Recently moved into a new house and the builder agreed to build conservatory at cost.

Unfortunately I have fallen out with him before he had screed the floor.

It is 40mm off the house concrete floor level.

I'm happy to do it my self but don't know what to do.

The conservatory is approx 3.5m square.

Do you mix yourself or have it delivered, if so what do I need.

Is that 40mm up to the house concrete level? And will your conservatory have tiles? 'cos if so, you may need to come up a bit less to allow for the tiles?
4omm is quite a lot to do with levelling compound, in fact, far too much. You could mix up some fairly runny cement, (sand and cement, no gravel) and trowel/float it fairly flat. Leave to set for a couple of days, then use levelling compound.
Depends how good you are at using a float.
Alcazar

Yes it is 40mm to the concrete level.

What mix should I use?

Carl,
For you screed in preparation for your final finish this is what you need

Portland to BS 12, class 42.5 or Portland blastfurnace to BS 146, class 42.5. (cement)
Sand: To BS 882.(builders sand)
Proportions (cement:sand): 1:3 – 4.5.
Admixture: Water reducing to BS 5075-1 (if required)

When screeding ensure that you do not screed when the tempreture is below 4 degrees C. ie becareful that it has had time to go off before the cold nights then cover it up. If the screed goes over 80mm in depth you will need reinforcing in it.

Allow adequate tolerances for you final floor covering, so that the final finished floor level is even across new and existing floors.

hope this helps

mitch

dont know whether you have done it yet but why not just put a floating floor in cover concrete with polystyrene then put your wearoc flooring over the top of that, thatll be easier than tying to put a semi dry floor as if you dont know what your doing itll be fun when tables and chairs are getting put in the conservatory

Plus the floating floor will be nice and warm!

So how do I go about a floating floor?

Lots of water :D

sorry..

I could try and explain but will be easier for someone else..

involves laying polystrene like tiles under the concrete..

David

put a layer of thick polythene on to the subfloor, measure the thickness you need as the wearoc sheets are 18mm so you will need sheets of polystyrene that will get you to your deisired height, lay the polystyrene ontop of the polythene and stagger the joints then cover with the flooring allowing for a sall gap around the edge for the flooring to move(floating floor) dont worry about the gap as your skirting will cover this:D

You can buy your floor screed in a bag without worrying about mixes. Many to choose from though. My exhusband is a flooring contractor... this should help you choose.

Sand and Cement Screed.
Ready-to-use cement & sand screed is an ideal screed for flooring and roofing applications. It can be used as ground floor slabs (floating foundations), used on suspended floors, as a topping to lightweight screeds based on perlite or other lightweight aggregates and can also be used as a floating construction over insulation to give acoustic or thermal properties.

Epoxy Floor Screed.
Epoxy Floor Screed is polyamine based epoxy. It has an exceptional resistance to a wide range of chemicals and abrasion. It provides extremely high strength floor topping with excellent resistance to mechanical wear it produces a non-slip floor finish which offers good gripping surface to both vehicular and pedestrian traffic. It can be applied in areas for heavy engineering and chemical plants, in refineries, power plants, paint workshops, battery manufacturing plants and many others.

Anhydrite Screed.
Anhydrite free-flowing and self levelling anhydrite screed designed for easy placement and assured results. Suitable for most commercial and domestic buildings including Hospitals, Prisons, Airports, Shopping Centres, Offices, Hotels, Theatres and Housing. As a levelling layer prior to the installation of floor finishes, Anhydrite screeds are ideal for incorporating thermal and acoustic insulation, underfloor heating and electrical services where required. Although an Anhydrite screed is not suitable as a wearing surface itself or for external or permanently wet areas such as swimming pool surrounds it can be easily finished.

Polymer Screed.
Polymer Screeds have been developed to meet the demand for factory mixed cement:sand screed with the inclusion of a synthetic polymer resin to give increased toughness and bond properties. Polymer screeds are suitable for use on the following bases: Refurbishment work and for thinner, well-bonded screeds over suitable prepared concrete where it is impossible to achieve normal minimum thickness Solid concrete ground floor slabs, Precast concrete units or beams with reinforcement and In-situ suspended floors among others.

Fibre Screed.
Fibre screed has been developed to meet the increasing demand for factory-mixed cement:sand screeds of all mix designs incorporating an even dispersion of polypropylene fibres. The presence of suitable fibres can help to give a more cohesive mix and help control cracking caused by intrinsic stresses. Applications: Fibre screeds are ideally suitable for use in hospitals, offices, superstores, industrial and other applications where there would be a high cost in loss of use through floor failure due to surface cracking of screed. Ideally compatible for use with underfloor heating systems.

Lytag Screed.
Lytag produces lightweight aggregate with applications for drainage and filter media, structural lightweight concrete, floor and roof screeds, arresto beds, sports surfaces and horticultural media. Lytag is a versatile lightweight aggregate that has been manufactured since 1959. It uses fly ash, a waste product of coal burning power stations, as its raw material. Lytag has unlimited applications. Wherever there is a need for an aggregate which is strong, light and consistent then Lytag can provide an ideal solution.

Granolithic Screed.
These have been used for many years in industrial situations and are cement based with selected aggregates. They are extremely hardwearing and will withstand high-pressure hot washing, disinfectants etc.
Tilcon Mortars Truscreed and Truscreed H.D. systems were developed to fulfil the need for factory-mixed high-performance cement:sand screeds suitable for all common floor finishes. Advantages over other specialist site-mixed screeds: Better cement dispersion gives greater and more uniform compressive strength throughout the floor area Factory premixing brings quality control away from the site and into the factory, providing consistent quality materials and accurate proportioning

Ardex ARDIT K15 Screed.
Ardit K15 is an advanced sub-floor smoothing compound. It is virtually tension free and is designed to rapidly level and smooth hard sub-floors prior to applying a floor finish. Ardit K15 can be applied to old sub-floors, e.g. floor screeds and other hard and rigid bases. Ardit K15 can normally be walked on after approximately 2 hours at 20°C and dries and hardens rapidly so that even thick applications are ready to receive floor coverings within one day at 20°C.

Ardex ARDURAPID 35 Screed.
Ardurapid 35 is a special formulated cement for producing a rapid setting and drying floor screed. The mortar is mixed and applied in exactly the same way as normal cement/sand mortar and has a working time of approximately 60 minutes at 20°C. An Ardurapid 35 cement and sand floor screed can be walked on 3 hours after application and is dry enough to receive floor coverings after 24 hours at 20°C. However where the Ardurapid 35 Screed is smoothed immediately after application with Ardit 55 ultra rapid drying self-levelling compound, vinyl and textile floor coverings may be applied in as little as 4 hours.