Slab Levelling rods and optional nuts.Two purposes.
A much easier and better system for a basement slab costs £7 for a 2m rod that you cut into several lengths and whole nuts £2.20 each.
A basement floor slab always gets covered in insulation and screed because building regulations say so. Therefore you want it flat and level. It does not need to be a pretty finish.
18mm diameter threaded rods made with fibreglass. You only need to get a long drill bit through the steel. We suggest 2m centres.
Most formwork carpenters work with steel threaded rods through plastic tube.
The length of the plastic determines the wall thickness so the tubes are cut to that length.
The steel threaded rod gets used time and time again.
Cheap for the formwork carpenters .....
But they don't have to fill the holes up.
They don't have to find and cure leaks months later.
What you can see in this photo is a course of timber formwork and the man working for this self builder in the Cotswolds is nailing down a bit of batten between rods because that forms his holes without drilling holes.
A 6mm piece has been cut off the ends of nuts to make thin nuts that are adjusted to the thickness of the wall concrete.
Then the next board will go straight on top.
The boards already up on the inside are screwed to a triangular brace that was screwed to the floor first.
The brace keeps everything upright and in the correct position. The thin nuts keep the wall the correct width.
The best formwork carpenters took years to learn how to use steel threaded rods successfully and they command £300 a day in some places. If you aren't that experienced you will have much more success with my formwork and fibreglass rods.
The most popular way to use nuts is just one nut on each end of the rod and to cut that off with a mini angle grinder and thin blade when the formwork comes down.
Rods. £2.50 per m.
Available mostly in 2m lengths. Also a few at 4m, 800mm and 600mm.
These were £3.50 per m but they are on sale until they have all gone. I have 5,000m or so as at 1.1.2018.
Nuts. £1.50 each.
These were £2.20 per m but they are on sale until they have all gone. I have about 4,000 or so as at 1.1.2018.
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But don't cut the rod and nut off too quickly.
Plan what you do next.
If you have a corbel to form, a concrete roof to pour, or anything else that would benefit if you already have a threaded rod cast securely in the wall below, use 2 nuts so that you can get them both off and use the threaded rod again.