Unite sandwich panel screws
Sandwich Panel Screws for Wood and Timber Substructures
Choose the right sandwich panel screw for timber
Use our sandwich panel screws for timber and wood substructures when you need a fastening designed specifically for sandwich panel build-ups rather than a general sheet-to-wood screw. This family is built around a reduced drill point for strong pull-out values in the substrate and a larger thread under the head for secure sealing against the outer sheet.
On this page, we keep the focus tight on the timber-based solution. That makes it easier to compare the right screw length for the panel thickness, decide whether a standard or stainless option is the better fit, and move faster without mixing this range up with the nearby light steel, heavy steel or concrete alternatives.
Two clear routes in our sandwich panel to wood range
EA11 standard C3 screws for timber-backed sandwich panels
Choose our EA11 range when you are fastening sandwich panels into timber and the project calls for a straightforward C3 solution. This subgroup covers panel thicknesses up to 300 mm, so it is the practical choice for many standard timber-based wall and roof panel build-ups where panel thickness mainly determines the screw length.
See sizes and panel ranges for our EA11 sandwich panel screws on page 29 in the catalogue.
EA31 stainless A2 screws for more demanding environments
Choose our EA31 stainless A2 range when corrosion demands are higher or the specification clearly points to a stainless solution. This range starts with shorter options for thinner panels and continues up to panels below 300 mm, which makes it the better fit when the environment matters as much as the build-up itself.
See sizes and panel ranges for our EA31 stainless sandwich panel screws on page 29 in the catalogue.
Detailed sandwich panel to wood data in our catalogue
The catalogue below is the fastest way to compare panel thickness ranges, screw lengths, corrosion classes and material choices for this exact family. It keeps the focus on sandwich panels to timber, so you can review the timber-specific solution without drifting into the neighbouring steel or concrete pages.
Start on page 29 to compare the EA11 and EA31 ranges side by side. If you are weighing standard versus stainless, or checking whether the length is right for the panel build-up, this is the page that should drive the decision.
Need help choosing the right sandwich panel screw for timber?
We help contractors, installers and technical buyers choose the right solution based on panel thickness, substrate and corrosion requirement. If you are unsure whether the standard EA11 range is enough, or whether the EA31 stainless option is the better call, we can help you narrow it down before you order.
How do I choose between the EA11 and EA31 ranges?
Start with the environment and corrosion requirement. The EA11 range is the standard C3 route for sandwich panels to timber, while EA31 is the stainless A2 route when the project needs a more corrosion-resistant solution. After that, match the screw length to the panel thickness shown in the range table. For the broader corrosion logic, it is worth linking this page to our corrosion classes guide.
Why does the panel thickness range matter so much on this page?
Because this family is organised around the panel build-up. The visible range is not just a list of random lengths. It is there to help you choose a screw that suits the panel thickness you are working with and still gives the right fastening logic into timber. For supporting explanation around build-up and length thinking, link naturally to our clamp length guide.
When is the stainless EA31 option the better choice?
The stainless EA31 option is the better choice when the project environment or specification pushes you away from a standard carbon-steel solution. In practice, that often means you are not only choosing a screw for timber, but also choosing for a more demanding corrosion situation where a stainless A2 product is the safer route.
Why do these sandwich panel screws use a reduced drill point and a larger thread under the head?
Because this family is designed specifically for sandwich panels to timber. The reduced drill point is there for strong pull-out values in the timber substrate, while the larger thread under the head helps create secure sealing against the outer sheet. Those details are part of what separates this family from nearby sandwich panel screws for steel or concrete.
When is this not the right sandwich panel page?
This is not the right page when your substrate is light section steel, heavy section steel or concrete instead of timber. Those situations have their own sandwich panel families and should not be mixed into this page just because they sit on neighbouring catalogue pages. If your project includes mixed substrates, we recommend linking out to the correct family page rather than forcing one solution to cover all of them.