Special Precautions

Common to all masonry and rendering mortars

Conditions of Use

Operating Temperatures:

From 8° to 30°C: for natural lime and façade mortars.
From 5° to 30°C: for formulated limes and other technical mortars.

Substrate Preparation

The surfaces must be clean and sound. In areas where there is permanent humidity (tidal zones), restricting oneself to repointing is preferable.
Moisten surfaces the day before and the day of application. It may be necessary to protect all exposed façades.
On smooth, non-absorbent substrates, a cement resin must be added to the lime mortar. A micro-adhesion mortar can also be applied. If this is not possible, apply a roughcast with admixture.

Choice of Sand:

Sands used for rendering or mortar must meet certain characteristics defined below: :

Be washed and clean (NF DTU 26.1 P1-2) and contain no fines of less than 80 microns.
Have a well-graded granulometry of 0/1 mm or 0/2 mm for float finish, 0/4 mm for base coats and other finishes.

Protection of Finished Plaster Coatings:

Once the rendering is complete, dampen it to improve setting. For very hot weather or strong winds, we advise you to keep the finished coatings fresh by spraying them moderately for 48 hours after application. These renderings will need to be damp by nightfall (façades may need to be tarpaulin-covered).

Roller Shutter Casings

If rendering is applied to roller shutter casings, these must be prepared in line with their Technical Approval.

Tile Sealing:

When using lime mortar and/or lime/cement mortar to seal tiles, it may be necessary to incorporate a cement resin into the mortar, as the tiles may be heavily water-repellent.

Please Note :

The choice of sand is crucial to the uniformity of the colour and appearance of the rendering. The sand required to build the structure should be stored in one go.

Lime is a caustic product when used as fresh mortar for whitewash. Take care to protect metal surfaces (zinc, aluminium, etc.) while it dries and carbonates.