what weight would a 6x3 timber take

GERMAN ROCKS

what weight would a 6x3 (new) timber take which would be on the shed where they bays are 14 foot wide, meaning the timber would only be 14 ft. bought a hoist and all I really want it for is t hang things off to spray paint. whats the max weight I should be going?

kay 9

Depends on the type of timber, grain, has it knots etc. It could take more weight near the support than in the middle etc. I'm not a mathematician but I'd hazard a guess at approx 250kg to be on the safe side.
Another option is double it.

foxy farmer

Bolt a wider plank to it eg a 14ft length of 9x2 or a 14ft length of flat steel eg 6x1/4.
Some of the timber being sold is very light and has poor strength. If you crack a 6x3 youll make sh1t of a roof bay and the mess will be ugly.

Miname

Wouldn't be worth a monkeys. Why can't you fit a length of h iron?

dodod

C24 stamped timber is stronger the normal timber is c16

patsy_mccabe

All you need to know OP;
http://www.roymech.co.uk/Useful_Tables/Timber/Timber_design.html

As you can see from the Strengths shown, it all depends on the grade of timber used. For example in Bending Parallel to Grain, Grade C14 has a compressive strength of 4.1 N/mm2 while D70 is up at 23 N/mm2.

if you knew the grade of timber you have, you could make an estimate of the timber strength. It's a standard enough calculation then to work out the load it will take at the center of the beam supported at the ends. But you also should take into account the load already on the timber from the roof.

GERMAN ROCKS

Miname wrote: »

Wouldn't be worth a monkeys. Why can't you fit a length of h iron?

the sheets re nailed onto the timber. how then would I attach the sheets to the h iron?

Pkiernan

I wouldnt be hanging more than 20 kgs on a 6x3 spanning 14 foot. Or am I misreading the situation???

foxy farmer

Shorten the span by putting a support leg from the floor up to the middle of the 6x3.

alps

GERMAN ROCKS wrote: »

what weight would a 6x3 (new) timber take which would be on the shed where they bays are 14 foot wide, meaning the timber would only be 14 ft. bought a hoist and all I really want it for is t hang things off to spray paint. whats the max weight I should be going?

Accident waiting to happen. ....get that idea out of your head.....

Miname

GERMAN ROCKS wrote: »

the sheets re nailed onto the timber. how then would I attach the sheets to the h iron?

Can the h iron not just be placed to one side of the rafter. There are sheeting clamps but I haven't seen them used in a while or you could just bolt a timber to the h iron to give you a bite.

RightTurnClyde

GERMAN ROCKS wrote: »

the sheets re nailed onto the timber. how then would I attach the sheets to the h iron?

The right teck screw will go through 4mm of steel so that will do the H iron. As Alps said, forget the timber, stupid accident waiting to happen

Timmaay

patsy_mccabe wrote: »

All you need to know OP;
http://www.roymech.co.uk/Useful_Tables/Timber/Timber_design.html

As you can see from the Strengths shown, it all depends on the grade of timber used. For example in Bending Parallel to Grain, Grade C14 has a compressive strength of 4.1 N/mm2 while D70 is up at 23 N/mm2.

if you knew the grade of timber you have, you could make an estimate of the timber strength. It's a standard enough calculation then to work out the load it will take at the center of the beam supported at the ends. But you also should take into account the load already on the timber from the roof.

Your obviously either a mechanical or structural engineer of some sort also ha? The main point I remember from my degree days is that the moment of inertia for a rectangular beam is proportional to the cube of its height, take a timber of 6x3inch, if you have the choice of making it 6x4 or 8x3inch, the 8x3inch will give you alot more bang for buck than the 6x4. How much the beam will deflect by is also related to the cube of the span, anything to reduce the 14ft will hugely help also!

However being more practical about it, I'd agree with the suggestion to use some steel I beam instead, I beam is going to be alot stronger, a 6x3inch 14ft length of I beam shouldn't be much over 100quid, and you'll be done with it then.