INSULATION FIXING & ACCESSORIES

This shelf holds the EWI fixings an insulated wall needs besides the boards: insulation plugs for polystyrene and mineral wool, base tracks for the first row, support collars for timber and sheet backgrounds, anchors for light items, a cutter and caps for recessed finishes, and foam and adhesive for bonding. It is for installers and self-builders insulating the outside of a UK home.

Renders World sorts these EWI fixings by the job each part does in the wall. Bonding holds the boards, plugs go through them into the wall, and a base track at the foot carries the first row. Our EWI systems range sets out the wider build-up.

Choose EWI Fixings by Wall and Insulation Board

Two facts decide which EWI fixings you need: what the wall is made of and what the insulation is. Find your job in the table and take the part on the same row.

LTX-10 and LMX-10 Insulation Plugs: Matching Plug to Insulation

These are the EWI fixings that pass through the board into the wall. Both come from Klimas Wkret-met in Poland, and each has a polyethylene sleeve and a 60 mm plate and is driven in with a hammer.

• LTX-10 is for polystyrene. It is recommended for EPS and XPS boards and for no other insulation. Its pin is glass-fibre-reinforced polyamide.
• LMX-10 takes mineral wool as well. It suits EPS and XPS, and also mineral wool and lamellar wool, but only with a TDX-90 or TDX-140 pressure plate fitted. Its pin is galvanised steel with the head sealed in polyamide.
• Both suit five kinds of wall. Concrete, solid brick (clay or calcium silicate), hollow or perforated block, lightweight aggregate concrete and aerated concrete.
• Plugs add to the bond, not replace it. They resist wind suction as an extra mechanical fixing and do not carry the weight of the insulation system; the adhesive does. Both are covered by a European Technical Assessment issued in March 2026.

What Sets Plug Length, and How to Drill for It

Length comes from the build-up of the wall. The fixing has to pass through the board, through the adhesive and any old plaster under it, and then reach into the masonry by its full anchorage depth. Add those three and you have the shortest length that works. The end that spreads to grip, the expansion zone, must sit in the wall itself and not in the bond or the plaster. Our guide to working out the length for your wall sets out the sum with real figures, and each size has its own page.

Drilling is the same for both EWI plugs.

• The hole is 10 mm across and at least 10 mm deeper than the anchorage: 40 mm deep, or 60 mm in aerated concrete.
• It must anchor 30 mm into the wall, or 50 mm in aerated concrete.
• In solid walls, clean the hole by moving the drill in and out at low speed four times.
• In hollow blocks and aerated concrete, drill without hammer action. Hammering cracks the inner walls and the hold is weaker.

Base Tracks for the First Row of Boards

A base track is an aluminium profile that protects the lower edge of the insulation, with a drip that sheds rainwater. The base track is the first of the EWI fixings to go on, at the foot of the wall, and the first row of boards starts from it.

• Seven widths in 2.5 m lengths: 23, 33, 53, 83, 93, 103 and 163 mm. A 1 mm track in 93 mm and a 1 mm track in 163 mm sit alongside them.
• To count lengths, divide the run of wall you are starting by 2.5 m and round up.
• Not sure which width suits your boards? Ring the counter on 023 8200 2442 before you order.

TD60 Collars for Timber, OSB and Steel Sheet

Where the background is timber, OSB, plywood, fibre-cement board or steel sheet rather than masonry, the TD60 takes over from the EWI plug. It is a screwed-in support collar, 64 mm across, that sits on the surface of the board, and it is made for EPS and mineral wool.

• On timber the collar goes with a KDH hardened screw, sold here in 5 kg boxes.
• On steel sheet the screw is a different type, so ring the counter on 023 8200 2442 for the right one before you order.

WK-DS Anchors for Light Items on an Insulated Wall

Of these EWI fixings, the WK-DS is the one that carries items rather than insulation: a spiral anchor that screws into a polystyrene-insulated wall, with the item itself fixed on with a 4.5 mm screw.

• Each anchor takes up to 5 kg. For anything heavier, use a different fixing.
• It comes in 50 mm and 85 mm lengths, 10 to a bag.

Recessed Fixings: Hole Cutter and Plug Caps

Recessed EWI fixings sit below the surface of the board and are covered over, which keeps the finish flat. The method is to cut a recess with a polystyrene cutter, set the fixing, and cover it with a polystyrene disc.

• The INSTAR STAR EPS hole cutter cuts the recess in EPS.
• Grey graphite polystyrene caps cover the fixing once it is set.

Fitting Order: Track, Bond, Plug, Finish

EWI fixings go on in a set order, because each step depends on the one before. Our step-by-step installation guide goes through the full sequence.

1. Fix the base track at the foot of the wall.
2. Bond the insulation with foam or adhesive: Ceresit CT84 adhesive foam, Ceresit CT84 XPS foam for XPS, or Thermo Star styrofoam adhesive.
3. Drill where adhesive sits behind the board, set the fixing with its plate flush with the insulation, then drive the pin. Once the pin is in, do not hammer it again, because it can break.
4. Cap any recessed fixings once they are set.

Ordering, Delivery and Returns

• Courier. Renders World sends fixings by courier, next business day on express or in two business days on economy.
• Delivery. After you order, the team contacts you to set out the delivery details.
• Returns. If you change your mind, return the goods within 14 days in original condition. Paper bags, tinted products, promotion and special orders are excluded.

The counter is at Unit 9A, Central Trading Estate, Southampton SO14 5JP, open Monday to Friday 7am to 5pm and Saturday 7am to 12pm. Phone 023 8200 2442.

FAQ: Quantities, Compatibility and Substrate Limits

Order the Right Fixings for Your Job

• Find your row. Take the wall and board from the table, and order the EWI fixings on that row from Renders World.
• Still choosing boards? Compare EPS boards, mineral wool slabs and XPS boards first, since the board decides which fixings suit.