---
title: "Join Two IKEA Rast Dressers Into a Wide Sideboard"
canonical: "https://simplyklassichome.com/how-to-join-two-ikea-rast-dressers-into-a-wide-sideboard/"
author: "Arden Vale"
published: "2026-07-02T00:06:18+00:00"
modified: "2026-10-07T08:55:37+00:00"
language: "en-US"
site: "Simply Klassic Home"
description: "Figuring out how to join two IKEA Rast dressers into a wide sideboard requires more than just pushing them together. The particleboard construction means…"
categories: "DIY Furniture Makeovers"
attribution: "Simply Klassic Home (https://simplyklassichome.com/)"
---

# Join Two IKEA Rast Dressers Into a Wide Sideboard

Figuring out how to join two IKEA Rast dressers into a wide sideboard requires more than just pushing them together. The particleboard construction means you need mechanical reinforcement to prevent wobbling or separation over time. Simply aligning the units leaves gaps that ruin the custom look you’re aiming for.

 

You’ll want a seamless appearance, but standard hardware often fails on this specific material. Our research indicates that using 30mm to 40mm wood screws with pilot holes is critical for holding power without splitting the board. Let’s break down the visual and structural steps needed to get it right.

 

## Why Text Instructions Fail for RAST Joins

 

IKEA provides assembly guides for individual units, not combined structures. This creates a significant gap in user knowledge when attempting modifications. The Rast dresser relies on cam locks and dowels designed for vertical stacking or standalone use.

 

These connections do not account for lateral stress applied when joining two sides.

 

Text-only advice often suggests gluing the panels together. This is ineffective for several reasons. Particleboard has low surface energy, meaning adhesives struggle to bond properly without extensive preparation.

 

Even with sanding, the joint remains weak against shear forces. If you push the sideboard, the glued seam will likely crack within months.

 

Visual cues are essential here because alignment errors compound quickly. A millimeter of misalignment at the front edge becomes a visible gap at the back. You cannot correct this by tightening screws later.

 

The geometry of the box frame demands precise spatial awareness during the initial dry fit. Without seeing the internal bracket placement, users often drill into drawer runners or compromise the unit's stability.

 

Furthermore, the back panel is merely a thin hardboard sheet. It offers zero structural rigidity. Joining two units directly via their side panels ignores the lack of internal bracing.

 

You need to visualize where support beams should sit to distribute weight evenly across the new composite structure. Ignoring this leads to sagging tops and failed joints.

 

## The Critical Geometry: Aligning Sides and Back Panels

 

Getting the geometry right starts with understanding the Rast dimensions. Each unit is approximately 80cm wide and 45cm deep. When placed side-by-side, you create a 160cm span.

 

This width exceeds the natural stiffness of the top particleboard sheet. Without intervention, the center will bow downward under load.

 

You must align the outer faces perfectly flush. Use a straightedge or a laser level to check this before drilling any holes. Even slight deviations at the base will cause the tops to diverge significantly.

 

This makes finishing the seam nearly impossible. The goal is a continuous plane from left to right.

 

Consider the back panel interface. Since the backs are loose-fitting hardboards, they don’t lock together. You need to decide whether to remove them entirely or reinforce them internally.

 

Removing them exposes the raw edges of the side panels. This looks messy unless you plan to add a backing board anyway. Keeping them allows for easier cable management but hides potential misalignments until it’s too late.

 

Internal clearance is another geometric factor. Drawer slides occupy space near the front corners. Drilling horizontally through the side panel risks hitting these metal components.

 

You need to map out safe zones for fastener insertion. Typically, the middle third of the side panel height is safest for horizontal screws. Avoid the top and bottom 10% to preserve structural integrity and avoid interference.

 

Finally, think about floor unevenness. Most rooms aren’t perfectly flat. If one leg sits higher than the other, the joined units will twist.

 

This torsional stress breaks joints faster than vertical loads. Always shim the legs individually before joining the frames. Verify levelness in both directions (front-to-back and side-to-side) prior to final assembly.

 

## Step-by-Step Visual Assembly Guide

 

### Phase 1: Dry Fit and Laser-Level Alignment

 

Start by assembling both Rast units completely according to IKEA instructions. Do not attach the back panels yet if you plan to access the interior for reinforcement. Place the units side-by-side on your intended location.

 

Ensure there is no debris between the mating surfaces.

