Ceiling joists - graded or not?


7 Mar 2006
Reaction score
United Kingdom
Hi - just had to take a loft ceiling out (long story as to why) and it was 3x2 joists. I'm going to put it back in with 4x2 - does the 4x2 need to be graded (to c16) or can it be ungraded? It'll be supported from a pitched roof with 4x2 rafters, span from front rafter to rear ~ 3.5m, plasterboarded, and will be used for some storage.

Thanks in advance. Matt
Sponsored Links
Urm 4x2 C16s at 400 centres will span 1.93m maximum
Grade C24 will do 2.12m max.

You've removed the existing joists?? If they were 3x2's they sound more like part of a truss rafter and in that case shouldnt be removed without serious temporary support.

Can you post some photos?

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local

Sponsored Links