Specification & Application Guide for Unilit Lime Renders & Plasters Over Cavity Membrane

Transcription

1 Specification & Application Guide for Unilit Lime Renders & Plasters Over Cavity Membrane

2 Contents Page 2, Introduction 3, Traditional aesthetics 4 Cavity Drainage Systems 5-6 Unilit Products for MESHED Membrane 7-8 Unilit lime plaster Specification MESHED Membrane. 9 Unilit on MESHED Membrane section 10 Brick Mesh application Vaults Unilit lime plaster Specification to VAULTED areas using Brick Mesh Over-view Lime is the oldest construction mortar known to man used to bind together a coat walling foams made from stone, brick, straw and earth. Lime is experiencing a renaissance due to the modern methods of production that have erased the common perception that it is an archaic process. Within the next few page we hope to show you how our lime products can be used together with modern day type C waterproofing systems for work in basements, cellars & Under street vaults of Listed buildings and to create a traditional aesthetics even in areas that suffer from high hydrostatic water.

3 Traditional aesthetic created with natural minerals By combining the unique performance of Cavity Drain Membrane with Unilit natural hydraulic lime renders and plasters Telling Lime Products have created a system that has the possibilities of recreating traditional aesthetics with the controlling water ingress under hydrostatic pressure. The primary function of the system is to provide protection of the inhabitants form the effects of flooding in today s rapidly changing climate, as it must also: Create an internal environment that is healthy, air and watertight Meet ever improving standards of performance Offer a pleasing architectural aesthetic within its environment Be made from a sustainable and recycled source Contribute to targets for carbon neutrality Be compatible with modern methods of construction Comply with current national building codes

4 Cavity Drainage System The cavity drainage system uses a high density plastic studded membrane that acts as a lining to the walls, and floors. The membrane has a cavity that forms an air gap behind the membrane this allows for the free movement of water which is collected in to a perimeter drain, this is then channelled into a sump pump allowing the evacuation of the water to suitable drainage outside the building. The cavity membrane comes with or without a thermally bonded mesh depending on the application required. When Lime Plaster is required over MESHED Cavity Membrane Unilit K2 is recommended to provide a guaranteed bond, Fixings are as per Cavity membrane manufacturer s recommendations.

5 Unilit K2 Lime Bonding Coat & Fibre Mesh Application: MESHED Cavity Membrane Unilit K2 Unilit K2 is suitable for application over MESHED Cavity Membrane it is used as a lime bonding coat to provide an optimum bonding bridge between the MESHED Cavity Membrane the following coats of Telling Medium, Unilit 35, or site mixed Fen XA and sand. The Unilit K2 is pushed through the mesh with all dimples filled with 5mm over the face of the mesh it will ensure the adhesion to the membrane and give the ideal surface for the following Unilit plasters. Telling Fibre Mesh The Telling Fibre Mesh is recommended to reinforce over junctions in the background. Telling Corner Bead (3707) Telling Corner Bead (3707) with glass fibre mesh for embedding in the Unilit lime plaster forming reinforcement to edges.

6 Unilit Lime Plaster Products Application: MESHED Cavity Membrane continues Unilit 35M Undercoat Render Unilit 35M is a pre-blended traditional lime render Suitable for application Cavity Membrane when applied over Unilit K2 Basecoat. Or Unilit Fen-XA & Sand Site-mix Followed by Fen-XA is suitable for application as a site-mix under coat render when added 1-3 with a sharp well graded washed sand. Sit-mixed lime render suitable for application over Cavity Membrane when applied over Unilit K2 Basecoat.. Unilit 45 or 47 Finish Plaster Unilit 45 or 47 are both suitable for application over Unilit 35M or Site-mixed Fen-XA Undercoat renders as a lime finish plaster..