 

Use a carpenter’s square to verify that the adjacent sides are parallel. Push the units together firmly. Check for gaps at the top, middle, and bottom.

 

Any gap larger than 1mm needs correction now. Adjust the feet on each unit independently until the fronts are flush.

 

Once aligned, clamp the units together temporarily. Bar clamps work best as they apply pressure perpendicular to the joint. Tighten gradually to avoid crushing the particleboard edges.

 

With the units held tight, mark the positions for your connecting hardware. Use a pencil to draw lines where brackets or screws will go. This ensures symmetry and prevents guessing later.

 

Verify again that the top surfaces form a single plane. Run a long straight ruler across the junction. If it rocks, loosen the clamps and adjust the leveling feet.

 

Repeat this process until the rock is gone. Only then proceed to drilling. Rushing this step guarantees a wobbly final product.

 

### Phase 2: Internal Bracket Placement Diagrams

 

For robust joining, external screws alone are insufficient. You need internal corner braces or steel L-brackets. Position these inside the cabinet cavity, hidden from view.

 

This maintains the clean aesthetic while providing strong mechanical linkage.

 

Identify four key mounting points per unit. Two near the top rear corner and two near the bottom rear corner. Drill pilot holes first.

 

Use a bit slightly smaller than your screw diameter. For 3.5mm screws, use a 2.5mm bit. This prevents the particleboard from splitting.

 

Insert the L-bracket against the inner face of the side panel. Secure it with short wood screws. Ensure the screws do not penetrate through to the exterior finish.

 

Next, position the corresponding bracket on the adjacent unit. Pull the units together tightly. Mark the hole locations on the second unit’s inner wall.

 

Remove the brackets and drill the matching pilot holes on the second unit. Reattach the brackets. Now, bolt the two brackets together using machine bolts and nuts.

 

This creates a rigid connection that resists pulling apart. Alternatively, use heavy-duty furniture connectors specifically designed for joining cabinets. These offer a cleaner look than exposed bolts.

 

Check the alignment once more after installing the brackets. The joint should feel solid with no play. Tap gently on the side; it shouldn’t flex.

 

If it does, tighten the bracket bolts further. Loose brackets defeat the purpose of reinforcement.

 

### Phase 3: Sealing the Seam and Finishing Touches

 

With the structure secure, focus on aesthetics. Fill any remaining micro-gaps with wood filler matched to the Rast color. White Rast units require white filler; pine veneer needs stainable putty.

 

Apply sparingly with a putty knife. Overfilling creates bumps that are hard to sand flat.

 

Let the filler cure completely. Follow the manufacturer’s drying time guidelines. Usually, this takes 2 to 4 hours depending on humidity.

 

Once hard, sand the seam lightly with 220-grit sandpaper. Feather the edges outward so the repair blends seamlessly into the surrounding surface.

 

Wipe away all dust with a tack cloth. Inspect the joint under raking light. Shadows reveal imperfections invisible in direct light.

 

If you see ridges, sand again. Patience here pays off in the final look.

 

Apply a coat of primer if painting. Then, match the original finish. For painted models, spray paint gives the smoothest result.

 

Brush strokes can highlight the seam area. Allow adequate drying time between coats. Finally, reattach the back panels if removed earlier.

 

Your sideboard is now structurally sound and visually unified.

 

## Common Visual Mistakes That Ruin the Look

 

Misjudging the clamp pressure is a frequent error. Too little pressure leaves gaps; too much crushes the soft particleboard edges. Look for indentations along the joint line.

 

These dents are permanent and difficult to fill convincingly. Always use protective pads between clamps and wood.

 

Ignoring the grain direction matters for veneered Rast models. Pine veneer has distinct growth rings. Joining two units might mismatch the pattern continuity.

 

While unavoidable, acknowledge this limitation. Some users accept the break in flow; others try to rotate units, which isn’t possible with fixed drawer orientations. Plan expectations accordingly.

 

Skipping pilot holes leads to split sides. Particleboard crumbles easily under torque. If you drive screws directly, the head sinks unevenly, creating a crater.

 

Patching these craters looks amateurish. Always pre-drill. It adds minutes to the job but saves hours of repair.

 

Poor lighting during inspection causes missed flaws. Dim room lights hide shadows and gaps. Move the unit to a well-lit area or use a portable work light.

