Unilit FenXA Lime Binder For Site Mixed Lime Screeds & Lime Concrete Floors 25Kg

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£9.00
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Quick Overview

newA pure natural hydraulic lime binder designed to be gauged with the correct volume and quality of sand and water to produce in situ floor screeds and lime concrete slabs. 


This is a truly versatile product, by mixing the binder (FenXA) in varying ratios with sand or aggregate a breathable lime floor slab or screed can be cast on site simply with the addition of water and clean washed aggregate. Quick and easy to mix this allows the general builder the option of casting in situ floors where a vapour open but strong floor is required and where the flexible non expanding nature of lime is beneficial.


 Benefits



  • Inexpensive - very cost effective

  • Breathable

  • Simple and easy to cast no specialist equipment required

  • No need for expansion or slip joints

  • Tested and proven

  • Can be used with underfloor heating

  • Very low soluble salt content

  • Suitable for most floor finishes



 


IMPORTANT NOTE


The slaking method used to create FenXA actively reduces the free lime and salt content of the screed or slab,  unlike most other lime products the potential for free lime and salts to effloresce is therefore greatly reduced, this is a key point  to consider installing with solid masonry, flint & chalk or brick walls typically found in older buildings



When used at a standard ratio of 1:3 allow for 1.8 bags /m2 at 125mm depth for a lime screed


 Price is per 25kg bag

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Lime screeds and lime concrete  floors - advantages

Using FenXA natural hydraulic lime binder allows the application of floor screeds to a considerable scale without the requirement for expansion or slip joints. The application of lime screeds will also prevent differential movement between the floor screed and the walls of lime built buildings.

Application without a DPM will allow the floor to “breathe” with moisture from beneath the screed being evacuated through the screed as vapour preventing the build up of moisture below the floor and subsequent movement of salt laden water into the walls. Where stone, paving or tiles are then to be laid over the screed the use of a bedding mortar will ensure the performance of the screed is maintained and the compatibility of the mortar with the stone.

Despite the apparent contradiction it is possible to have a breathing yet waterproof structure by using selected lime products  to 'tank'  please call us if you would like to know more about this and the use of  stabilising plaster used when remediating existing damp issues.

Lime floors can provide major benefits to older traditionally built construction when used as an alternative to DPM & cement concrete floors. By using Lime as the binder in a floor slab and screed the floor is permeable to water vapour allowing it to “breathe” which prevents the build-up of moisture and subsequent movement of salt laden water from travelling in to the lower parts of the adjacent walls.

Since the 1940’s many refurbishment of older properties up and down the country have had replacement cement floor slabs with DPMs installed This has moved moisture to the lower parts of the walls creating a further problem of the effects of rising damp to the surface drying area of the wall plaster, using lime flooring will prevent the same from happening in the future.

 Unilit FEN-XA conforms to European Standard ENV 495-1, NHL 2, 3.5, 5 for natural hydraulic lime mortars.

Technical Summary


Colour: Binder

 Beige

 Colour: Mortar

  From sand

 Packaging

 25 kg bags, in powder form

 Density

 1000 kg/m3

 Tensile strength

 2

 7 N/mm2 after 28 days; 3

 0 N/mm2 after 60 days

 Compressive strength: Binder

 4

 5 N/mm2 after 28 days; 6

 0 N/mm2 after 60 days

 Mortar

 2-9 N/mm2 after 28 days; 10 N/mm2 after 60 days*

 Modulus of elasticity

 6130 N/mm2*

 Volumetric stability

 Stable

Vapour diffusion resistance

 µ= 13.7

 Fire classification

 (Class M O) Non-flammable

 Recommended maximum  aggregate sizing

 4 - 7 mm

* Variable mix strengths can be obtained by altering the mortar mix and aggregate size to suit the application.

 

If in doubt please call us for advice on the suitability of the substrate.

On an existing floor slab or sub-base the screeds are prepared with Unilit 15p2 a bridging layer of natural hydraulic lime.  

No addition of clinker, cements or any other synthetic additives are allowed. 

FenXA  is mixed on site with the selected aggregates.  

For a floor screed the maximum granular sizing will be 4mm to 7 mm. where larger aggregates are used the thickness of the screed should be increased. See Lime concrete below.


FenXA properties

 Specific gravity

 1000 kg/m³

 Moisture diffusion resistance (µ).              

