I’m putting a sheet of 2-sided melamine particle board (which matches my desk) to a sheet of plywood (for strength) to build an electronics workbench. To do this, I’ve bought a construction adhesive which promises a bond strength of 20 lbs / sf.
To clamp the two sheets together, I will be using screws in an 8-inch matrix. The screws won’t be removed after, I will just leave them. I’ve pre-drilled the holes and placed screws in for speed. I plan to tighten the screws in from center outward, so that any excess adhesive has somewhere to exit.
But I’ve never used construction adhesive. I have absolutely no idea how much to use. The container says “coverage: approx 30ft using a 1/4” bead”, which I’m sure I’m misinterpreting.
I think waves make the most sense, but how far apart should they be?
Best Answer
I would run the adhesive bead 1” from the edge and then fill in with lines or waves (shape won’t matter) about 3 or 4” apart.
When putting together I would hold the edges open by 1/8” and work out from the centre as you plan.
You could get a similar result by working from one end along the length tightening from the centre out to the sides and removing spacers as you go - centre sag won’t be an issue as long as you get reasonable clamping. Putting bricks on the surface will help but make sure the support prevents bending.