7 Unilit Lime Plaster system over Cavity Membrane UNILIT NHL LIME RENDER & PLASTER APPLIED TO OVER MESHED CAVITY MEMBRANE Basecoat: Unilit K2 Basecoat Thickness: Unilit K2: 4 5mm nominal thickness from face of cavity membrane mesh + material behind mesh Basecoat Application: Mix Unilit K2 with clean water to 5.25 litres of water to 30kg of powder depending on the temperature and substrate. Mixing is undertaken with a slow speed electric paddle for a period of 3 to 5 minutes. Depending on thickness and any levelling out required apply keying, priming or levelling coat of Unilit K2 in a nominal 4 5mm layer (maximum 8 mm layer) by Steel trowel, and bring to a level surface with a rule and float. Glass Fibre Mesh Following the application of the base coat a glass fibre mesh is embedded within the base coat (position 2/3 of the thickness away from the substrate) to cover the complete surface. Successive sheets of glass fibre mesh should overlap by at least 100 mm. Additional mesh reinforcement is required around all openings, across zones where suspended floors intersect walls and where panels are applied over different substrates, along continuous straight panel joints and over repaired areas

8 Unilit Lime Plaster system over Cavity Membrane Lime Render Undercoats Undercoats: Premixed natural hydraulic lime mortar Product reference: Unilit 35M. Thickness (excluding dubbing out): 4 5mm nominal thickness Application: Mix Unilit 35M with clean water to 5.25 litres of water to 30kg of powder depending on the temperature and substrate. Mixing is undertaken with a slow speed electric paddle for a period of 3 to 5 minutes. After 1 2 days apply a second 4 5mm layer of Unilit 35M by steel trowel to a completely level surface and finish with open texture for the application of following layers. OR Undercoats: Premixed natural hydraulic lime mortar Product reference: Telling Medium. Thickness (excluding dubbing out): 8 mm nominal thickness Application: Mix Telling Medium with clean water - 4 to 4.5 litres of water to 25kg of powder depending on the temperature and substrate. Mixing is undertaken with a slow speed electric paddle for a period of 3 to 5 minutes. After 1 2 days apply 8mm layer of Telling Medium by steel trowel to a completely level surface and finish with open texture for the application of following layers Lime Finish Coat Fine Finish coat: Premixed natural hydraulic lime finishing mortar. Product reference: Unilit 45 Thickness: 3-4 mm overall, 2 x 2mm layers (wet on wet) Application: Mix Unilit 45 with clean water to 5.25 litres of water to 30kg of powder depending on the temperature and substrate. Mixing is undertaken with a slow speed electric paddle for a period of 3 to 5 minutes. After 3 4 days (or sooner in good weather conditions) apply Unilit 45 manually or mechanically to a dry or damp substrate in 2 layers of 2mm (wet on wet). Finish: Depending on product and desired finish - trowelled, wood floated, sponged. Note: To be applied in accordance with the manufacturer s recommendations - full details are available from Telling. Do not apply in temperatures below 5 C or above 40 C. The mortar remains workable for 2 hours and dries in hours. Protect from frost for 48 to 72 hours.

9 Unilit Lime Plaster system over Cavity Membrane Waterproof Cavity Drain Membrane with mesh fixed with sealed plugs Unilit K2 Lime Bonding coat with Telling Fibre Mesh Pre-blended Telling Medium or Unilit 35M levelling and floating coats Telling Fine, Unilit 45 or Unilit 47 finish coats

10 Unilit 30 screed / Drainage Channel Detail Unilit K2 applied over MESHED cavity membrane Telling Brick Mesh used as Screed reinforcement this is mechanically fixed into position to the existing. Unilit 30 waterproof screed applied between & above perimeter Drainage Channel and existing floor slab to 50mm depth. Existing floor slab 20mm washed stone Drainage Channel used to remove ingress of water to sump pump.

