acrows than 4.85m?

Can I get an acrow prop longer than 4.85 meters?
It's about 5.1 meters from my downstairs floor to the upstairs ceiling I want to prop up, but I may have to pull up those downstairs floorboards and rest it on the earth. I dont trust the upstairs floor to hold all the weight when slipping a new lintel under the beam.
[g]
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george [dicegeorge] wrote:

If you are only propping up the ceiling or roof, the upstairs floor is more than strong enough, trust me, we used them last year, from December to March holding up the roof of an house we had taken the front elevation out of (we had to wait for the bricky to build the downstairs walls, then for calcs for the steel beam over for the wall between downstairs and upstairs, then order the frames.)
Lay a plank inline with the floorboards so that the prop is utilising several joists, and also make sure the bottom of the prop is directly on top of a joist and all will be well.
You can get long acrows but they tend to be unstable
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Phil L
RSRL Tipster Of The Year 2008
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george [dicegeorge] has brought this to us :

Two Acrows? One from ceiling to first floor, then a second one from the ground to underside of first floor with suitable boards to spread weight on all surfaces of contact.
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Regards,
Harry (M1BYT) (L)
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Harry Bloomfield wrote:

Possibly, but i dont want to crack the plaster moulding on the dowsatairs ceiling...
I was hoping someone would have the name of a prop like an acrow but longer.
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In an earlier contribution to this discussion,

Can you not fix two Acrows together, end to end? I'm not sure whether the plates have holes for bolts in them - but if not, you could use G clamps. But - as others have said - that may not be all that stable!
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Cheers,
Roger
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Roger Mills wrote:

That would be a very dangerous option. It is buckling rather than stability in general that is the real problem. The combination of 2 Acrows linked end to end would be far weaker than the rated capacity of the individual Acrow.
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Roger Chapman wrote:

Thanks everyone for the discussion. i've sawed away some plaster from the ceiling using my bosch PMF (as mentioned here a year ago) and fitted an acrow from the downstairs floor to the bottom of a joist of the upstairs floor. I'm not worried about it buckling. I will look at it for a few more days before removing the broken lintel above it (which holds up half the roof)
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