 

Shine it sideways across the surface. This technique highlights every bump and dip. Fix issues before applying finish, not after.

 

Lastly, rushing the curing time of adhesives or fillers. Painting over wet filler traps moisture. This causes blistering or peeling weeks later.

 

Respect chemical timelines. Test a small patch if unsure. Premature handling ruins the durable bond you worked to create.

 

## Hardware Specs and Material Compatibility Table

 

Selecting the right hardware ensures longevity. Below is a breakdown of recommended specifications for joining Rast units. Note that particleboard holds screws differently than hardwood.

 

Depth and diameter matter significantly.

 

| Component | Specification | Purpose | Warning |
| --- | --- | --- | --- |
| Pilot Bit | 2.5mm – 3.0mm | Prevents splitting | Do not exceed 3.5mm |
| Wood Screws | 30mm – 40mm Length | Secures brackets | Avoid piercing drawers |
| L-Brackets | Steel, 2-inch min | Internal reinforcement | Rust-proof coating preferred |
| Wood Filler | Paintable/Acrylic | Seam concealment | Match color exactly |
| Clamps | Bar or Pipe | Holds alignment | Use padding to protect finish |

 

Using screws longer than 40mm risks penetrating the opposite side or hitting internal mechanisms. Stick to the recommended range. For brackets, galvanized steel resists corrosion better than plain zinc-plated options, especially in humid environments like bathrooms or kitchens.

 

Acrylic wood fillers shrink less than solvent-based alternatives. They also accept paint well. Oil-based fillers may yellow over time, disrupting the uniform white appearance of standard Rast units.

 

Choose water-based products for consistency.

 

Clamping force should be steady but gentle. Hydraulic clamps offer precision control. Manual screw clamps require careful monitoring to avoid overtightening.

 

Always check the manufacturer’s load ratings for any adhesive used alongside mechanical fasteners. Never rely solely on glue for structural joins in this application.

 

## Safety Anchoring for Combined Units

 

A 160cm-wide sideboard is a tipping hazard. The combined center of gravity shifts higher and wider than a single unit. You must anchor the structure to wall studs.

 

Drywall anchors alone won’t hold the torque generated by leaning or seismic activity.

 

Locate studs using a magnetic finder or electronic scanner. Standard residential spacing is 16 inches on center. Mark these positions clearly on the back panel area before final assembly.

 

Drill through the existing Rast back hardboard into the stud behind it. Use 3-inch lag screws with washers for maximum pull-out resistance.

 

Attach anti-tip straps to the upper rear corners of both units. These metal brackets connect the furniture frame directly to the wall stud. This distributes force across the entire joined structure, not just one point.

 

Verify tension after installation. The strap should be taut but not bending the particleboard backward.

 

Check local building codes for specific anchoring heights. Many jurisdictions require attachment points at least 24 inches from the floor. This ensures leverage protection against child climbing or accidental impacts.

 

Never skip this step, even in low-risk environments. The added mass makes instability more dangerous, not less.

 

## FAQs on RAST Sideboard Conversions

 

### Can I join three Rast dressers?

 

Yes, but stability decreases significantly. Three units create a 240cm span that sags without intermediate support. You’d need a central leg or bracket system underneath the top surface.

 

The joint complexity doubles, increasing alignment errors. Stick to two units for reliability unless you add structural reinforcement beneath the middle section.

 

### Will the drawers still slide smoothly?

 

They will if alignment is perfect. Misaligned sides bind the drawer runners. Check each drawer’s travel path before tightening final screws.

 

If a drawer sticks, loosen the nearest bracket slightly. Realign the cabinet face until sliding is friction-free. Then retighten.

 

Never force a stuck drawer; it damages the plastic glides permanently.

 

### Do I need to remove the back panels?

 

Not necessarily, but it helps access. Removing them lets you install internal L-brackets easily. If you keep them, cut precise holes for bolt heads.

 

This preserves cable management space behind the unit. However, cutting hardboard risks fraying edges. Sand those cuts smooth to prevent snagging wires or fingers during future maintenance tasks.

 

### How do I hide the seam perfectly?

 

Use color-matched wood filler and light sanding. For white Rast units, acrylic caulk works well too. Apply thinly to avoid buildup.

 

Prime the area before painting to seal the porous filler. Two thin coats blend better than one thick layer. Inspect under raking light to catch remaining ridges.

 

Patience here defines the professional finish quality.