Description
This EPS 200mm is the deepest board in the Renders World graphite range: grey polystyrene, 1000 × 500 mm on the face and 200 mm through, made for external wall insulation that is finished in render. It is the size to reach for when a wall has to hold in as much heat as one layer can manage and the building has room for the extra depth. It belongs to the graphite board range, eleven thicknesses that share one face size from 20 mm up.
Each sheet of EPS 200mm covers 0.5 m², with a declared thermal conductivity of ≤ 0.031 W/mK.
EPS 200mm: What You Get
Every sheet is 200 mm thick and 1000 × 500 mm across. Graphite is blended into the polystyrene during manufacture: it gives the EPS its grey colour and lowers its thermal conductivity, so a full 200 mm of it insulates better than the same depth of plain white polystyrene.
| Property | Declared value |
|---|---|
| Thermal conductivity λD | ≤ 0.031 W/mK |
| Reaction to fire | Class E |
| Thickness tolerance | T1 (± 1 mm) |
| Length and width tolerance | L2, W2 (± 2 mm) |
| Squareness | S5 (± 5 mm per 1000 mm) |
| Flatness | P5 (5 mm) |
| Bending strength | BS100 (≥ 100 kPa) |
| Tensile strength perpendicular to the faces | TR100 (≥ 100 kPa) |
| Dimensional stability, normal conditions | DS(N)2 (≤ 0.2 %) |
| Dimensional stability, set temperature and humidity | DS(70,-)2 (≤ 2 %) |
Class E is the reaction to fire of the EPS on its own. A finished, rendered wall is assessed as one system, and the system specification sets its fire performance. To turn 200 mm into a U-value for your own wall, work through the U-value and insulation thickness guide.
The 200 Is the Thickness
“EPS 200” is also the name of a polystyrene grade, rated by how much load it takes and sold as flat sheets for floors. This product is something else:
- the 200 is the depth of the sheet in millimetres, and the sheet is a façade board for walls;
- it carries no load grade and is not made to go under a screed, under a slab or into the ground.
Foundations, the plinth and other work below ground or in lasting damp call for a foundation board. Renders World sells those as separate products, and the deepest of them is the 100 mm foundation board.
Why Choose a 200mm Graphite Board
- The most insulation in one layer. EPS 200mm is the thickest size in the range, fixed in a single pass with nothing stacked behind it.
- Low conductivity through the full depth. ≤ 0.031 W/mK across 200 mm of graphite polystyrene.
- One face size for every depth. The thinner sizes you use in reveals and returns share the same 1000 × 500 mm face, so the courses stay in line.
- Tight tolerances. ± 1 mm on thickness, 5 mm on flatness and 5 mm per metre on squareness keep a deep layer even under the mesh.
- Strong enough for the render coats. At least 100 kPa in bending and 100 kPa pulled at right angles to the faces.
- Stable once it is up. Size change in normal conditions stays at 0.2 % or less.
Where a 200mm Board Goes
- External walls insulated by the bonded-and-rendered method or the light-dry method, where the roof overhang, sills and openings let the wall grow by 200 mm plus the render.
- Stud walls, fixed to the outer surface.
- Cavity walls, in an enclosed or a ventilated slot that is deep enough to take it.
It can be bonded to concrete, cement and cement-lime plaster, bare brick, block and hollow block in ceramic or silicate materials, and aerated concrete.
With EPS 200mm on the wall, the face comes out a long way, so measure the eaves, the window sills, the downpipes and anything fixed to the wall, such as meter boxes or vents, before the EPS is ordered.
How Many Boards of EPS 200mm to Order
Ordering EPS 200mm comes down to the wall area: count two sheets per square metre. A full pack holds 3 sheets and covers 1.50 m².
- A 24 m² side wall takes 24 ÷ 0.5 = 48 sheets, which is 16 full packs.
- Take the windows and doors off the wall area before you divide.
- Reveals take a far thinner EPS, so put them on the order as a line of their own.
Fitting the Board
Fix the EPS with a cement-based or a polyurethane adhesive; both types are in the adhesives and basecoats for insulation boards. Before you start, the wall must be load-bearing, flat, sound and frost-free, with no dust, dirt, lime, oil, grease, wax, emulsion or oil paint left on it.
- Treat the wall. Where the surface soaks up water fast, or is a weak cement or cement-lime plaster, or rough aerated or cinder block, apply Uni-Grunt priming emulsion. Fill bigger holes and gaps beforehand with ZW 330 mortar or Plastering Mix M, which the shop sells under the name One Coat Dash Cover.
