One-piece copolymer insulation fixings designed to anchor insulation board to concrete and masonry. Large diameter head prevents pull-through. Minimum embedment depth marker included. Box of 100.
White plastic insulation fixings are the straightforward solution for securing insulation board directly to concrete and masonry substrates. At 8 x 50mm, these one-piece impact-resistant copolymer fixings are designed to hold insulation panels firmly without the need for a separate sleeve or anchor component. If you’ve ever watched a fixing disappear through the face of a board because the head was too small, you’ll understand exactly why these exist.
The large diameter head is the key feature here. It spreads the load across the face of the insulation, stopping the fixing pulling through under pressure or over time. That matters on external wall insulation systems, where thermal board can be thick and relatively soft. Get the head size wrong and you’re just wasting fixings and time.
Where White Plastic Insulation Fixings Earn Their Keep
These fixings are used across a wide range of insulation applications. External wall insulation is the obvious one, but they’re just as useful for fixing rigid insulation to cavity wall reveals, loft hatch surrounds, cold room panels, and internal dry-lining systems where you’re going into a masonry background. Contractors working on new-build and retrofit projects alike will find a use for these on almost every job involving rigid board insulation.
The all-plastic, one-piece construction means there’s no metal path through the insulation layer, which matters when thermal bridging is a concern. It also means no corrosion, which is worth thinking about in damp or exposed conditions. White finish keeps things tidy on visible areas before render or cladding goes on.
The Embedment Depth Marker
The minimum embedment depth marker is a small but genuinely useful detail. When you’re driving fixings into varying substrate depths or working through different board thicknesses, it removes the guesswork. You know when you’ve hit the required penetration depth without having to measure every single fixing. On a big run of insulation, that saves a surprising amount of time.
Supplied in a box of 100, these white plastic insulation fixings suit trade quantities without over-committing you to stock you don’t need. Whether you’re fitting out a single house or working through a run of properties, having a reliable box count makes estimating straightforward. At this price per box, they’re easy to keep on the van as a standard item.
Pro Tip: Always pre-drill into masonry with a hammer drill and the correct diameter bit before driving these in — forcing them cold into hard aggregate can split the shank and leave you with a fixing that looks seated but has no real grip.
These fixings are used primarily for securing rigid insulation board to concrete and masonry backgrounds. Typical applications include external wall insulation systems, internal wall lining, insulated dry-lining over masonry, and cold room or commercial refrigeration panel installation. They work anywhere you need a reliable mechanical fixing through insulation into a solid substrate without introducing a thermal bridge through a metal anchor.
Best For
External wall insulation systems
Rigid insulation board to masonry
Internal dry-lining over solid walls
Cold room and panel fixing
Loft hatch and reveal insulation
Compatible Surfaces
Concrete
Masonry
Dense blockwork
Brick
Key Features
One-piece copolymer construction
Large diameter head prevents pull-through
Minimum embedment depth marker
No metal thermal bridge
White finish
8 x 50mm fixing size
Not suitable for: Not suitable for use in timber or steel frame construction where structural fixings are required. These are not designed for use in soft substrates such as sand-lime render or lightweight aerated blocks without checking the required pull-out values first.
Pre-drill the substrate using a hammer drill and a bit matched to the fixing diameter. Insert the fixing through the insulation board and into the pre-drilled hole, then drive home using a hammer until the head sits flush against the face of the board. Check the embedment depth marker to confirm adequate penetration into the substrate before moving on.
Position the insulation board against the substrate and hold or temporarily support it in place
Mark fixing positions according to the manufacturer's layout pattern for the insulation system being used
Pre-drill through the insulation and into the substrate using a hammer drill and correct diameter bit
Insert the fixing through the insulation and into the drilled hole
Drive the fixing home with a hammer until the head sits flush with the board face
Check the embedment depth marker is fully embedded to confirm correct substrate penetration
Repeat at all marked positions, keeping fixing spacing consistent across the board
What thickness of insulation board will an 8 x 50mm fixing suit?
At 50mm total length, you need to allow for the required embedment depth into the substrate, typically around 25 to 35mm for concrete and masonry. That leaves roughly 15 to 25mm for the insulation board thickness, making these fixings most suitable for thinner rigid boards. For thicker insulation systems, longer fixings would be needed.
Can these fixings be used on external wall insulation that will be rendered over?
Yes, these are commonly used on external wall insulation systems prior to render being applied. The white plastic construction means no corrosion risk, and the large diameter head keeps the board secure during the render application process. Ensure fixing positions and quantities comply with the EWI system specification you are working to.
Manufactured from one-piece impact-resistant copolymer plastic, these insulation fixings are designed to resist the shear and pull-out loads generated during and after insulation installation. The large diameter head distributes load to prevent pull-through in foam and mineral wool boards. The 8 x 50mm fixing size suits a range of standard rigid insulation thicknesses when fixed into concrete and masonry substrates.
Size
8 x 50mm
Material
Impact-resistant copolymer plastic
Colour
White
Construction
One-piece
Compatible substrates
Concrete, masonry
Pack quantity
100
Head type
Large diameter
Size
BO x 100
Product Type
Roofing Products
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