Shims/Packers

Plastic packers and plastic shims make levelling fast and accurate. Colour coded for easy identification and available in various sizes and thickness (mm), they support precise alignment around windows, door frames, flooring, and other construction details so you can create a clean, professional finish.

Plastic packers and shims for precise alignment and support

Our range includes assorted packs and single-size options to suit different applications. Products are usually in stock so you can add to basket, confirm delivery to your postcode at checkout, and have items dispatched shortly. Prices are shown ex VAT and inc VAT, with VAT added at checkout.

What are plastic packers and shims?

Shims / packers are small, durable, plastic spacers used to level, pack, or adjust components before fixing. The colour system indicates thickness for quick selection on site, reducing setup time and helping the job run smoothly.

Is a shim the same as a packer?

In most trade contexts, the terms are used interchangeably. A shim (or packer) is placed between a surface and the item being fixed to achieve level, plumb, or a specific gap before you tighten fixings.

What is the purpose of a shim?

Shims provide temporary or permanent support, bring components to level, and protect finishes by spreading load. They are ideal where small adjustments are needed during installation.

Applications of plastic packers

• Windows and doors: align frames in openings and maintain even reveals.
• Flooring: set levels for battens, thresholds, and subfloor details.
• Render-only and EWI detailing: as setting aids alongside beads and mesh before final fixing.
• General construction: pack cabinetry, cladding rails, and services where precise gaps are required.

How to correctly use shims?

Place the shim on a clean, flat surface, check level, and secure the component. Use the minimum number needed, stacking only where the product page confirms it is suitable. Trim any protruding material after fixing for a neat finish. Always follow the guidance on the item page for load, placement, and fixings.

Do you leave shims under cabinets?

Typically yes. Once the unit is fixed and level, shims remain in place to support the load. Cut back any excess to the plinth line and check contact points before final sealing.

Durability and strength of plastic packers

Quality plastic is age resistant and designed to resist breakage under normal installation loads. Always review the product’s stated capacity and intended use before ordering.

How much weight can a plastic packer take?

Capacity depends on size, thickness, and support conditions. Check the technical details on the product page and avoid point loads beyond the stated limits. Where higher loads are expected, increase bearing area or choose a heavier-duty option.

Are plastic packers structural?

No. They are installation aids used to level and support during fixing. For structural applications, consult an engineer and use system-approved components.

Why buy plastic packers from EWI Store?

We stock a practical range with clear colour coding, multiple sizes, and dependable delivery. You can sort, view, and compare products online, then add the right qty to your basket and place your order with confidence. If your project ties into façade works, see our rendering tools and beads and mesh to complete the setup.

Shop plastic packers and shims online

Browse the range, select the thickness and sizes you need, and check stock and delivery times at checkout. Our team can help you choose the ideal option for your project if you have any questions about suitability or installation.