I've been using this free floating self leveling red laser to set up two areas for concreting . one area 3.5 inches average depth for 28 sq/m and the other 7 inches average depth for 35 sq/m . Fortunately this snazzy mount appears to be a very precise micro bubble set up . Once set correctly you can rotate it almost 280 degrees if you set it on a corner like I have . Note you can raise or lower it over 200mm from top to bottom .which is handy if you are setting up work tops etc .
I made a simple height measure type device using some gash guttering , giving it a finished height and then GZ 1 & GZ 2 for the level of the hard core by putting the toe end on the concrete base the current office stands on ( this will be the finished height of all the concrete Then measured off 3.5 inches and 7 inches above the base line , graduated it above and below the base every inch using dividers and a fine point Sharpie pen .
Doing the leveling at night .....the red laser was fantastic .
After few checks with the guttering staff & a tarmac rake upside down to level the final 6mm grit over the bases , I realised that if I put a band of yellow insulation tape on the shaft of the rake for each different depth, I could dispense with guttering and just use the rake as I already had the set level indicated on the vertical rake shaft , where the laser struck the tape . It certainly speed up the final fine tough levelling's.
This new laser mount also allowed me to check the levels of the form work done by two hired in ground workers last week . They adjusted my original spirit level set pegs by raising the forms an inch & an 1/8th higher , saying my work was out .
Strangely enough using the laser & snazzy mount I found four places where their heights were camel humps ...... ...an inch and an eighth higher than mine and one that was 3/4 of an inch below mine .
This is between 10 feet from the laser head and 36 feet away .
The deviation won't matter much as the concrete fill is going to be a pumped fibre glass strand reinforced mix . Just got six or so special home made supported ( sandwiched between gash roof line plastic soffit boards ) 10 mm foam expansion joints to put in place tomorrow , with the help from the guy who is going to oversee the pour and float leveling .
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