Description
The grid 16 disc is the coarser of the two abrasive grades Renders World stocks for the Dedra DED7767, sold by the manufacturer code DED7767G16 and fitted to the same head as every other working disc in the range.
What the Grid 16 Disc Fits and What It Is For
A grid 16 sanding pad for render float work fits the Dedra DED7767, a 710 W machine turning a 390 mm backing disc at 110 rpm, so surface preparation runs at machine speed instead of by hand. It is stocked in the Renders World power float and finishing sponge range as the coarser grade of the two abrasive discs offered for that machine.
The Dedra DED7767 render float is described by its manufacturer as a plaster machine whose job changes with the disc fitted to it: floating and smoothing lime-gypsum plaster, taking unevenness out of existing plaster, stripping wallpaper, clearing mortar squeeze-out from between bricks and lifting dried plaster off concrete floors. An abrasive disc belongs to the removal end of that list rather than the finishing end.
Two grades are sold here, 16 and 24. Abrasive grading numbers run inversely to particle size as a matter of trade convention, which places 16 as the coarser cut and the first disc on the wall where there is real material to take off.
What the Manufacturer Document Confirms — and What It Does Not
Honesty about sourcing is worth more than a full specification table on a consumable like this. The Dedra manual for the host machine was fetched in full this session, and it lists three purchasable accessory discs by code: DED77671, DED77674 and DED77675. The abrasive grid discs are not among them.
| Point | Position after this audit |
|---|---|
| Fitting method | Confirmed — working discs attach to the machine's backing disc by hook-and-loop |
| Host machine data | Confirmed — 710 W, 110 rpm, 390 mm backing disc, S2 15-minute duty |
| Listed as a manufacturer accessory | No — the manual's accessory list names three discs and no abrasive grade |
| Disc diameter | Not published — no document states it, and the machine's own disc is 390 mm |
| Abrasive gradation as a specification | Not published — 16 is the grade the product is sold under, not a figure read from a document |
| Fitment to other machines | Not published — no document addresses it either way |
That gap is the single most useful thing this page can tell a buyer, because it turns one question into a phone call rather than a return. Confirm the disc diameter against your machine's backing disc when you order, and the fitment question is closed before the pad leaves the shelf.
Why Operators Keep a Coarse Disc on the Van
- Same head, no adapter: every working end in the range mounts to the machine's backing disc on hook-and-loop, so changing grade is a matter of pressing one disc off and another on.
- Machine speed on removal work: at 110 rpm the DED7767 is a float rather than a sander, which keeps a coarse disc controllable against a wall.
- A wearing part, priced as one: the manual treats the abrasive disc as consumable and names a worn disc as the cause of poor sanding performance, so keeping a fresh one on the van protects the day's output.
- Stocked beside the machine it serves: Renders World carries the host machine, the grades and the finishing discs together, so a replacement arrives on the same order as the rest of the job.
Using the Coarse Grade on the Wall
Assembly and start-up follow the machine manual exactly, and all of it happens with the tool unplugged. Getting the first two steps right is what keeps the disc running flat rather than cutting on an edge.
- Fit the backing disc to the spindle pin, matching the hole to the shape of the pin, and tighten it with the screw supplied.
- Press the abrasive disc onto the backing disc so the hook-and-loop engages evenly across the face.
- Start the machine horizontally and off the surface, holding the lock-off button on the left of the main handle before pressing the switch.
- Let it reach full speed before touching the work, then guide it in semi-circular movements with pressure matched to the task.
- Work from a stable stance, feet slightly apart and the torso leaning in a little, which is how the machine's torque is absorbed by the body rather than the wrist.
Two limits from the same manual shape the session around the disc. The machine is rated S2 15 minutes, so work in spells with a cool-down between them, and it is an IP20 tool to be kept out of damp — both easy to plan for, and both worth knowing before a full elevation is committed to a single afternoon.
Protection and Dust When Stripping a Surface
Full protection makes coarse abrasive work straightforward, and the manual's own pictograms set the list. The tool carries mandatory symbols for reading the manual, eye protection, respiratory protection and hearing protection, the last of these because the machine's declared sound power level is 94.4 dB(A).
