What is the difference between NHL 3.5 and NHL 5?

What is the difference between NHL 3.5 and NHL 5?

NHL 2 and NHL 3.5 are frequently used for internal, as well as external works. NHL 5 is generally used for external works in exposed and more extreme conditions but is less ‘breathable’ and much less flexible.

How long does NHL lime last?

4-12 months
Hydraulic lime mortars have a shelf life and should be stored dry and sealed from the atmosphere to prolong its life. If stored correctly, the bags of dry powder could last anything from 4-12 months from manufacture.

What is NHL plaster?

Saint-AstierĀ® Natural Hydraulic Lime (NHL) is an industry-standard used for historic restoration mortar, stucco, and Plaster with no harmful portland cement present or required. Saint-AstierĀ® NHL is pure and natural, free of additives, and has been in use throughout the world for over 150 years.

How long does lime render last?

Limewash is the most traditional paint to apply but is not particularly durable and will require repainting every 3-7 years on average.

How do you use NHL 3.5 lime?

To avoid ‘balling’ of the mortar whilst using a drum mixer, we recommend the following method:

  1. To an empty mixer, add half of the required sand amount and switch on.
  2. Next add all of the NHL lime and allow to turn over a few times.
  3. Add the remaining sand.
  4. Turn over for 5 minutes until fully mixed.

Is NHL the same as hydrated lime?

Non-hydraulic lime (CL or DL 70-90) is sold as either hydrated lime or putty lime; they set and harden through drying out and absorbing carbon dioxide from the air. This means they have a very slow set: CO2 is only absorbed when certain conditions are met. They are the softest, most breathable limes available.

Is there an alternative to lime plaster?

Cement render is usually a cheaper alternative to Lime or Polymer renders. The rigidity of cement render usually limits it’s application to older buildings, where flexibility of finish is usually required to overcome structural movement.

Why does lime plaster crack?

In carbonation of lime can only take place in the presence of water. It can years for a new plaster/render to reach its full strength. If plaster/render dries before sufficient carbonation has taken place then cracking can occur.

How long should lime pointing be covered?

If at all possible protect your pointed walls with dampened burlap raised 1-2 inches away from the wall for a period of at least 3-5 days. Keep the burlap damp by misting it with water periodically.

How long does lime plaster take to cure?

In most circumstances it will need two weeks to dry out, but can take up to four weeks in some cases. Shrinkage cracks are likely to appear as it dries, but this is not a problem. The important thing is to avoid it drying too rapidly, which can cause it to fail.

How do you seal lime plaster?

Wax is the most natural looking sealer and the most commonly used on polished lime plasters. They give added sheen and dirt rejection. Repel retains the natural matt finish of most plasters and renders and gives water repellency. It is more commonly used on clay plasters, as clay is naturally very water absorbent.

Is lime plastering expensive?

Is Lime Plaster Expensive? It is generally more expensive to plaster your house using lime plaster than with cement or gypsum plaster. There are a couple of reasons for this.