I've been asked to shiplap an area where one "wall" is the back side of an 8' tall Ikea wardrobe (technically it's one wardrobe and a portion of another). The back panel is flimsy 1/8" hardboard, and the side walls are 18mm (.7") particleboard. The shiplap is 5.5 x .5 pine.
I can think of a few ways to do this, each with drawbacks.
- Brad nails straight into the frame (wardrobe side walls). But I don't really trust the nail holding power of particleboard and a misfire could stick through the side of the panel and be difficult to repair. Probably a nonstarter for that reason.
- Use construction adhesive. But the back panel is flimsy, and I don't think there's a good flat surface for adhesion along the edges.
- Screw some 1x2s (or 2x2s?) into the particleboard frame (from the back) with coarse threaded #8 screws (carefully predrilled), and then nail into those with the Brad nailer. This is my leading option.
When I get to the corner where the shiplap will meet the other wall (already shiplapped into studs in the photo below) I could also theoretically shoot some short brads on an angle to attach the shiplap on the wardrobe to the shiplap that's already installed.
Carpenters of StackExhange, what do you advise?