Reinforcing Loft floor

[colacharlie]

I have a loft which I want to reinforce the floor. The length is 5250 mm.



Concrete plinth running the full length of the building which is 400 mm Wide. Running Down both Sides of the length of the building there is a 7 by 2 in timber(s).







I'm only using it for basic storage it has no skylights or anything like that so I am wondering if I installed 6 x 2 inch timber - which would be resting on that central concrete plinth and also attached with roof ties onto the 7 x 2 inch beans- could you inform me what the 6x2 inch timbers spacing from each other should be please?

Here's a link to a video I've made on u tube to explain more...

 

[blup]

That could work but the roof load is supported via the purlins by the 7x3's which will also be taking the load of the new loft floor plus humans plus kit etc. So SE calcs might be sensible.

Blup

 

[colacharlie]

Thanks Blup.
Whats an SE calculation bud?

 

[securespark]

Structural Engineer Calculations.

 

[colacharlie]

Ahhh makes sense. Any idea how I find SE calcs Blup?

 

[Justin Passing]

Structural Engineer Calculations. at DuckDuckGo

DuckDuckGo. Privacy, Simplified.

duckduckgo.com

 

[blup]

There a chap on here called @tony1851 who's a struccie and might look at it and say no problem go ahead.
My point as diyer is that the 7x3 beam is taking the load from the rafters via the purlin, which is an sdditional factor. Usually the purlin transfers its load via a central spine wall which obviously can take far more than a 7x3.

Blup

 

[colacharlie]

Thank u Blup and Justin. I've got u buddies. I will contact 'tony' and see what he says

 

[JohnD]

When you say "plinth" I think you mean "reinforced concrete beam"

 

[George_engineer]

It'd be worth the SE so you don't end up using 7x3 timbers...

 

[colacharlie]

When you say "plinth" I think you mean "reinforced concrete beam"

Yes My man