- Practical advice
- Watch out for infiltrations
- Change broken tiles
- Stitch mortar and support surface to the pointerolle
- Paste the edge of the break
- Cut out the back rib
- Apply a wet mortar
- Nest the tiles and align the border
- Pack and fill
- Press and let the mortar rest
The fence walls are covered with tiles whose sealing deteriorates over time. To prevent one day the wall collapses, it is better to intervene as soon as the first disorders appear.
To prepare sealing mortar, do not use pure cement as a binder. Too rich, it is cracking. Prefer a specific mix less hard after drying but much more flexible to work.
A porous tile can be treated with a special colorless varnish (Dip...) that makes it waterproof without changing its appearance.
Between the adjoining gardens, the old fence walls are often built of local stone: rubble stones that are not regularly assembled with lime mortar. To protect them from bad weather, they are covered with tiles in two ways. Some have a row to a slope. Others, as in our example, have an inclined double row on each side of the wall. In this case, the tiles nested in a single joint are capped with a row of ridge sealed mortar.
● It is the slope orientation (right or left) that indicates which owner owns the wall. Except in special cases, a two-slope overlap indicates a common wall.
Watch out for infiltrations
The recovery has a dual function. It ensures the aesthetics of the construction and protects the wall. But over time, frosts and ground movements crack the joints and break the tiles. The infiltrated water throats the wall of moisture and "swells" its flanks. The coating blisters, splits. Little by little, the wall collapses (because of some broken tiles that have not been replaced in time...).
● In the case of a party wall, if you maintain your "side" but the negligence of your neighbor leads to the collapse of the wall, know that both must participate in its reconstruction.
Change broken tiles
To restore a damaged tile, there are two solutions.
● If the tile is frankly broken, it can be repaired with an epoxy adhesive (type "Araldite" Bostik). Mixed well, resin and hardener are applied on the two cracked edges, assembled and held with a clamp for one hour.
● Another solution: replace the deteriorated tile with a similar model, even identical. In our example, single-joint flat tiles, called "small molds", are no longer manufactured. The replacements had to be recovered.
● Once the broken tiles have been removed, remove some of the mortar from the chisel that seals the ridge to slip the new tiles. To facilitate their interlocking, the rear rib is removed by the chainsaw.
● When a series of several tiles is to be replaced, a chevron is fixed to the wall by pegs and blocked under the row to be repaired. It provides support during sealing and allows alignment.
● Sealing and grouting is carried out with a prepared mortar: one part masonry cement ("Multibat" from Lafarge or Calcia cements) and two and a half parts fine sand. The amount of water to be added must give the mortar a smooth consistency.
Stitch mortar and support surface to the pointerolle
Stitch the mortar under the ridge on the chisel without removing them. Also stitch the support surface of the removed tiles for better adhesion of the mortar.
Under the row to be changed, put a piece of chevron on the wall. It will support the new tiles and facilitate their alignment. The broken tile (on the right) can be glued.
Paste the edge of the break
With the double syringe, pour a dose of glue into a plastic box, then mix. Apply it with a spatula on the edge of the break, adjust the seal and tighten.
Cut out the back rib
Cut out the rear rib with a chain saw equipped with a 230 mm diamond disc: the tile will slide better under the ridge caps. A fall of wood maintains it.
Apply a wet mortar
To facilitate the attachment on the quilted part to the chisel, apply a mortar well wet with a trowel. The mortar is made from fine sand and a masonry cement.
Nest the tiles and align the border
After soaking for five minutes in a bucket of water, the tiles are nested one inside the other by sliding their base in the recess practiced under the ridge caps. Align the border.
Pack and fill
Tamp the tiles on their bed of mortar (using a trowel for example). The space between the row and the edge of the ridge is filled with lime mortar.
Press and let the mortar rest
Pressed with the tongue-of-cat trowel, the mortar rests a few hours before being finished with a soft brush. The renovated coronation can last for many years...