Restoration and decoration
ReturnRepointing stones
Structures:
Prompt natural cement can be used in a mortar, in a mix with lime, to point stones. This also applies near the sea for protection or supporting walls.
Areas of use:
Old buildings, decoration, landscaping, sanitation, sea environments, etc.
Benefits of using Prompt natural cement:
The light ochre colour and permeance qualities make Prompt natural cement a good choice for this use (mixed with lime), in particular in cold and/or wet weather, and where there is a risk of bad weather. With Prompt natural cement, even when – as if often the case – thick applications of product are necessary for large repointing surfaces, cracking does not occur with shrinkage.
Doses and preparation:
The most suitable natural lime–Prompt natural cement mortars are those with the two lowest dosing levels: lean mix mortar and medium mix mortar. Comply with the rules defined in DTU 20-1 Manual for use or use a projection.
| NHL lime | PNC | Sand |
Open time at 20°C |
||
|
Lean mix mortar Overall dose 280 kg/m3 |
in vol. | 4 | 1 | 15 | 25 mn |
| in weight | 320 kg | 100 kg | 25 mn | ||
|
Medium mix mortar Overall dose 340 kg/m3 |
in vol. | 3 | 1 | 10 | 20 mn |
| in weight | 240 kg | 100 kg | 20 mn | ||
|
Fat mix mortar Overall dose 360 kg/m3 |
in vol. | 2 | 2 | 10 | 15 mn |
| in weight | 160 kg | 200 kg | 15 mn |
NB (Prompt natural cement only mortars):
In certain cases, for the purposes of speed or colour, or for minor works, Prompt natural cement-only mortar (with delayed setting using Tempo) can be used. Use a moderate or low dose so as to maintain porosity, which allows gas transfer.
Doses for information (in volumes):
| PNC | Sand | |
| Hard stone/moderate dose | 1 | 2 |
| Soft stone/low dose | 1 | 3 |