11 Telling Brick Mesh Render carrier for vaults Application over Clear cavity membrane in vaults and other areas Brick Mesh can be applied over clear Cavity membranes fix in to the heads of the brick plug fixings with a stainless screw and washer. This provide a render carrier which prevents the plaster being fully bonded to the membrane like meshed membrane, therefore allowing any retro repair to plugs etc. to be carried out without damaging the cavity membrane waterproofing integrity. Brick Mesh can be applied to areas such as Vaults and other areas currently difficult to waterproof with Meshed cavity membrane. When Brick Mesh is plastered with Unilit 20 or 30 the system can provide either an Insulated or secondary waterproof coat providing a second layer of protection to the full system. Standard plasters can also be applied to areas such as Vaults and other areas currently difficult to waterproof with Meshed cavity membrane. Brick Mesh Superficial reinforcement is a stainless steel wire coated with nodules of clay to ensure fusion of lime to the natural mineral. Substrates that are cracked or suffering from high levels of movement are popular for is a cost effective method of use. Brick Mesh comes on a 6m x 1m

12 Unilit +Brick Mesh to Vaulted Areas of Cavity Membrane M UNILIT RENDER SPECIFICATION Telling Brick Mesh. The use of Telling Brick Mesh, expanded stainless steel mesh coated with nodules of fired clay, is recommended where there is a likelihood of structural movement, and for application over timber framed areas, large voids, suspended ceilings, and differential backgrounds. Telling Brick Mesh is an expanded stainless steel mesh coated with nodules of clay, which are fired onto the intersections of the mesh, to ensure fusion of lime mortar to the natural mineral. The use of Telling Brick Mesh produces a mineral bond in addition to the physical key, ensuring the adhesion of the mortar to the mesh. Telling Brick Mesh can be moulded and shaped for formation of features, cornices and architectural profiles. Stainless steel fixings should be used to ensure the secure fixing of the mesh to the substrate. Telling Brick Mesh is supplied in rolls of 1.05m x 6m, with a nominal thickness of 7mm. Properties/Benefits: Telling Brick Mesh is easily moulded into shape and retains shape/form, saves mortar in comparison to traditional laths, double bonded through mineral and mechanical bonding of plaster, and can be plastered by hand or mechanically. Uses: As a render carrier over cavity membrane to Vaults, Suspended Ceilings. Repair of e.g. Cracks. Stainless steel lathing, Restoration of church vaults, humid areas, swimming pools, exterior façades and internal plasters (including lath and plaster with or without insulation, architectural features, water park ornaments and simulated rock formations. Technical Details: Brief Description: Telling Brick Mesh is a lathing consisting of a woven mesh of stainless steel with cruciform studs of fired clay spanning the junctions of the mesh. Composition: Stainless steel thread no in accordance with DIN Tensile Strength: N/mm 2 (before firing) Mesh Size: 20mm x 20mm (approx) Wire Thickness: 0.7mm (before firing) Edge Wire Thickness: 0.9mm Clay: High quality rich surface clay: Fired at 850 o C Area: 6m x 1.05m 6m 2 (approx) Thickness: 7mm (clay nodule) Impact Resistance: 36N/mm 2 Delivery: 18 rolls/ pallet Storage: Dry conditions Fire classification: Non-flammable (Class A1 DIN 4102) Consult Telling technical service department for advice on the suitability of the substrate. Consult with Unilit technical literature for details. Hydraulic lime mortars are specialist products and it is recommended that Telling Lime Products are consulted early in the design process. Product reference: Telling Brick Mesh. Material: Expanded Stainless steel mesh coated with nodules of clay. Accessories: Stainless steel fixings should be used to ensure the secure fixing of the mesh to the substrate.

