Suspended ceiling quantities: track, profile and hangers

A suspended plasterboard ceiling is only five components, but most first-time orders either come up short on site or arrive with a pile of leftover 3m lengths. The parts themselves are not complicated. The trouble is that nobody tells you how they relate to each other before you start pricing a job. Here is how to work it out properly for a suspended ceiling job of any size.

The five parts and what each one does

Part	Job on site	Comes in
UD 30 perimeter track	Fixed around the wall at ceiling height, carries the edge of the grid	3m lengths
CD 60 profile	The main runners that the plasterboard screws into	3m lengths
CD 60 hanger and levelling bracket	Suspends and levels the CD runner from the slab or joists above	Boxed singles
Ceiling bracket 75mm	Joins cross runners to main runners at a shallow drop	100 per box
Ceiling bracket 125mm	Same job, deeper drop where there is more to clear above	100 per box

Every one of those five has to be ordered against the actual room, not against a rule of thumb, because the room's shape decides how much of each you need.

Start with the perimeter track

This is the easy one. Measure the full perimeter of the room in metres, add a bit for cutting waste on internal and external corners, then divide by 3 (the length each piece of UD 30 comes in) and round up. A small box room with a few corners will use more offcuts than a plain rectangle of the same perimeter, so always round up rather than down.

Then the main runners

CD 60 profile runs across the room at a set centre-to-centre spacing, which depends on the plasterboard thickness, the board orientation and whether it is a single or double layer. That spacing is set by the plasterboard manufacturer's system, not by us, so check the datasheet for the board you are using before you lay out your runners rather than guessing a figure. Once you know the spacing, work out how many runners cross the room, multiply by the room's length, and divide by 3m lengths as before, allowing for the overlap where two lengths join.

Hangers: one per fixing point along every runner

The CD 60 hanger and levelling bracket holds each runner up and lets you level it to the slab or joists above. You need one at every fixing point along every runner, so the quantity scales directly with how many runners you have and how far apart the fixing points are. The fixing spacing is set by the system datasheet and by what you are fixing into (concrete slab, timber joist, steel), so confirm it before ordering rather than assuming the last job's figure applies here too.

Choosing between the 75mm and 125mm brackets

Both ceiling brackets do the same job: they clip a cross runner onto a main runner at a right angle. The difference is the drop between the two. A shallow gap above the main grid calls for the 75mm bracket. More depth to clear, for example ducting or an old light fitting, calls for the 125mm bracket instead. Measure the actual gap on site before you order, rather than assuming one size suits the whole job if the ceiling height varies between rooms or areas.

Finishing the joints

Once the plasterboard is up, tape the joints with plasterboard joint tape and fill with Cekol C-40 plasterboard joint filler. A ceiling shows up every shadow under raking light from a window or a row of downlights, so take the time to get the taping flat rather than rushing it because it is "only a ceiling".

Worked example: a 4m x 3m room

Part	Calculation	Order
UD 30 perimeter track	Perimeter 14m, plus waste	5 lengths
CD 60 profile	Depends on spacing from your board's system datasheet	Confirm spacing, then calculate
CD 60 hangers	One per fixing point per runner	Count fixing points on your layout
Ceiling brackets	One per cross-runner junction	Count junctions on your layout
Joint tape and filler	Based on total joint length once boarded	Order once boarding is confirmed

The perimeter track is the one figure you can nail down before you even order the rest, because it only depends on the room's walls. Everything else follows once you have confirmed the spacing from the board system you are using.

Send us your measurements

If you would rather not do the maths yourself, send us the room dimensions, the ceiling height you are working down to, and the plasterboard system you plan to use, and we will put together a full materials list: perimeter track, CD profile, hangers, the right brackets, tape and filler, with nothing missing and nothing left over. Call 085 868 8459 or email sales@all4building.ie and we will get back to you with a list and a price.