Floor Screeding

1. Floor Screeding

2. Timber battens bedded in sand and cement and set to level using a builders’ square Timber battens bedded in sand and cement and set to level using a builders’ square Timber battens bedded in sand and cement and set to level using a builders’ square Setting out a floor from a datum level Setting out a floor from a datum level Setting out a floor from a datum level Datum Line A datum line is a level line Face up the risers Datum Line A datum line is a level line Face up the risers Datum Line A datum line is a level line Face up the risers Using a builders’ square to set a wooden batten to level from a Datum level which has been run around the room Line the builders’ square up with the datum line and put a mark on the builders’ square The timber batten is then set to level by continuing to check that the mark on the builders’ square lines up with the datum line Using a builders’ square to set a wooden batten to level from a Datum level which has been run around the room Line the builders’ square up with the datum line and put a mark on the builders’ square The timber batten is then set to level by continuing to check that the mark on the builders’ square lines up with the datum line Using a builders’ square to set a wooden batten to level from a Datum level which has been run around the room Line the builders’ square up with the datum line and put a mark on the builders’ square The timber batten is then set to level by continuing to check that the mark on the builders’ square lines up with the datum line

3. Setting out a floor from a datum level Once the battens have been set from a datum line put a straight edge across the battens to check for level Once the battens have been fixed to level you can continue to fill out between and rule off, using a mix of 4 part clean sand and 1 part Portland cement semi-dry sand and cement. Finishing with a float Remove the battens as you progress to lay the floor Always work towards the door

4. Setting out a floor from wooden dots Wooden Dots are bedded onto a sand and cement mix and lined up with the bottom of the skirting boards Skirting boards Wooden dots are fixed to level on a bed of sand and cement to the underside of the skirting boards. Once all the dots have been fixed around the room a screed can be filled in between the dots and ruled off level with the dots. The room can then be screeded from the outside screeds Wooden Dot Screed 50 mm

5. An unbonded floor is where no bond to the concrete base is possible owing to its condition. Minimum thickness is 50mm. There are three systems in which you can put a top layer of a floor onto a concrete base: . Bonded . Monolithic . Unbonded Floor Screed Sand & cement grout Concrete Monolithic floors are laid within 3 hours of the base. Monolithic floors may be laid at a minimum thickness of 20 mm. Bonded Floor Monolithic Floor Unbonded Floor