- Butter the back. Lay a closed rim of adhesive at least 3 cm wide round the edge, then 6 to 8 dabs 8 to 12 cm across in the middle. Together they cover 40 % of the back or more, and 60 % once the sheet is pressed.
- Press and level. Push the sheet into place at once; the adhesive behind it must not be thicker than 10 mm. On an even, smooth wall you can comb adhesive over the whole back with a notched trowel instead, for 2 to 5 mm after fixing.
- Ready the face. Before the base coat the EPS 200mm has to be frost-free, flat, clean and firm. Sand graphite sheets and brush the dust off first.
Anchors and mesh come next: see the insulation fixing accessories, the board fixing pattern and spacing guide and the EWI build-up and layers guide.
Keep Graphite Boards Out of the Sun
Graphite EPS reacts to heat and strong sun, so a few site rules apply to every sheet of EPS 200mm:
- Keep it cool while fixing. A sheet that warms up while it is being fixed, or before the adhesive has first set, can pull away from it; shade the wall from the heat.
- Keep the packs wrapped and in the shade. Direct sun can warp graphite boards in storage.
- Work under cover. Hang scaffold sheeting, and stop fixing in rain, snow or strong wind.
After long exposure, to UV in particular, the face can take on a yellowish film; sand it off before the base coat. Solvents such as acetone, nitro thinner and benzene dissolve polystyrene, so keep them off the EPS.
If you are unsure how strong the wall is, run a pull test first: stick 8 to 10 polystyrene cubes of 10 × 10 cm at different spots, wait 3 days and pull them. When the cube tears through itself, the wall holds; when it comes away with adhesive or a skin of the wall, it does not, and the insulation design has to deal with that before the sheets go up.
200mm Among the Other Thicknesses
The range runs from 10 mm up to this 200 mm sheet, and from 20 mm upwards every size has the same 1000 × 500 mm face:
| Thickness | Sheets per m² | Full pack |
|---|---|---|
| 10 mm | 2 | order by the sheet |
| 20 mm | 2 | 30 sheets, 15.00 m² |
| 30 mm | 2 | 20 sheets, 10.00 m² |
| 50 mm | 2 | 12 sheets, 6.00 m² |
| 80 mm | 2 | 7 sheets, 3.50 m² |
| 90 mm | 2 | 6 sheets, 3.00 m² |
| 100 mm | 2 | order by the sheet |
| 150 mm | 2 | 4 sheets, 2.00 m² |
| 160 mm | 2 | 3 sheets, 1.50 m² |
| 180 mm | 2 | 3 sheets, 1.50 m² |
| 200 mm (this board) | 2 | 3 sheets, 1.50 m² |
Nothing deeper than EPS 200mm is made in the range. Whether the wall needs the full 200 mm or one of the thinner sizes is settled by a U-value calculation for the whole build-up.
Ordering, Delivery and Returns
Renders World processes orders the same day when the stock is there.
- Delivery: quoted by the team after the order; parcels up to 25 kg go next day, pallets next day or in two business days on the economy option, always kerbside.
- Collection: from the counter at Unit 9A, Central Trading Estate, Southampton SO14 5JP, Monday to Friday 7am to 5pm and Saturday 7am to 12pm.
- Returns: goods bought directly from Renders World can go back within 14 days in their original condition; special orders and promotion purchases are excluded.
FAQ
What size is one board?
1000 × 500 × 200 mm. One sheet covers 0.5 m², so a square metre takes two.
How many boards are in a pack?
3 sheets, which cover 1.50 m² of wall.
Is EPS 200mm the same as an EPS 200 grade sheet?
No. Here 200 is the thickness of a wall board. For work under a floor choose a sheet made for floor loads; for foundations and the plinth use the 100 mm foundation board.
What is its thermal conductivity?
λD ≤ 0.031 W/mK. The U-value of the finished wall comes from a calculation for the whole build-up.
Which adhesive should I use?
A cement-based or a polyurethane adhesive, laid as a rim and dabs over at least 40 % of the back, no more than 10 mm thick.
How much depth does the finished wall gain?
About 200 mm plus the adhesive and the render coats. Check that sills, eaves and downpipes can be extended or moved before you order.
Is there a thicker board in the range?
No. 200 mm is the deepest size; the next one down is 180 mm.
Technical Documentation