Old brick or exposed stone facades deteriorate as they age and under the attack of various types of pollution and bad weather. And this especially at the joints which then become vulnerable to water and then to frost. They crumble, letting moisture penetrate the walls. The restoration of these joints allows the facade to fulfill its protective function and also to acquire an aesthetic function not always suspected before being thus revealed and enhanced. Depending on the nature and characteristics of the materials the wall is made of, the most suitable type of mortar should be used and its color determined according to the principles of harmony or contrast.
- Protective gloves
- Watering lance
- Hard nylon brush
- Cleaning and humidifying the facade
- Garnish the joints of the facade with mortar
Cleaning and humidifying the facade
1. Start by probing the wall to remove any non-adherent part and then purge the joints by removing any degraded material on 2 to 5 cm depending on the nature of the support. Brush and clean the facade. In case of sanding, adjust the pressure to the resistance of the siding.
2. Replace deteriorated, missing or poorly sealed items (re-use possible if not damaged) with materials of the same type and, if possible, very similar colors. A specific treatment can make it possible to mineralise the stone (harden it on the surface). But it must be applied under favorable weather conditions at least 14 days before restoration. This one will be done on a support which will have been moistened the day before but will be wiped on the surface.
Garnish the joints of the facade with mortar
1. Refuse the dug joints of bricks to an even thickness of 1 to 3 cm. Tighten the mortar with a trowel, cat's tongue or soldering iron according to the offered convenience and the desired finish with the concern to always facilitate the flow of rain.
2. Brush, cut or smooth the joint (dome, flat or hollow) as work progresses. Clean the siding before curing the mortar with a clean sponge and barely moistened. Cleaning with acidulated water (dilute hydrochloric acid) can complete the operation after complete hardening of the mortar. In this case, rinse thoroughly with clear water.
3. The grouting of irregular stones requires the use of various trowels according to the width of the joint to be erected. Choose the type of mortar according to the appearance you want to give to the joint as well as its color, in harmony or contrast with the facing.
4. Allow to dry for a few hours (check according to temperature) then scrape the mortar with a cat's tongue in order to leave the facing, a relief of 2 to 3 mm to emphasize it. Brush (scrub brush or hard nylon), scrape (soft wire brush) or float the seal to the desired final appearance. Be sure to clean the siding with a slightly dampened sponge or if the mortar is dry, with acidulated water (dilute hydrochloric acid). In this case, rinse with clean water.
(photos / visuals: © Parexlanko, except special mention)
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