Description
Timber frame, steel sheet and cement board carry insulation on a screw rather than a hammer-in plug, and the screw needs a bearing face. The TD60 support washer is that face, stocked at Renders World in the EWI insulation fixing accessories range and supplied as a bag of discs on their own.
What Universal PVC Discs TD60 Fix, and to Which Substrates
Universal PVC discs TD60 are 64 mm support washers that Klimas declares for fixing mineral wool, EPS and XPS insulation to timber, OSB, fibre cement board and steel sheet substrates with a separate screw.
The data sheet is specific about what counts as an acceptable substrate: OSB wood-based panels, fibre cement boards, steel sheet S280GD and structural timber of grade C22 or better. Masonry is not on that list, which is the whole reason this washer exists alongside the hammer-in plug ranges. Klimas also states that the washer carries an integrated plug that reduces the spot thermal conductivity of the fixing — the cap is part of the collar, not a separate item to buy.
- On the board — the 64 mm plate is the bearing face the screw head cannot provide on soft insulation, and the sheet's method is to tighten until the washer sits faced with the insulation.
- On the substrate — one washer covers timber, OSB, fibre cement board and steel sheet, so a mixed-substrate elevation stocks a single disc reference and varies only the screw.
- On the certificate — the fastener holds National Technical Assessment ITB-KOT-2019/0913 edition 1, declared for the washer used with the Klimas screws the sheet names, rather than for a bag of discs in isolation.
Why Specifiers Choose the TD60 Washer on Timber and Steel
- A cap built into the collar — Klimas states the integrated plug reduces the spot thermal conductivity of the fixing, so no separate cap is ordered to close each head.
- One washer, every board thickness — the sheet's selection table runs from 30 mm to 190 mm of insulation against a single washer reference, with only the screw code changing.
- An assessed fastener — the assembly is covered by ITB-KOT-2019/0913, which is what allows a specifier to place it against a declared anchorage depth rather than a rule of thumb.
- No pre-drilling — the sheet states that drilling holes beforehand is not necessary, because the screw is threaded for use in timber or steel.
- A 100-piece bag — the pack matches the fixing count of a small elevation at the densities Klimas recommends, which keeps quote-stage arithmetic honest.
TD60 Technical Specifications From the Klimas Data Sheet
| Property | Value |
|---|---|
| Sheet designation | TD-060 / TDP-060 |
| Manufacturer | Klimas Sp. z o.o. (Wkręt-met) |
| Plate diameter | 64 mm |
| Collar material | Polyamide PA or polypropylene PP, as declared |
| Screw material | Galvanised steel, supplied separately |
| Declared insulation | Mineral wool, EPS polystyrene, XPS polystyrene |
| Declared substrates | Timber grade ≥ C22, OSB, fibre cement board, steel sheet S280GD |
| Integrated plug | Yes, on the support washer |
| National Technical Assessment | ITB-KOT-2019/0913 edition 1 |
| Pack quantity | 100 pcs |
Two naming points are worth settling before a specification goes out. The Klimas size chart lists the product as 60 mm while the technical data table declares a plate diameter of 64 mm — the first is the code designation, the second is the measured plate, and 64 mm is the figure to use for bearing area. Separately, the pack is listed on this site as PVC while the sheet declares the collar as polyamide or polypropylene; where the polymer matters to a system holder, confirm it with us at order rather than reading it off the product name.
How to Install TD60 Discs on a Timber-Frame or Steel Build-Up
Klimas sets the sequence out in six steps, and the first one is a substrate decision rather than a tool. Identify the substrate — timber, fibre cement board or steel sheet — and select the fastener to suit it, because the screw changes with the material behind the insulation even though the washer does not.
- Identify the substrate and select the matching fastener before any board goes up.
- Choose a screw length such that the threaded part sits in the structural material of the wall.
- Work to the sheet's minimum length rule, Ld = tfix + heff — insulation thickness plus the anchorage depth in the substrate.
- Set the number of fasteners per square metre from the thermal insulation design for the project.
- Drive without pre-drilling; the screw is threaded for timber or steel.
- Tighten with a screw gun until the support washer is faced with the insulation.
Anchorage depth is where the sheet rewards a careful read. Steel sheet from 0.50 mm to 1.25 mm is fixed therethrough, so the gauge sets the screw rather than an embedment figure. Fibre cement board takes a declared anchorage depth of 12.5 mm. For C22 timber and for OSB the sheet declares two depths each, tied to the screw type used, and the pairing is confirmed against the sheet or the assessment at order — no arithmetic here produces it. The full method, including substrate assessment on site, sits in the EWI fixings installation guide.
Choosing the Screw: the Klimas Selection Table by Insulation Thickness
The washer is sold on its own, so the screw is the buyer's decision — and Klimas publishes the mapping rather than leaving it to be derived. Every row below uses the same TD-060/TDP-060 washer; only the screw reference changes with thickness and substrate.
