ᐅ What mounting methods are available for Ikea Pax to support heavy loads?

RI-TAR schrieb:

I’m specifically interested in how to proceed with a drywall partition – how much can the load capacity be increased, for example, by attaching a plywood or OSB panel for load distribution?

To quantify this, the load-bearing capacity always depends on: - your stud framing (material, spacing, dimensions) - the quality and number of screws - and the strength of the OSB/plywood panel.

As a rough guideline: with an 18mm (0.7 inch) plywood panel securely screwed to a sufficient number of strong wall studs, it is possible to safely distribute loads of about 150–200 kg (330–440 lbs) over several attachment points – provided the installation is done properly using suitable screws into the stud cross-sections. The panel acts as a rigid composite that spreads localized loads over a wider area. Important: each screw should be able to carry at least 20–30 kg (44–66 lbs) without damage. With multiple screws, a multiplication effect occurs in terms of load distribution.

One area to be very careful of is the back panel of the Pax wardrobe – it is relatively thin and barely load-bearing. Therefore, additional reinforcement is recommended, for example with cross braces or metal brackets inside the cabinet, before installing heavily loaded shelves.

If using drywall construction, you can screw directly into the wooden studs instead of using standard drywall anchors. Use OSB boards as a backing; this increases load capacity. Expansion anchors are only necessary for solid walls. This is usually sufficient.

For heavy loads, it is also recommended to add feet at the front of the cabinet to distribute the weight to the floor and not rely solely on the wall mounting.

GiRoyce schrieb:

The panel should be at least 15 mm (0.6 inches) thick, ideally 18 mm (0.7 inches) or more

These thicknesses are recommended for good reason, as thinner panels tend to bend easily and do not provide the necessary stability. In addition, fastening to the studs must be done with suitable screws (e.g., 5x60 mm (0.2x2.4 inches) wood screws) to securely support permanent loads.

Palenar schrieb:

A plywood panel screwed onto enough strong wall studs can safely distribute loads of about 150–200 kg (330–440 lbs) across several fastening points

This is realistic if the entire structure is carefully designed. For higher loads (e.g., heavy boxes, books), additional floor fastening or internal reinforcement (e.g., mid-span braces) is recommended.

Thank you for the many helpful answers! One last question for clarification: Which types of screws are best suited for direct wall mounting? Are stainless steel or galvanized screws better? And how important is the length of the screws depending on the wall type (drywall vs. concrete)? I want to choose the right screws to ensure a secure installation over time.

Regarding screws:
- For drywall construction, it is best to use stainless steel or galvanized wood screws with a strong thread to ensure sufficient grip in the wood studs. A length of at least 60 mm (2.4 inches) is recommended to achieve adequate wood strength.
- For concrete or solid masonry, load-tested heavy-duty screws or steel bolt anchors should be used, combined with appropriate wall plugs. Galvanized or stainless steel screws are also advisable here to prevent corrosion, especially in damp rooms.
- The screws should have a minimum diameter of 5 mm (0.2 inches) to securely hold the load.
- For very heavy loads and critical walls, stainless steel screws are recommended due to their exceptional durability.

In any case, the installation should follow the enclosed recommendations, and the screws should not overstress the wall material. Pre-drilling is often necessary.