4 Metres of Wardrobe Fitted with Hettich Quadro Runners on a Sloped Ceiling

Reading the pitch before cutting panels

A sloped ceiling sets a changing height along the wardrobe run. With a coombed ceiling on a typical 40 degree pitch, the plasterboard often meets the wall at roughly 900 mm to 1200 mm above the floor, leaving less than a metre of usable wardrobe height at the low edge and rising to full height toward the apex. A 4-metre run crossing that line usually becomes three or four carcasses, each with its own height.

Take the pitch angle before ordering panels. A digital angle finder held against the plasterboard reads within 0.5 degrees; a spirit level with a protractor gets close enough for cutting. Mark ceiling height every 500 mm along the wall, since plasterboard fixed to rafters is rarely straight and a 15 mm dip across 4 metres will show as a gap above any square carcass. Low carcasses suit drawers and pull-outs. Full-height doors work where the ceiling clears about 1900 mm, which in most loft conversions is set well back from the low wall.

Drawer systems under the low side

Hettich Quadro V6 runners are full-extension ball-bearing runners rated to 30 kg per pair in the 550 mm length. The Silent System soft-close cartridge takes over the closing action through the last 40 mm of travel. For a wardrobe drawer filled with folded knitwear or heavy denim, that 30 kg rating gives usable headroom.

The runner sits as an undermount fitting, hidden below the drawer box, so the sides remain clean when the drawer opens. This matters on low units, where the drawer fronts are often the most visible part of the run.

Drawer box width has to include runner clearance. Quadro undermount runners need 42 mm total between the drawer side and the carcass wall, about 21 mm each side, so the internal drawer box is cut 84 mm narrower than the carcass internal width. Front-to-back depth follows runner length: a 550 mm runner suits a 600 mm deep carcass with the drawer front sitting proud.

The mounting holes need either the Hettich drilling jig or a marked template. The front locating pin and the rear hook must align to within about 1 mm, since a small error makes the soft-close cartridge fire early. On the low-side carcasses below the pitch, drawers carry the design, because a hinged door would hit the ceiling before opening 30 degrees.

Blum Legrabox uses a different geometry. The drawer side is the runner: a steel box side in heights from 90 mm, N, up to 240 mm, F, with BLUMOTION soft-close built into the cabinet profile. Load ratings reach 40 kg or 70 kg according to runner specification.

The visible steel side gives a flat interior with no drawer-box side thickness consuming width, useful in a narrow low-side carcass where every 10 mm matters. The cost and setup are higher. Legrabox needs the Blum boring pattern for cabinet profile screws and front fixing brackets, while the TIP-ON handleless version adds a mechanical push-latch that needs a 3 mm reveal around the front. In a 4-metre run that mixes full-height door cabinets with low drawer stacks, some builders use Quadro for deep utility drawers and Legrabox for shallow shirt drawers, where the thin steel side has a visible advantage. Mixing the two systems causes no structural problem; it adds parts and drilling jigs to the bench.

Keeping 18 mm panels square

Cam lock fittings such as the Hafele Rafix 20 or Hettich VB 36 type pull two panels tight through a cam housing set into a 20 mm blind hole and a connecting bolt driven into the edge of the mating panel. Turning the cam 90 degrees draws the bolt head into the housing and clamps the joint. In an 18 mm melamine-faced chipboard panel, the housing centre sits 9.5 mm from the panel face, and the bolt enters the panel edge on the same centreline. If that centreline wanders, the panels sit proud of each other.

In a wardrobe carcass, cam locks take the horizontal shelves and the base-to-side joints where dowels by themselves would rack under load. A 32 mm system drilling pattern keeps the cam holes on the standard line-boring grid, allowing the same holes to accept shelf supports if the internal layout changes later. Two cam locks per shelf joint is standard on a 600 mm wide carcass; a 900 mm wide low-side unit needs three. Tighten the connecting bolt by hand with a screwdriver. Excess torque strips the chipboard core and leaves the joint loose under the drawer load it was meant to carry.

For hidden vertical face joints, glued dowels in an 8 mm x 30 mm pattern at 96 mm centres do the alignment work, while the cam locks supply clamping force. The pairing resists racking across a 4-metre span, where one out-of-square carcass can push every drawer front to one side and make the reveals visibly uneven along the run.

Fixing the run to the material behind plaster

The wall behind a loft wardrobe is usually plasterboard over timber studs or dot-and-dab plasterboard over blockwork. These substrates need different fixings. A 5 mm x 70 mm woodscrew that reaches solid timber will hold a carcass fixing under any realistic load. A plasterboard-only fixing such as the Fischer DuoPower or a metal spring toggle carries much less when it lands in the void between studs, and stacked drawers can pull the top of the carcass away from the wall over time.

Find the studs with a detector, mark them, and place the carcass top fixings into timber wherever spacing allows. Dot-and-dab walls create a separate problem: the plasterboard can sit 10 mm to 30 mm off the block on adhesive dabs, so a standard frame fixing spins in the cavity. The Fischer FID 50 or a similar dot-and-dab-specific anchor bridges that gap by expanding against the block behind. For a floating shelf inside the wardrobe holding handbags or shoe boxes, concealed shelf anchors with a 100 mm steel rod need a stud or a proper cavity fixing, since the leverage on a 250 mm deep floating shelf can multiply the load at the wall face by a factor of two or three.

Hinges where the pitch clears the door

Where the pitch clears 1900 mm, full-height doors can use Blum CLIP top BLUMOTION or Hettich Sensys hinges. Both are soft-close concealed hinges bored into a 35 mm cup hole set back 3 mm to 6 mm from the door edge.

Crank selection matters near a sloped ceiling. A zero-crank, full overlay hinge lets the door cover the carcass side fully, while a door close to the pitch may need its opening angle restricted to 95 degrees so the top corner does not strike the coombing as it swings.

The shallow triangle

Twin-slot shelving uprights, the standard 32 mm slot-spacing type, can be screwed to wall studs in the shallow triangle where the ceiling falls below carcass height and a full box makes little sense. Brackets clip into any slot, and the shelf depth can taper to follow the pitch.

A 4000 mm span worked through

Take a 4000 mm wall where the ceiling meets the left side at 1050 mm and rises to 2400 mm at the right. Split the run into four 1000 mm bays. Bay one, at 1050 mm, becomes a low chest of three Quadro drawers, each 300 mm high internally, with no door. Bay two, where the ceiling reaches about 1450 mm, takes two deeper drawers below a short hanging rail for folded trousers.

Bay three, clearing 1850 mm, carries a full drawer stack with a single shelf above it on cam locks. Bay four, at 2400 mm, becomes a full-height hanging cabinet with a Sensys-hinged door and a larder-style pull-out at the base for shoes.

Cut each carcass side to its recorded ceiling height. The 15 mm dip found during measuring means bay one and bay four are unlikely to share a clean top line. Scribe the top edge of each carcass to the plasterboard with a compass scribe, then cut on the bandsaw or with a tracksaw guided along the scribe line.

The drawer fronts across bays one and two read as one continuous horizontal band, so runner heights have to come from a single datum line struck across all four carcasses with a laser level. A carcass sitting a few millimetres high makes the front reveals step at the joint.

The unresolved part is the dead triangle above the low drawers: useful volume, awkward reach, and a shape the hardware list alone cannot settle.