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FAQ

Can I hang the liners from their flanges?

Typically, no. Planter Technology recommends basal support (joisting 16″ o.c. usually suffices) for all planter liners. Continuous support (plywood or the like placed over the joists) is even better.

Do you do custom liners?

We do any and every type of custom planter liner, whether large or small. We have developed processes to manufacture small quantities as efficiently as large. Planter Technology has been involved with large complicated projects, and can work with the designer through every step of the way.

Do you have a set size range?

Planter Technology does over 250 different types of standard planter liners, from standard tooling. These range from 18″L x 8″W x 8″D to 72″L x 30″W x 17″D

How do I treat the liners in my design?

For the best examples ask for our Sample Details to see drawings of liner conditions. There are as many individual solutions as there are designs, because each aspect of the job makes a different priority in liner design.

How is this different than fiberglass?

Fiberglass (Fiber Reinforced Plastic) is another common material used in the manufacture of planter liners. Planter Technology also uses fiberglass, when appropriate. Fiberglass may be somewhat more rigid than the thermoplastics used by Planter Technology. It may crack and split easier than the other thermoplastic materials, and is slightly more affected by harmonic vibrations. For the most part, the materials are comparable.

What is thermoplastic?

Thermoplastic materials are the class of plastics that soften with heat, may be formed and then reharden upon cooling. Planter Technology typically uses high impact polystyrene (polystyrene with rubber added), linear low density polyethylene, and polypropylene.

Why do some liners have different lips than others?

This is typically a function of the manufacturing process. High Impact Polystyrene liners, which are vacuum formed, get their flat flange when drawn. This serves the additional purpose of strengthening the wall, keeping it from bowing along its length. The Polypropylene liners are welded of stress-relieved PP sheet material, and so no flange is required. Wall support, if necessary, is achieved by means of bosses. Polyethylene liners are usually rotationally molded, and the return lip is required to keep the edges in shape along the length of the liner.

Why use a planter liner?

Nobody has heard more horror stories about leaking planters than the staff at Planter Technology. Primarily, planter liners are to prevent long term water damage to a building and to the decorative planter itself. Planters are a notoriously difficult condition to waterproof. Optimally, the soil is moist most of the time. Most waterproofing materials are not formulated to be continuously wet. Maintenance contractors regularly work in planters with sharp tools that can nick and cut membrane waterproofing. Roots of plants are looking for seams to grow through, especially in poorly installed waterproofing. The roots grow into drains, clogging them and causing the planter to fill with water, a task most waterproofing isn’t up to after years of exposure and accumulated corrosion. By using thermoplastic modular planter liners, most of these problems can be avoided. Thermoplastic unibody construction liners are made of .250″ material, and will never corrode or weaken through the effects of water. There are no problems with continually moist conditions or seams. Modular liners may be removed to be worked on, or to have the area around them worked on, without disturbing the rest of the planter. Planters no longer have to be fully “dug out”. The liner may be removed quickly and easily in case of a problem.

How the Coronado Box Irrigation System Works?

Coronado Boxes are self-contained fiberglass window boxes, with a double-walled water reservoir for irrigation. The reservoir needs to be filled by hand every 2-4 weeks, depending upon the plant types and location. The reservoir fill hole is plugged with a stopper, creating an air-tight, closed reservoir.

The water in the reservoir flows into the soil through tiny holes along the bottom of the inner liner. The water wicks its way up through the soil until it reaches the moisture sensor, planted 1/3-way down the liner. Only one sensor is used per Coronado Box, no matter the number of water inlet holes (which varies depending upon the length of the liner). The sensor tip absorbs water, and closes like a valve, preventing air from passing through the tube into the reservoir.

A vacuum develops above the reservoir, preventing water from flowing into the soil. As the plants use the moisture and the soil starts to dry, the sensor tip dries and allows air to pass through. The vacuum is broken, allowing water to flow into the container, until the soil becomes moist again.

The process forms a cycle, interrupted only by the removal of the stopper and the filling of the reservoir. The overflow drainage adapter at the side of the unit allows excess water that builds up (typically rainwater) to escape without disrupting the system.

How CWS Planter Liners Work?

CWS Planter Liners are self-contained units, consisting of a planting area surrounded by a double-walled water reservoir. The reservoir needs to be filled by hand every 2-4 weeks, depending upon the plant types and location. The reservoir fill hole is plugged with a stopper, creating an air-tight, closed reservoir.

The water in the reservoir flows into the soil through tiny holes along the bottom of the CWS Liner. The water wicks its way up through the soil until it reaches the moisture sensor, planted 1/3-way down the liner. Only one sensor is used per liner, no matter the number of water inlet holes (which varies depending upon the length of the liner). The sensor tip absorbs water, and closes like a valve, preventing air from passing through the tube into the reservoir.

Provision of free-standing SeaCrest Series Controlled Watering System (CWS) Planters.

Type: Self-contained, free-standing units with integral air- and watertight reservoir requiring no irrigation or drainage lines. Vacuum sensor system to control release of water from bottom of unit into the root zone. Water reservoir sized to maintain plants for up to 4-6 weeks, and have a recessed water inlet port. Planters will be leakproof, will not leach salts, and require no additional drainage or waterproofing. Units to have decorative rolled rim, and integral threaded inserts for attaching tree tie-downs (see below)

Material: lightweight, durable linear low-density Polyethylene (PE).

Color: Choice of 7 faux-stone Matrix finishes or selection of solid colors – see Planter Technology catalog for examples of typical colors.

Finish: Factory finished sanded/pebble texture. All seams to be trimmed and flamed by the manufacturer.

Sizes: 24″, 30″, 38″ or 55″ in diameter in varying heights ranging from 12″ to 36″, or rectangles and squares – see Planter Technology catalog for specific sizes.

Exterior Applications: Manufacturer to install drain assembly including stopcock with garden hose adapter for control of drainage. Manufacturer to include siphon tube assembly to be installed during planting of unit.