Escollera rock walls in Pizarra

MURES builds escollera walls in Pizarra: we are a Málaga company specialising in natural stone retaining walls, excavation and earthworks. We handle everything: site visit, fixed written quote, stone supply, excavation, placement with a digger and drainage. It’s a very common job in Pizarra because of its citrus groves, olive-covered hills and many streams.

Before hiring anyone for escollera walls in Pizarra, check four things: that they give you a fixed written quote, that they state the stone size they’ll use (in kilos per block), that they include drainage behind the wall (drain pipe, gravel and geotextile) and that they have their own or trusted machinery to place the blocks one by one. Ask for photos of similar jobs and who handles the permits. Be wary of very low prices with no drainage or foundations.

There is no fixed price: an escollera wall in Pizarra is quoted according to its length, height, the stone size needed, access for lorries and machinery and the type of ground. In Pizarra the price goes up on stream banks, because the foundations are deeper and the stone is bigger. We give you an exact written quote after visiting the finca, with no obligation.

It depends on the wall. For homeowners we usually quote per m² of visible wall face, because it is the easiest figure to understand and compare; if you prefer, we can also break down the cubic metres of stone and the tonnage. For very tall or thick walls it makes more sense to calculate per m³. Either way, the price of escollera walls in Pizarra depends mainly on the height, the stone size and access, and we give it to you in writing after seeing the plot.

An escollera wall is a retaining wall made of large natural stone blocks (usually 300 to 2,000 kg) placed one by one with machinery, without mortar. It is used to hold back soil on slopes, create terraces, stabilise embankments, protect tracks and reinforce stream banks. It stands up through its own weight and the way the blocks interlock, and it lets water pass between the stones.

Pros: it is very durable, free-draining (no water pressure builds up), copes with small ground movements without cracking, blends into the landscape and is usually quicker and cheaper than a reinforced concrete wall of the same height. Cons: it takes up more space at the base, needs access for a lorry and digger, and isn’t the best option for very thin, vertical walls in tight urban spaces.

Hard quarry rock is used, usually limestone or granite, in irregular blocks. In Málaga, limestone is the norm, light grey or beige in colour. The size depends on the height: for walls up to 1.5 m, blocks of 300 to 800 kg; between 1.5 and 3 m, 800 to 2,000 kg; and above that, larger blocks with a technical calculation. Our quotes always state the weight of stone we’ll use.

For walls on fincas and plots up to 2–3 m high, sizing follows practical criteria: a base wider than the top, a lean into the slope and blocks of the right weight. Above 3 m, or if the wall supports a house or a road, a technical stability calculation is needed. A widely used reference in Spain is the Ministry of Transport’s guide to the design and construction of escollera walls on road works. For escollera walls in Pizarra on very steep fincas, two terraces are often better than one very high wall.

A trench is dug below natural ground level (usually 0.5 to 1 m, depending on the wall height and the soil) and the first course is laid in it with the largest blocks, leaning slightly into the slope. In soft ground or next to streams it goes deeper or the base is concreted. Good foundations are what stop the wall being undermined by rain.

Usually, yes. For escollera walls in Pizarra you normally apply for a building licence or submit a declaración responsable to the town hall, depending on the size of the wall and whether the land is urban or rural. If the wall is within 100 m of a stream or river (zona de policía), you also need authorisation from the Junta de Andalucía water authority. We’ll advise you on what to apply for before we start.

Escollera walls in Pizarra of a typical finca size, 15 to 30 m long and around 2 m high, take about 3 to 8 working days: digging the foundations, placing the blocks, drainage and backfill. It takes longer if it rains, if access is difficult (hill tracks; on the river plain access is usually easy) or if we have to wait for permits. We give you an approximate date in the quote.

Very little. Once a year, especially after heavy rain, check that the drain outlet isn’t blocked, that no blocks at the base have moved and that run-off water isn’t falling straight onto the top of the wall. Plants growing between the stones aren’t usually a problem, except for the roots of large trees near the base. A well-built wall can last decades without any work.

In dry-laid escollera the blocks interlock without concrete; it is free-draining, flexible and the most common choice on fincas. In concrete-bedded escollera the gaps are filled with concrete for extra rigidity, and it’s used for very high walls, walls with loads nearby or in fast-flowing watercourses. In Pizarra, for tracks and terraces we usually recommend dry-laid escollera with good drainage; concrete-bedded only when the job requires it.