Repair guide
How to laminate two plywood sheets for a thicker workbench top
PVA over the whole face, with clamping or screwing pressure every 200mm, gives a laminated top as strong as solid timber. The two things that ruin it are too little glue coverage and too little pressure in the middle of the sheet.
The short answer
Spread PVA over the entire face of both sheets with a notched spreader or roller, bring them together, and apply pressure across the whole area, not just at the edges. A workbench top is a large bonded area and the middle is where clamps cannot reach, so screw through from underneath at 200mm centres, or stack weight over the centre. Use D3 grade PVA if the bench lives in a garage or workshop that gets damp.
- Difficulty
- Moderate
- Time needed
- 1 hour work, 4 hours clamped, 24 hours before machining
- What you need
- D3 PVA wood glue, glue roller or notched spreader, clamps, screws slightly shorter than the combined thickness, cordless driver, damp cloth, circular saw or router for trimming
Laminating sheet goods is less about adhesive strength than about pressure distribution. PVA is more than strong enough, a well made glue line in plywood is stronger than the plies either side of it. What goes wrong is coverage: a sheet glued only around the edges and in a few stripes ends up with hollow sections that drum, flex and eventually delaminate when the bench takes a hammer blow.
Roller or notched spreader application is the fix. You want a wet, even layer edge to edge on both faces, applied quickly enough that nothing has skinned over before the sheets meet. PVA has a fairly short open time, around ten minutes in a warm room, so have everything laid out before you start.
Pressure across the centre is the other half. Clamps only reach 150mm or so in from the edge of a sheet. Screwing through from the underside at a 200mm grid is the simplest answer and the screws can stay in permanently; they do not weaken anything and they guarantee the middle is held down.
If the bench will live somewhere that gets cold and damp, step up to a D3 rated PVA. Standard interior PVA creeps in humidity and a laminated top can separate at the edges over a few winters.
Step by step
- Cut both sheets slightly oversize so you can trim the laminated panel square afterwards.
- Check both mating faces are clean and free of dust, and sand off any glue spots or raised patches.
- Lay the bottom sheet on a flat surface and have your screws, clamps and driver ready before opening the glue.
- Spread PVA over the full face of both sheets with a roller or notched spreader, working quickly.
- Lay the second sheet on, align the edges, and slide it a few millimetres to bed the glue.
- Clamp all round the perimeter, then screw through from the underside on a 200mm grid across the middle.
- Wipe squeeze out from the edges before it sets.
- Leave 4 hours under pressure, then 24 hours before trimming and machining the edges.
What to avoid
Do not apply glue in stripes or only at the edges. The unglued middle will delaminate the first time the bench takes a real impact.
Do not rely on perimeter clamps alone for a full sheet. The centre gets no pressure at all.
Do not use interior grade PVA in an unheated garage. It creeps in damp conditions and the laminate opens at the edges.
A full sheet of plywood is heavy and awkward, and the glue gives you about ten minutes, so get help rather than doing this alone. Wear a mask when trimming plywood edges, the dust from the glue lines and the plies is unpleasant.
The full bonding guide
Everything about gluing Plywood to Plywood
Last reviewed 13 September 2026.