Hi guys, I am back after a long time away, I want to take the supports out for my current purlins which run from gable to gable, I am going to leave the wood purlins in place but i also want to add a rsj beam to beef it up but i am unsure on the weight or size it should be, the size of the rsj is not a problem but i think the weight would be so if anyone can give me a rough estimation of the weight it would be much appreciated, the length i need to cover is 18ft long, also what dimensions would the srj be. Thanks for any replies Ian
roof purlins rsk possibly?
- Thread starter maximus999
- Start date
Sponsored Links
You need a structural engineer unless you want the roof to fall down, 18ft span will necessitate something like a 254x146 or 305x127. Weight around 40kg/m so around 220kg. As mentioned these are definitely estimates. If an SE specifies columns they could be a whole lot heavier.
G
geraint
would love to know why you think of those sizes......
one exteme to the other.....
Rule of thumb for beam depths innit, depth = 1/20th span, simples! Or least it is if you have all your marbles! 
Sponsored Links
G
geraint
Rule of thumb for beam depths innit, depth = 1/20th span, simples! Or least it is if you have all your marbles!
seems no marbles
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