 13.7

 PH-value.                                               

 > 10.5

 Fire resistance classification.                    

 Class M0 (non-flammable)

 Consumption.                                           

 ~ 2.5 kg/m²/cm

 Packing.                                                 

 powder in bags of 25 kg

 
Contact Ecomerchant for advice on waterproofing breathable screeds.

 

Unilit FEN-XA as a lime floor screed

 

A pure natural hydraulic lime binder designed to be gauged with the correct volume and quality of sand and water to produce floor screeds and lime concrete. 

 

It is not permitted to add clinker, cement or any other synthetic binder.

Thickness: depending on the base, application, and aggregates:  50 - 100mm

Mix: The composition of the mortar for the screed layer is:

  • Unilit Fen X A natural hydraulic lime         by volume               1 part
  •  graded sand 0/4 to 0/7mm                                                           3 parts


The mortar is mixed with clean water until a semi-dry, though sufficiently hydrated mortar is obtained. During the levelling of the screed layer with a wooden float a fine layer of lime fat should occur on the worked surface. 

 

Application:
The screed will be laid to a thickness of between 50mm and 100 mm, dependent upon the loads to be applied under use and whether or not an underfloor system of floor heating is being installed. The lime screeds are ruled flat and finished with a wood float. The laid mortar requires drying for 1 to 2 weeks, while regularly being dampened down during conditions of dry weather and high temperatures.


Finish: 

Wood float or lightly keyed for following layers. A wearing coat of Unilit Pedes is recommended for a hard dust free surface. Unilit Pedes is a versatile product with excellent adhesive properties and is also used as a combined adhesive and grout when installing ceramic, terracotta or natural stone tiles onto a FenXA screed

 

Underfloor heating:

The under floor heating system is laid directly on the insulation on mechanically fixed spacers normally supplied by the underfloor heating installer. Following the mounting of the pipes for the heating system, the screed materials are applied in two layers in accordance with the methods and specifications outlined above.  The first layer of the screed is applied to cover the pipes of the floor heating system, while the second layer is applied flat at a minimum thickness of 50 mm. In between the layers a brick mesh, stainless steel mesh or similar reinforcement is introduced to absorb the thermal stresses in the flooring, due to the heating system.

 

UNILIT Fen XA as a lime concrete 

On a substrate of levelled sand, a slab is cast with FenXA a binder of natural hydraulic lime.  No addition of clinker, cements or any other synthetic additives are allowed. FenXA is mechanically mixed on site with the selected aggregates. The maximum granule sizing is to be 7mm to 20 mm, dependent upon the desired compressive strength of the slab.

Contact us for further information on waterproofing breathable lime concrete slabs.

Thickness:  50 to 300mm. 

Mix:
  The composition of the matrix for the structural slab will be:

  • Unilit Fen XA Natural Hydraulic Lime     by volume              4 parts
  • graded sand 0/4                                                                           9 parts
  • rolled gravel 4/7 to 4/20                                                              3 parts

The mortar is mixed with clean water until a reasonable dry, though sufficiently hydrated ground mortar is obtained.  

Application: 

While levelling the surface of the structural slab with a timber rule, a fine layer of lime fat should occur on the worked surface. After the application at a thickness of 50mm to 300 mm, dependent upon the anticipated load to be applied in performance and whether a system of under floor heating is installed, the ground mortar is ruled flat and finished with a wood float. 


Other Requirements: The slab/ground mortar must be allowed to dry for 1 to 2 weeks and benefits from regular dampening down during conditions of dry weather and high temperatures.


Finish:

Wood float or lightly keyed for following layers. A wearing coat of Unilit Pedes is recommended for a hard dust free surface. Unilit Pedes is a versatile product with excellent adhesive properties and is also used as a combined adhesive and grout when installing ceramic, terracotta or natural stone tiles onto a FenXA screed or lime concrete slab.

Underfloor heating:

The under floor heating system is laid directly on the insulation on mechanically fixed spacers normally supplied by the underfloor heating installer. Following the mounting of the pipes for the heating system, the screed materials are applied in two layers in accordance with the methods and specifications outlined above.  The first layer of the screed is applied to cover the pipes of the floor heating system, while the second layer is applied flat at a minimum thickness of 50 mm. In between the layers a brick mesh, stainless steel mesh or similar reinforcement is introduced to absorb the thermal stresses in the flooring, due to the heating system.

 

 

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