What size RSJ?

[SparkyStu]

Sorry but some of the info your giving conflicts a little.. probably cos your still not settled on final details..

You have a suspended floor at one end of your garage!? Sorry im finding it hard to visualise, some form of toilet? or is this attached to the main building? Maybe an internal garage? If so its turning from "just a garage" to a major complication..

You say theres to be a pitched roof on this, but then suggest no ceiling members, will there be roof ties higher up? Or is it in the intension to use this steel beam as the roof support? Or will the pitch have its own independant ridge beam?

Maybe some photos/plans will help?

ps.. you should check with a roller door manufacturer about your idea of external mounting they will know if its possible..

I realise that may have sounded a little strange! It is a "standard" garage (if there is such a thing!) of 7.7m x 4.1m with walls of 3m high to eaves. In the rearmost part, I have made provision for some storage at a height of 2m from floor, extending from rear gable by 2.4m. This will be hung from the side walls aswell. I have allowed a couple of 7x3 joists to sit there for supporting the other joists.

The roof will have a ridge board and rafters in 4x2 holding sterling boards and then a sheet of visqueen followed by profile sheeting. I don't anticipate this will be very heavy and will allow for a couple of mid purlins (in wood) if necessary. There will be no "ceiling joists" as I would like the internal height for storage of well, long things stood upright!!

There are no external buildings attached and no toilet either in or outside the garage!!

Sorry if I didn't explain very well - maybe I still haven't?
I will try and sort out some sort of picture to assist if I can get to grips with doing that on a pc!

 

[Static]

Sorry for delay in response.. busy week..

Ok you realistically have a couple of options as stated before..

1/ Beam full 7.4m length, with a heavy duty lintel over the roller door opening to support the beam point load.. your looking at heavy end 152UC or 203UC for the full length.. problem lies in the overall weight of that beam alone could be 340kg.. making it practially tricky to possition..

2/ "H" frame arrangement with smaller 203x133UBs or there abouts which span the 4m short span about 1m away from the walls at each end and thus the actually lifting support is only 5.4m or so.. overall weight would only be 330kg so similar to the above option but the beams are more manageable sizes and each only would weigh 135kg at worst.. which 2-3 strong can lift ok maybe 4 less than fit guys.. yes this option will need to be at roof eaves level so lower and may be a little more work with padstones etc.. but nothing too major..

You can put a further mid span beam to break the span even more, but you may end up with a fabrication complications and will probably increase the cost..

Anyways sizes are "estimated" as others have said you wont get exact figures from a forum.. this is purely for you to guage some costs

 

[SparkyStu]

Sorry for delay in response.. busy week..

Ok you realistically have a couple of options as stated before..

1/ Beam full 7.4m length, with a heavy duty lintel over the roller door opening to support the beam point load.. your looking at heavy end 152UC or 203UC for the full length.. problem lies in the overall weight of that beam alone could be 340kg.. making it practially tricky to possition..

2/ "H" frame arrangement with smaller 203x133UBs or there abouts which span the 4m short span about 1m away from the walls at each end and thus the actually lifting support is only 5.4m or so.. overall weight would only be 330kg so similar to the above option but the beams are more manageable sizes and each only would weigh 135kg at worst.. which 2-3 strong can lift ok maybe 4 less than fit guys.. yes this option will need to be at roof eaves level so lower and may be a little more work with padstones etc.. but nothing too major..

You can put a further mid span beam to break the span even more, but you may end up with a fabrication complications and will probably increase the cost..

Anyways sizes are "estimated" as others have said you wont get exact figures from a forum.. this is purely for you to guage some costs

Thank you for the replies. I too have had a busy week and only just managed to get back on here. I have priced a 254x146x31kg and I will most likely put one of those at ridge height. I will also be putting one above the door on the inner skin.
From what you have suggested, I expect this will more than cope with the loading I have in mind. Unless you think this would be outrageous of course!!
Just one last point, would this need to be sat on a concrete pad or would the concrete blocks I am using be sufficient? Or for that matter, concrete common brick?

Thanks once again, I fully accept whatever I do is my responsibility!

 

[Static]

Thank you for the replies. I too have had a busy week and only just managed to get back on here. I have priced a 254x146x31kg and I will most likely put one of those at ridge height. I will also be putting one above the door on the inner skin.
From what you have suggested, I expect this will more than cope with the loading I have in mind. Unless you think this would be outrageous of course!!
Just one last point, would this need to be sat on a concrete pad or would the concrete blocks I am using be sufficient? Or for that matter, concrete common brick?

Thanks once again, I fully accept whatever I do is my responsibility!

If you exceed 900kgs on that steel you risk it failing, so be careful.. thats just on the lifting load, so you cant add any roof load etc to it.. do not use the steel as a ridge member as well as a lifting beam!
Could just use an engineering brick as a padstone..