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Advantages of Traditional sand / cement based screeds


Traditional floor screed is mixed at a factory for both flooring or roofing and gives excellent cement dispersion, with greater compressive strength over the total floor area. It also stays workable for anything up to 12 hours. Super strong screeds, perfect for use in offices, industrial settings and even hospitals, have been created to meet the growing demand for sand and cement screeds incorporating polypropylene fibres. These fibres improve the cohesion plus also control any potential cracking caused by stresses.


Fast drying high density screeds are perfect for most common floor finishes and allow the floor space to be used alot earlier. It is easy to work, provides a higher strength and scratch resistant finish, and can be used on a wide variety of bases. The High Density floors are extremely effective on floors subject to alot of work or traffic and provide good sound insulation, thermal insulation and weight reduction applications. SBR Polymer Modified screed has increased toughness and bond properties thanks to the inclusion of a synthetic polymer resin.


It minimises shrinkage or cracking, permerability is reduced and flexural strength is improved. These screeds can provide greater performance in thinner applications when normal thickness could appear to be problematic.

The Advantages of Flowing Screed


Flowing screed has a number of benefits worth considering.

  • It has a high quality surface finish that reduces cracking and curling.
  • A reduced need for construction joints or reinforcement.
  • It is ideal for use in all warm water underfloor heating applications.
  • Foot traffic can start within 24 to 48 hours and partitions constructed 7 days after installing.
  • Great compressive strengths up to CA25F4/mm (BRE Test Category A to Bs8204) BSEN 12813.
  • Up to 2000m squared can be installed every day.
  • Environmentally friendly product. Does not harbour bacteria due to being protein free.
  • Reduce thickness means greater weight saving.
  Minimum Thickness

Bonded

= 25mm

Unbonded over a solid base

= 35mm

Minimum

= 30mm

Floating over thermal or solid insulation

= 40mm

Cover over donduits or heating pipes minimum

= 30mm

Maximum Thickness

= 80mm

Flowing Screed vs Sand & Cement


  Flowing Screed Sand & Cement

Productivity

Easily up to 2000m per day
Average 500-1000m per day
100 - 150m per day

How quickly can you walk on the floor?

Within 24-48 hours
No curling needed
Not to be walked on for 7 days
Required covering and curing

Joints

30-40 linear meters. Following building construction joints Laid in small bays of between 5-7 linear meters

Performance

Very Low Shrinkage
Very Low Shrinkage
Very Low Shrinkage
Shrinks
Cracks
Curls

Surface Finish

Achieves SR2 under BS 8204 Dependant on contractor
Curls and cracks at joints

Average Drying Times

1mm per day up to 40mm
Dependant on site conditions
11 weeeks at 75mm thickness
Dependant on site conditions

Compressive Strength


Flexural Strength

28 days > 30N/mm


28 days > 8N/mm
28 days > 10-20N/mm


28 days > 1N/mm

Quality Control

Produced under BS EN 13454 Mixed on site by hand
Poor Quality Control
Labour Intensive
Inconsistent Quality

The Benefits of Underfloor Heating Systems


  • Insulated profile of the floor panels reduced the volume of screed on the floor to provide a system with low thermal mass, producing better and faster transfer of heat.
  • Fast and effective Installation.
  • Economical and environmentally friendly.
  • Energy efficient.
  • Silent and invisible system - integrated safely within the floor.
  • Stable heat profile - reduces unwanted air movement and dust circulation plus the occupied area of the building is heated.
  • Healthy and hygenic.
  • Low maintenance - embedded within the floor, maintenance is simple and removes the need for complicated and often dangerous servicing of other systems at a high level.
  • Suitable for a wide range of buildings from large industrial warehouses, to smaller residential homes
  • Hard wearing - able to withstand high static and dynamic loads.
  • Strong fixing clips secure the pipes in the perfect position to ensure full encapsulation within the screed or concrete.
  • Pre-formed grid ensures accurate placing of pipes.

Flowing Screed - The Process


  • Sub-base, clean and clear of any loose debris. Lay polythene and fix perimetre edging strip.
  • Tape down all joints and pvc apron on perimeter edging strip to ensure there will be no grout loss.
  • Set-up floor levels using self levelling lazer and thread level indicators.
  • Flow test material.
  • Pour flowing screed to desired level (following thread level indicators.)
  • Remove tripods.
  • Finish and close surface using dappler bars.
  • Finished floor.