I need to hang some heavy rads on a plasterboard wall. I plan on putting plywood behind the rad. Fixed to the studs. Is that better then 4x1timber. Has anyone used this technique before.
Find where the studs are and fix directly to it. Use a strong magnet to identify where the plasterboard screws are. Draw a vertical line between them all, drill a small hole and it'll either push through into the cavity (if in the wrong place) or push through into timber if in the right place (the stud). Use a quiet drill or hand drill when drilling an pay attention to get a proper feel of what you're drilling in to. Smell the pine, see the plasterboard drill dust change to pine, push only lightly, listen to the sound of the drilling.
Once you've identified where the studs are, use fixings long enough to go all the way through to the stud.
Your heavy radiator is to be made even heavier when filled with water.
Rather than plywood I've used 18mm MDF on numerous occasions for exactly that task. MDF offers better 'anti-pull-out' of the radiator bracket screws and there are no 'spelky' cut edges.
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