FACADE 400 – FACADE 400 HARL – FACADE 400 CR
Specification and Application Guidelines
Facade 400: Cement Free One Coat Render for masonry backgrounds and Façade 400 CR. (Chimney Render).
One Coat Render
Definition of one coat render
One coat renders are principally used to protect external surfaces from water penetration and provide a unifying decorative finish to masonry units.
One coat means that the materials are applied as a single coat either in one pass or in multiple passes / generally wet on wet.
They can be used internally.
Suitable Backgrounds:
Masonry backgrounds – Existing or New construction.
New Build
Brick, Concrete Block, Cast Masonry Units, In Situ Cast Concrete
One coat applied to desired thickness over flush jointed units not less than 100mm finished thickness
Lightweight Block, Flush jointed masonry
Fired Clay Masonry Units including Brick and Mega Brick
Restoration and Repair
Stone and Brick – Dubbing out filling minor irregularities with first pass advisable
Stone and Brick- Fill missing joints in stone and brick in dubbing out pass
Metal Lath – With base coat render support
Masons Mortar Mesh Coat
For Chimneys constructed in all of the suitable background types use Façade 400 CR
Unsuitable Backgrounds and Specifically Excluded Backgrounds.
Gypsum
Wooden boards
Lath (wooden)
Adobe – Cob,
Frozen masonry units
Over saturated backgrounds
Waterproofed (unless an adequate key has been provided)
Water Repellent coated masonry (Unless MM Wall Bond is Specified)
Pre cast units with presence of de-moulding
oils
Paint, (when Stable and MM Wall Bond has ben specified)
Surfaces where the angle of incline is less than 20 degrees (for exclusion of water)
Background preparation:
Suitable backgrounds should be:
Clean and free from deleterious materials, efflorescence, dust, mould oils, lichen or other organic growth.
Adequately dampened to control suction
Sufficiently straight to ensure a consistent thickness of application.
Joints in Masonry Units are filled flush and properly cured (not protruding)
Can be applied with a dubbing out first pass
Adequate drying / curing of masonry units has been allowed (Generally 1 month for initial drying shrinkage on new concrete block work) Keep Chimney render covered with hessian whilst it cures, dampen occasionally for the first few days, this speeds up the curing process.
Metal Lath (mesh), use MMLC (Lath Coat):
See Masons Mortar Ltd Render on Metal Lath Guide) apply at not less than 8mm over mesh, including laps. Do not exceed maximum 5.5 metre spacing for vertical joints and keep mesh panels at not more than 25M2 between moment joints. Metal lath with two sheets of building paper behind to form free draining cavity – fixed in accordance with manufacturers recommendations.
i.e. Expamet 95S Lathing Stainless Steel 1.05 KGs per M2 Fixed staggered fixings (Diamond pattern) max 450 centers horizontal and 450 centers vertically ensure mesh is spaced off background.
10mm x 10mm metal lath fixed over two sheets of building paper with stand off spacer fixings provides the optimum mesh background over sheathing boards.
Application method:
Manual, hand application
Pneumatic hopper gun
Continuous pump (stator)
Continuous pump (plaster sprayer, low pressure)
Mixing: (Mixing regimes should be consistent)
Use clean potable water
Use full bags
Mix for min 3 minutes, whisk and Paddle max 4 minutes Mix for 4-6 minutes with a free fall mixer
Keep water content consistent 4.5-5.5 litres per full bag (water content will vary with pigmentation levels)
Thickness:
Min – 10mm (finished) over MM Wall Bond
Minimum 12mm over flush jointed Masonry
Max – 40mm (in multiple passes wet on wet)
Recommended 18mm scratched to 15mm minimum to hide joints (12mm if stipple coat is applied)
Application Procedure:
Apply to clean background,
Dub out – fill any hollows in first pass.
Apply straightening coat to not less than 12mm over high spots –
Over dubbing out in not more than 4-6 hours
Rule to flat with serrated straight edge
Skim to flat finish with spatula
Finishing Procedure: Façade 400 Harl / Texture mortar with additional aggregates
Harl / Finish
Apply a textured finish either hand cast or sprayed on to spatula finished wall whilst still green, not less than 2 hours not more than 6 hours
Finish will match previously approved samples
Protect all other surfaces from over cast / spray
Remove from glass immediately
Façade 400 Harl may be applied wet on wet over Façade 400 CR – or within 2-4 hours depending on conditions
Flat scraped finish. (All Facade 400 products)
Upon initial set, using a scratch float, remove minor high spots (weather dependent 4-8 hours)
Scratch back to uniform surface free from visible changes in plane
Repair any minor damage with freshly scraped materials.
Hazardous substances classification
- R 38: Irritating to the skin
- R 41: Risk of serious damage to the eyes
- S 2: Keep out of reach of children
- S22: Do not breathe dust
- S24/25: Avoid contact with skin and eyes
- S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice
- S37/39: Wear suitable gloves and eye / face protection
- S46: If swallowed, seek medical advice immediately and show this container or label
Transport Hazard Class
N/A
Disposal
EC waste code no 170101
Any residue must be emptied out of bags or containers before recycling.
Solidify any residual material with water and after consulting the relevant authorities, dispose of in a construction material land fill site.
Performance
Physical and mechanical performance will vary with the mortar chosen, three ranges are available and all performance is dependent on the method of placing typical performance can be expected as follows.
- Compressive strength range 2-5 N/mm2
- Vapour Permeability 0.75g x m2 x h x mmHg
- Modulus of Elasticity 5,000 – 9,000 MPa
- Capillarity 0.6 – 0.7 g/min
- Dry density 1.3-1.5 g/ml
- Water retention 81% +/-3%