| Insulation thickness | Steel sheet ≤ 0.88 mm | Steel sheet > 0.88 mm | Timber, OSB, fibre cement board |
|---|---|---|---|
| 30 mm | WDB-48050 | WSR-48050 | KDHT/KDH-05060 |
| 40 mm | WDB-48060 | WSR-48060 | KDHT/KDH-05070 |
| 50 mm | WDB-48070 | WSR-48070 | KDHT/KDH-05080 |
| 60 mm | WDB-48080 | WSR-48080 | KDHT/KDH-05090 |
| 70 mm | WDB-48090 | WSR-48090 | KDHT/KDH-05100 |
| 80 mm | WDB-48100 | WSR-48100 | KDHT/KDH-06110 |
| 90 mm | WDB-48120 | WSR-48120 | KDHT/KDH-06120 |
| 100 mm | WDB-48120 | WSR-48120 | KDHT/KDH-06140 |
| 110 mm | WDB-48140 | WSR-48140 | KDHT/KDH-06140 |
| 120 mm | WDB-48140 | WSR-48140 | KDHT/KDH-06160 |
| 130 mm | WDB-48160 | WSR-48160 | KDHT/KDH-06160 |
| 140 mm | WDB-48160 | WSR-48160 | KDHT/KDH-06180 |
| 150 mm | WDB-48200 | WSR-48200 | KDHT/KDH-06180 |
| 160 mm | WDB-48200 | WSR-48200 | KDHT/KDH-06200 |
| 170 mm | WDB-48200 | WSR-48200 | KDHT/KDH-06200 |
| 180 mm | WDB-48200 | WSR-48200 | KDHT/KDH-06200 |
| 190 mm | WDB-48200 | WSR-48200 | — none listed |
Read the table as the manufacturer's own pairing and confirm it against the current sheet before a bulk screw order, since the codes step in pairs and one row's screw often serves two thicknesses. Renders World supplies the washers rather than the Klimas screw ranges, so the screws come from a fastener supplier against these references.
How Many TD60 Discs per Square Metre, and What a 100-Pack Covers
Klimas gives fixing counts by wall zone and building height rather than one number, and states plainly that the recommendation does not replace a thermal insulation design.
- Polystyrene up to 15 m from the ground — minimum 6 per m² in the middle area of the wall, 8 per m² in a corner area.
- Polystyrene above 15 m — minimum 8 per m² mid-wall and 10 per m² in corner areas.
- Mineral wool — each of those figures rises by 2 per m² in every zone.
That converts cleanly into pack arithmetic. At the lightest declared density, 100 discs ÷ 6 per m² = 16.6 m², so one bag covers roughly 16 m² of mid-wall on a low-rise polystyrene job; at the corner-zone density, 100 ÷ 8 = 12.5 m². A wool elevation on the same wall works at 8 and 10 per m², giving 100 ÷ 8 = 12.5 m² and 100 ÷ 10 = 10 m². Zone-by-zone layout, and how corners and openings change the pattern, belong with the fixing pattern and spacing guide, and the length side of the same question is worked through in the fixing length calculation guide.
Ordering TD60 Discs: Pack Price and What to Add
Renders World lists the 100-piece bag at £13.00, August 2026, shown in stock at the same fetch. Per fixing point that is £13.00 ÷ 100 = £0.13 per disc, before the screw.
- Screws — one per disc, galvanised steel, chosen from the selection table above against thickness and substrate.
- Quantity — take the area of each zone, apply the density for that zone, then divide by the hundred discs in a bag.
- Caps — none needed; the plug is integrated into the collar.
Is the TD60 Disc Right for Your Build-Up?
- Insulation on timber frame, OSB, cement board or steel sheet — the declared application, and it takes the graphite EPS insulation boards range across the thickness span of the selection table.
- Wool systems on a framed substrate — the sheet declares mineral wool as well as polystyrene, so slabs from the mineral wool insulation range are in scope at the higher fixing densities.
- Plinth and below-DPC work — the sheet also names XPS polystyrene, which covers the plinth and below-DPC boards where the substrate behind them is framed rather than solid.
- Masonry walls — brick, block, concrete and stone are outside this sheet's substrate list and perform best with the hammer-in plug ranges in the EWI fixings and accessories collection, where plug and disc come as one component.
- Trade schedules — the Renders World desk will size disc quantities against zone areas and densities before an order is placed.
FAQ — TD60 Coverage, Compatibility and Ordering
Are screws included in the 100-piece pack? No. The bag holds washers only, and the screw is chosen against insulation thickness and substrate from the Klimas selection table. That separation is the design intent: one washer reference covers 30 mm through 190 mm of insulation.
How many discs will an elevation take? Work zone by zone, since the declared densities differ across a single wall:
- Measure mid-wall and corner areas separately.
- Apply 6 or 8 per m² for polystyrene below 15 m, and 2 per m² more for wool.
- Divide the total by the hundred discs in a bag, and confirm against the project's insulation design.
Can TD60 discs be used on a masonry wall? The declared substrates are timber grade C22 or better, OSB, fibre cement board and steel sheet S280GD, so masonry sits outside the sheet. On brick or block, a hammer-in plug with an integrated disc is the right specification and the one covered by its own manufacturer's instructions.
Does the fixing need a separate cap to close the head? No, and this is where the TD60 differs from a plug-and-cap arrangement. Klimas states the support washer carries an integrated plug that reduces the spot thermal conductivity of the fixing, so the head is closed as the washer is driven.
What screw length does my build-up need? The sheet's rule is Ld = insulation thickness + anchorage depth in the substrate, with steel sheet fixed therethrough and fibre cement board declared at 12.5 mm. For C22 timber and OSB the anchorage depth is declared per screw type, so read the pairing off the current sheet before ordering screws in volume.
Technical Documentation for the TD60 Disc
- Klimas TDP-060 product page and TD-060/TDP-060 data sheet download — substrates, installation method, technical parameters, selection table and assessment reference, fetched August 2026.