13 nilit +Brick Mesh to Vaulted Areas of Cavity Membrane UNDERCOATS LIGHTWEIGHT LIME RENDER TO BRICK MESH Unilit 25 A dry, premixed lightweight mortar based on expanded volcanic mineral deposits of varying granular sizes and natural hydraulic lime which has excellent vapour permeability qualities to promote the migration of moisture and humidity from with the structure..undercoats: Premixed natural hydraulic lime mortar. Product reference: Unilit 25. Fibre reinforcement: Seek advice from Telling. Not Required Thickness (excluding dubbing out): mm. For application over lath or mesh: 1 x 10 15mm pricking up layer + 1 x 10mm levelling layer. Application: Mix Unilit 25 with clean water - 6 to 7 litres of water to 30 kg of powder depending on the temperature and substrate. Mix mechanically either by a concrete mixer or a paddle whisk for 3 to 5 minutes. Apply manually or mechanically to a dry or wet substrate. If the substrate is too dry, or extreme drying conditions exist, dampen down the surface prior to application. Do not apply in temperatures below 5 C or above 40 C. The mortar remains workable for 2 hours and dries in hours. Protect from frost for 48 to 72 hours. Do not use mortar below ground level. Final coat: Premixed natural hydraulic lime finishing mortar. Product reference: Unilit 45. Thickness: 3-4 mm overall. INTERNAL SELF COLOURED FINISH FOR PAINT APPLICATION Unilit 45 Final coat: Premixed natural hydraulic lime finishing mortar. Product reference: Unilit 45 Thickness: 3-4 mm overall. Finish: Seek advice from Telling. Sponged or floated to the desired finish. Application: Mix Unilit 45 with clean water to 5.25 litres of water to 30kg of powder depending on the temperature and substrate. Mix manually or mechanically for 3 to 5 minutes. Apply manually or mechanically to a dry or damp substrate in 2 layers of 2mm (wet on wet). If the substrate is too dry, dampen down the surface prior to overcoating. Do not apply in temperatures below 5 C or above 40 C. The mortar remains workable for 2 hours and dries in hours. Protect from frost for 48 to 72 hours.

14 Unilit +Brick Mesh to Vaulted Areas of Cavity Membrane Brick Mesh Unilit Lime Plaster products Application: Cavity Membrane, Brick mesh Unilit 25 Lightweight Undercoat Unilit 25 is a lightweight pre-blended lime render Suitable for application Brick Mesh when applied over Cavity membrane. Unilit Fen-XA & Sand Site-mix Fen-XA is suitable for application as a site-mix under coat render when added 1-3 with a sharp well graded washed sand. Unilit 35N Undercoat render Unilit 35 is a pre-blended traditional lime render Suitable for application Cavity Membrane when applied over Unilit K2 Basecoat. Unilit 45 Finish Plaster Unilit 45 or Unilit 47 are both suitable for application over Unilit 25 or Unilit 35N or Site-mixed Fen-XA Undercoat renders..

15 Unilit Lime Plaster over Brick Mesh & Cavity Membrane Waterproof Cavity Drain Membrane with no mesh fixed with sealed plugs Brick Mesh fixed with screw and washed to waterproof plugs Site-mixed Fen-XA NHL5 & approved sand site-mix Or Pre-blended Telling Coarse or Unilit 25 levelling and floating coats Telling Fine, Unilit 45 or Unilit 47 finish coats

16 Brick Mesh Brick Mesh Mesh reinforcement is an option for deteriorated backgrounds. Telling supply Brick Mesh, as stainless steel wire coated with nodules of clay to ensure fusion of lime to the natural mineral. Brick Mesh is well suited to applications over Cavity Membrane to under street Vaults and other difficult backgrounds.. With Brick Mesh it is also possible Mould or pre-shape the mesh to match existing profiles before running the plaster to form cornices, bands etc., is a cost effective method of use.

17 The UNILIT range of natural hydraulic lime mortars have been successfully promoted in the UK by Telling Lime Products for more than 20 years and are wholly compatible for application over the insulation mediums and linings above. Their qualities in vapour permeability, adhesion and low thermal gain ensure have been tested in performance to ensure that the evacuation of interstitial condensation as a vapour can occur with detriment to the mortar or mineral paint decoration. Unilit Natural hydraulic lime enables the render to be applied to create traditional Stucco/ without synthetic textured effect or colouring. Traditional render features of ashlar grooves and struck joints can be formed.