Hi, I would like some advice on the correct joist size for a false ceiling please.
This is for a first-floor bedroom with existing L&P ceiling which is bowed/sagged in the centre (max sag/drop in the middle is 50mm). House is 90 years old, the existing ceiling has been bowed for at least 50 years but is otherwise in good condition, secure and fully insulated in the loft above. I want to install a new flat ceiling with downlights.
Room is 4100 X 3580, so with 50mm wall battens on both long sides of the room to take hanger brackets, the clear span for joists across the width of the room will be 3500. I want to use single layer 1800 X 900 X 12.5 PB with joist centres at 450 and noggins at all unsupported board joints. Also possible two binders over top of joists.
My question is, will 47 X 75 C16 be suitable for these joists. Your help would be appreciated, plus anything you think I might have overlooked. Thanks.
This is for a first-floor bedroom with existing L&P ceiling which is bowed/sagged in the centre (max sag/drop in the middle is 50mm). House is 90 years old, the existing ceiling has been bowed for at least 50 years but is otherwise in good condition, secure and fully insulated in the loft above. I want to install a new flat ceiling with downlights.
Room is 4100 X 3580, so with 50mm wall battens on both long sides of the room to take hanger brackets, the clear span for joists across the width of the room will be 3500. I want to use single layer 1800 X 900 X 12.5 PB with joist centres at 450 and noggins at all unsupported board joints. Also possible two binders over top of joists.
My question is, will 47 X 75 C16 be suitable for these joists. Your help would be appreciated, plus anything you think I might have overlooked. Thanks.