- Respiratory protection is not optional on this machine, which matters more on removal passes than on floating, since abrasive work makes airborne dust rather than paste.
- Know the coating before stripping it. Paint of unknown age on an older UK property is worth identifying first, and where it cannot be identified, a specialist assessment is the sensible route rather than a coarse disc.
- Keep the vents clear as you go. The manual singles out the motor air inlets as very important and names clogged vents as the cause of overheating.
Judging Wear and Getting Full Life From a Disc
One instruction covers most of it: check the abrasive disc before every start and work only with serviceable working ends. The manual's fault table gives a worn abrasive disc as the cause of low sanding effectiveness, which is the signal to change rather than to lean harder.
- Falling cut rate is the wear indicator, and pushing through it costs finish quality on the surface rather than winning back time.
- Store discs flat and dry so the hook-and-loop backing stays clean, since a contaminated backing is what stops a good disc seating properly.
- Clean the machine after each job, clearing residue off the body, the vents and the switch as the manual instructs.
- Keep a spare grade on site, because the refinement pass wants a different disc rather than a tired coarse one.
Grid 16 or Grid 24: Choosing Between the Two Grades
Both discs work the same stage on the same machine and are chosen by grade, which makes this the only genuine like-for-like comparison in the range.
| Disc | Grade as sold | How to choose between them |
|---|---|---|
| DED7767G16 (this disc) | 16 — the coarser of the two | The first pass where there is material to remove |
| DED7767G24 | 24 — the finer of the two | The refining pass, or the only pass where little has to come off |
Neither grade appears in the manufacturer's accessory list, so the table compares them on the grade they are sold under rather than on published specifications. Where the surface only needs bringing back rather than taking down, the grid 24 disc is the one to start with, and the Renders World guide to power float techniques and tool selection covers how the stages run together.
Is This the Right Disc for Your Preparation Work?
- Removing old coatings and unevenness from existing plaster: squarely inside the machine's stated purpose, with the coarse grade taking the first passes.
- Bringing a surface back before a new coat: a good fit, with the finer grade following to refine what the coarse disc opens up.
- Preparing a wall that then takes a basecoat: the material stage after preparation sits in the EPS adhesives basecoats range, and the reinforcing layer specification belongs there rather than here.
- Anything the machine manual does not cover: abrasive work on insulation faces and similar substrates is not addressed by any document read for this page, so ask before ordering rather than assuming.
- A machine other than the DED7767: no document confirms fitment elsewhere, so check the backing disc dimensions first.
Where the work is plaster preparation on the DED7767, the coarse grade is the disc to start with, and it is worth ordering alongside the finer one so the second stage is not waiting on a delivery. For the finish that eventually goes over the prepared wall, Renders World stocks the silicone render range and the EPS adhesives basecoats that precede it.
FAQ — Fitment, Grade Choice, Wear and Limits
Which machine does this disc fit?
It is sold for the Dedra DED7767, whose working discs attach to a 390 mm backing disc by hook-and-loop. Because no manufacturer document states the abrasive disc's own diameter, confirming it against your backing disc before ordering is the one check worth making.
Should I order grid 16 or grid 24?
Order the coarse grade where there is material to remove and the finer grade to refine what it leaves, or the finer grade alone where the surface only needs bringing back. Most full preparation jobs use both in sequence.
How many discs will a job take?
No manufacturer figure exists for disc life, so no coverage or lifespan claim appears here. In practice the substrate decides it, and the honest planning approach is to start a large elevation with a spare on site rather than to work to a number.
How do I know when to replace it?
The manual asks for the disc to be checked before every start, with only serviceable working ends used, and it names a worn abrasive disc as the reason sanding effectiveness drops. A cut rate that no longer recovers after cleaning is the change point.
What should this disc not be used for?
The machine's stated purpose is plaster work and the removal of coatings and unevenness, and it must be kept out of damp conditions under its IP20 rating. Anything beyond that scope is not covered by the documents read for this page, and the Renders World team will confirm suitability before an order goes out.
Technical Documentation — Host Machine