St Astier Ecomortar Finishing - F Grade
This is an excellent range of pre-mixed natural hydraulic limes designed to provide all the benefits of traditional lime mortars/plasters in all sectors of today's building industry. Included here is the R Series with which it is possible to go over surfaces that normally require a multitude of coats or treatments.
Estimate how much you will need by using our calculator!

Collection
Next Day Pallet
Economy Pallet
Parcel Delivery
St Astier Ecomortars F Grade (for finishing) This is an excellent pre-mixed natural hydraulic lime designed to provide all the benefits of traditional lime mortars/plasters in all sectors of today's building industry. EcoMorter contains a natural water retainer and air entrainer to improve the curing process, reducing the effects of moisture loss and aiding workability.
To see an example of this product in use, see our case study of Achabeag, Western Highland of Scotland
MIXING
- Mix for 4 to 5 minutes with a whisk mixer (450 to 500 rpm).
- High-speed mixers (more than 500 rpm) are not recommended as they can over-mix the product and modify its performance.
- Manual mixing is not recommended.
WATER ADDITION
- Granulometry TF : 4 to 4,5 litres per 25 kg bag.
- TF : 0-1,3mm (80 % passing sieve 0,8 mm)
WORKING TEMPERATURE
Not below 8°C or above 30°C. Dampen the substrates the day before and prior to application, allow the surface water to be reabsorbed. Avoid rapid drying due to high temperatures and/ or strong winds by covering and curing with a light water mist as necessary. Protect wet mortars from frost for at least 10 days after application. Reseal open bags as soon as possible.
PREPARATION OF THE SUBSTRATE
- The substrate must be in good condition, clean and dust free.
- On existing renders, all paint, organic material and synthetic skins must be removed and any cracks and/or hollow spaces should be treated.
- Soluble salts should also be treated before the finishing coat is applied. Allow sufficient drying time for any repairs made.
- Dampen the wall the day before.
- Check on the day of application whether the substrate is still sufficiently damp and, if necessary, dampen one hour before application.
- The substrate must be level but sufficiently rough to ensure good adhesion.
APPLICATION
- Manually with trowel
- Mechanically with a render gun
POSSIBLE FINISHES
Scratched finish
- Apply a layer of 12 to 15 mm, lay flat and allow to cure for 2 to 6 hours (drying time may vary depending on absorption, thickness, finish and weather conditions). Scratch with a pin float (devil float), once it’s dry and brush with a soft brush.
Floated finish
- Apply a layer of 10 mm, smooth and level and allow to cure for 2 to 4 hours. Float with a wood/plastic/sponge float. Once dry, brush with a soft brush if necessary.
Smooth finish
- Apply a layer of 5 to 8 mm maximum, level and allow to set for 2 to 4 hours depending on weather conditions.
- Scratch with a pin float ( devil float)
- Immediately trowel with a damp sponge trowel, applying light pressure, this will leave a layer of «milk of lime».
- Then immediately pass an iron float
- NOTE: The finished appearance of the same colour reference is lighter with a smooth finish than with a rough finish.
Suitable For
- External Top Coat for
- St. Astier Ecomorar Base (C)
- St. Astier NHL Render
Coverage Rate
- 1.6m2 at 10mm per 25kg Bag
- Vapour permeable
- High Elasticity
- Designed for traditional masonry
25kg Bags