what is the reccomended size joist for a 5 meter span

wrote:
what is the reccomended size joist for a 5 meter span

5.5 metres

Phil L wrote:
wrote:
what is the reccomended size joist for a 5 meter span

5.5 metres

What's it carrying? - a roof? - an upper room? a ceiling?

What's it sitting on? - a wallplate? steel beams? dwarf walls?

wrote in message
...
what is the reccomended size joist for a 5 meter span

If you are talking about a floor, ie lots of joists side by side.

In imperial, the rules of thumb is:- depth of joist in inches = half the
span in feet+2

So half of 16' is eight plus two =10" deep. (ie 50mm x 250mm)
Assuming 2" joists @ 16" centres.

For domestic loads only.

It will need two rows of braces to prevent disortion.
Joist offcuts, timber herringbone or metal strutting.
Last can be bought and is easiest by far.

Might be more convenient to have an RSJ down the middle and smaller joists
cut into it @ rt angles.

On 09/06/2014 16:54, wrote:

what is the reccomended size joist for a 5 meter span

Depends on what loading you are sticking on it...

A quick set of calcs in Superbeam suggest:

For a normal floor with a uniformly distributed load of 0.8 kN/m on the
joist, long term load configured for load sharing (i.e. more than 4
joists in total), you would need a 50x220 timber with a C24 spec.

If you want to use C16 timber, then you would need a 75x220 timber to
meet building regs specs.

--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

John Rumm wrote:
On 09/06/2014 16:54, wrote:

what is the reccomended size joist for a 5 meter span

Depends on what loading you are sticking on it...

A quick set of calcs in Superbeam suggest:

For a normal floor with a uniformly distributed load of 0.8 kN/m on the
joist, long term load configured for load sharing (i.e. more than 4
joists in total), you would need a 50x220 timber with a C24 spec.

If you want to use C16 timber, then you would need a 75x220 timber to
meet building regs specs.


The timber dimensions are specified in the building regulations, or at
least they are in my very old copy! John's figures are pretty similar,
but you may be able to get away with 50 x 200 if using SS timber and the
loading is low enough. Harry's suggestion of an RSJ may well be the
easiest solution, 203 x 133 seems about right for a span of 6M.

On 09/06/2014 22:04, Capitol wrote:
John Rumm wrote:
On 09/06/2014 16:54, wrote:

what is the reccomended size joist for a 5 meter span

Depends on what loading you are sticking on it...

A quick set of calcs in Superbeam suggest:

For a normal floor with a uniformly distributed load of 0.8 kN/m on the
joist, long term load configured for load sharing (i.e. more than 4
joists in total), you would need a 50x220 timber with a C24 spec.

If you want to use C16 timber, then you would need a 75x220 timber to
meet building regs specs.


The timber dimensions are specified in the building regulations, or
at least they are in my very old copy! John's figures are pretty
similar, but you may be able to get away with 50 x 200 if using SS
timber and the loading is low enough. Harry's suggestion of an RSJ may
well be the easiest solution, 203 x 133 seems about right for a span of 6M.

Another option if you want to get the height down is a flitch beam...

--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

snip

Another option if you want to get the height down is a flitch beam...



--

Cheers,



John.



/================================================== ===============\

| Internode Ltd - http://www.internode.co.uk |

|-----------------------------------------------------------------|

| John Rumm - john(at)internode(dot)co(dot)uk |

\================================================= ================/

Never heard them called that before. I usually think of them as laminated or engineered beams.

Was just thinking about making up a ramp for loading a lawn mower into a trailer and was considering making one up out of something like this.

A flitch to me is a side of bacon !

On 10/06/2014 10:11, wrote:
snip

Another option if you want to get the height down is a flitch beam...

Never heard them called that before. I usually think of them as laminated or engineered beams.
Was just thinking about making up a ramp for loading a lawn mower into a trailer and was considering making one up out of something like this.
A flitch to me is a side of bacon !

;-)

Flitch seems to be a fairly common term for a pair of wood beams bolted
side by side with a thin steel plate between them. However they may well
be regional variations.

Picture of the end of one with a 8mm plate he

http://www.internode.co.uk/loft/images/shoe1.jpg


--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

wrote in message
...
what is the reccomended size joist for a 5 meter span

Oh and use metal joist hangers, don't build into the wall. Much
better/quicker/easier solution.