipe?

IMPERIAL Perforations shall consist of 2 rows of 1/2" (12.7mm) holes positioned at 120° radially on the pipe. Spacing between holes shall be 5" (125mm).
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Why does corrugated drain pipe have holes?

Perforated Tubing/Pipe for French Drains

Both circular and slotted holes will allow excess water to enter your perforated pipe, but narrow slots do a better job of keeping out dirt and other debris that circular holes may allow to enter, increasing the chance of a clog.
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FRENCH DRAIN, HOLES POINT DOWN - Here's Why



How big are the holes in a French drain pipe?

A 4-inch diameter perforated French drain pipe is likely adequate for most residential applications, but areas expected to experience a good amount of water collection and heavy soil saturation may require a larger-diameter pipe.
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How does perforated drainage pipe work?

Perforated land drain is used to collect water through the small holes located around the pipe; these holes allow water to seep from the ground into the pipe and be carried away or to percolate back into the soil at a practical rate.
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Does French drain need fabric?

Industry standard for French drains are 4 to 6 oz non-woven drainage fabric. Avoid using socked wrapped perforated pipe alone without drainage fabric as it will easily clog with dirt/soil.
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Should I use landscape fabric in French drain?

Non-woven geotextile fabric is the best choice for drainage applications where water flow through (permeability) is the main concern. Non-woven landscape fabric is commonly used in French-drains, drain-fields, and erosion control.
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When should you use a perforated drain pipe?

Perforated drain pipes are most commonly used to move rainwater away from the house so that it can drain elsewhere. Commonly situated near the base of your home's foundations, perforated drain pipes help provide optimal drainage for your property so that the likelihood of standing groundwater is significantly reduced.
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Do you need gravel under drain pipe?

Clay pipes can often be laid directly into a trimmed and formed trench (known as Class D bedding), whereas plasticware MUST be surrounded by a selected small gravel or pea-shingle. This essential bedding material can often cost as much as, or even more than, the pipes and fittings needed for the job.
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Why do you need gravel for a French drain?

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.
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How deep can you bury corrugated drain pipe?

Based only on personal experience, not any sort of reference, 6" cover (so a 10 inch trench depth for a 4 inch pipe) is a reasonable minimum unless your lawnmower is one of those things that weighs as much as a small car.
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What is the difference between corrugated and perforated pipe?

Solid Drain pipe, is a corrugated pipe, or flexible, pipe which holds water internally. Perforated pipe however, is identical in form to the solid pipe, however has holes or slots cut into the pipe for its entire length, allowing water to enter and exit freely.
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