Finally got around to ordering a screen to replace the tripod mount one we've been using for the past 7/8 months. It's obviously going on the ceiling and I've been umming and ahhing for ages about how I would secure it. Lifting the floorboards above is not practical and I'm not completely convinced that cavity fixings straight into the ceiling will not give me sleeples nights waiting for the crash! My plan is to secure a bit of wood (18x95x2400mm) into 3 maybe 4 of the joists across the ceiling then secure the screen (8.5kg) into that using Rawl metal self drive fixings (LINK HERE) . The data sheet on the fixing says they're good for 8kg in 12.5mm plasterboard, so I should think 4 of them into the batten and ceiling should prove safe enough? Anyone got any warnings, comments or life-savers before I start screwing??